表面氧化改性中间相炭微球用于锂离子动力电池负极材料的研究  

THE STUDIES ON ELECTROCHEMICAL PERFORMANCE OF MODIFIED MESOCARBON MICROBEADS BY OXIDATION METHODS FOR LI-ION POWER BATTERY

作　　者：王红强[1] 李庆余[1] 韦卉[1] 黄有国[1] 钟玉兰[1] 颜志雄[1] 

机构地区：[1]广西师范大学化学化工学院,广西桂林541004

出　　处：《金属材料与冶金工程》2007年第1期6-9,共4页Metal Materials and Metallurgy Engineering

基　　金：广西壮族自治区学位授权点学科建设专项经费资助项目(2000507018);广西师范大学博士启动基金项目(2004-13)

摘　　要：采用表面氧化对中间相炭微球进行改性,在电化学工作站上研究其电化学性能,结果表明,表面氧化得到的炭微球放电容量高达361.5mAh.g-1,接近于石墨的理论容量;在2C放电电流下的放电容量是0.1C放电电流下的放电容量的96.6%,比未经处理的中间相炭微球高出6.1%。锂在表面氧化后的中间相炭微球试样中的扩散系数为未进行表面氧化处理的中间相炭微球试样的4倍。以表面氧化处理过的中间相炭微球为负极的12Ah锂离子动力电池具有良好的脉冲放电性能和循环性能,在放电90%的情况下仍能提供160W的脉冲放电功率,500次循环后具有90%以上的容量保持率。The electrochemical performance of modified MCMBs by surface oxidation has been studied. It is found that oxidation MCMBs have higher discharge capacity 361.5 mAh·g^-1 and the discharge capacity at 2C discharge current is 96.6% of that at 0.1C discharge capacity. It is 6.1% higher than the discharge capacity of untreated MCMBs at the same condition. Diffusion coefficient of lithium ion insertion into MCMBs was investigated by chronoamperometry method. Experimental results showed that the Li- ion diffusion coefficients in oxided MCMBs be 4 times of that in untreated MCMBs. 12 Ah Li - ion Battery with oxidation MCMBs as anode has excellent pulse discharge performance and cycle ability, which can supply 160W pulse discharge power at 90% discharge capacity and holding 〉90% discharge capacity after 500 cycles.

关 键 词：锂离子动力电池 中间相炭微球 表面氧化 脉冲放电 

分 类 号：TQ127.1[化学工程—无机化工]