锂离子电池用SnZn/Cu薄膜负极材料的研究
SnZn/Cu Film Anode for Lithium-ion Batteries
王连邦 1康虎强 1徐土根 1黄立军 1马淳安1
作者信息
- 1. 浙江工业大学化学工程与材料学院绿色化学合成技术国家重点实验室培育基地,杭州,310014
- 折叠
摘要
合金型锂离子电池负极材料由于容量高、安全性好而备受关注.采用磁控溅射法在铜箔上渡膜制备锡锌薄膜,经热处理后得到合金薄膜电极.薄膜热处理后,表面活性层形成Cu_3sn中间合金.合金薄膜是由尺寸在5 μm左右的合金颗粒构成,而合金颗粒则由更小的尺寸在50 nm左右微粒组成,该合金薄膜同时具有薄膜、中间合金和纳米结构材料的特征.合金薄膜电极具有较高的充放电容量、良好的循环性能和非常高的充放电效率.在0.01～1.0 V(vs.Li/Li~+)区间,电极循环200周后放电容量保持在300 mAh·g~(-1)以上,与第一次脱锂容量相比较,容量保持率高达91.9%,充放电效率大于98.0%.
Abstract
Alloy negative materials for Li-ion batteries have been focused on because of high specific capacity and safety,which would be a promising material for next generation Li-ion batteries.In this work,alloy film anode has been prepared by depositing SnZn on Cu foil with a magnetron sputtering method,followed by heat-treatment.A Cu_3Sn intermetallic composite was formed after the heat-treatment.The SEM result showed that the alloy film was composed of alloy particles with the size of around 5 μm,and the alloy particle was composed of smaller particles with size of around 50 nm.The alloy film anode showed high charge-discharge capacity and columbic efficiency,and good cyclic stability.At potential of 0.01 ~ 1.0 V (vs.Li/Li~+),the discharge capacity remained over 300 mAh·g~(-1) after 200 cycles,and the columbic efficiency was over 98.0%.These results should be attributed to the unique structure of the alloy film anode composed of intermetallic composite,thin film and nano-sized active material.
关键词
锂离子电池/负极材料/磁控溅射/锡/薄膜Key words
Li-ion battery/negative material/magnetron sputtering/tin/film引用本文复制引用
基金项目
国家自然科学基金(20506024)
国家重点基础研究发展规划(973计划)前期研究专项项目(2007CB216409)
浙江工业大学国家重点实验室培育基地开放基金()
出版年
2009
NETL
NSTL
维普
万方数据