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Organic cathodes are considered promising energy storage materials in potassium ion batteries (KIBs) due to their molecular flexibility, cost‐effectiveness, and sustainability. However, challenges such as high solubility and slow reaction kinetics hinder the development of organic molecules for KIBs. Herein, a novel in situ self‐assembly strategy is presented to construct a robust hydrogen‐bonded organic framework cathode (H‐NDA‐G) with extensive π‐conjugated systems and excellent chemical stability. By selecting 2,4‐diaminotriazine as the connecting ligand, which serves both as a hydrogen bond donor and acceptor, the H‐NDA‐G cathode is constructed utilizing its amide reaction with dianhydride and the strong π–π adsorption interactions with graphene oxide (GO). The weak electronic coupling between H‐NDA‐G not only provides charge transfer channels within the framework but also forms an interconnected conductive network through hydrogen bonding and π–π adsorption with the GO, facilitating the redox reactions of K+ within the H‐NDA‐G electrode. Consequently, the H‐NDA‐G cathode exhibits extraordinary performance with a high capacity (120 mAh g−1 at 0.1 A g−1) and cycle life exceeding 1000 cycles at 1 A g−1, demonstrating significant potential for practical applications. This study underscores the potential to enhance the potassium storage capability of organic cathodes by modulating intermolecular forces toward efficient and sustainable KIBs. [ABSTRACT FROM AUTHOR]

Niobium oxides are potential anode materials for ultrafast and safe lithium‐ion batteries due to their high ionic conductivity and relatively high operation voltage. However, the electrochemically induced phase transformations that involve multi‐electron redox reactions in a wide voltage window cause rapid capacity degradation and poor rate capability. Here, a novel carbon‐covalent amorphous niobium oxide anode is reported to greatly suppress the phase transition during cycling via formation of strong Nb─O─C bonds, achieving high‐capacity, fast‐charge and long‐duration lithium storage. This amorphous structure and forming covalent carbon contribute to good volume accommodation and high electron conductivity. The carbon‐covalent amorphous Nb2O5 displays a high reversible capacity of 361.5 mAh g−1 at 0.1 A g−1 and excellent cycling stability with a capacity of 189.8 mAh g−1 at a high rate of 10 A g−1 after 9000 cycles. Structure characterizations reveal that the well‐preserved amorphous structure without phase transition during repeated Li+ insertion/desertion is responsible for the superior performance. This work opens a new avenue on rational design of high‐performance amorphous electrode materials for next‐generation batteries. [ABSTRACT FROM AUTHOR]

The development of an artificial solid‐electrolyte interphase (SEI) has been recognized as the most efficient strategy to overcome the safety concerns associated with the lithium metal anode (LMA). Inorganic‐rich SEIs on the LMA are crucial for suppressing Li dendrites. Among the prevalent SEI inorganic compounds observed for LMA, lithium nitride (Li3N) is often found in the SEIs of high‐performance LMA. Herein, the Li3N nanowire array is successfully synthesized and the catalytic base‐growth mechanism is thoroughly investigated. The fast ionic conductor Li3N nanowires act as pillars to control the nucleation and growth of lithium metal along the vertical direction of the nanowire by bottom‐up self‐lubrication, which fundamentally prevents the dendrite growth. The Li3N is characterized by abundant lithiophilic nucleation sites, which effectively reduces the local current density, and facilitates homogeneous Li+ flux. Symmetric cells utilizing the Li3N@Li anode have demonstrated excellent stability, featuring uniform deposition without dendrite formation. Additionally, high‐capacity retentions of 98% at 0.5 C after 400 cycles and impressive high‐rate performance at 31.1 mA cm−2 have been realized in high‐loading Li3N@Li||LFP cells. The universal preparation of the Li3N nanowires with various precursors and substrates is further explored, which is expected to be applied in solid‐state batteries and hydrogen storage. [ABSTRACT FROM AUTHOR]

