无机材料学报

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树脂炭包覆石墨作为锂离子电池负电极的研究

杨瑞枝1; 张东煜1; 张红波1; 徐仲榆2; 余迪华2; 何月德2   

  1. 1. 中南工业大学粉末冶金研究所粉末冶金国家重点实验室, 长沙 410083; 2. 湖南大学新型炭材料研究所, 长沙 410082
  • 收稿日期:1999-11-10 修回日期:1999-12-21 出版日期:2000-08-20 网络出版日期:2000-08-20

Study on Materials Prepared by Coating Carbon of Resin on Graphite Used as the Negative Electrode for Lithiusm Ion Batteries

YANG Rui-Zhi1; ZHANG Dong-Yu1; ZHANG Hong-Bo1; XU Zhong-Yu2; YU Di-Hua2; HE Yue-De 2   

  1. 1.National Key Laboratory for Powder Metallurgy; Central South University of Technology; Changsha 410083; China; 2. Institute of New Carbon Materials; Hunan University; Changsha 410082, China
  • Received:1999-11-10 Revised:1999-12-21 Published:2000-08-20 Online:2000-08-20

摘要: 以液相浸渍法在天然鳞片石墨(NFG)表面包覆酚醛树脂后进行热处理,制备了酚醛树脂炭包覆石墨材料.将这种材料作为锂离子电池的负极材料,运用恒电流充、放电法,粉末微电极循环伏安法考察了其在1M LiPF/EC+DEC(1:1)电解液中的充、放电性能,并分析了工艺条件中不同热处理温度(HTT)对其充、放电性能的影响.实验结果表明,经HTT=900℃热处理的酚醛树脂炭包覆石墨材料的第三次稳定放电容量()为 213.75mAh/g,第三次充、放电效率(η)为88.69%;并且循环寿命较长,可作为高性能锂离子电池的负极材料.

关键词: 锂离子电池, 负电极, 天然鳞片石墨, 酚醛树脂炭, 包覆, 充、放电性能

Abstract: The materials were prepared by coating the phenol formaldehyde resin on the surface of the natural flake graphite (NFG) powders using liquid-phase-
impregnation and pyrolysis. The charging-discharging performance of the materials used as the negative electrode for lithium ion batteries in
1M LiPF6/EC+DEC(1:1) electrolyte solution was investigated by means of the galvanostatic charging-discharging experiments and the cyclic
voltammetry experiments. The influence of different heat treatment temperatures (HTT) on the charging-discharging behaviour of the materials
was discussed. The results show that the charging-discharging characteristics of the material heat-treated under 900℃ are as
follows: the third stable discharging capacity(D3) is 213.75mA·h/g, the third cycling efficiency (η3) is 88.69%, and the cycling
life is long. It can be used as the negative electrode for the high-performance lithium ion batteries.

Key words: lithium ion batteries, negative electrode, natural flake graphite(NFG), carbon of phenol formaldehyde resin, coating, the charging-discharging performance

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