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Study on the Improving Performance of LiFePO4 by Doping Mg and Mn

Author: QiuSuFen
Tutor: YangShaoBin
School: Liaoning Technical University
Course: Materials Science
Keywords: Lithium-ion battery LiFePO4 ion doping Mg2+ Mn2+
CLC: TM912
Type: Master's thesis
Year: 2009
Downloads: 65
Quote: 0
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Abstract


Because of its high theoretical capacity (170mAh/g),and feasible voltage (about 3.5V, vs. Li+/Li), good stability both at room temperature and high temperature, and being environmental benign and inexpensive, LiFePO4 is very hopeful material as positive electrode materials for the future lithium-ion batteries material. However, it has a extremely low electronic conductivity and slow Li+ ion diffusion, and it has the poor terms of rate discharge. These drawbacks limit its large-scale application of power battery. So from LiFePO4 emergence, the hotspot of LiFePO4 is straight improving the electrical conductivity.The effects of technical conditions (Li/Fe ratio; sintering temperature; sintering time) on were investigated. On this basis, doping Mg2+、Mn2+ metal ions improves electrochemical performance of LiFePO4. Charge-discharge test and XRD diffraction analysis were applied to test its performance. The results showed that : The electrochemical performance of LiFePO4 sample which prepared at 700℃for 10h and Li/Fe(1:1). The initial discharge specific capacity is 117.39 mAh/g.LiFePO4 is doped by Mg2+、Mn2+( each half of the 4%,6%,8%)on the location of Li or Fe or Li/Fe. The results showed that:LiFePO4 samples which doped Mg2+and Mn2+ are simple pure olive-type phase and its electrochemical performance have significant improvement. The initial discharge specific capacity of LiFe0.92Mg0.04Mn0.04PO4 sample is 153.31 mAh/g and is better than the other samples.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
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