Modification of polyacrylic acid carbonate precursor by self-template graft copolymerization of maleic anhydride and acrylic acid. The structure was stable and dense in the form of intersection network. LiNi0.5Mn1.5O4 cathode material for 5V lithium ion battery was prepared by high temperature sintering. XRD, SEM, galvanostatic charge discharge and electrochemical cyclic voltammetry show that the material has micro-nanostructure, regular crystal shape and uniform particle size. The working platform was 4.7 V, The first discharge capacity was 132 mAh/g at 0.5 C rate. The capacity retention rate of 50 cycles was 93%. The electrochemical performance is excellent.