In order to obtain the LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2 product with high specific discharge capacity,long cycling life and good rate performance,the related preparation methods(sol-gel and Pechini methods)and the modified ways(Zr~(4+) doping,LBO coating and the synthesis of one dimension hierarchy structure)are under research creatively in this paper.The properties of the material samples or the simulated coin cells are investigated by XRD,SEM(TEM),charge-discharge cycling,CV,EIS and other measurement/charact...