Electrochemical Device Comprising A Separator Containing Pvdf And A High Viscosity Or High Polarity Electrolytic Composition

Abstract: The present invention relates to an electrochemical device comprising a separator and an electrolytic composition, characterised in that said separator comprises at least one coating comprising a polymer resin comprising vinylidene fluoride monomer units and monomer units of the formula R1R2C=C(R3)C(O)R, wherein the substituents R1, R2 and R3 are independently selected from the group consisting of H and a C1- C5 alkyl; R is selected from the group consisting of –NHC(CH3)2CH2C(O)CH3 or – OR' where R' is selected from the group consisting of H and a C1-C18 alkyl optionally substituted by one or more –OH groups or a five- or six-membered heterocycle comprising at least one nitrogen atom in its cyclic chain, and said electrolytic composition comprises a solvent and a lithium salt; said electrolytic composition having a viscosity greater than 2 cP measured at 20°C and with a shear of 20s-1 or said solvent having a dipole moment greater than 2 Debye at 25°C.

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