Solid State Reaction Preparation of LiFePO4/（C+Cu） Cathode Material and Its Electrochemical Performance
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2013年第10期
论文作者：Yanhong Yin Xiangnan Li Xinxin Mao Xianliang Ding Shuting Yang
文章页码：937 - 942
摘 要：CueC co-coated LiFePO4（LiFePO4/（C+Cu）） cathode material was successfully prepared through solid state reduction reaction.The optimized additive amount of℃uO was determined by electrochemical test of series content-dependent samples.Electrochemical performances of LiFePO4/（C+Cu） cathode material were investigated.℃rystalline structure,morphology and electrochemical performance of the samples were characterized by X-ray diffraction,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,energy dispersive spectroscopy（EDS）,chargeedischarge tests and AC impedance techniques.Results showed that crystal structure of the bulk material was not destroyed after℃u particles distributed on the surface of LiFePO4/C.With 5 wt%℃uO additive,the LiFePO4/（C+Cu） cathode material showed improved electrochemical performance especially at high rates and low temperature.At 25℃ and 0.1℃ current rate,specific capacity of the℃u-coated sample reaches 161.3 mA h/g.The result was 47 mA h/g higher than that of the un-coated one.At 20℃,the discharge capacity of℃u-coated materials was 113.4 mA h/g at 0.1℃ rate and 83.8 mA h/g at 5℃ rate,which reached about 70% of that at room temperature,respectively.
Yanhong Yin1,2，Xiangnan Li1,2，Xinxin Mao1,2，Xianliang Ding1,2，Shuting Yang1,2
1. School of Chemistry and Chemical Engineering,Henan Normal University2. Engineering Technology Research Center of Motive Power and Key Materials of Henan Province
摘 要：CueC co-coated LiFePO4（LiFePO4/（C+Cu）） cathode material was successfully prepared through solid state reduction reaction.The optimized additive amount of℃uO was determined by electrochemical test of series content-dependent samples.Electrochemical performances of LiFePO4/（C+Cu） cathode material were investigated.℃rystalline structure,morphology and electrochemical performance of the samples were characterized by X-ray diffraction,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,energy dispersive spectroscopy（EDS）,chargeedischarge tests and AC impedance techniques.Results showed that crystal structure of the bulk material was not destroyed after℃u particles distributed on the surface of LiFePO4/C.With 5 wt%℃uO additive,the LiFePO4/（C+Cu） cathode material showed improved electrochemical performance especially at high rates and low temperature.At 25℃ and 0.1℃ current rate,specific capacity of the℃u-coated sample reaches 161.3 mA h/g.The result was 47 mA h/g higher than that of the un-coated one.At 20℃,the discharge capacity of℃u-coated materials was 113.4 mA h/g at 0.1℃ rate and 83.8 mA h/g at 5℃ rate,which reached about 70% of that at room temperature,respectively.
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