Ni—Mn composite oxalate powder, lithium transition metal composite oxide powder and lithium ion secondary battery

摘要

A Ni—Mn composite oxalate powder is provided. The Ni—Mn composite oxalate powder includes a plurality of biwedge octahedron particles represented by the general formula: Ni_qMn_xCo_yM_zC₂O₄.nH₂O, wherein q+x+y+z=1, 0q, x1, 0≦y1, 0≦z0.15, 0≦n≦5, and M is at least one of Mg, Sr, Ba, Cd, Zn, Al, Ga, B, Zr, Ti, Ca, Ce, Y, Nb, Cr, Fe and V. The above powder may be further calcined with a lithium salt to form a lithium transition metal oxide powder for use as a positive electrode material in lithium ion-batteries.