Synthesis and Characterization of LiFePO4/Al/C Composite Cathode Material

doi:10.3724/SP.J.1077.2012.11719

Abstract

Abstract: LiFePO4/Al/C composite cathode materials were synthesized by two-step solid-state method. The crystalline structure, morphology, the particle size and the coated state of the samples were characterized by XRD, SEM and TEM. The effect of the amounts of Al powder on the electrochemical properties of the composite was investigated. The results show that the interface reaction occurs between metal Al and LiFePO₄, resulting in the formation of several by-products and the passive film on the surface of LiFePO₄. The surface of LiFePO₄ particles are coated by the irregularly shaped metal Al and a thin carbon layer of 1-2 nm. The LiFePO₄/Al/C containing 3wt% Al shows the best electrochemical performances, with discharge specific capacity of 117.8 mAh/g at 25℃ and 10C rate, and discharge specific capacity of 105.6 mAh/g at -20℃ and 0.1C rate, and discharge capacity of samples at -20℃ is 73.8% of that of samples at 25℃.

Key words: lithium iron phosphate, composite cathode material, aluminium, carbon coating

CLC Number:

TM912

CHEN Wei, PENG Wen-Jie, WANG Zhi-Xing. Synthesis and Characterization of LiFePO₄/Al/C Composite Cathode Material[J]. Journal of Inorganic Materials, 2012, 27(10): 1030-1034.

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Synthesis and Characterization of LiFePO₄/Al/C Composite Cathode Material

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