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Zhou, Xunzhu; Zhang, Qiu; Zhu, Zhuo; Cai, Yichao; Li, Haixia; Li, Fujun
Angewandte Chemie International Edition, July 25, 2022, Letnik: 61, Številka: 30Journal Article
Metallic Na is a promising anode for rechargeable batteries, however, it is plagued by an unstable solid electrolyte interphase (SEI) and Na dendrites. Herein, a robust anion‐derived SEI is constructed on Na anode in a high‐concentration 1,2‐dimethoxyethane (DME) based electrolyte with a cosolvent hydrofluoroether, which effectively restrains Na dendrite growth. The hydrofluoroether can tune the solvation configuration of the electrolyte from three‐dimensional network aggregates to solvent–cation–anion clusters, enabling more anions to enter and reinforce the inner solvation sheath and their stepwise decomposition. The gradient inorganic‐rich SEI leads to a reduced energy barrier of Na+ migration and enhanced interfacial kinetics. These render the Na||Na3V2(PO4)3 battery with an excellent rate capability of 79.9 mAh g−1 at 24 C and a high capacity retention of 94.2 % after 6000 cycles at 2 C. This highlights the modulation of the electrode–electrolyte interphase chemistry for advanced batteries. A gradient inorganic‐rich interphase is constructed on Na surface in a high‐concentration ether‐based electrolyte with a cosolvent hydrofluoroether. It leads to a configuration of solvent–cation–anion clusters for a reinforced inner solvation sheath. The derived interphase results in a reduced energy barrier for Na+ migration and fast interfacial kinetics, and hence excellent electrochemical performance.
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