期刊
ELECTROCHEMISTRY
卷 86, 期 2, 页码 29-31出版社
ELECTROCHEMICAL SOC JAPAN
DOI: 10.5796/electrochemistry.17-00089
关键词
FSI Anion Based Ionic Liquid; Graphite Electrode/Electrolyte Interface; SEI Film
We investigated effects of high lithium bis(fluorosulfonyl) imide (LiFSI) salt concentration or heat treatment before initial charge on charge-discharge performance of a graphite electrode in a 1-ethyl-3-methylimidazolium (EMImFSI)-based ionic liquid (IL) electrolyte. LiF was observed at the surface of graphite electrodes taken out from 2.00 mol kg(-1) LiFSI/EMImFSI system and from 0.32 mol kg(-1) LiFSI/EMImFSI system with pre-heat treatment before the initial charge. The surface LiF effectively suppresses the reductive decomposition of EMIm(+). As a result, the irreversible capacity of initial cycle was significantly suppressed and the coulombic efficiency of subsequent cycles was greatly improved. (c) The Electrochemical Society of Japan, All rights reserved.
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