中间相碳微球改性的正极材料LiMn_2O_4性能研究  

Performance study of cathode material LiMn_2O_4 modified by C

作　　者：巩桂英[1] 徐宇虹[1] 马萍[1] 张宝宏[1] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001

出　　处：《电子元件与材料》2007年第9期47-50,共4页Electronic Components And Materials

基　　金：哈尔滨工程大学基础研究基金资助项目(HEUF04064)

摘　　要：采用柠檬酸络合法制备中间相碳微球(Mesocarbon microbeads,以下用C表示)改性的LiMn2O4。通过X射线衍射、循环伏安、电化学阻抗、充放电测试对模拟电池性能进行了测试。结果表明:C的加入有助于Li+在正负极之间嵌入和脱嵌,其中w(C)为3%时效果最好,首次放电容量达128.82mAh/g,经过30次循环后的比容量为119.58mAh/g,说明C加入增大了比容量,稳定了其循环性能。The C-modified LiMn2O4 was synthesized by citric acid method and characterized by X-ray diffraction, cyclic voltammetry （CV）, electrochemical impedance spectroscopy （EIS） and constant current charge/discharge. Obtained results show that the addition of C is favorable for Li^＋ insertion and extraction. The samples with 3 % C （mass fraction） reveal better performance, giving initial discharge capacity of 128.82 mAh/g and remain specific capacity of 119.58 mAh/g after 30 cycles. The results indicate that the better cycling property is brought by addition of C.

关 键 词：无机非金属材料 锂离子电池 LIMN2O4 改性 正极材料 

分 类 号：TM912.9[电气工程—电力电子与电力传动]