摘要
以正辛烷为相转移剂,采用相转移法合成了锰酸锂前驱体,在电炉中于不同的升温速率下制得电池正极材料粉体,用XRD、SEM进行结构形态分析.当n(Li)∶n(Mn)=1.1∶2时所合成样品前驱体以5 K/m in的升温速率在750℃焙烧8 h,所制备的样品材料结构稳定且呈尖晶石型物相,粒度分布较均匀、形貌规整,无明显团聚现象.用其组装的锂离子电池,在以0.1 C充电、限制电压4.2 V,再以0.1 C放电、终止电压3.0 V的放电制度下,首次放电比容量达127 mAh/g,工作电位平稳于3.8 V,样品电极可逆循环性能良好.
Spinel lithium manganese oxide precursor is synthesized by phase transfer method and heated at different rate in fast heating-up furnace. In the experiment using X-ray diffraction and scanning electron microscopy, the precursor was prepared at mol ratio n（Li）： n（Mn） =1.1：2, and heated at 5 K/min, 750 ℃ for 8 h. The sample material has better structure stability and perfect crystalline phase. Being charged to 4. 2 V with the current of 0. 1C, then discharged to 3.0 V at the same current, the initial discharging capacity reaches 127 mAh/g with the average voltage at 3.8 V, and cycling performance is excellent.
出处
《桂林工学院学报》
北大核心
2007年第3期374-377,共4页
Journal of Guilin University of Technology
基金
广西自然科学基金资助项目(桂科基0342004-2)
关键词
锰酸锂
正极材料
相转移法
升温速率
电化学性能
phase transfer method
heating-up rate
lithium manganese oxide
cathode material
electrochemical performance
