Mild oxidation treatment of graphite anode for Li-ion batteries^①

来源期刊：中南大学学报(英文版)2005年第1期

论文作者：郭华军 李新海 王志兴 彭文杰 郭永兴

文章页码：50 - 54

Key words：graphite; anode; lithium ion battery; capacity

Abstract: The graphite was modified by mild oxidation, and the effects of modification temperature and soaking time on the characteristics of graphite were investigated. The structure and characteristics of the graphite were determined by X-ray diffraction, scanning electron microscopy, BET surface area, particle size analysis and electrochemical measurements. The results show that the modified graphite has a better-developed crystallite structure,larger average particle diameter, smaller surface area, and better electrochemical characteristics than the untrented graphite. The sample mild-oxidized at 600℃for 3 h has the best electrochemical performances with a reversible capacity of 304.5 mA·h/g, a irreversible capacity of 66.4 mA·h/g, and a initial coulombic efficiency of 82.1%. The charge/discharge properties and a cycling stability of the prototype lithium ion batteries with modified graphite as anodes are improved. Its capacity retention ratio at the 200th cycle is enhanced from 66.75% to 90.15%.