BINDER SOLUTION FOR A SECONDARY BATTERY

The present invention relates to a binder solution for a secondary battery, comprising at least one non-aqueous solvent and at least one fluoropolymer comprising recurring units derived from a) vinylidene difluorides and b) at least one fluorinated olefin monomer containing at least one -SO2X functional group, X being selected from X' and OM, X' being selected from the consisting of F, Cl, Br, and I; and M being selected from the group consisting of H, an alkaline metal and NH4, wherein b) the fluorinated olefin monomer is present in an amount from 0.1 to 10.0 mol%, the mol% being relative to the total moles of recurring units; to a solid composite electrolyte comprising at least one fluoropolymer according to the present invention and at least one sulfide-based solid ionic conducting inorganic particle; to a slurry for manufacturing a solid composite electrolyte comprising a binder solution according to the present invention and at least one sulfide-based solid ionic conducting inorganic particle, optionally further comprising at least one electroactive material and/or at least one conductive agent; and to an electrode comprising at least one fluoropolymer according to the present invention and at least one electroactive material, optionally further comprising at least one conductive agent and/or at least one sulfide-based solid ionic conducting inorganic particle. The present invention also relates to a secondary battery comprising a positive electrode, a negative electrode, and a membrane that is positioned between the positive electrode and the negative electrode, wherein at least one of the positive electrode, the negative electrode and the membrane comprises at least one fluoropolymer according to the present invention, optionally further comprising at least one sulfide-based solid ionic conducting inorganic particle, at least one electroactive material and/or at least one conductive agent. La présente invention concerne une solution de liant pour une batterie secondaire, comprenant au moins un solvant non aqueux et au moins un fluoropolymère comprenant des motifs récurrents dérivés a) de difluorures de vinylidène et b) d'au moins un monomère oléfinique fluoré contenant au moins un groupe fonctionnel -SO2X, X étant choisi parmi X' et OM, X' étant choisi dans le groupe consistant en F, Cl, Br et I ; et M étant choisi dans le groupe consistant en H, un métal alcalin et NH4, b) le monomère oléfinique fluoré étant présent en une quantité de 0,1 à 10,0 %