Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
Communications
Effects of Organic Additives on Lithium Insertion/extraction for Graphite Electrode in Ionic Liquid Electrolytes Based on Bis(fluorosulfonyl)imide
Toshinori SUGIMOTOYosuke ATSUMINorihisa HANDAMasaki YAMAGATAMichiyuki KONOManabu KIKUTAEriko ISHIKOMasashi ISHIKAWA
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JOURNALS OPEN ACCESS

2009 Volume 77 Issue 8 Pages 696-698

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Abstract

The electrochemical behavior of a graphitized electrode was investigated in a room-temperature ionic liquid based on bis(fluorosulfonyl)imide (FSI) with the addition of propylene carbonate (PC) or vinylene carbonate (VC). The reversible, significant lithium-ion (Li+) insertion/extraction was observed in the additive-free FSI-based ionic liquid, while the additive systems showed weak, reversible responses (VC) and degraded responses (PC). AC impedance measurements suggested that the presence of FSI extremely reduces the electrode/electrolyte interface impedance, which allows Li+ to intercalate into a graphitized electrode reversibly. By contrast, the addition of VC inhibits the reversible Li+ intercalation in spite of FSI existence.

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© 2009 The Electrochemical Society of Japan
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