OXIDE CATHODE MATERIAL FOR LITHIUM ION BATTERY HAVING HIGH ENERGY DENSITY AND PREPARATION PROCESS THEREOF

摘要

Provided are a high energy density oxide anode material for lithium ion battery, preparation process and use thereof. Said anode material includes a main part of the anode material and a covering layer. Said main part includes a shell and a core inside the shell. The material of said core is Li_1+x[Ni_1−y−zCo_yMn_z]O₂ wherein −0.1≦x≦0.2, 0≦y≦0.5, 0≦z≦0.5 and 0≦y+z≦0.7. The material of said shell is Li_1+a[Co_1−bX_b]O₂, wherein −0.1≦a≦0.2, 0≦b≦0.5, and X is selected from Al, Mg, Cu, Zr, Ti, Cr, V, Fe, Mn, Ni, or combination thereof. Otherwise, The material of said main part is a mixture of Li_1+x[Ni_1−y−zCo_yMn_z]O₂ and LiCoO₂, wherein −0.1≦x≦0.2, 0≦y≦0.5, 0z≦0.5 and 0≦y+z≦0.7. The material of said covering layer is selected from Al₂O₃, ZrO₂, MgO, SiO₂, ZnO₂, TiO₂, Y₂O₃, LiAlO₂, or combination thereof. Said anode material has the advantages of high capacity, good cycle performance, low surface activity, high voltage resistance and fine safety. The preparation process is simple, and is suitable for large-scale production.