Effects of SrO/Li2O/La2O3/Ta2O5/TiO2-coating on electrochemical performance of LiCoO2
来源期刊：Journal of Rare Earths2009年第2期
论文作者：王洪 邓璋琼 陈鸣才
文章页码：234 - 239
摘 要：Commercial cathode material （LiCoO2） was modified by coating with a thin layer of SrO/Li2O/La2O3/Ta2O5/TiO2 for improving its performance in lithium ion battery. The morphology and structure of the modified cathode material were characterized by scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The performance including cycling stability, diffusion coefficient under different voltage, C-rate discharge of the batteries with this modified cathode material was examined. The results showed that the battery with the coated cathode material could discharge at a large current density, and it possessed a stable cycle performance in the range from 3.0 V to 4.2 V. It was explained that the rate of Li ion diffusion increased in the batteries using SrO/Li2O/La2O3/Ta2O5/TiO2-coated LiCoO2 as the cathode and the coated layer could act as a fast ion conductor （Sr0.5La0.05Li0.35 Ti0.5Ta0.5O3） and as a protecting shell to prevent LiCoO2 particles from being attacked by the acidic electrolyte.
王洪1,2，邓璋琼1，陈鸣才2
1. School of Chemistry and Chemical Engineering,Mianyang Normal University,Mianyang 621000,China2. Key Laboratory of Polymer for Electronics,Guangdong Province,Guangzhou Institute of Chemistry,Academia Sinica,Guangzhou 510650,China
摘 要：Commercial cathode material （LiCoO2） was modified by coating with a thin layer of SrO/Li2O/La2O3/Ta2O5/TiO2 for improving its performance in lithium ion battery. The morphology and structure of the modified cathode material were characterized by scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The performance including cycling stability, diffusion coefficient under different voltage, C-rate discharge of the batteries with this modified cathode material was examined. The results showed that the battery with the coated cathode material could discharge at a large current density, and it possessed a stable cycle performance in the range from 3.0 V to 4.2 V. It was explained that the rate of Li ion diffusion increased in the batteries using SrO/Li2O/La2O3/Ta2O5/TiO2-coated LiCoO2 as the cathode and the coated layer could act as a fast ion conductor （Sr0.5La0.05Li0.35 Ti0.5Ta0.5O3） and as a protecting shell to prevent LiCoO2 particles from being attacked by the acidic electrolyte.
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