The practical application of hard carbon in sodium‐ion batteries is limited by insufficient reversible capacity and low initial Coulombic efficiency (ICE), which are caused by the lack of active sites and unstable electrode/electrolyte interface. Herein, a biomass‐derived hard carbon material based on tea stems is proposed, which exhibits an ultrahigh ICE of 90.8%. This remarkable ICE is attributed to the presence of an inorganic‐rich, thin, and robust solid electrolyte interface (SEI) layer. Furthermore, the material demonstrates excellent cycling stability, showing a capacity retention of 99.5% after 500 cycles at 280 mA g−1. Additionally, when it works as the anode material in a sodium‐ion full cell without presodiation, it reaches a high energy density of 212 Wh kg−1 and a superior stability, e.g., retaining 93.1 mAh g−1 after 1000 cycles at 1 A g−1 with a capacity retention of 91.3%. The sodium storage capacity of this material is primarily attributed to a combined adsorption‐intercalation/filling effect as confirmed by in situ XRD and ex situ Raman analyses. These findings make this biomass‐derived hard carbon material a promising candidate for commercial application of sodium‐ion batteries, achieving high performance at low cost. [ABSTRACT FROM AUTHOR]

Co‐insertion of protons happens widely and enables divalent‐ion aqueous batteries to achieve high performances. However, detailed investigations and comprehensive understandings of proton co‐insertion are scarce. Herein, we demonstrate that proton co‐insertion into tunnel materials is determined jointly by interface derivation and inner diffusion: at the interface, hdrated Mg2+ has poor insertion kinetics, and therefore accumulates and hydrolyzes to produce protons; in the tunnels, co‐inserted/lattice H2O molecules block the Mg2+ diffusion while facilitate the proton diffusion. When monoclinic vanadium dioxide (VO2(B)) anode is tested in Mg(CH3COO)2 aqueous solution, the formation of Mg‐rich solid electrolyte interphase on the VO2(B) electrode and co‐insertion of derived protons are probed; in the tunnels, the diffusion energy barrier of Mg2++H2O is 2.7 eV, while that of the protons is 0.37 eV. Thus, protons dominate the subsequent insertion and inner diffusion. As a consequence, the VO2(B) achieves a high capacity of 257.0 mAh g−1 at 1 A g−1, a high rate retention of 59.1 % from 1 to 8 A g−1, and stable cyclability of 3000 times with a capacity retention of 81.5 %. This work provides an in‐depth understanding of the proton co‐insertion and may promote the development of rechargeable aqueous batteries. [ABSTRACT FROM AUTHOR]

In terms of high capacity and reliable safety, low‐valent silicon‐based composites with small grain sizes are practicable anode materials for lithium‐ion batteries. However, robust tetravalent silicon precursors make the synthesis hard to be green. Using biosilicification in water hyacinth (Eichhornia crassipes), it is found to be a superior natural precursor of low‐valent silicon. The biogenic sub‐nano (0.5 nm) siliceous dots composite (EC‐SiOC) shows a reversible conversion mechanism between Si─O and C─O bonds, unlike previous lithium storage mechanisms associated with alloying reactions. Due to the homogeneous biogenic structure facilitating the solid‐phase reaction, the normalized energy consumption of pyrolytic EC‐SiOC is about 80% lower than the carbothermic reduction of silica, similar to molten salt electrolysis. Statistically, the sampling survey of EC‐SiOC from different regions shows a high average capacity of 749.9 mAh g−1 under a current density of 100 mA g−1. This study reveals the great potential of biomass precursors for synthesizing Si─O─C materials. [ABSTRACT FROM AUTHOR]

Potassium‐ion batteries (PIBs) have attracted significant research interest in the context of driving the advancement of grid energy storage due to K's elemental abundance and high theoretical output voltage. The main challenge facing PIBs is to find suitable cathode materials with fast transport kinetics and stable framework structures to intercalate/de‐intercalate the large‐size K+. Among these candidates, transition‐metal layered oxides are have excellent potential and have been extensively exploited due to their stable skeleton structure, simple synthetic chemistry, and high working potential. Herein, the current research status and prospects of layered transition‐metal oxide cathodes are summarized, especially focussing on the fine structure optimization engineering and energy storage mechanism. In addition, a brief overview of the research on advanced characterization techniques for PIBs is introduced in detail. Finally, the main research directions and hot spots of new‐type transition‐metal layered oxide cathode are also predicted, in order to guide the future development of advanced PIBs. [ABSTRACT FROM AUTHOR]

