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 ＬｉＰＦ６／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（Ｄ３）为 ２１３．７５ｍＡｈ／ｇ，第三次充、放电效率（η３）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．
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.
参考文献
| [1] | Yair Ein-Eli, Boris Markovsky, Doron Aurbach, et al. Electrochim. Acta, 1994, 39 (17): 2560--2561. [2] ISao kuribayashi, Mike Yokoyama, Masataka Yamashita. Proc. 7th Intern. Meeting on lithium batteries. Boston, May, 1994. 15--20. [3] 苏玉长. 原位X射线衍射法在电化学插脱层过程研究中的应用. 博士学位论文.?长沙: 湖南大学, 1998. [4] Aurbach D, Markorsky B, Shechter A, et al. J. Electrochem. Soc., 1996, 143 (12): 3809--3813. [5] Xue J S, Dahn J R. J. Electrochem Soc., 1995, 142: 3668. |
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