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Synthesis of in situ network-like vapor-grown carbon fiber improved LiFePO4 cathode materials by microwave pyrolysis chemical vapor deposition |
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| Authors: | F. DengX.R. Zeng J.Z. Zou J.F. HuangX.B. Xiong X.H. Li |
| Affiliation: | a School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’ an 710072, China b College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China c Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 518060, China |
| Abstract: | The low electronic conductivity of LiFePO4 currently limits its use in lithium ion batteries. In order to solve the problem, in situ network-like vapor-grown carbon fiber (VGCF) improved LiFePO4 cathode materials have been prepared in one step by microwave pyrolysis chemical vapor deposition. The phase, microstructure and electrochemical performances of the composites were investigated. Compared with the cathodes without in situ VGCF, the initial discharge capacity of the composite electrode increases from 84 mAh g−1 to 123 mAh g−1 at 3.0 C rate, and the charge transfer resistance varies from 420 Ω to 75 Ω. The possible reasons of those are proposed. |
| Keywords: | Electrode materials Gas-solid reactions Vapor deposition Microstructure Scanning electron microscopy |
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