Patent ID: 8685289

Claim:
A pulverulent compound of the formula Li a Ni b M1 c M2 d (O) 2 (SO 4 ) x , in which M1 denotes at least one element selected from the group consisting of Fe, Co, Cr, Mg, Zn, Cu and/or mixtures thereof, M2 denotes at least one element selected from the group consisting of Mn, Al, B, Ca, Sr, Ba, Si and/or mixtures thereof, and 0.95â‰¦aâ‰¦1.1, 0.3â‰¦bâ‰¦0.83, 0.1â‰¦câ‰¦0.5, 0.03â‰¦dâ‰¦0.5 and 0.001â‰¦xâ‰¦0.03, wherein secondary particles composed of a multiplicity of primary particles of the pulverulent compound have a compressive strength of at least 100 MPa and the secondary particles have a normalized width of the particle size distribution, measured according to the Formula (1) D â¢ â¢ 90 - D â¢ â¢ 10 D â¢ â¢ 50 ( 1 ) in which D denotes the diameter of the secondary particles, is not more than 0.89; wherein the pulverulent compound is prepared by thoroughly mixing a co-precipitated nickel-containing precursor with a lithium-containing component to form a homogeneous mixture, and heating the mixture in a plurality of temperature stages.