锂离子电池正极材料LiNi_(0.8)Co_(0.2)O_2和LiNi_(0.95)Ce_(0.05)O_2制备工艺优化  

Optimum Preparation Conditions of LiNi_(0.8)Co_(0.2)O_2 and LiNi_(0.95)Ce_(0.05)O_2 as Lithium-Ion Battery Cathode Materials

作　　者：豆志河[1] 张廷安[1] 侯闯[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《中国稀土学报》2004年第5期651-655,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金资助项目(59971016)

摘　　要：通过L9(34)拉丁正交实验,利用极差分析法对制备LiNi0.8Co0.2O2的反应条件进行优化,找出了合成LiNi0.8Co0.2O2的最佳工艺,固相分段法制备LiNi0.8Co0.2O2的过程中,反应物摩尔比、氧气压力、恒温时间及最终合成温度依次为主要影响因素。尝试把氧气压力作为独立因素进行考察,进一步优化了合成工艺。采用同样方法尝试研究了添加Ce合成了电化学活性较高LiNi0.95Ce0.05O2派生物正极材料。实验电池电化学测试表明LiNi0.8Co0.2O2和LiNi0.95Ce0.05O2初始放电比容量分别为165,148mAh·g-1,放电平台均在9h以上。The preparation of LiNi_(0.8)Co_(0.2)O_2 was discussed by the multiply sintering method for solid reaction, in which the sintered material was smashed, ground and pelletted between two successive sintering steps. The optimum technological condition was obtained through orthogonal experiments by L_9(3~4) and DTA analysis. The result indicates that the factors of effecting the electrochemical properties of synthesized LiNi_(0.8)Co_(0.2)O_2 are molar ratio of Li/Ni/Co, oxygen pressure, homothermal time, the final sintering temperature in turn according to its importance. The oxygen pressure is reviewed independently and the technological condition is further optimized. With the same method, rare earth element Ce was studied as substitute element of Co and the cathode material of LiNi_(0.95)Ce_(0.05)O_2 with excellent electrochemical properties was prepared. The electrochemical testing results of LiNi_(0.8)Co_(0.2)O_2 and LiNi_(0.95)Ce_(0.05)O_2 experimental batteries show that discharge capacities of them reach 165 and 148 mAh·g^(-1) respectively and the persistence is more than 9 h at 3.7 V.

关 键 词：能源材料 锂离子电池 正极材料 LINI0.8CO0.2O2 LiNi0.95Ce0.05O2 固相分段法 稀土 

分 类 号：TM912.2[电气工程—电力电子与电力传动]