Ni based cathode material for rechargeable lithium-ion batteries

摘要

The invention provides a positive electrode material for lithium ion batteries, comprising a lithium transition metal-based oxide powder having a general formula Li_1+a ((Ni_z(Ni_0.5Mn_0.5)_y Co_x)_1−kA_k)_1−aO₂, wherein A is a dopant, with −0.025≤a≤0.025, 0.15≤x≤0.22, 0.42≤z≤0.52, 1.075z/y1.300, x+y+z=1 and k≤0.01. Different embodiments provide the following features:the lithium transition metal-based oxide powder has a carbon content ≤1000 ppm or even ≤400 ppm;the lithium transition metal-based oxide powder has a sulfur content between 0.05 and 1.0 wt %;a dopant A is Zr, and the powder further comprises up to 1 wt % of a coating comprising a boron compound and WO₃.