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Preparation and characterization of electrospun LiFePO4/carbon complex improving rate performance at high C-rate
2019/11/27 21:32:16 admin
LiFePO4/carbon complexes were prepared by electrospinning to improve rate performance at high C-rate and their electrochemical properties were investigated to be used as a cathode active material for lithium ion battery. The LiFePO4/carbon complexes were prepared by the electrospinning method. The prepared samples were characterized by SEM, EDS, XRD, TGA, electrometer, and electrochemical analysis. The LiFePO4/carbon complexes prepared have a continuous structure with carbon-coated LiFePO4 and the LiFePO4 in LiFePO4/carbon complex has improved thermal stability from carbon coating. The conductivity of LiFePO4/carbon complex heat-treated at 800 A degrees C is measured as 2.23 x 10(-2) S cm(-1), which is about 10(6)-10(7) times more than that of raw LiFePO4. The capacity ratio of coin cell manufactured from raw LiFePO4 is 40%, whereas the capacity ratio of coin cell manufactured from LiFePO4/carbon complex heat-treated at 800 A degrees C is 61% (10 C/0.1 C). The improved rate performance of LiFePO4/carbon complex heat-treated at 800 A degrees C is due to the carbon coating and good electrical connection.
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