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AssigneeHutchinson
InventorsPhilippe SONNTAG, Julie COURTAT, Marc ZIMMERMANN, Ksenia ASTAFYEVA, Bruno Dufour, David AYME-PERROT
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Polymer composition for an electrode, method, and a lithium-ion battery including same are provided. This composition includes an active material having a graphite usable in the anode, an electrically conductive filler and a cross-linked elastomer binder that includes a hydrogenated acrylonitrile butadiene copolymer (HNBR). The binder includes a non-hydrogenated acrylonitrile butadiene copolymer (NBR) and/or an HNBR with an acrylonitrile content that is at least 40% by weight and cross-linked by thermal oxidation. This method includes: a) mixing the active material, the binder in a non-cross-linked state and the electrically conductive filler, to obtain a precursor mixture of the composition, b) depositing the mixture on a metal current collector so that the mixture forms a non-cross-linked film, then c) thermal oxidation of the non-cross-linked film under an atmosphere containing oxygen at a temperature of between 200 and 300° C., to obtain the electrode in which the binder is cross-linked.
A polymeric composition for an electrode that is capable of forming a lithium-ion battery anode, the composition comprising an active material which comprises a graphite that is capable of performing reversible insertion/deinsertion of lithium at said anode, an electrically conductive filler and a crosslinked elastomeric binder which comprises at least one hydrogenated acrylonitrile-butadiene copolymer (HNBR), characterized in that said crosslinked binder comprises at least one non-hydrogenated acrylonitrile-butadiene copolymer (NBR) and/or at least one said hydrogenated acrylonitrile-butadiene copolymer (HNBR) which each have a mass content of acrylonitrile-based units of greater than or equal to 40% and which is (are) crosslinked via thermal oxidation.
Dependencies are inferred from the claim text.