6. A lithium metal oxide powder for a positive electrode material in a rechargeable battery, having the general formula Li<sub>1+a</sub>M<sub>1-a</sub>O<sub>2</sub> where M= Ni<sub>x</sub>Mn<sub>y</sub>Co<sub>z</sub>A<sub>v</sub>, A being a dopant, wherein -0.05≤a≤0.25, 0.20≤x≤0.90, 0.10≤y≤0.67, and 0.10≤z≤0.40, v≤0.05, and x+y+z+v=1, the powder having a particle size distribution with 10µm≤D50≤20µm), a specific surface area with 0.9≤BET≤5, the BET being expressed in m<sup>2</sup>/g, the powder further comprising a sodium and sulfur impurity, wherein the sum (2* Na<sub>wt</sub>)+ S<sub>wt</sub> of the sodium (Na<sub>wt</sub>) and sulfur (S<sub>wt</sub>) content expressed in wt% is more than 0.4 wt% and less than 1.6 wt%, and wherein the sodium to sulfur molar ratio (Na/S) is 0.4<Na/S<2.
lithium metal oxide powder
particle size distribution
10µm≤D50≤20µm
µm
lithium metal oxide powder
specific surface area
0.9≤BET≤5, the BET being expressed in m<sup>2</sup>/g
m<sup>2</sup>/g
lithium metal oxide powder
sodium (Na<sub>wt</sub>) and sulfur (S<sub>wt</sub>) content
is more than 0.4 wt% and less than 1.6 wt%
wt%