溶剂化
环丁砜
阳极
石墨
材料科学
氟
阴极
离子
溶剂
化学工程
电解质
锂(药物)
无机化学
纳米技术
化学
复合材料
有机化学
电极
物理化学
冶金
内分泌学
工程类
医学
作者
Qinfeng Zheng,Guanjie Li,Xiongwen Zheng,Lidan Xing,Kang Xu,Weishan Li
出处
期刊:Energy & environmental materials
日期:2021-07-09
卷期号:5 (3): 906-911
被引量:19
摘要
The non‐flammability and high oxidation stability of sulfolane (SL) make it an excellent electrolyte candidate for lithium‐ion batteries (LIBs). However, its incompatibility with graphitic anode prevents the realization of these advantages. To understand how this incompatibility arises on molecular level so that it can be suppressed, we combined theoretical calculation and experimental characterization and reveal that the primary Li + solvation sheath in SL is depleted of fluorine source. Upon reduction, SL in such fluorine‐poor solvation sheath generates insoluble dimer with poor electronic insulation, hence leading to slow but sustained parasitic reactions. When fluorine content in Li + ‐SL solvation sheath is increased via salt concentration, a high stability LiF‐rich interphase on graphite can be formed. This new understanding of the failure mechanism of graphite in SL‐based electrolyte is of great significance in unlocking many possible electrolyte solvent candidates for the high‐voltage cathode materials for next‐generation LIBs.
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