阴极材料正尖晶石LiMn_2O_4制备方法研究现状

Research status on synthesis of spinel LiMn _ 2O_ 4 cathode material

综述了制备锂离子电池正极材料正尖晶石ＬｉＭｎ２Ｏ４ 的几种常用方法及其各自特点。对于高温固相反应而言，阐述了原料及合成条件的选择方式，并讨论了焙烧温度、升降温方式及机械研磨对产物晶型结构、粒度大小分布和电化学性能的影响，提出合成温度是控制固相合成正尖晶石ＬｉＭｎ２Ｏ４ 的关键因素，直接影响产物的结构、粒度、杂质含量；对于低温合成技术，介绍了通过控制制备前体的反应条件及其转化正尖晶石ＬｉＭｎ２Ｏ４ 焙烧温度，来优化材料的组成、结构形貌，提高产物均匀性和电化学性能的途径，认为发展尖晶石ＬｉＭｎ２Ｏ４

Synthesis of spinel LiMn 2O 4 for Li ion battery and their characteristics were summarized. The selection mode of raw materials and the composition condition were explained and the effects of annealing temperature, mode of increasing/decreasing temperature and mechanical milling on the structure morphology, particle size and electrochemical property of the product were discussed concerning the hightemperature solid phase reaction. The results show that the composition temperature is the key factor that influences the structure, particle size and impurity content of the product. To the low temperature composition technique, the method of optimizing composition and structure form of the product and the way of increasing homogeneity and electrochemical property of the product by controlling the reaction temperature of the precursor preparation and the annealing temperature for its transform action into spinel LiMn 2O 4 were introduced. The prerequisite of developing the low temperature technique for preparing LiMn 2O 4 is to search for the reaction system and the condition of the suitable precursor preparation.