| Mn3O4包覆对LiNi0.5Mn1.5O4正极材料界面电化学性能的提高 |
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| 引用本文： | 邓苗苗,张大伟,邵 宇,贺晓东,Aqsa Yasmin,陈春华.Mn3O4包覆对LiNi0.5Mn1.5O4正极材料界面电化学性能的提高[J].化学物理学报,2020,33(4):485-490. |
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| 作者姓名： | 邓苗苗 张大伟 邵 宇 贺晓东 Aqsa Yasmin 陈春华 |
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| 作者单位： | 合肥工业大学化学与化工学院，合肥 230009；中国科学技术大学化学与材料科学学院, 合肥 230026 |
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| 摘 要： | 本文采用化学湿磨法，首次将金属氧化物Mn3O4包覆于LiNi0.5Mn1.5O4颗粒表面，使得电极材料的电子电导率从1.53×10-7 S/cm 提高到3.15×10-5 S/cm. 电化学测试结果表明Mn3O4包覆大大提高LiNi0.5Mn1.5O4正极材料的倍率性能和高温循环稳定性. 最佳包覆样品为2.6wt% Mn3O4包覆的LiNi0.5Mn1.5O4，在10 C倍率下具有108 mAh/g的高放电容并且在55 °C下100次循环后仍有78%的容量保持率，远大于未包覆样品67%的容量保持率.
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| 关 键 词： | 锂离子电池，正极材料，尖晶石锂镍锰金属氧化物，表面改性 |
| 收稿时间： | 2019/6/12 0:00:00 |
Improving Interfacial Electrochemistry of LiNi0.5Mn1.5O4 Cathode Coated by Mn3O4 |
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| Miao-miao Deng,Da-wei Zhang,Yu Shao,Xiao-dong He,Aqsa Yasmin,Chun-hua Chen.Improving Interfacial Electrochemistry of LiNi0.5Mn1.5O4 Cathode Coated by Mn3O4[J].Chinese Journal of Chemical Physics,2020,33(4):485-490. |
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| Authors: | Miao-miao Deng Da-wei Zhang Yu Shao Xiao-dong He Aqsa Yasmin Chun-hua Chen |
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| Abstract: | In this work the surface of LiNi0.5Mn1.5O4 (LMN) particles is modified by Mn3O4 coating through a simple wet grinding method, the electronic conductivity is significantly improved from 1.53×10-7 S/cm to 3.15×10-5 S/cm after 2.6 wt% Mn3O4 coating. The electrochemical test results indicate that Mn3O4 coating dramatically enhances both rate performance and cycling capability (at 55 °C) of LNM. Among the samples, 2.6 wt% Mn3O4-coated LNM not only exhibits excellent rate capability (a large capacity of 108 mAh/g at 10 C rate) but also shows 78% capacity retention at 55 °C and 1 C rate after 100 cycles. |
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| Keywords: | Lithium-ion batteries Cathode materials Spinel lithium nickel manganese oxide Surface modification Cathode-electrolyte interphase |
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