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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 ℃) of LNM.Among the samples,2.6 wt％ MnaO4-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.