| 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<z/y<1.625, x+y+z=1 and k≤0.01; and - an electrolyte composition comprising: a) at least one cyclic carbonate, b) at least one fluorinated acyclic carboxylic acid ester, c) at least one electrolyte salt, d) at least one lithium compound selected from lithium phosphate compounds, lithium boron compounds, lithium sulfonate compounds and mixtures thereof, e) at least one cyclic sulfur compound, and f) optionally at least one cyclic carboxylic acid anhydride. |