期刊
JOURNAL OF RARE EARTHS
卷 27, 期 2, 页码 234-239出版社
ELSEVIER
DOI: 10.1016/S1002-0721(08)60226-4
关键词
SrO/Li2O/La2O3/Ta2O5/TiO2-coated LiCoO2; lithium-ion batteries; diffusion coefficient; fast ion conductor; rare earths
资金
- Natural Science Foundation of Guangdong Province, China [06105562]
- Foundation of Manyang Bureau of Science and Technology, China [07Y003-1]
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, Grate 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 (Sr0.5La0.05Li0.35Ti0.5Ta0.5O3) and as a protecting shell to prevent LiCoO2 particles from being attacked by the acidic electrolyte.
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