硅/碳/碳纳米管复合负极材料的电化学性能
Electrochemical Performance of Si / Carbon / Carbon Nano-tube Composite Anode Materials for Lithium-ion Battery
栾振兴, 许云华, 周志斌, 燕映霖
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作者单位：(西安建筑科技大学 材料科学与工程学院, 陕西 西安 710055)
中文关键字：锂离子电池； 沥青； 硅； 碳纳米管
英文关键字：lithium ion battery; pitch; Si; carbon nano-tube
中文摘要：采用高温裂解沥青、纳米硅和超声酸化处理的碳纳米管混合物，制备了锂离子电池负极复合材料硅/碳/碳纳米管。测试表明复合材料首次放电比容量高达1077 mAh/g，经过20个循环后可逆容量仍高达703 mAh/g。碳纳米管在碳基体中形成的网状结构使复合材料在循环过程中保持较好的稳定形貌。
英文摘要：The anode material of silicon / carbon / carbon nano-tubes (Si / C / CNTs) was prepared by pyrolyzing the pitch mixture with silicon (Si) and carbon nano-tubes (CNTs). The electrochemical testing results show that a discharge capacity of 1077 mAh/g of the Si / C / CNTs composite is obtained during the first cycle, and a charge capacity of 703 mAh/g still retains after charge-discharge cycles for 20 times. The good electrical conductive and resilient network formed by the CNTs in the carbon matrix can keep stable morphology of the composite during charge-discharge cycle.