Improving the interfacial electrochemistry of LiNi0.5Mn1.5O4 cathode by Mn3O4 coating

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.