6. A lithium metal oxide powder for use in a positive electrode material in a rechargeable battery having the general formula Li1+aM1-aO2Wherein M is NixMnyCozAvA is a dopant, where-0.05. ltoreq. a.ltoreq.0.25, 0.20. ltoreq. x.ltoreq.0.90, 0.10. ltoreq. y.ltoreq.0.67, and 0.10. ltoreq. z.ltoreq.0.40, v.ltoreq.0.05, and x + y + z + v.ltoreq.1, the powder having a particle size distribution of 10 μm. ltoreq.D 50. ltoreq.20 μm, a specific surface area of 0.9. ltoreq.
BET 5 in m<Sup>2</Sup>Expressed in terms of/g, said powder further comprising sodium and sulphur impurities, wherein said sodium (Na) is expressed in weight%<Sub>Weight (D)</Sub>) And sulfur (S)<Sub>Weight (D)</Sub>) ComprisesSum of the amounts (2 Na)<Sub>Weight (D)</Sub>)+S<Sub>Weight (D)</Sub>More than 0.4 wt% and less than 1.6 wt%, and wherein the molar ratio of sodium to sulfur (Na/S) is 0.4<Na/S<2。
powder
particle size distribution
10 μm. ltoreq.D 50. ltoreq.20 μm
μm
powder
specific surface area
0.9.