xLi_2MnO_3-(1-x)LiNi_(0.7)Co_(0.3)O_2的低温燃烧合成及电化学性能研究  

Low Temperature Combustion Synthesis and Electrochemical Performance of xLi_2MnO_3-(1-x)LiNi_(0.7)Co_(0.3)O_2

作　　者：吴保明[1] 叶乃清[1,2] 马真[1] 韩建峰[1] 徐东[1] 

机构地区：[1]桂林理工大学材料科学与工程学院,桂林541004 [2]有色金属及材料加工新技术教育部重点实验室,桂林541004

出　　处：《无机化学学报》2013年第9期1835-1841,共7页Chinese Journal of Inorganic Chemistry

基　　金：广西自然科学基金(No.0832256);广西研究生教育创新计划(No.2011105960805M16)资助项目

摘　　要：采用低温燃烧法合成了锂离子电池正极材料xLi2MnO3-(1-x)LiNi0.7Co0.3O2,对合成产物的结构、形貌和电化学性能进行了系统的研究,通过单因素试验对合成条件和材料的组成进行了优化。结果表明:采用低温燃烧法合成的富锂层状正极材料具有α-NaFeO2型层状结构、球状形貌和良好的电化学性能;其最佳合成条件为:回火温度850℃,回火时间20 h;Li2MnO3的最佳配比为x=0.7。在此条件下合成的0.7Li2MnO3-0.3LiNi0.7Co0.3O2,最高放电比容量达到263.1 mAh.g-1,并具有良好的循环性能和倍率性能。The cathode materials for lithium ion batteries xLi2MnO3-（1-x）LiNi0.3Co0.3O2 were prepared via low temperature combustion process. The structure, morphology and electrochemical performance of the synthesized materials were studied systematically. The optimal preparing conditions and the optimal ratio of Li2MnO3 for the cathode materials were studied by single factor experiment. The experimental results show that the synthesized products have α-NaFeO2layered structure, sphere-like morphology and excellent electrochemical performance; the optimal conditions to prepare these materials are to reheat the combustion products at 850 ℃ for 20 h, the optimal ratio of Li2MnO3 is x =0.7. The cathode material 0.7Li2MnO3-0.3LiNi0.7Co0.302 synthesized under such conditions has the highest discharge capacity of 263.1 mAh. g-1, excellent cycle and rate performance.

关 键 词：锂离子电池 正极材料 xLi2MnO3-(1-x)LiNi0 7Co0 3O2 低温燃烧合成 

分 类 号：TM912.9[电气工程—电力电子与电力传动]