微米级锂离子电池正极材料尖晶石LiMn_2O_4的合成及性能  

Synthesis and Performance of Micron Spinel LiMn_2O_4 as Cathode Material for Lithium Ion Batteries

作　　者：吴晓梅[1] 杨春生[2] 奚峻[1] 吴益华[1] 

机构地区：[1]上海交通大学化学化工学院,上海200240 [2]上海交通大学微纳米科学技术研究院,上海200240

出　　处：《复旦学报（自然科学版）》2004年第4期524-529,共6页Journal of Fudan University：Natural Science

基　　金：国家自然科学基金资助项目(50075055)

摘　　要：对微米级和常规固相反应方法制备的锂离子电池正极材料尖晶石LiMn2O4的结构和性能进行了比较,并采用扫描电子显微镜(SEM),X 射线衍射(XRD)及慢扫描循环伏安(SSCV)、交流阻抗(EIS)的电化学测试方法对材料进行了表征.结果表明微米级的尖晶石LiMn2O4,颗粒均匀,晶体结晶性好;在10次慢扫描循环伏安曲线中,容量衰减相对较小;从材料的交流阻抗谱中可看出,随着循环的进行,靠近循环伏安峰电位附近的电荷转移电阻变化小.The structure and the performance of micron spinel LiMn_2O_4 to the spinel synthesized by the normal solid-state method were compared. Scanning electron microscope (SEM), X-rays diffraction (XRD), slow scan rate cyclic voltammetry (SSCV), and electrochemical impedance spectroscopy(EIS) were applied in order to study the particle size, the structure, the potentiodynamic behavior, and the impedance. It was found that the micron spinel LiMn_2O_4 was unifrom and well-defined crystal. The specific capacity of it was fade slowly after ten cycles of SSCV. It was also compared that impedance spectra of the pristine and cycled electrodes, measured at potentials close to the SSCV peak potential, in which the charge-transfer resistance changed little.

关 键 词：微米级锂离子电池 正极材料 尖晶石 LIMN2O4 合成 循环伏安 

分 类 号：TM911.14[电气工程—电力电子与电力传动]