【作者】 郭华军； 李新海； 张宝； 王志兴； 彭文杰； 郭永兴；

【Author】 Guo Huajun~*, Li Xinhai, Zhang Bao, Wang Zhixing, Peng Wenjie, Guo Yongxing (College of Metallurgical Science and Engineering, Central South University, Changsha 410083, China)

【机构】 中南大学冶金科学与工程学院；

【摘要】 以酚醛树脂为前驱体制各锂离子电池负极用热解炭材料。采用热失重分析方法研究了酚醛树脂在热处理过程中的变化。采用XRD、BET及电化学方法研究了所得热解炭材料的结构与性能。随着热解温度升高和恒温时间增加,所得热解炭材料的结构有序性增加,比表面积减小,首次充电容量和放电容量均减少,充放电效率增大。其中1050℃下恒温2小时所得热解炭材料的电化学性能较好,首次充电容量、放电容量和充放电效率分别为560mAh/g、387mAh/g、69.1%。更多还原

【Abstract】 Carbon anode for Li-ion batteries is prepared by pyrolysis of phenol resin at high temperature. Reactions occurred in the process of heat-treatment are determined by thermal gravimetric analysis (TGA). The structure and characteristics of the carbon materials is studied in details by means of X-ray diffraction (XRD), Brunauer-Emmer-Teller (BET) surface area analysis and electrochemical measurements. As the temperature of pyrolysis and the soak time increasing, the carbon materials become more stacked, the specific surface area reduces, both reversible capacity and irreversible capacity decrease, the initial coulumbic efficiency increases. The carbon pyrolyzed at 1050℃ for 2 hours shows good electrochemical performances, whose initial charge capacity, discharge capacity, initial coulumbic efficiency is 560mAh/g, 387mAh/g and 69.1%, respectively.更多还原