化工新型材料

化工新型材料 ›› 2021, Vol. 49 ›› Issue (8) : 153-158. DOI: 10.19817/j.cnki.issn 1006-3536.2021.08.032

科学研究

MgF₂包覆对锂离子电池正极材料LiNi_0.4Co_0.2Mn_0.4O₂的性能影响

张海朗, 吴冯杰, 王小满

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Influence of MgF₂ coating on the performance of LiNi_0.4Co_0.2Mn_0.4O₂ cathode material for Li-ion battery

Zhang Hailang, Wu Fengjie, Wang Xiaoman

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Received		Published
2020-05-04		2021-08-20
Issue Date	Revised Date
2021-09-07	2020-05-04

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摘要

通过流变相法合成LiNi_0.4Co_0.2Mn_0.4O₂材料,用MgF₂包覆对其进行表面修饰改性,来改善高温、高倍率下的循环稳定性。利用X射线衍射仪、扫描电子显微镜和充放电测试技术研究MgF₂包覆对正极材料的晶体结构、微观形貌和电化学性能的影响。电化学性能测试结果表明,当MgF₂的包覆量为1％时,材料的充放电性能和循环性能最好,初始放电比容量为176.2mAh/g;50次循环后,放电比容量仅降到162.9mAh/g,容量保持率最高,为92.4%,表现出良好的电化学稳定性。这些结果表明,通过对LiNi_0.4Co_0.2Mn_0.4O₂表面进行MgF₂包覆处理,可以提高材料的电子导电率,减少电极材料与电解液的副反应。MgF₂包覆改性使三元正极材料的电化学性能有一定程度的提高。

Abstract

LiNi_0.4Co_0.2Mn_0.4O₂ material was synthesized by flow phase method,and the surface modification of LiNi_0.4Co_0.2Mn_0.4O₂ was carried out with MgF₂ coating,so as to improve the cyclic stability at high temperature and high rate.The influence of MgF₂ coating on the crystal structure,microstructure and electrochemical properties of the materials was studied by X-ray diffractometer,scanning electron microscope and charge-discharge test.Electrochemical performance test results shown that:when the MgF₂ coating amount was 1%,the charging and discharging performance and cycling performance were all the best,the initial discharge capacity was 176.2mAh/g.After 50 cycles,the discharge capacity was only reduced to 162.9mAh/g.The capacity retention rate was the highest of 92.4%,showing good electrochemical stability.These results shown that MgF₂ coating on LiNi_0.4Co_0.2Mn_0.4O₂ can improve the electronic conductivity of the material,and reduced the side reaction between the electrode material and the electrolyte.The electrochemical properties of the materials were improved to a certain extent by MgF₂ coating modification.

关键词

锂离子电池 / LiNi_0.4Co_0.2Mn_0.4O₂ / MgF₂ / 包覆 / 循环性能

Key words

Li-ion battery / LiNi_0.4Co_0.2Mn_0.4O₂ / MgF₂ / coating / cycle performance

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MgF₂包覆对锂离子电池正极材料LiNi_0.4Co_0.2Mn_0.4O₂的性能影响[J]. 化工新型材料, 2021, 49(8): 153-158 DOI:10.19817/j.cnki.issn 1006-3536.2021.08.032

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