Electrochemical lithiation of new graphite-nanosized tin particle materials obtained by SnCl2 reduction in organic medium

被引：29
作者：
Balan, L
Schneider, R
Ghanbaja, J
Willmann, P
Billaud, D
机构：
[1] UHP Nancy 1, CNRS, UMR 7555, LCSM, F-54506 Vandoeuvre Les Nancy, France
[2] UHP Nancy 1, CNRS, UMR 7565, LSOR, F-54506 Vandoeuvre Les Nancy, France
[3] CNES, F-31055 Toulouse, France
来源：
ELECTROCHIMICA ACTA | 2006年 / 51卷 / 17期
关键词：
lithium-ion battery; graphite; tin; anodic material; chemical reduction;
D O I：
10.1016/j.electacta.2005.09.045
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
SnCl2 was reduced in the presence of graphite by t-BuONa-activated NaH. The resulting (tin/graphite)-based system was composed of nanosized tin particles deposited on the graphite surface and of free tin aggregates. Lithium electrochemical insertion occurs in graphite and in tin. A reversible specific charge of 500 mAh/g is found stable upon cycling. This value is lower than the maximum theoretical one (650 mAh/g) assuming a Sn/12C molar composition and the formation of the highest lithium content alloy Li22Sn5. It is suggested that the part of tin responsible for the stable reversible capacity is the one bound to graphite. To the contrary, free tin aggregates could contribute to a capacity which decreases upon cycling in connection with the volume changes accompanying lithium insertion/extraction in/out of these aggregates. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码：3385 / 3390
页数：6
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