固相熔融盐法合成LiNiO_2粉体及其电化学性能  

PREPARATION OF LiNiO_2 BY SOLID STATE REACTION AND ITS ELECTROCHEMICAL PERFORMANCE

作　　者：常照荣[1,2] 齐霞[3] 吴锋[1] 汤宏伟[3] 徐秋红[3] 

机构地区：[1]北京理工大学化工与环境工程学院 [2]河南师范大学化学与环境科学学院,河南新乡453007 [3]河南师范大学化学与环境科学学院

出　　处：《硅酸盐学报》2006年第3期329-333,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(90206043)资助项目。

摘　　要：用固相法与熔融盐法相结合的新工艺，制备了锂离子电池正极材料LiNiO2。在空气中，对LiNO2＋LiOH的熔融盐混合物和Ni（OH）2的混合粉体进行了差热-热重分析，研究了时间、生长后热处理等因素对产物结构的影响。X射线衍射分析表明：制得的LiNiO2具有α—NaFeO2结构且晶型完整。电性能测试表明：在0．5mA／cm^2的充放电电流密度和2．7～4．2V的电压范围内，放电比容量可达150．2（mA·h）／g，Coulomb效率达82．9％，循环20次后，放电比容量仍达126．6（mA·h）／g。结果表明：采用此工艺，能制备出电化学性能良好的LiNiO2正极材料。Cathode material LiNiO2 for lithium ion batteries was prepared by a novel technique of a solid state reaction combined with the melting salt method. The mixed powders of LiNO3 ＋LiOH and Ni（OH）2 melting salt were analyzed in air by thermogravimetric- differential thermal analysis. The effects of the preparation conditions such as reaction time, heat treatment, etc. on the structure of products were studied. X-ray diffraction results show that the prepared LiNiO2 under the optimum conditions has a perfect structure of α - NaFeO2. Electrochemical performance tests show that when the charge - discharge current density is 0.5 mA/cm^2 and the charge - discharge voltage is 2.7-4.2 V, the initial discharge specific capacity of the LiNiO2 reaches 150.2 （mA ·h）/g. The efficiency of coulomb is 82.9%. The discharge specific capacity remains 126.6 （mA ·h）/g after 20 cycles. The results indicate that this technique can be used to prepare cathode material LiNiO2 with good electrochemical properties.

关 键 词：锂离子电池 固相反应 熔融盐 正极材料 镍酸锂 

分 类 号：TM911[电气工程—电力电子与电力传动]