Rechargeable aluminum ion batteries (AIBs) are one of the most promising battery technologies for future large‐scale energy storage due to their high theoretical volumetric capacity, low‐cost, and high safety. However, the low capacity of the intercalation‐type cathode materials reduces the competitiveness of AIBs in practical applications. Herein, a conversion‐type FeF3‐expanded graphite (EG) composite is synthesized as a novel cathode material for AIBs with good conductivity and cycle stability. Combined with the introduction of a single‐wall carbon nanotube modified separator, the shuttle effect of the intermediate product, FeCl2, is significantly restrained. Moreover, enhanced coulombic efficiency and reversible capacity are achieved. The AIB exhibits a satisfying reversible specific capacity of 266 mAh g−1 at 60 mA g−1 after 200 cycles, and good Coulombic efficiency of nearly 100% after 400 cycles at a current density of 100 mA g−1. Ex situ X‐ray diffraction and X‐ray photoelectron spectroscopy are applied to explore the energy storage mechanism of FeF3 in AIBs. The results reveal that the intercalation of Al3+ species and the reduction of Fe3+ species occurrs in the discharge process. These findings are meaningful for the fundamental understanding of the FeF3 cathode for AIBs and provide unprecedented insight into novel conversion type cathode materials for AIBs. [ABSTRACT FROM AUTHOR]

Zinc‐ion batteries (ZIB) present great potential in energy storage due to low cost and high safety. However, the poor stability, dendrite growth, and narrow electrochemical window limit their practical application. Herein, we develop a new eutectic electrolyte consisting of ethylene glycol (EG) and ZnCl2 for dendrite‐free and long‐lifespan ZIBs. The EG molecules participate in the Zn2+ solvation via coordination and hydrogen‐bond interactions. Optimizing the ZnCl2/EG molar ratio (1 : 4) can strengthen intermolecular interactions to form [ZnCl(EG)]+ and [ZnCl(EG)2]+ cations. The dissociation–reduction of these complex cations enables the formation of a Cl‐rich organic–inorganic hybrid solid electrolyte interphase film on a Zn anode, realizing highly reversible Zn plating/stripping with long‐term stability of ≈3200 h. Furthermore, the polyaniline||Zn cell manifests decent cycling performance with ≈78 % capacity retention after 10 000 cycles, and the assembled pouch cell demonstrates high safety and stable capacity. This work opens an avenue for developing eutectic electrolytes for high‐safety and practical ZIBs. [ABSTRACT FROM AUTHOR]

Mn‐based layered oxides are one of the most appealing cathodes for potassium‐ion batteries (PIBs) because of their high theoretical capacity. However, the Jahn–Teller effect of Mn3+ induces detrimental structural disorder and irreversible phase transition, leading to inferior cycling stability. Herein, an efficient strategy to suppress the Jahn–Teller effect in Mn‐based layered oxides by regulating the Mn average valence is demonstrated. To verify this strategy, Ti4+ and Mg2+ ions are chosen and introduced into the layered oxides (K0.5Mn0.7Co0.2Fe0.1O2), which can enhance the structural stability but have opposite effects on the regulation of Mn3+/4+ valence. The K0.5Mn0.6Co0.2Fe0.1Mg0.1O2 with a higher Mn valence (4+) exhibits long‐term cycling stability as a PIB cathode compared to the K0.5Mn0.6Co0.2Fe0.1Ti0.1O2 with a lower Mn valence (3.667+). Meanwhile, the detrimental phase transition from P3 to O3 caused by Jahn–Teller effect is completely suppressed, and is replaced by a highly reversible single‐phase solid solution reaction for K0.5Mn0.6Co0.2Fe0.1Mg0.1O2. The enhanced cycling stability and single‐phase reaction are attributed to the suppressed Jahn–Teller effect via Mn valence regulation, confirmed by first‐principles calculations. Therefore, this discovery paves the way for the development of advanced layered cathodes for the next‐generation high‐performance PIBs. [ABSTRACT FROM AUTHOR]

Rechargeable zinc‐air batteries (RZABs) are one of the most promising next‐generation energy‐storage technologies for stationary applications (home and industry), wearable and portable electronics, and transportation (including electric vehicles) due to their high energy density, environmental friendliness, safety, and low cost. However, RZABs still face serious challenges (such as sluggish oxygen reactions, poor durability, inferior reversibility of the zinc anode, and low cell energy efficiency) that conspire against their widespread commercialization. The reactions that occur at the three key components of the RZAB (air cathode, zinc anode, and electrolyte) co‐operatively conspire against its performance. Thus, this review focuses on the bifunctional electrocatalytic events at the cathode (i. e., oxygen reduction reaction (ORR) and oxygen evolution reaction (OER)). That is in addition to the recent developments aimed at mitigating the performance‐limiting events at the anode and the electrolytes. This review directs the attention of researchers and users to the critical areas for the development of the next‐generation RZABs. [ABSTRACT FROM AUTHOR]

