Cathode composition for lithium-ion battery

A cathode composition for a lithium-ion battery, the cathode composition comprising an active material which comprises an alloy of lithium nickel cobalt aluminum oxides, an electrically conductive filler and a polymeric binder,

• wherein said polymeric binder comprises at least one modified polymer which is a product of a thermal oxidation reaction of a starting polymer and which incorporates oxygenated groups comprising CO groups and OH groups, in which the starting polymer
• (i) comprises a nonhydrogenated acrylonitrile/butadiene copolymer (NBR) and/or a hydrogenated acrylonitrile/butadiene copolymer (HNBR) which each exhibit(s) a content by weight of units resulting from acrylonitrile equal to or greater than 40%, the at least one modified polymer being crosslinked by the thermal oxidation reaction, or
• (ii) is a nonpolar aliphatic hydrocarbon polyolefin, the at least one modified polymer not being crosslinked and having a content by weight of oxygen atoms of between 2% and 10% inclusive,
• the cathode composition being obtained by a molten route and without evaporation of solvent, the cathode composition being a product of said thermal oxidation reaction applied to a solvent-free precursor mixture comprising said active material, said electrically conductive filler, said starting polymer and a sacrificial polymer phase, said sacrificial polymer phase comprising at least one poly(alkene carbonate) polyol comprising end groups, more than 50 mol % of which comprise hydroxyl functional groups.