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Lithium metal (LM) is a promising anode material for next generation lithium ion based electrochemical energy storage devices. Critical issues of unstable solid electrolyte interphases (SEIs) and dendrite growth however still impede its practical applications. Herein, a composite gel polymer electrolyte (GPE), formed through in situ polymerization of pentaerythritol tetraacrylate with fumed silica fillers, is developed to achieve high performance lithium metal batteries (LMBs). As evidenced theoretically and experimentally, the presence of SiO2 not only accelerates Li+ transport but also regulates Li+ solvation sheath structures, thus facilitating fast kinetics and formation of stable LiF‐rich interphase and achieving uniform Li depositions to suppress Li dendrite growth. The composite GPE‐based Li||Cu half‐cells and Li||Li symmetrical cells display high Coulombic efficiency (CE) of 90.3% after 450 cycles and maintain stability over 960 h at 3 mA cm−2 and 3 mAh cm−2, respectively. In addition, Li||LiFePO4 full‐cells with a LM anode of limited Li supply of 4 mAh cm−2 achieve capacity retention of 68.5% after 700 cycles at 0.5 C (1 C = 170 mA g−1). Especially, when further applied in anode‐free LMBs, the carbon cloth||LiFePO4 full‐cell exhibits excellent cycling stability with an average CE of 99.94% and capacity retention of 90.3% at the 160th cycle at 0.5 C. [ABSTRACT FROM AUTHOR]

Insight into the Fast-Rechargeability of a Novel Mo1.5W1.5Nb14O44 Anode Material for High-Performance Lithium-Ion Batteries (Adv. Keywords: doping; electrical conductivity; fast-rechargeable lithium-ion batteries; ionothermal synthesis; lithium-ion diffusivity; Mo1.5W1.5Nb14O44 EN doping electrical conductivity fast-rechargeable lithium-ion batteries ionothermal synthesis lithium-ion diffusivity Mo1.5W1.5Nb14O44 1 1 1 09/27/22 20220922 NES 220922 B Lithium Ion Batteries b In article number 2200519, Sheng Dai and co-workers facilely develop a new high-performance nanoporous Mo SB 1.5 sb W SB 1.5 sb Nb SB 14 sb O SB 44 sb lithium-ion battery anode material via a novel ionothermal-synthesis-assisted doping strategy, realizing the concurrent improvement of lithium-ion diffusivity and electrical conductivity. Doping, electrical conductivity, fast-rechargeable lithium-ion batteries, ionothermal synthesis, lithium-ion diffusivity, Mo1.5W1.5Nb14O44. [Extracted from the article]

Li 4-x Mg x Ti 5 O 12 (0 ≦ X ≦ 0.2) anode material was synthesized by a solid-state method using Li 2 CO 3 , MgO and anatase TiO 2 . The effects of Mg element doping on the crystal structure, phase composition, morphology and electrochemical properties of Li 4-x Mg x Ti 5 O 12 were investigated by XRD, SEM and EDX. The electrochemical properties of Li 4-x Mg x Ti 5 O 12 were characterized through Cyclic voltammetry and AC impedance experiments. The results indicated that when x = 0.10, the resultants show better electrochemical performance in higher rates cycle stability and the polarization degree. The initial discharge capacity reaches 122.5 mAh/g at 2 C, and the discharge capacity still remains 119.3 mAh/g after 100 cycles. [ABSTRACT FROM AUTHOR]

