Synthesis and Performances of LiMnyFe1-yPO4 as Cathode Materials for Lithium-ion Batteries

doi:10.3724/SP.J.1077.2006.00591

Abstract

Abstract: The LiMn_yFe_1-yPO₄(0.1≤ y≤1) cathode materials for lithium-ion batteries were synthesized by solid-state reaction combined with high-rate ball milling. The crystalline structure, morphology of particles, and electrochemical performance of the sample were investigated by X-ray diffraction, scanning electron microscope, charge-discharge test and cyclic voltammetry. The results show that all LiMn_yFe_1-yPO₄samples are simple pure olive-type phase with small particles, and uniformly distribution of gain sizes. At low rate of 0.1C, the first specific discharge capacity of LiMn_0.1Fe_0.9PO₄ is the highest with 145mAh/g and LiMn0.6Fe0.4PO4 shows the highest energy density of 568Wh/kg. The rate capabilities of the samples are strongly influenced by y value of LiMn_yFe_1-yPO₄. LiMn_0.1Fe_0.9PO₄shows the best rate capabilities with discharge capacity of 130mAh/g at 0.5C rate and 109mAh/g at 1.5C rate.

Key words: lithium-ion batteries, lithium iron/manganese phosphate, cyclic voltammetry, rate capability

CLC Number:

TM912

XIE Hui,ZHOU Zhen-Tao. Synthesis and Performances of LiMn_yFe_1-yPO₄ as Cathode Materials for Lithium-ion Batteries[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2006.00591.

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Synthesis and Performances of LiMn_yFe_1-yPO₄ as Cathode Materials for Lithium-ion Batteries

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