NON-HOMOGENEOUS POSITIVE ELECTRODE MATERIALS COMBINING HIGH SAFETY AND HIGH POWER IN A LI RECHARGEABLE BATTERY

摘要

The invention relates to a LiaNixCoyMzO2±eAf composite oxide for use as a cathode material in a rechargeable battery, with a non-homogenous Ni/Al ratio in the particles, allowing excellent power and safety properties when used as positive electrode material in Li battery. More particularly, in the formula 0.9a1.1, 0.3@x@0.9, 0@y@0.4, 0z@0.35, e=0, 0@f@0.05 and 0.9(x+y+z+f)1.1; M consists of either one or more elements from the group Al, Mg and Ti; A consists of either one or more elements from the group S and C. The powder has a particle size distribution defining a D10, D50 and D90; and said x and z parameters varying with the particles size of said powder, and is characterized in that either one or both of: x1-x2=0.010 and z2-z1=0.010; x1 and z1 being the parameters corresponding to particles having a particle size D90; and x2 and z2 being the parameters corresponding to particles having a particle size D10.