The coordination compounds in the oxygen evolution reaction (OER) have been researched extensively. However, their poor durability (mostly < 100 h) and controversial reconstruction mechanism restrict their practical applications. Herein, a new‐type polyoxomolybdate‐organic complex (POMo) via wet‐chemistry synthesis with fixed coordination between metal centers (Ni2+ and [Mo8O26]4−) and 2‐Methylimidazole ligand is introduced. After introducing iron, a series of Fe‐doped Ni‐POMo with porous and amorphous structures are fabricated. These features accelerate the diffusion‐leaching processes of ligands and anions, resulting in rapid and complete phase reconstruction during alkaline OER. As a result, nickel‐iron (oxy)hydroxides with rich vacancies and poly‐/low‐crystalline features are in situ generated through dissolution‐redeposition, and serve as the OER‐active species. The optimized Fe0.052Ni‐POMo array pre‐catalyst has excellent activity and sustains ultrastable catalysis for 545 h. The complete reconstruction of POMo enables high catalytic durability (230 h) and stable active phase under realistic conditions (30 wt% KOH, 60.9 °C). Accordingly, the completely reconstructed catalysts with unique structures and ultrastable catalysis have the potential to be applied in industry. [ABSTRACT FROM AUTHOR]

Even though lithium ion batteries (LIBs) have seen extensive applications during the past 20 years, the anode materials which have realized commercialization are mainly restricted to graphite and Li4Ti5O12. However, because of the limited capacity of these two intercalation‐type anodes, they cannot meet the higher requirements in energy density of some applications. Very few types of high‐capacity anode materials have been successfully commercialized, mainly due to the inevitable large volume change during lithium insertion/extraction. Herein, a promising anode material, CaV4O9, which shows both high gravimetric capacity of more than 600 mAh g–1 with a safe average discharge potential of about 0.8 V, and near‐zero volume change character like Li4Ti5O12, is identified. The specific lithium storage mechanism and the origin of near‐zero volume change character are revealed. Considering the superior performance endowed by these unique intrinsic properties, CaV4O9 shows great potential for commercialized anode material and may promote innovation in LIBs. [ABSTRACT FROM AUTHOR]

Iron phthalocyanine (FePc) has inspired substantial interest in the context of the oxygen reduction reaction (ORR) owing to its prominent catalytic activity in alkaline media; however, its poor stability significantly hinders its practical applications. Heterostructures with a strong coupling effect between different components have considerable potential to promote the activity and stability simultaneously. Hence, a heterostructured bimetallic phthalocyanine (FePc/CoPc HS) catalyst with heterogeneous distribution of metallic elements is designed. Compared with FePc, FePc/CoPc HS demonstrates higher kinetic current density (increased by >100%) and more robust durability (enhanced by 20.5%) for the ORR. In addition, a Zn–air battery with FePc/CoPc HS as the cathode catalyst achieves high power density (128 mW cm−2) and high open‐circuit voltage (1.67 V). X‐ray absorption fine structure and theoretical calculations reveal that the heterostructure design induced elongates the FeN bond length, and augments electron density around the Fe active sites, and reduced highest‐occupied molecular orbital and lowest‐unoccupied molecular orbital energy gap are responsible for the boosted ORR performance. This work enriches the understanding of electronic structure modulation of heterostructured bimetallic phthalocyanine based ORR electrocatalysts. [ABSTRACT FROM AUTHOR]

On‐chip microsupercapacitors (MSC) with facile fabrication procedures, high integration design, and superior performance are desired as an energy storage device for microelectronics. Hence, a novel procedure is proposed to fabricate an asymmetric microsupercapacitor (AMSC), employing interwoven nanowire (NW) network electrodes of poly(3,4‐ethylenedioxythiophene) coated titanium oxynitride (P‐TiON) and vanadium nitride (VN) NW as a cathode and an anode, respectively. The interwoven NWs with a high mass loading offer a sufficient electrochemical reaction area and rapid electron/ion transport pathway, delivering superior energy and power densities. With the LiCl/polyvinyl alcohol electrolyte, the assembled P‐TiON//VN AMSC can achieve a wide voltage window from 0 to 1.8 V with an excellent areal capacitance of 72 mF cm−2, a high areal energy density of 32.4 μWh cm−2 (at 0.9 mW cm−2), an outstanding power density of 45 mW cm−2 (at 21.9 μWh cm−2), and a good cycling performance. Furthermore, the substrate‐free electrodes exhibit outstanding integrability, and the system on one printed circuit board including two AMSCs in series and a LED demonstrates excellent practicability. [ABSTRACT FROM AUTHOR]

