电解质
溶解
氧化物
锂(药物)
相间
阴极
电池(电)
锰
无机化学
化学
电极
化学工程
分解
材料科学
有机化学
物理化学
功率(物理)
量子力学
内分泌学
工程类
物理
生物
医学
遗传学
作者
Xuedi Yuan,Tao Dong,Jiaxin Liu,Yingyue Cui,Haotian Dong,Du Yuan,Haitao Zhang
标识
DOI:10.1002/ange.202304121
摘要
The practical implementation of high-voltage lithium-rich manganese oxide (LRMO) cathode is limited by the unanticipated electrolyte decomposition and dissolution of transition metal ions. The present study proposes a bi-affinity electrolyte formulation, wherein the sulfonyl group of ethyl vinyl sulfone (EVS) imparts a highly adsorptive nature to LRMO, while fluoroethylene carbonate (FEC) exhibits a reductive nature towards Li metal. This interface modulation strategy involves the synergistic use of EVS and FEC as additives to form robust interphase layers on the electrode. As-formed S-endorsed but LiF-assisted configuration cathode electrolyte interphase with a more dominant −SO2− component may promote the interface transport kinetics and prevent the dissolution of transition metal ions. Furthermore, the incorporation of S component into the solid electrolyte interphase and the reduction of its poorly conducting component can effectively inhibit the growth of lithium dendrites. Therefore, a 4.8 V LRMO/Li cell with optimized electrolyte may demonstrate a remarkable retention capacity of 97 % even after undergoing 300 cycles at 1 C.
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