Abstract: In order to meet the requirement of high power performance of new energy vehicles,5 V cathode material LiNi_0.5Mn_1.5O₄ with spinel structure was prepared by solid state mechanical activation method.The produced sample was analyzed and characterized by XRD,SEM,and electrochemical measurement etc..Results showed that the cathode material had pure spinel crystal structure,the microstructure was octahedron which had a diameter of 10~15 μm,the first discharge capacityat room temperature was about 130 mA•h/g(0.2 C),and the capacity retain ratio was 89% after 50 cycles. 

Key words: power battery, cathode material, spinel