VS2 is one of the attractive layered cathodes for alkali metal‐ion batteries. However, the understanding of the detailed reaction processes and energy storage mechanism is still inadequate. Herein, the Li+/Na+/K+ insertion/extraction mechanisms of VS2 cathode are elucidated on the basis of experimental analyses and theoretical simulations. It is found that the insertion/extraction behavior of Li+ is partially irreversible, while the insertion/extraction behavior of Na+/K+ is completely reversible. The detailed intermediates and final products (Li0.33VS2, LiVS2, Na0.5VS2, NaVS2, K0.6VS2, KzVS2, z > 0.6) during the discharging/charging processes are identified, indicating that VS2 undergoes different phase transitions and solid–solution reactions in different battery systems, which have a great influence on the battery performance. Moreover, the diffusion of Na+ in VS2 cathode is demonstrated to be much slower than that of Li+ and K+. Such mechanistic research provides a reference for in‐depth understanding of energy storage in layered transition metal sulfides/selenides. [ABSTRACT FROM AUTHOR]

The emerging electrochemical energy storage systems beyond Li‐ion batteries, including Na/K/Mg/Ca/Zn/Al‐ion batteries, attract extensive interest as the development of Li‐ion batteries is seriously hindered by the scarce lithium resources. During the past years, large amounts of studies have focused on the investigation of various electrode materials toward emerging metal‐ion batteries to realize high energy density, high power density, and a long cycle life. In particular, vanadium‐based nanomaterials have received great attention. Vanadium‐based compounds have a big family with different structures, chemical compositions, and electrochemical properties, which provide huge possibilities for the development of emerging electrochemical energy storage. In this review, a comprehensive overview of the recent progresses of promising vanadium‐based nanomaterials for emerging metal‐ion batteries is presented. The vanadium‐based materials are classified into four groups: vanadium oxides, vanadates, vanadium phosphates, and oxygen‐free vanadium‐based compounds. The structures, electrochemical properties, and modification strategies are discussed. The structure–performance relationships and charge storage mechanisms are focused on. Finally, the perspectives about future directions of vanadium‐based nanomaterials for emerging energy storage devices are proposed. This review will provide comprehensive knowledge of vanadium‐based nanomaterials and shed light on their potential applications in emerging energy storage. [ABSTRACT FROM AUTHOR]

The rational design of flexible electrodes is essential for achieving high performance in flexible and wearable energy‐storage devices, which are highly desired with fast‐growing demands for flexible electronics. Owing to the one‐dimensional structure, nanowires with continuous electron conduction, ion diffusion channels, and good mechanical properties are particularly favorable for obtaining flexible freestanding electrodes that can realize high energy/power density, while retaining long‐term cycling stability under various mechanical deformations. This Minireview focuses on recent advances in the design, fabrication, and application of nanowire‐based flexible freestanding electrodes with diverse compositions, while highlighting the rational design of nanowire‐based materials for high‐performance flexible electrodes. Existing challenges and future opportunities towards a deeper fundamental understanding and practical applications are also presented. Bend and stretch: Nanowires represent very promising candidates for constructing freestanding electrodes with high energy/power densities and excellent flexibility. Recent progress in fabrication methods and design strategies for nanowire‐based, flexible, freestanding electrodes towards high‐performance energy storage is summarized here. [ABSTRACT FROM AUTHOR]

