Effects of Preparation Temperature on Pyrolytic Carbon Coated LiFePO4/Vapor-grown Carbon Fiber (PCLFP/VGCF) Composite Cathode Material

doi:10.3724/SP.J.1077.2011.01141

Abstract

Abstract: Pyrolytic carbon coated LiFePO4/vapor-grown carbon fiber (PCLFP/VGCF) composite cathode materials were prepared by microwave chemical vapor deposition (MCVD) process. Effects of preparation temperature on microstructures and electrochemical properties of the composites were investigated. The results show that with preparation temperature increasing from 500℃ to 600℃, the discharge capacities of the composite electrodes are improved because of the gradual formation of conductive network of VGCF. However, it decreases when the preparation temperature is up to 700℃, which may be attributed to the exaggerated grain growth of LiFePO₄ and the reduction of VGCF network. In addition, the composite cathode materials prepared at 600℃ show better electrochemical properties, with the discharge capacity as high as 163, 159, 153 and 143mAh/g at rate of 0.2C, 0.5C, 1C, 3C, respectively (25℃).

Key words: lithium iron phosphate, pyrolytic carbon, vapor-grown carbon fiber, microwave chemical vapor deposition, lithium ion batteries

CLC Number:

TM912

DENG Fei, ZENG Xie-Rong, ZOU Ji-Zhao, LI Xiao-Hua. Effects of Preparation Temperature on Pyrolytic Carbon Coated LiFePO₄/Vapor-grown Carbon Fiber (PCLFP/VGCF) Composite Cathode Material[J]. Journal of Inorganic Materials, 2011, 26(11): 1141-1146.

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Effects of Preparation Temperature on Pyrolytic Carbon Coated LiFePO₄/Vapor-grown Carbon Fiber (PCLFP/VGCF) Composite Cathode Material

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