锂离子电池负极硅-热解碳-石墨复合材料的制备及性能
Preparation and Performance of Silicon-Pyrolytic Carbon-Graphite Composite as Anode Material for Lithium-Ion Batteries
作者单位E-mail
杨学兵 江西省科学院应用物理研究所, 南昌 330029 xbyjz@163.com 
张林伟 江西省科学院应用物理研究所, 南昌 330029  
摘要: 以沥青为碳前驱物,通过加热分解法制备了具有不同热解碳含量的硅-热解碳-石墨复合材料,并测试及分析了材料的形貌、结构及电化学性能。结果表明,沥青质量在320~560℃的温度区间内迅速减小,沥青质量的减小是由于氢元素的去除。经过高温分解制得的热解碳与沥青的质量比率为65%。在硅-热解碳-石墨复合材料中,硅颗粒分散在石墨表面,热解碳覆盖在硅颗粒表面,热解碳增强了硅颗粒与石墨间的界面结合力。适当含量的热解碳增大了复合材料的放电比容量且改善了循环稳定性;过量的热解碳不能进一步提升复合材料的放电容量。
关键词: 锂离子电池  负极材料    石墨
基金项目: 国家青年科学基金项目(No.51701089)和江西省重点研发计划项目(No.20161BBH80061)资助
Abstract: Silicon-pyrolytic carbon-graphite composite with different content of pyrolytic carbon has been synthesized through pyrolysis. Pitch has been used as precursor of pyrolytic carbon. Morphology, structure and electrochemical performance of materials have been tested and analyzed. The results showed that the mass of pitch decreased rapidly from 320 to 560℃. The decrease of mass results from removal of hydrogen in pitch. Mass ratio between pyrolytic carbon and pitch was about 65% through pyrolysis process. In silicon-pyrolytic carbon-graphite composite, silicon particles were dispersed on the surface of graphite. Pyrolytic carbon covered silicon particles, and enhanced the interface adhesion between silicon particles and graphite. Appropriate content of pyrolytic carbon could increase the discharge capacity and improve the cycle stability of composite while excessive content of pyrolytic carbon could not further enhance discharge capacity.
Keywords: lithium-ion batteries  anode material  silicon  graphite
投稿时间:2018-10-10 修订日期:2018-12-19
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杨学兵,张林伟.锂离子电池负极硅-热解碳-石墨复合材料的制备及性能[J].无机化学学报,2019,35(3):537-545.
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