• NiF x @Ni foam was prepared via a succinct fluorination strategy. • LiF-enriched SEI layer can be in-situ formed through the reaction between NiF x and Li +. • Li@NiF x @NF composite anodes exhibit excellent stability in both symmetry battery and full cell. Metallic lithium is considered as the optimal anode material for the high-energy–density rechargeable lithium-based battery. However, the commercial application of Li metal anode is plagued by uncontrollable dendrites growth and unstable SEI layer derived from the nonuniform nucleation and undesired deposition process. Herein, a hybrid 3D porous Ni foam (NF) current collector decorated by nanostructured lithiophilic layer of interconnected NiF x nanosheets is firstly synthesized by a convenient one-step fluorination strategy. Benefiting from superior lithiophilicity, the NiF x nanosheets can successfully decrease the Li nucleation barrier and act as uniformly distributed nucleation sites for inducing the homogeneous Li deposition. In addition, the interconnected morphology of the NiF x nanosheets and the 3D porous structure of the NF effectively reduce the local current density of the electrode and thus alleviate the dendrites formation. Moreover, a LiF-enriched SEI layer in situ generated from the electrochemical reaction also facilitates the smooth Li plating. As a result, this 3D hybrid NiF x @NF current collector demonstrates dendrite-suppressed Li deposition morphology and excellent stripping/plating reversibility, presenting significantly enhanced Coulombic efficiency of ~ 98% over 450 cycles at 1 mA cm−2. Remarkably, symmetric cell with Li@NiF x @NF anode achieves a prolonged cycling lifespan over 1300 h together with a low overpotential of ~ 20 mV at 1 mA cm−2 under the cycling capacity of 1 mAh cm−2. Furthermore, excellent cycling performance and rate capability of the Li@NiF x @NF anode are also realized in full cells when coupled with LiFePO 4 and Li 4 Ti 5 O 12 cathodes. Our work not only provides an expeditious fluorination strategy to construct 3D fluorinated compound but also illustrates the superiority of synergetic design of lithiophilic sites plus LiF-enriched SEI layer for the current collector of Li metal anode. [ABSTRACT FROM AUTHOR]

Lithium metal batteries (LMBs) have been regarded as the most promising battery system for the next-generation high energy density batteries due to the extremely high specific capacity of the lithium (Li) metal anode. Unfortunately, the commercial application has been hindered by sharp dendrite Li growth and infinite relative volume change during the repeated charge/discharge process, which lead to severe safety issues and poor cyclability of the battery. Herein, a novel composite Lithium anode is fabricated via thermally infusion molten Li into three-dimensional (3D) nickel foam (NF) framework decorated by lithiophilic Co 3 O 4 nanosheet arrays. The universalized growth of Co 3 O 4 nanosheet on the Ni foam can provide superior wettability between the molten Li and Ni foam, and facilitate more convenient infusion process (5 s). Benefitting from uniform distribution of Li in the 3D host and homogeneous Li+ flux on the surface of the electrode, excellent Li stripping/plating performance (1000 h at 3 mA cm−2 and 275 h at 5 mA cm−2) and dendrite-suppressed morphology are achieved for the Li–Co 3 O 4 /NF composite anode. When utilized in full cells paired with a LiFePO 4 cathode, the Li–Co 3 O 4 /NF composite anode demonstrates greater cyclability and rate performance than bare Li anode. As a result, the obtained Co 3 O 4 /NF demonstrates excellent electrochemical performance as a lithium host skeleton for advanced Li metal battery. Image 1 • The Co 3 O 4 nanosheet coated on the Ni foam greatly improves the lithiophilicity of the Ni foam framework and enables faster Li-infusion process of less than 5s. • This Li–Co 3 O 4 /NF composite anode displays excellent electrochemical performance in symmetrical cell and exhibits a much stable overpotential, and maintains flat voltage profiles over 1000 h at a current density of 3 mA cm−2. • This Li–Co 3 O 4 /NF composite anode shows dendrite-free morphology when cycled after 540 cycles at a current density of 5 mA cm−2. • This Li–Co 3 O 4 /NF anodes display superior rate performance and cycling stability with 90% capacity retention after 500 cycles at 2C. [ABSTRACT FROM AUTHOR]

• The electrochemical property of Li 4 T 5 O 12 electrode can be improved by mixing liquid metal alloy. • The LM-LTO electrode exhibits superior rate and cycling performance. • LM is beneficial to the conductivity improvement of composite electrode. The spinel lithium titanate (Li 4 Ti 5 O 12 , LTO) has attracted special attention for its low cost, stable structure and little safety issue. However, LTO displays a low electronic conductivity, which seriously impedes its practical applications at remarkable rate capability. Herein, to improve the electrochemical properties of LTO, this research constructed a novel composite anode by mixing the GaSn liquid metal (LM) nanoparticles with LTO. The composite anode's phase structure and morphology were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical data indicate that LM-LTO electrode delivers a better rate capability (52% retention from 10 mA/g to 500 mA/g) as well as long cyclic stability (76% retention after 1000 cycles at 200 mA/g). Therefore, this work opens a new avenue for fabricating better rate performance and safer lithium ions battery. [ABSTRACT FROM AUTHOR]