低温电解法制备球形尖晶石LiMn_2O_4及性能研究  

Preparation and Properties of Spherical Spinel LiMn_2O_4 Cathode by Electrolysis at Low Temperatures

作　　者：周园[1] 岳鸿飞[1] 冉广芬[1] 

机构地区：[1]中国科学院青海盐湖研究所,青海西宁810008

出　　处：《稀有金属材料与工程》2007年第8期1477-1479,共3页Rare Metal Materials and Engineering

基　　金：中国科学院"西部之光"人才培养计划(2004年度);青海省2002年度科技攻关项目(2002-G-102)

摘　　要：采用MnSO4-H2SO4混合溶液作电解液,高纯铅板作电极,控制电解池温度为0～10℃,低温电解制取球形MnO2微粒;将其用一定浓度硝酸锂溶液浸渍,经过520℃低温合成、760℃高温结晶获得球径较为均一的球形尖晶石锰酸锂锂离子电池正极材料。通过XRD和SEM对其进行了相结构表征和表面形貌观察。组装试验电池,测得材料初始容量约为105mAh.g-1,6次循环放电后循环过程趋于稳定,第30次循环充电容量保持在98.1mAh.g-1,放电容量保持在95.0mAh.g-1,表现出良好的充放电循环性能。The preparation and properties of spherical spinel LiMn2O4 cathode by electrolysis at low temperatures have been studied in this paper. Firstly, the spherical MnO2 was prepared by using the mixed solution of MnSO4 and H2SO4 as electrolytes and the lead plate of high purity as electrode. The temperature of electrolytic cell is controlled at 0-10℃. Then, the MnO2 is dipped into LiNO3 solution of certain concentration. At last, the homogeneous spherical spinel lithium manganese oxide LiMn2O4 is synthesized at a low temperature of 520 ℃ and crystallized at a high temperature of 760 ℃ as cathode for lithium ion battery. The elementary structure and surface characteristics are analyzed by XRD and SEM, respectively. The results of assembly battery showed that the initial capacity is about 105 mAh·g^-1, and tends to be stable after 6 cycles. It keeps at 98.1 mAh·g^-1 for charging and 95.0 mAh·g^-1 for discharging, respectively, after 30 cycles, indicating the excellent cycle stability.

关 键 词：低温电解 球形尖晶石LiMn2O4 正极材料 锂离子电池 

分 类 号：TM910.4[电气工程—电力电子与电力传动]