Patent ID: 8679686

Claim:
A positive electrode/electrolyte pair for a lithium battery, characterized in that: the positive electrode is made of a material with a spinel structure of the following formula (I) and has a lattice parameter of between 8.167 and 8.190 Å: Li y Ni 0.5−x Mn 1.5+x O 4−δ Formula (I) in which: 0.9<y≦1.1; 0≦x≦0.1; and δ≧0, and in that: the electrolyte is a solution of a lithium salt containing at least one first additive chosen from butane-1,4-dicarboxylic anhydride and 2-methylene butane1,4dicarboxylic anhydride, and mixtures thereof, and optionally a second additive that is a lithium salt.