Abstract: Rechargeable aqueous Zn‐based batteries, benefiting from their good reliability, low cost, high energy/power densities, and ecofriendliness, show great potential in energy storage systems. However, the poor cycling performance due to the formation of Zn dendrites greatly hinders their practical applications. In this work, a trilayer 3D CC‐ZnO@C‐Zn anode is obtained by in situ growing ZIFs (zeolitic‐imidazolate frameworks) derived ZnO@C core–shell nanorods on carbon cloth followed by Zn deposition, which exhibits excellent antidendrite performance. Using CC‐ZnO@C‐Zn as the anode and a branch‐like Co(CO3)0.5(OH)x·0.11H2O@CoMoO4 (CC‐CCH@CMO) as the cathode, a Zn–Co battery is rationally designed, displaying excellent energy/power densities (235 Wh kg−1, 12.6 kW kg−1) and remarkable cycling performance (71.1% after 5000 cycles). Impressively, when using a gel electrolyte, a highly customizable, fiber‐shaped flexible all‐solid‐state Zn–Co battery is assembled for the first time, which presents a high energy density of 4.6 mWh cm−3, peak power density of 0.42 W cm−3, and long durability (82% capacity retention after 1600 cycles) as well as excellent flexibility. The unique 3D electrode design in this study provides a novel approach to achieve high‐performance Zn‐based batteries, showing promising applications in flexible and portable energy‐storage systems. [ABSTRACT FROM AUTHOR]

A deep eutectic electrolyte (ZnCl SB 2 sb -4EG) composed of EG and ZnCl SB 2 sb for dendrite-free zinc anodes has been reported in a previous study by Mun and co-workers,[1] which was not cited in our article. Corrigendum: Eutectic Electrolyte with Unique Solvation Structure for High-Performance Zinc-Ion Batteries In this Research Article, we reported a eutectic electrolyte consisting of ethylene glycol (EG) and ZnCl SB 2 sb . [Extracted from the article]

Berichtigung: Eutectic Electrolyte with Unique Solvation Structure for High-Performance Zinc-Ion Batteries In this Research Article, we reported a eutectic electrolyte consisting of ethylene glycol (EG) and ZnCl SB 2 sb . A deep eutectic electrolyte (ZnCl SB 2 sb -4EG) composed of EG and ZnCl SB 2 sb for dendrite-free zinc anodes has been reported in a previous study by Mun and co-workers,[1] which was not cited in our article. [Extracted from the article]

Sodium-ion battery has captured much attention due to the abundant sodium resources and potentially low cost. However, it suffers from poor cycling stability and low diffusion coefficient, which seriously limit its widespread application. Here, K3V2(PO4)3/C bundled nanowires are fabricated usinga facile organic acid-assisted method. With a highly stable framework, nanoporous structure, and conductive carbon coating, the K3V2(PO4)3/C bundled nanowires manifest excellent electrochemical performances in sodium-ion battery. A stable capacity of 119 mAh g−1 can be achieved at 100 mA g−1. Even at a high current density of 2000 mA g−1, 96.0% of the capacity can be retained after 2000 charge-discharge cycles. Comparing with K3V2(PO4)3/C blocks, the K3V2(PO4)3/C bundled nanowires show significantly improved cycling stability. This work provides a facile and effective approach to enhance the electrochemical performance of sodium-ion batteries. [ABSTRACT FROM AUTHOR]

Rechargeable zinc-air battery (RZAB), zinc anode; air electrode, bifunctional electrocatalysts, electrolytes Front Cover: Efforts at Enhancing Bifunctional Electrocatalysis and Related Events for Rechargeable Zinc-Air Batteries (ChemElectroChem 21/2021) Keywords: rechargeable zinc-air battery (RZAB); zinc anode; air electrode; bifunctional electrocatalysts; electrolytes EN rechargeable zinc-air battery (RZAB) zinc anode; air electrode bifunctional electrocatalysts electrolytes 3992 3992 1 11/16/21 20211102 NES 211102 B The Front Cover b illustrates the significance of bifunctional electrocatalysis (ORR/OER) and zinc anode as the key drivers for the development of rechargeable zinc-air batteries that promise to revolutionize electricity storage and applications (represented herein by electric vehicle charging point). [Extracted from the article]

Fast‐charging lithium‐ion batteries are pivotal in overcoming the limitations of energy storage devices, particularly their energy density. There is a burgeoning interest in boosting energy storage performance through enhanced fast‐charging capabilities. However, the challenge lies in developing batteries that combine high rates, long cycle life, high capacity, and safety. This review emphasizes the importance of fundamentals and design principles of fast charging, identifying the transport of ion/electron within the electrodes/electrolytes' bulk phase and at phase boundaries as the crucial rate‐limiting steps for fast charging. Such as ion transport tunnel regulation, interfacial modification, defect engineering and multiphase systems, various optimization strategies improve the stable and exceptional electrochemical reaction kinetics for electrodes. Constructing stable solid electrolyte interfaces and adjusting solvation structures further enhance the Li+ diffusion kinetics of electrolytes. The review critically assesses the impacts and limitations of these strategies, suggesting future research directions and insights for advancing fast‐charging lithium‐ion batteries. It is anticipated that this review will inspire and guide the systematic evolution of fast‐charging technologies. [ABSTRACT FROM AUTHOR]

