Abstract: A liquid electrolyte lithium secondary battery cell comprising: - a positive electrode material comprising a lithium transition metal-based oxide powder having a general formula Li1+a ((Niz (Ni0.5Mn0.5)y Cox)1-k Ak)1-a O2, wherein A is a dopant, -0.025=a=0.025, 0.18=x=0.22, 0.42=z=0.52, 1.075