新型碳热还原法制备LiFePO_4/C的电极过程  

Electrode process of LiFePO_4/C composite cathode materials by a novel carbothermal reduction method

作　　者：刘素琴[1] 龚本利[1] 黄可龙[1] 张戈[1] 李世彩[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《电源技术》2007年第5期382-385,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金资助项目(20376085);教育部博士点资助项目(20030533001)

摘　　要：以葡萄糖为碳源,采用一种新的碳热还原法制备LiFePO4/C正极材料。采用X射线衍射(XRD)、扫描电镜(SEM)等对产物的结构和形貌进行了表征,同时通过循环伏安和交流阻抗等手段研究了LiFePO4/C电极中锂离子的脱嵌过程。结果表明,由循环伏安法计算得到的锂离子的平均扩散系数D0=1.20×10-12cm2·s-1;而交流阻抗测试表明,LiFePO4的电荷转移电阻(Rct)随电极电位变化,在电位平台附近有一个最小值。LiFePO4/C composite cathode materials were synthesized by a novel carbothermal reduction （CTR） method using glucose as carbon resource. The product characterization of the structure and morphology of the product were studied by XRD and SEM, respectively. The process of intercalation and removal of Li-ion were investigated by cyclic voltammetry and AC impedance method. The average diffusion coefficient of Li-ion （Do） is 1.20 × 10^-12 cm2· s^-1 and charge-transfer resistance （Rct） is dependant on potential and has a minimum value close to plateau.

关 键 词：锂离子蓄电池 正极材料 LIFEPO4 碳热还原法 电极过程 

分 类 号：TM912.9[电气工程—电力电子与电力传动]