SYNTHESIS OF LITHIUM-MANGANESE OXIDES AS A CATHODE FOR LITHIUM SECONDARY BATTERIES.

采用熔体浸渍法制备了锂二次电池正极材料(锂锰氧化物)。主要研究了两类材料：1)尖晶石LiMn_2O_4和2)Li_&lt；0.33&gt；MnO_&lt；结果表明，LiNO_3和LiOH两种锂化合物均可用于熔体浸渍。在研究过程中，阐明了熔体浸渍法具有以下优良特性，使我们能够制备出各种用途的理想陶瓷材料。A)产品的成分易于控制。B)产品的粒度可以通过原料的选择来控制。C)产品的比表面积可以控制。D)产物的出钢密度可以控制，循环过程中化学计量比的LiMn2O4转变为可充电容量为120mAhg的稳定化合物。结果表明，化学计量比LiMn2O4是锂离子电池正极材料。

We have developed the preparation procedures of cathode materials(Lithium Manganese oxides)for lithium secondary batteries by melt-impregnation method developed by us. Two types of materials, 1)spinel LiMn_2O_4 and 2)Li_<0.33>MnO_<2'> were mainly studied. It is found that two types of lithium compounds, LiNO_3 and LiOH,are available to the melt impregnation method. In the course of study, it is clarified that the melt-impregnation method has following excellent features, which allow us to prepare desirable ceramic materials used for various purpose. a)Composition of product is controlled easily. b)Particle size of product can be controlled by the selection of raw material. c)Specific surface area of product can be controlled. d)Tapping density of product can be controlled.We have also found that stoichiometric LiMn_2O_4 is transformed to stable compound with rechargeable capacity of 120 mAh/g during the cycling. It shows that stoichiometric LiMn_2O_4 is useful materials as a cathode of Lithium-Ion batteries.