Improving Interfacial Electrochemistry of LiNi_0.5Mn_1.5O₄ Cathode Coated by Mn₃O₄

In this work the surface of LiNi_0.5Mn_1.5O_4 (LMN) particles is modified by Mn_3O_4 coating through a simple wet grinding method, the electronic conductivity is significantly improved from 1.53\times10^-7 S/cm to 3.15\times10^-5 S/cm after 2.6 wt% Mn_3O_4 coating. The electrochemical test results indicate that Mn_3O_4 coating dramatically enhances both rate performance and cycling capability (at 55 ℃) of LNM. Among the samples, 2.6 wt% Mn_3O_4-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 ℃ and 1 C rate after 100 cycles.