Rechargeable magnesium batteries (RMBs) are a highly promising energy storage system due to their high volumetric capacity and intrinsic safety. However, the practical development of RMBs is hindered by the sluggish Mg2+ diffusion kinetics, including at the cathode‐electrolyte interface (CEI) and within the cathode bulk. Herein, we propose an efficient strategy to manipulate the interfacial chemistry and coordination structure in oligolayered V2O5 (L−V2O5) for achieving rapid Mg2+ diffusion kinetics. In terms of the interfacial chemistry, the specific exposed crystal planes in L−V2O5 possess strong electron donating ability, which helps to promote the degradation dynamics of C−F/C−S bonds in the electrolyte, thereby establishing the inorganic‐organic interlocking CEI layer for rapid Mg2+ diffusion. In terms of the coordination structure, the straightened V−O structure in L−V2O5 provides efficient ions diffusion path for accelerating Mg2+ diffusion in the cathode. As a result, the L−V2O5 delivers a high reversible capacity (355.3 mA h g−1 at 0.1 A g−1) and an excellent rate capability (161 mAh g−1 at 1 A g−1). Impressively, the interdigital micro‐RMBs is firstly assembled, exhibiting excellent flexibility and practicability. This work gives deeper insights into the interface and interior ions diffusion for developing high‐kinetics RMBs. [ABSTRACT FROM AUTHOR]

With the increasing energy crisis and environmental pollution, rechargeable aqueous Zn‐based batteries (AZBs) are receiving unprecedented attention due to their list of merits, such as low cost, high safety, and nontoxicity. However, the limited voltage window, Zn dendrites, and relatively low specific capacity are still great challenges. In this work, a new reaction mechanism of reversible Mn2+ ion oxidation deposition is introduced to AZBs. The assembled Mn2+/Zn2+ hybrid battery (Mn2+/Zn2+ HB) based on a hybrid storage mechanism including Mn2+ ion deposition, Zn2+ ion insertion, and conversion reaction of MnO2 can achieve an ultrawide voltage window (0–2.3 V) and high capacity (0.96 mAh cm−2). Furthermore, the carbon nanotubes coated Zn anode is proved to effectively inhibit Zn dendrites and control side reaction, hence exhibiting an ultrastable cycling (33 times longer than bare Zn foil) without obvious polarization. Benefiting from the optimal Zn anode and highly reversible Mn2+/Zn2+ hybrid storage mechanism, the Mn2+/Zn2+ HB shows an excellent cycling performance over 11 000 cycles with a 100% capacity retention. To the best of the authors' knowledge, it is the highest reported cycling performance and wide voltage window for AZBs with mild electrolyte, which may inspire a great insight into designing high‐performance aqueous batteries. [ABSTRACT FROM AUTHOR]

Fiber supercapacitors have aroused great interest in the field of portable and wearable electronic devices. However, the restrained surface area of fibers and limited reaction kinetics of active materials are unfavorable for performance enhancement. Herein, an efficient multicomponent hierarchical structure is constructed by integrating the Cu‐doped cobalt copper carbonate hydroxide@nickel cobalt layered double hydroxide (CCCH@NiCo‐LDH) core–shell nanowire arrays (NWAs) on Cu fibers with highly conductive Au‐modified CuO nanosheets (CCCH@NiCo‐LDH NWAs@Au–CuO/Cu) via a novel in situ corrosion growth method. This multicomponent hierarchical structure contributes to a large accessible surface area, which results in sufficient permeation of the electrolyte. The Cu dopant could reduce the work function and facilitate fast charge transfer kinetics. Therefore, the effective ion diffusion and electron conduction will facilitate the electrochemical reaction kinetics of the electrode. Benefiting from this unique structure, the electrode delivers a high specific capacitance (1.97 F cm−2/1237 F g−1/193.3 mAh g−1) and cycling stability (90.8% after 30 000 cycles), exhibiting superb performance compared with most oxide‐based fiber electrodes. Furthermore, the hybrid fiber supercapacitor of CCCH@NiCo‐LDH NWAs@Au–CuO/Cu//VN/carbon fibers is fabricated, providing a remarkable maximal energy density of 34.97 Wh kg−1 and a power density of 13.86 kW kg−1, exhibiting a great potential in high‐performance fiber‐shape energy‐related systems. [ABSTRACT FROM AUTHOR]

