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Carbonaceous materials are regarded as prospective anode candidates of potassium‐ion batteries. However, the rate capability and cycling stability of classic carbon materials are still far from satisfactory. Herein, we exploit a facile and low‐cost strategy to enable the precise synthesis of sulfur/nitrogen co‐doped in‐plane porous carbon nanosheets with fishnet‐shaped microstructure (SN‐CNSs). The well‐designed in‐plane porous structure and the interconnected carbon flake network can accelerate the diffusion of potassium ions, alleviate volume expansion, and provide sufficient active sites. As a result, the SN‐CNSs deliver an impressively reversible capacity of 248 mAh g−1 at a current density of 1 A g−1 after 4500 cycles, and an excellent rate capacity of 137.3 mAh g−1 after 4000 cycles under 5 A g−1. Density functional theory (DFT) calculations further verify the advantage of S/N co‐doping in the adsorption/diffusion of K‐ion in SN‐CNSs materials. Such an excellent performance shows that SN‐CNSs possess a great potential to be a superior anode of potassium‐ion batteries. [ABSTRACT FROM AUTHOR]

A facile electrospinning technique followed by pre‐oxidation and carbonization treatment is adopted to synthesize silicon anode cladded with SiOx layer and N‐rich carbon nanofibers (Si@SiOx@NCNFs), in which post‐used polyacrylonitrile (PAN) yarn is chosen as single carbon source. As anode in Li‐ion batteries, elaborately designed Si@SiOx@NCNFs renders remarkable reversible capacities of 1045 mA h g−1 at the 500th cycle under a current density of 8 A g−1 at 80°C, and 828 mA h g−1 after subsequent 500 cycles at 15 A g−1, mainly ascribed to the distinct hierarchical structure, N‐rich nature and enhanced pesudocapacitive behavior. When Si@SiOx@NCNFs is matched with commercial cathode LiFePO4, full cell delivers a stable capacity of 140 mA h g−1 at 100 mA g−1, accompanying with an energy density of 455 Wh kg−1 at 50 °C. These conspicuous features undoubtedly enable Si@SiOx@NCNFs to be promising anode materials for high‐power lithium‐ion battery used in harsh conditions. [ABSTRACT FROM AUTHOR]

Cover Feature: Sulfur/Nitrogen Co-Doped In-Plane Porous Carbon Nanosheets as Superior Anode of Potassium-Ion Batteries (Batteries & Supercaps 5/2022) Carbon nanosheets, DFT calculations, low temperature graphitization, porous structure, potassium-ion batteries anode Keywords: carbon nanosheets; DFT calculations; low temperature graphitization; porous structure; potassium-ion batteries anode EN carbon nanosheets DFT calculations low temperature graphitization porous structure potassium-ion batteries anode 1 1 1 05/10/22 20220501 NES 220501 B The Cover Feature b shows porous carbon nanosheets with fishnet-like microstructures, featuring excellent potassium-ion storage capacity as anodes for potassium-ion batteries, possessing great potential for powering the future city. [Extracted from the article]

Potassium-ion energy-storage devices have established themselves as the most important candidates for next-generation energy-storage devices in the coming future. Recently, inorganic electrode materials have riveted ever-increasing interest due to large theoretical capacity, rich sources, low price and environmental friendly advantages. However, the electrode materials of potassium-containing devices have been suffering low theoretical capacity, poor rate performance and short lifespan due to integration effects of seriously electrochemical pulverization and slow kinetics. In this timely review, we will focus on the latest progress of potassium ion energy storage devices based on beyond-carbon materials, referring to the synthesis of materials and the construction of microstructure, material component-oriented electrochemical performance, energy storage mechanism discussion, newfangled device assembly and key components. The key materials and novel theories are reviewed, and some personal viewpoints have been proposed, targeting providing some inductive opinions. Potassium-ion energy-storage devices have established themselves as one of the most important candidates for next-generation energy-storage devices in the coming future. In this timely review, we will focus on the latest progress of key materials and novel theories in potassium-containing devices. And some personal viewpoints have been proposed, targeting providing some inductive opinions. [Display omitted] • The beyond-carbon anode materials for potassium ion batteries were systematically analyzed and summarized. • Other components of potassium ion batteries, such as cathode, electrolyte and binder, were also studied. • The development bottleneck of potassium ion battery was analyzed and some countermeasures were put forward. • It provides comprehensive and reliable information and enlightening opinions for the researchers of new energy devices. [ABSTRACT FROM AUTHOR]