【作者】 李燕； 赵煜娟； 刘欣燕； 夏定国；

【Author】 LI Yan, ZHAO Yu-juan, LIU Xin-yan, XIA Ding-guo (College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China)

【机构】 北京工业大学环境与能源工程学院环境电化学实验室；

【摘要】 为了提高LiNiO2的电化学性能和热稳定性,采用液相共沉淀法对LiNiO2进行表面包覆改性,合成材料为LiNi0.9Co0.05Mn0.05O2和LiNi0.9Mn0.1O2。LiNiO2的初始比容量为180 mA·h/g,循环18次后,容量保持率为78.33%;LiNi0.9Co0.05Mn0.05O2的初始比容量为188 mA·h/g,循环18次后,其容量保持率为96.71%; LiNi0.9Mn0.1O2的初始比容量为155 mA·h/g,循环18次后,其容量保持率为97.31%。DSC分别表明:LiNi0.9 Co0.05Mn0.05O2和LiNi0.9Mn0.1O2与电解液起始反应温度较LiNiO2有很大程度的提高,并且放热峰面积显著减小,即提高了材料的热稳定性。对LiNi0.9Co0.05Mn0.05O2和LiNi0.9Mn0.1O2进行吸水性测试结果表明,其容量保持率分别为84.2%和87.0%,即其贮存性能较好。因此,表面包覆改性提高了LiNiO2的电化学性能和热稳定性。更多还原

【Abstract】 In order to improve the electrochemical performance and thermal stability of LiNiO2. composites of LiNi0.9Co0.05Mn0.05O2 and LiNi0.9Mn0.1O2 were synthesized with coated precursor. The initial capacity of LiNiO2 is 180 mA · h/g, after 18 cycles, its capacity retention is 78. 33%. The initial capacity of LiNio.9Coo.osMn0.05O2 is 188 mA· h/g, after 18 cycles, its capacity retention is 96. 71%. The initial capacity of LiNi0.9Mn0.1O2 is 155 mA · h/g, after 18 cycles , its capacity retention is 97. 31%. The results of absorbing water test of the modified composite show that their storage is good. Through a series of testing such as DSC, cycle performance, it is found that the surface modification may reduce the undesired reactions and stabilize the composite particles to improve the cycling performance and stability.更多还原