热解碳包覆 CoSb_3作为锂离子电池负极材料的研究  

Study on Pyrolytic Coke Coated CoSb_3 as an Anode Material for Lithium-Ion Batteries

作　　者：邓龙征[1] 曹高劭[1] 谢健[1] 赵新兵[1] 

机构地区：[1]浙江大学材料系,杭州310027

出　　处：《材料导报》2004年第6期99-101,共3页Materials Reports

基　　金：基金项目:高校博士点基金(20010335045)

摘　　要：CoSb_3 合金具有较高的电化学嵌放锂容量。为缓解充放电过程中体积变化引起的容量衰退,制备了热解碳包覆 CoSb_3合金粉末负极材料,并对其电化学充放电性能进行了研究。实验结果表明,热解碳包覆 CoSb_3负极材料的电化学性能虽然尚不能满足实际应用要求,但与纯 CoSb_3合金负极材料相比,首次可逆容量和循环稳定性都有明显的提高。进一步降低 CoSb_3合金的粉末粒度,优化热解碳对合金粉末的包覆完整性,可进一步改善热解碳包覆 CoSb_3负极材料的电化学性能。Intermetallic compound CoSb_3,with a high electrochemical capacity,is a potential anode materialfor lithium-ion batteries.To reduce the capacity fading caused by the volume change of the compound during cycling,a composite of CoSb_3 powder coated with pyrolytic coke was prepared and studied as an anode material for lithium-ionbatteries.It was shown that both reversible capacity and cycling stability of the coke coated CoSb_3 composite havebeen significantly improved in comparison with CoSb_3 compound,although the present electrochemical performance ofthe composite cannot meet the requirements of practical application of lithium-ion batteries.However,it is suggestedthat the electrochemical properties of the coke coated CoSb_3 composite could be further improved by decreasing theparticle sizes of CoSb_3 powder and enhancing the coating of pyrolytic coke around CoSb_3 powder.

关 键 词：锂离子电池 负极材料 CoSb3合金 包覆 

分 类 号：TM912[电气工程—电力电子与电力传动]