Binder For Electrode Comprising Poly(vinylidene Fluoride) And A Hydrophilic Polymer

Abstract: The present invention relates to a binder composition for positive electrodes comprising a polymer P1 comprising recurring units derived from vinylidene fluoride and a hydrophilic polymer P2 comprising recurring units derived from at least one monomer of formula R1R2C=C(R3)C(O)R (I) wherein R1 R2 and R3 are independently selected from the group consisting of H and C1 C5 alkyl; R is selected from the group consisting of ???NHC(CH3)2CH2C(O)CH3 NRRor OR wherein R and R are independently selected from the group consisting of H and C1 C18 alkyl groups optionally substituted by one or more hydroxyl thiol or amino functional group(s) or a five to six membered heterocycle comprising at least one nitrogen atom in the ring; characterized in that the weight average molecular weight of said hydrophilic polymer P2 is greater than 30000 g/mol advantageously greater than 50000 g/mol preferably greater than 65000 g/mol more preferably greater than 80000 g/mol.

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