Electrochemical Performance of Si/Graphite/Carbon Composite Electrode in Mixed Electrolytes Containing LiBOB and LiPF6

被引：25

作者：

Li, Ming-Qi ^{[1
,2
,3
]}

Qu, Mei-Zhen ^{[1
]}

He, Xiao-Ying ^{[2
]}

Yu, Zuo-Long ^{[1
]}

机构：

[1] Chinese Acad Sci, Chengdu Inst Organ Chem, Chengdu 610041, Peoples R China

[2] China W Normal Univ, Coll Chem & Chem Engn, Nanchong 637002, Peoples R China

[3] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2009年 / 156卷 / 04期

关键词：

carbon; composite materials; electrochemical electrodes; electrochemical impedance spectroscopy; elemental semiconductors; graphite; lithium compounds; phosphorus compounds; scanning electron microscopy; silicon; solid electrolytes; X-ray photoelectron spectra; LITHIUM-ION BATTERIES; THIN-FILM ELECTRODE; ANODE MATERIAL; NANO-SILICON; DEPOSITION; INSERTION; CELLS;

D O I：

10.1149/1.3076196

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The influences of lithium bis(oxalato) borate (LiBOB), vinylene carbonate (VC)-containing LiPF6, and the mixed electrolytes with their different ratios on the electrochemical properties of Si/graphite/disordered carbon (Si/G/DC) composite electrode were investigated. Si/G/DC in mixed electrolytes presented better cyclability than in LiPF6 with VC and a higher specific capacity than in LiBOB. Si/G/DC in 0.5 M LiBOB+0.38 M LiPF6 electrolytes exhibited a high reversible capacity of 512 mAh g(-1) and a high and stable coulombic efficiency after the first cycle when cycled at a rate of 168 mA g(-1). Even after 220 cycles, the reversible capacity was still as high as 432 mAh g(-1), with a capacity fading of less than 0.08% per cycle. The analysis of scanning electron microscopy, electrochemical impedance spectra, and X-ray photoelectron spectroscopy indicated that the improvement of Si/G/DC composite electrode in cyclability resulted from the formation of impact and stable solid electrolyte interphase layers.

引用

页码：A294 / A298

页数：5