Graphite/electrolyte interface formed in LiBOB-based electrolytes - I. Differentiating the roles of EC and LiBOB in SEI formation

被引：71

作者：

Xu, K ^{[1
]}

Lee, U ^{[1
]}

Zhang, SS ^{[1
]}

Allen, JL ^{[1
]}

Jow, TR ^{[1
]}

机构：

[1] USA, Res Lab, Adelphi, MD 20783 USA

来源：

ELECTROCHEMICAL AND SOLID STATE LETTERS | 2004年 / 7卷 / 09期

关键词：

D O I：

10.1149/1.1774973

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The surface chemistry of graphitic anodes cycled in various lithium bis(oxalato)borate (LiBOB)-based electrolytes was studied by X-ray photoelectron spectroscopy, and a correlation was established between the C 1s spectra and the participation of the BOB- anion. Through continuous removal of the semicarbonate species by Ar+ bombardment, it was found that the main solid-electrolyte interface (SEI) ingredients come from two competing sources: the reduction products of cyclic carbonate and those of BOB- anion. Ethylene carbonate (EC) in electrolyte should control the initial surface chemistry owing to its higher reduction potential, while in EC-free solutions, BOB- anion is the main source of reduction products. The performances at elevated temperatures seem to require the coexistence of LiBOB and EC in electrolyte. (C) 2004 The Electrochemical Society.

引用

页码：A273 / A277

页数：5

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