沈丁,杨绍斌,张淑凯,薛维华

• 1:辽宁工程技术大学资源与环境工程学院
• 2:辽宁工程技术大学材料科学与工程学院

摘要(Abstract)：

以原子比为1∶1的Co与Sn金属粉为原料,采用球磨法制备了锂离子电池负极Sn-Co合金,研究了其形成机理及可逆储锂性能。结果表明,球磨先形成CoSn3和CoSn2等中间相,最后形成CoSn2相,继续球磨,CoSn2相的晶粒尺寸先逐渐减小后趋于稳定。晶粒的细化有利于提高合金的首次可逆容量和循环性能,球磨50 h后,首次可逆容量接近最大值,为426 mAh/g,30次循环后容量保持率为67.1%。热处理后,物相转变为CoSn相,提高了合金的循环性能,30次循环后容量保持率为73.7%,但热处理过程中晶粒和颗粒的长大使首次可逆容量降低。

关键词(KeyWords)： 锂离子电池;Sn-Co;球磨;热处理;电化学性能

Abstract:

Keywords:

基金项目(Foundation): 辽宁省自然科学基金(20072206)

作者(Author): 沈丁,杨绍斌,张淑凯,薛维华

DOI: 10.13289/j.issn.1009-6264.2010.12.029

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