RECHARGEABLE LITHIUM ION BATTERY WITH IMPROVED LIFE CHARACTERISTICS

摘要

A secondary Li-ion battery comprising a casing comprising as battery parts: a positive electrode comprising a powderous positive electrode active material, a negative electrode, a separator, and an electrolyte, wherein the casing is provided with means for maintaining the exterior form of the casing, and wherein the positive electrode active material has the general formula Li1+a(NixCoyMz)1−aO2, wherein M=M′1−bAb, M′ being either one or both of Al and Mg, and A being a dopant with b≤0.10, and wherein −0.03≤a≤0.03, 0.80≤×≤0.95, 0.05≤y≤0.20, z≤0.10, with x+y+z=1, and wherein the positive electrode active material has a crystallite size ≤43 nm as determined by the Sherrer equation based on the peak of the (104) plane obtained from the X-ray diffraction pattern using a Cu Kα radiation source, and wherein the positive electrode active material further comprises between 0.4 and 0.6 wt % LiOH.