Niobium pentoxides (Nb2O5) have attracted extensive interest for ultrafast lithium‐ion batteries due to their impressive rate/capacity performance and high safety as intercalation anodes. However, the intrinsic insulating properties and unrevealed mechanisms of complex phases limit their further applications. Here, a facile and efficient method is developed to construct three typical carbon‐confined Nb2O5 (TT‐Nb2O5@C, T‐Nb2O5@C, and H‐Nb2O5@C) nanoparticles via a mismatched coordination reaction during the solvothermal process and subsequent controlled heat treatment, and different phase effects are investigated on their lithium storage properties on the basis of both experimental and computational approaches. The thin carbon coating and nanoscale size can endow Nb2O5 with a high surface area, high conductivity, and short diffusion length. As a proof‐of‐concept application, when employed as LIB anode materials, the resulting T‐Nb2O5@C nanoparticles display higher rate capability and better cycling stability as compared with TT‐Nb2O5@C and H‐Nb2O5@C nanoparticles. Furthermore, a synergistic effect is investigated and demonstrated between fast diffusion pathways and stable hosts in T‐Nb2O5 for ultrafast and stable lithium storage, based on crystal structure analysis, in situ X‐ray diffraction analysis, and density functional theoretical calculations. Therefore, the proposed synthetic strategy and obtained deep insights will stimulate the development of Nb2O5 for ultrafast and long‐life LIBs. [ABSTRACT FROM AUTHOR]

On‐chip microbatteries have attracted growing attention due to their great feasibility for integration with miniaturized electronic devices. Nevertheless, it is difficult to get both high energy/power densities in microbatteries. An increase in the thickness of microelectrodes may help to boost the areal energy density of device, yet it often leads to terrible sacrifice in its power density due to the longer electron and ion diffusion distances. In this work, a quasi‐solid‐state on‐chip Ni–Zn microbattery is designed based on a hierarchical ordered porous (HOP) Ni@Ni(OH)2 microelectrode, which is developed by an in situ anodizing strategy. The fabricated microelectrode can optimize ion and electron transport simultaneously due to its interconnected ordered macropore–mesopore network and high electron conductivity. As the thickness of microelectrode increases, the areal energy density of HOP Ni@Ni(OH)2 microelectrode shows an ascending trend with negligible sacrifice in power density and rate performance. Impressively, this Ni–Zn microbattery achieves excellent energy/power densities (0.26 mW h cm−2, 33.8 mW cm−2), outperforming most previous reported microenergy storage devices. This study may provide new direction in high‐performance and highly safe microenergy storage units for next‐generation highly integrated microelectronics. [ABSTRACT FROM AUTHOR]

Searching for new‐type cathodes to enhance the capacity of Na‐ion batteries is one of the hot spots in energy storage systems. Many sodium insertion transition metal oxides, i.e., Na‐Mn‐O compounds, are intensively studied owing to their high voltage, abundant resources, and low toxicity. However, its relatively low capacity greatly limits its application. Here, a new synergistic composite, 0.44Na4Mn2O5•0.56Na0.7MnO2, is developed by a feasible method of organic‐acid‐assisted drying and heat treatment. This synergistic composite cathode delivers a reversible sodium storage capacity as high as 278.0 mAh g−1 and stable framework structure due to the synergistic effect. It is achieved by the synergistic effect of high capacity Na4Mn2O5 with multiple Na+ ions insert/extract sites and stable Na0.7MnO2 with layered structure. Even when tested at a high mass loading of 7.42 mg cm−2, this composite cathode demonstrates stable cycling over 400 cycles for sodium storage. Moreover, when coupled with hard carbon anode, Na‐ion full battery delivers excellent charge/discharge performance with capacity retention of 84.0%, showing great application potential in the large‐scale energy storage field. Synergistic composite structured xNa4Mn2O5•(1−x)Na0.7MnO2 is synthesized for the first time. The synergistic composite cathode delivers high reversible sodium storage capacity and stable framework structure due to the synergistic effect. The new synergistic composite structured 0.44Na4Mn2O5•0.56Na0.7MnO2 is a promising cathode material for high‐energy density Na‐ion batteries. [ABSTRACT FROM AUTHOR]