Synthesis and Electrochemical Properties of LiFeP0.95B0.05O4-δ/C Cathode Materials

doi:10.3724/SP.J.1077.2010.00230

Abstract

Abstract: B-doped LiFePO₄ in P-site, LiFeP_0.95B_0.05O_4-δ/C composite materials were synthesized in flowing Ar atmosphere by solgel method, using citric acid as chelating agent and carbon source. Samples were characterized by X-ray diffraction and cyclic voltammetry, and their electrochemical performances were investigated by galvanostatic charge/discharge tests in terms of cycling performance and rate capability．The results show that the samples have wellregulated olivinetype structures without any impurity peaks while B-doping improves the conductivity of composite materials and decreases the polarization of electrode, and enhances the cycling performance and rate capability effectively. The discharge capacities of LiFeP_0.95B_0.05O_4-δ/C synthesized at 650℃ are 149.3, 123.4 and 112.1 mAh/g at the rates of 0.2C, 5C and 10C, with retention ratio of 99.3% after 20 cycles at the rate of 0.2C, 91.65% after 150 cycles at the rate of 5C and 92.9% after 150 cycles at the rate of 10C, respectively. After continuous 30 cycles at different rates of 0.2, 1, 3, 5 and 10C, the discharge capacity of 0.2C can reconvert to the previous value.

Key words: lithium-ion battery, cathode material, lithium iron phosphate, B-doping

CLC Number:

TM921

REN Zhao-Gang,QU Mei-Zhen,YU Zu-Long. Synthesis and Electrochemical Properties of LiFeP_0.95B_0.05O_4-δ/C Cathode Materials[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2010.00230.

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Synthesis and Electrochemical Properties of LiFeP_0.95B_0.05O_4-δ/C Cathode Materials

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