酚醛树脂炭包覆石墨材料作为锂离子电池负极材料的研究  

Study on materials prepared by coating carbon of phenol formaldehyde resin on graphite used as the negative electrode for lithium ion batteries

作　　者：杨瑞枝[1] 徐仲榆[2] 余迪华[2] 

机构地区：[1]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

出　　处：《粉末冶金材料科学与工程》2000年第1期58-63,共6页Materials Science and Engineering of Powder Metallurgy

摘　　要：以液相浸溃法在天然鳞片石墨(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1 mol/L LiPF_6/(EC+DEC)(1:1)电解液中的充、放电性能,并分析了工艺条件中最高热处理温度(T_max)对其充、放电性能的影响,实验结果表明,经T_max=900℃热处理的酚醛树脂炭包覆石墨材料的第3次稳定放电容量(D_3)为213.75 mA·h/g,第3次充、放电效率(η_3)为88.69％,循环寿命达800次以上,可作为高性能锂离子电池的负极材料。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 1 mol/L LiPF_6/(EC+ DEC)( 1 : 1) electrolyte solution was investigated by means of the galvanostatic charging-discharging experiments and the cyclic vohammetry experiments. The influence of the maximum heat treatment temperatures (T_(max)) on the charging-discharging behaviour of this kind of 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 ( D_3 ) is 213.75 mA' h/g, the third cycling efficiency ( η3 ) is 88.69%, and the cycling life is more than 800 times. It can be used as the negative electrode for the high-performance lithium ion batteries.

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 

分 类 号：TM911[电气工程—电力电子与电力传动]