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 3D 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.
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