溶胶-凝胶法制备尖晶石型LiMn_2O_4正极材料

采用溶胶-凝胶法制备了锂离子电池正极材料锂锰氧化物。以Mn(NO3)2(50%)、LiOH·2H2O为原料,以柠檬酸为螯合剂制得前驱体,400℃预烧6h,再经750、850℃分别焙烧并保温6h得到粉体产物。XRD分析表明,所合成的产物为尖晶石型LiMn2O4;SEM观察结果表明,合成产物颗粒均匀,形貌规则。用其组装的电池经恒电流充放电测试,表明其初始比容量可达118.76mAh/g,具有良好的循环性能。

Preparation of Spinel LiMn2O4 for Cathode Materials by Sol-gel Method

Lithium manganese oxide,a type of cathode materials for Li-ion battery was prepared by sol-gel method,using Mn(NO3)2(50%),LiOH· 2H2O as raw materials and citric acid as the chelating agent. The precursor was preheated at 400 ℃ for 6 h,and then calcined at different temperature of 750,850 ℃ for 6 h to obtain the powder. The as-prepared sample was confirmed to be spinel LiMn2O4 by X-ray diffraction(XRD). Scanning electron microscope(SEM)images showed that the powder mainly consisted of rod-shape particles with uniform particle sizes. The electrochemical properties of the sample were evaluated with charge and discharge tests. The specific capacity of the LiMn2O4 cathode materials was 118.76 mAh/g which indicated a good cycling performance.