Fe掺杂对LiNi0.5Mn1.5O4正极材料的改进

曾存勇, 张海朗

化工新型材料 ›› 2019, Vol. 47 ›› Issue (10) : 153 -156.

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化工新型材料 ›› 2019, Vol. 47 ›› Issue (10) : 153-156.
科学研究

Fe掺杂对LiNi0.5Mn1.5O4正极材料的改进

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Influence of Fe doping on improving property of LiNi0.5Mn1.5O4 anode material

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摘要

通过溶胶-凝胶法合成了高电压LiNi0.5-xMn1.5FexO4(0≤x≤0.2)尖晶石锂离子电池正极材料。采用X射线衍射仪(XRD)和恒电流充放电测试来研究样品的结构和电化学性质。结果表明,在LiNi0.5Mn1.5O4样品中掺Fe可以提高样品的结构稳定性,从而改善其循环性能。电化学测试结果表明,LiNi0.35Mn1.5Fe0.15O4具有最佳循环稳定性,并且在0.2C倍率下,初始放电比容量达136.8mAh/g,循环50次后容量保持率为98.7%。

Abstract

LiNi0.5-xMn1.5FexO4(0≤x≤0.2) spinels anode materials for Li-ion battery were synthesized by a sol-gel method.Their structures and electrochemical properties were studied by X-ray powder diffraction(XRD) and galvanostatic charge-discharge testing.The results shown that the introduction of Fe in the LiNi0.5Mn1.5O4 samples can improve the structural stability,thereby improving their cycling performance.The electrochemical testing results demonstrated that LiNi0.35Mn1.5Fe0.15O4 material had the best cycling stability and its initial discharge capacity was 136.8mAh/g at 0.2C rate with a capacity retention of 98.7% after 50 cycles.

关键词

锂离子电池 / 溶胶-凝胶法 / 正极材料 / LiNi0.5Mn1.5O4 / Fe掺杂

Key words

Li-ion battery / sol-gel method / anode material / LiNi0.5Mn1.5Fe0.15O4 / Fe doping

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曾存勇, 张海朗. Fe掺杂对LiNi0.5Mn1.5O4正极材料的改进[J]. 化工新型材料, 2019, 47(10): 153-156 DOI:

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