Nanosized tin microencapsulated graphite as the anode in lithium-ion cells

被引：0

作者：

Wang, GX ^{[1
]}

Yao, J ^{[1
]}

Liu, HK ^{[1
]}

Dou, SX ^{[1
]}

Ahn, JH ^{[1
]}

机构：

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

来源：

METASTABLE, MECHANICALLY ALLOYED AND NANOCRYSTALLINE MATERIALS | 2003年

关键词：

graphite anodes; lithium-ion batteries; micro encapsulation; nanosized particles;

D O I：

暂无

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Microencapsulating nanosized Sn particles in graphite developed a series of new anode composite materials for lithium-ion batteries. The nanosized Sn particles are homogeneously dispersed in graphite matrix via in situ 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, with an accompanying 400 % volume increase. The ductile graphite. matrix provides a perfect buffer layer to absorb such volume expansion. Therefore, the integrity of the composite electrode is preserved during lithium insertion and extraction. The reaction process of lithium insertion and extraction into the graphite structure, and lithium alloying with tin has been identified by cyclic voltammetry measurement. The new tin-graphite composites provide a new. type of anode materials for lithium-ion, batteries with increased capacity.

引用

页码：739 / 744

页数：6

共 12 条

[1]

Armand M. B., 1980, Materials for Advanced Batteries. Proceedings of a NATO Symposium on Materials for Advanced Batteries, P145

[2]

BENSENHARD JO, 1997, J POWER SOURCES, V68, P87

[3] Short-range order in disordered carbons: where does the Li go? [J].