CPC H01M 4/525 (2013.01) [H01M 4/0466 (2013.01); H01M 4/1399 (2013.01); H01M 4/622 (2013.01); H01M 4/625 (2013.01); H01M 4/661 (2013.01); H01M 10/0525 (2013.01); H01M 10/0569 (2013.01); H01M 2004/021 (2013.01)] | 18 Claims |
1. 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.
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