低温燃烧法合成富锂正极材料0.7Li_2MnO_3-0.3LiNiO_2  

Synthesizing Li-rich cathode material 0.7Li_2MnO_3-0.3LiNiO_2 via low-temperature combustion process

作　　者：李海明[1] 马真[1] 吴保明[1] 叶乃清[1] 

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

出　　处：《电池》2013年第3期147-150,共4页Battery Bimonthly

基　　金：国家级大学生创新创业训练计划项目(201210596001);广西区大学生创新创业训练计划项目(2012CLCX001);广西研究生教育创新项目(2011105960805M16)

摘　　要：以LiNO3、Ni(NO3)2.6H2O、Mn(NO3)2和尿素为原料,用低温燃烧法合成了富锂正极材料0.7Li2MnO3-0.3LiNiO2。通过XRD、SEM和充放电测试对合成产物的结构、形貌和电化学性能进行了分析,研究了合成条件对产物性能的影响。合成0.7Li2MnO3-0.3LiNiO2的最佳条件是:500℃点火,850℃下回火20 h。在此条件下合成的产物具有α-NaFeO2型层状结构、球状形貌;以0.1 C在2.5～4.6 V充放电,放电比容量可达218.7 mAh/g;以不同倍率充放电的循环性能良好。Li-rich cathode material 0. 7Li2 MnO34）. 3 LiNiO2 was synthesized via low-temperature combustion process using LiNO3 , Ni（ NO3 ） 2 · 6H： O, Mn （ NO3 ） 2 and urea as raw materials. The structure, morphology and electrochemical performance of product were analyzed by XRD, SEM and charge-discharge tests, the effects of synthesizing condition on the performance of product were studied. The optimum conditions to synthesize 0. 7Li2MnO34）. 3LiNiO2 were：igniting at 500 ℃, reheating at 850℃ for 20 h. The product synthesized under Such conditions had a-NaFeO2 -like layered structure, spherical morphology, when charged-discharged at 0. 1 C in 2.5 -4. 6 V,its specific discharge capacity could reach to 218. 7 mAh/g. When charged-discharged at different rates, it had fine cycle performance.

关 键 词：锂离子电池 富锂正极材料 0 7Li2Mn03-0 3LiNiO2 低温燃烧合成 

分 类 号：TM912.9[电气工程—电力电子与电力传动]