多硫化物
电解质
电化学
溶解
阳极
溶剂化
无机化学
化学
溶剂
阴极
电池(电)
储能
钠
化学工程
材料科学
电极
有机化学
功率(物理)
物理
物理化学
量子力学
工程类
作者
Junru Wu,Yao Tian,Yifu Gao,Zihao Gao,Yuefeng Meng,Yao Wang,Xia Wang,Dong Zhou,Feiyu Kang,Baohua Li,Guoxiu Wang
标识
DOI:10.1002/anie.202205416
摘要
Rechargeable room-temperature sodium-sulfur (RT Na-S) batteries are a promising energy storage technology, owing to the merits of high energy density and low cost. However, their electrochemical performance has been severely hindered by the poor compatibility between the existing electrolytes and the electrodes. Here, we demonstrate that an all-fluorinated electrolyte, containing 2,2,2-trifluoro-N,N-dimethylacetamide (FDMA) solvent, 1,1,2,2-tetrafluoroethyl methyl ether (MTFE) anti-solvent and fluoroethylene carbonate (FEC) additive, can greatly enhance the reversibility and cyclability of RT Na-S batteries. A NaF- and Na3 N-rich cathode electrolyte interphase derived from FDMA and FEC enables a "quasi-solid-phase" Na-S conversion, eliminating the shuttle of polysulfides. The MTFE not only reduces polysulfide dissolution, but also further stabilizes the Na anode via a tailored solvation structure. The as-developed RT Na-S batteries deliver a high capacity, long lifespan, and enhanced safety.
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