硅/碳纳米管/碳复合材料的制备及其电化学性能研究  

Preparation and electrochemical property of Si/CNT/C composite

作　　者：孟奇[1,2,3] 张英杰 董鹏[1,2,3] 张义永 李坤[4] Meng Qi;Zhang Yingjie;Dong Peng;Zhang Yiyong;Li Kun(Faculty of Metallurgy and Energy Engineering,Kunming University of Science and Technology,Kunming 650093;National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology,Kunming University of Science and Technology,Kunming 650093;Key Laboratory of Advanced Battery Materials of Yunnan Province,Kunming University of Science and Technology,Kunming 650093;Hefei Guoxuan Gaoke Power Energy Co.,Ltd.,Hefei 230011)

机构地区：[1]昆明理工大学冶金与能源工程学院,昆明650093 [2]昆明理工大学锂离子电池及材料制备技术国家地方联合工程实验室,昆明650093 [3]昆明理工大学云南省先进电池材料重点实验室,昆明650093 [4]合肥国轩高科动力能源有限公司,合肥230011

出　　处：《化工新型材料》2020年第10期101-105,114,共6页New Chemical Materials

基　　金：昆明理工大学高层次人才引进科研启动项目;国家自然科学基金(51764029);云南省应用基础研究计划(2018FB087)。

摘　　要：硅负极材料具有高理论比容量和较低锂化电位,被认为是最有应用潜力的锂离子电池负极材料之一。但硅负极材料导电性差、体积效应显著,因此其商业化应用受到限制。选用具有高导电性、高机械强度的多壁碳纳米管,利用简便、易操作的球磨方法制备了具有三维导电网络的硅/碳纳米管/碳复合材料。采用扫描电子显微镜、X射线衍射仪、电池测试系统对复合材料的微观形貌、结构及电化学性能进行了分析和测试。结果表明,硅/碳纳米管/碳复合材料中球磨纳米硅分布均匀,具有稳定的导电网络并表现出优异的电化学性能。因此,球磨法制备硅/碳纳米管/碳复合材料具有潜在的商业化应用价值。Silicon anode is considered as one of the most potential candidate materials for lithium ion batteries due to its high theoretical specific capacity and low lithium potential.However,the commercial application of silicon negative electrode is seriously hindered because of its poor conductivity and remarkable volume effect.Multi-wall carbon nanotubes(MWCNTs)with high electrical conductivity and mechanical strength were used to construct Si/CNT/C composites with 3 D conductive network by a simple and easy-to-operate ball milling method.Base on a series of analyses,it indicated that the ball-milled nano-silicon in Si/CNT/C was evenly distributed,had a stable conductive network,and exhibited excellent electrochemical performance.Therefore,the Si/CNT/C prepared by this method had potential commercial applications.

关 键 词：锂离子电池 硅负极 硅/碳纳米管/碳复合材料 球磨 

分 类 号：TQ152[化学工程—电化学工业]