Electrochemical properties of nanosize Sn-coated graphite anodes in lithium-ion cells

被引：23

作者：

Wang, GX ^{[1
]}

Yao, J ^{[1
]}

Ahn, JH ^{[1
]}

Liu, HK ^{[1
]}

Dou, SX ^{[1
]}

机构：

[1] Univ Wollongong, Inst Supercond & Elect Mat, Battery Technol Res Program, Wollongong, NSW 2522, Australia

来源：

JOURNAL OF APPLIED ELECTROCHEMISTRY | 2004年 / 34卷 / 02期

基金：

澳大利亚研究理事会;

关键词：

lithium intercalation; lithium-ion battery; micro-encapsulation; Sn-coated graphite;

D O I：

10.1023/B:JACH.0000009964.04081.aa

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A series of Sn- coated graphite composite materials for lithium- ion batteries were prepared by microencapsulating nanosize Sn particles in graphite. The nanosize Sn particles are homogeneously dispersed in the graphite matrix via electroless chemical reduction. The tin- graphite composite showed a great improvement in lithium storage capacity. Since Sn is an active element to lithium, Sn can react with lithium to form Li4.4Sn alloys, a reaction accompanied by a dramatic volume increase, whereas the ductile graphite matrix provides a perfect buffer layer to absorb this volume expansion. Therefore, the integrity of the composite electrode is preserved during lithium insertion and extraction. Cyclic voltammetry was employed to identify the reaction process involved in lithium insertion and extraction in the graphite structure, as well as lithium alloying with tin. The tin- graphite composites provide a new type of anode material for lithium- ion batteries with an increased capacity.

引用

页码：187 / 190

页数：4

共 15 条

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