Enhancement of Li-ion battery performance of graphite anode by sodium ion as an electrolyte additive

被引:109
作者
Komaba, S
Itabashi, T
Kaplan, B
Groult, H
Kumagai, N [1 ]
机构
[1] Iwate Univ, Dept Chem Engn, Morioka, Iwate 0208551, Japan
[2] Univ Paris 06, LI2C Lab, CNRS, UMR 7612, F-75252 Paris 05, France
基金
日本学术振兴会;
关键词
graphite; lithium-ion battery; lithium intercalation; sodium additive; SEI;
D O I
10.1016/j.elecom.2003.09.003
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Electrochemical performance of a graphite electrode for lithium-ion batteries was successfully and easily improved by sodium ion dissolved in an electrolyte solution. Sodium ion was added by dissolving 0.22 mol dm(-3) NaClO4 into a 1 mol dm(-3) LiClO4 ethylene carbonate-diethyl carbonate (1:1 by volume) electrolyte solution prior to charge-discharge cycle. By sodium-ion addition, an irreversible capacity at the initial cycle was obviously reduced, and reversible discharge capacities increased with better capacity retention. From ac impedance measurements, a graphite electrode in the sodium ion added electrolyte had much smaller interface resistance compared to that obtained in sodium ion free one. Furthermore, the electrode surface morphology observed by electron microscopes after charge-discharge tests got more uniform in the sodium added electrolyte. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:962 / 966
页数:5
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