采用球磨湿混和旋转合成相结合的新工艺来制备锂离子电池正极材料ＬｉＭｎ２Ｏ４，并对制备的材料进行了粒度、化学成分以及电化学性能测试．制备的ＬｉＭｎ２Ｏ４为正尖晶石结构，而且物质纯净．同一批次制备的材料化学成分均匀，粉末粒度分布范围窄，中粒径为１０．６７μｍ，首次充电容量为１２４ｍＡｈ／ｇ，放电容量为１１５ｍＡｈ／ｇ．循环次数达３０次时，放电容量还大于１００ｍＡｈ／ｇ，循环稳定性良好．球磨湿混工艺能将原料混合均匀，并能有效地使原料粒度细化而且粒度均匀．旋转合成工艺能使反应物和反应产物的温度均匀、粒度均匀、晶型结构与成分均匀．球磨湿混和旋转合成相结合的固相合成新工艺能制备出电化学性能性能良好的ＬｉＭｎ２Ｏ４.
Wet ball-milling and rotating synthesizing were combined to form a new synthesis technology of cathode materials LiMn2O4 for lithium
ion battery. XRD results show that the prepared LiMn2O4 is pure with a spinel structure type. The LiMn2O4 powders have uniform chemical
composition and narrow particle size distribution. The first charge capacity and the discharge capacity of LiMn2O4 were 124mAh/g and 115mAh/g,
respectively. And the discharge capacity decayed to above 100 mAh/g after 30 charge and discharge cycles, indicating an excellent cycle
stability of the reversible capacity. The raw materials can be perfectly mixed uniformly with a uniform particle size distribution by using ball wet
milling. The temperature, particle size, crystal structure and chemical composition of the materials are homogenous during rotating sintering,
therefore, the final production LiMn2O4 has good electrochemical properties. The industrialization prospect of the new synthesis technology
is very attractive.
参考文献
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