Structure and Electrochemical Performance of LiFePO4/C Cathode Materials Coated with Nano Al2O3 for Lithium-ion Battery

doi:10.3724/SP.J.1077.2013.13136

Abstract

Abstract: The structure and electrochemical performance of Al₂O₃-coated LiFePO4 cathode materials were investigated. A nano Al₂O₃ coating on the surface of commercial LiFePO₄/C particles (Aleees Inc.) was prepared by using the Sol-Gel method. The effect of the amount of Al₂O₃ coating on the electrochemical performance and structural stability of LiFePO₄ electrodes at room temperature (25℃) and elevated temperatures (55℃) was studied. The results show that 2wt% Al₂O₃ coating can effectively enhance the cycling capacity, alleviate capacity fading at high temperature and reduce cell impedance. It is largely attributed to Al₂O₃ coating, which plays a regulatory role of lithium-ion inserting the lattice and preventing direct contact between the cathode material and the electrolyte, and improves the structural stability of LiFePO₄during cycles.

Key words: lithium-ion battery, cathode materials, LiFePO₄, nano Al₂O₃ coating

CLC Number:

TQ174

ZHAO Shi-Xi, LI Ying-Da, DING Hao, LI Bao-Hua, NAN Ce-Wen. Structure and Electrochemical Performance of LiFePO₄/C Cathode Materials Coated with Nano Al₂O₃ for Lithium-ion Battery[J]. Journal of Inorganic Materials, 2013, 28(11): 1265-1269.

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Structure and Electrochemical Performance of LiFePO₄/C Cathode Materials Coated with Nano Al₂O₃ for Lithium-ion Battery

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