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Improving the interfacial electrochemistry of LiNi0.5Mn1.5O4 cathode by Mn3O4 coating
陈春华
作者单位E-mail
陈春华 中国科技大学材料系 cchchen@ustc.edu.cn 
摘要:
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-1提高到3.15?10-5 S cm-1。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2.6 wt.% Mn3O4包覆的LiNi0.5Mn1.5O4,在10 C倍率下具有108 mA h g-1的高放电容并且在55℃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。
关键词:  Lithium-ion batteries, cathode materials, spinel lithium nickel manganese oxide, surface modification, cathode-electrolyte interphase
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Improving the interfacial electrochemistry of LiNi0.5Mn1.5O4 cathode by Mn3O4 coating
Chun-Hua Chen
Abstract:
A Mn3O4 coating is approved to modify the surface of LiNi0.5Mn1.5O4 particles by a simple wet grinding method for the first time, which realize an great improvement in electronic conductivity from 1.53?10-7 S cm-1 to 3.15?10-5 S cm-1 after 2.6% Mn3O4 coating. The electrochemical test resualts demonstrate that the Mn3O4 coating dramatically enhances both the rate performance and cycling capability (at 55 °C) of LiNi0.5Mn1.5O4. Among the samples, 2.6% Mn3O4-coated LiNi0.5Mn1.5O4 not only exhibits excellent rate capability (a large capacity of 108 mAh g-1 at 10 C rate) but also keep 78% capacity retention at 55 °C and 1 C rate after 100 cycles.
Key words:  Lithium-ion batteries, cathode materials, spinel lithium nickel manganese oxide, surface modification, cathode-electrolyte interphase