Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
Communications
A New Prospect for Stabilization of Graphite Electrode/Electrolyte Interface in Bis(fluorosulfonyl)imide Anion-based Ionic Liquid Electrolyte
Satoshi UCHIDAUtaho IMAMURAMasashi ISHIKAWA
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ジャーナル オープンアクセス

86 巻 (2018) 2 号 p. 29-31

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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.

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© 2018 The Electrochemical Society of Japan
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