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低共熔混合锂盐合成LiNi_0.8Co_0.2O₂的研究

Preparation of LiNi_0.8Co_0.2O₂using eutectic mixed lithium salt

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【Author】 CHANG Zhao-rong~(1,2),QI Xia~(2),WU Feng~(1),TANG Hongwei~(2),SUN Dong~(2)(1.College of Chemical Engineering and Environmental,Beijing Institute of Technology,Beijing 100080,China;2.College of Chemistry and Environmental Science,Henan Normal University,Xinxiang 453007,China)

【机构】北京理工大学化工与环境学院；河南师范大学化学与环境科学学院；河南师范大学化学与环境科学学院北京100080；河南新乡453007；北京100080；河南新乡453007；

【摘要】在空气气氛中,采用低共熔混合物L iNO3-L iOH为锂盐,制备出了锂离子电池正极材料L iN i0.8Co0.2O2。XRD分析表明:此工艺制得的正极材料具有完整的层状结构。电性能测试表明:在0.5 mA/cm2的充放电电流密度和2.7~4.2 V的电压范围内,L iN i0.8Co0.2O2首次放电比容量为145.2 mA.h/g,充放电库仑效率为83.8%;循环20次后,放电比容量为124.8 mA.h/g。该方法能制备出电化学性能良好的L iN i0.8Co0.2O2正极材料。更多还原

【Abstract】 In air atmosphere,using eutectic mixture of LiNO₃-LiOH as lithium salt to prepare cathode materials LiNi_0.8Co_0.2O₂ for lithium ion battery.XRD results showed the prepared cathode materials had perfect layer structure.Electrochemical property tests testified that for charge-discharge current density of（0.5）mA/cm² and voltage of 2.7 V and 4.2 V,the initial discharge specific capacity of prepared LiNi_0.8-Co_0.2O₂ was 145.2 mA·h/g and the coulomb efficiency was 83.8%.The discharge specific capacity remains 124.8 mA·h/g after the 20th cycles,indicating cathode material LiNi_0.8Co_0.2O₂ with good electrochemical property can be prepared by this technology.更多还原