Electrode-forming composition

An electrochemical device being a secondary battery comprising:

• a positive electrode,
• a negative electrode, and
• between said positive electrode and said negative electrode, a membrane, wherein:
• A) at least one of said positive electrode and said negative electrode is an electrode obtainable by a process, said process comprising:
• (i) providing a metal substrate;
• (ii) providing an electrode-forming composition (C1) comprising:
• at least one polymer (FF), wherein polymer (FF) is a partially fluorinated fluoropolymer comprising linear sequences of recurring units derived from at least one fluorinated monomer and at least one functional hydrogenated monomer comprising at least one carboxylic acid end group,
• at least one electro-active compound (EA),
• at least one liquid medium (L) comprising at least one organic carbonate or at least one ionic liquid, and
• at least one metal salt (M);
• (iii) applying the composition provided in step (ii) onto the metal substrate provided in step (i) thereby providing an assembly comprising a metal substrate coated with at least one layer consisting of said composition (C1);
• and
• (iv) drying the assembly provided in step (iii);
• wherein said electrode comprises:
• the metal substrate, and
• directly adhered onto said metal substrate, at least one laver (L1) consisting of a composition (C2) comprising:
• at least one partially fluorinated fluoropolymer (FF) comprising linear sequences of recurring units derived from at least one fluorinated monomer and at least one functional hydrogenated monomer comprising at least one carboxylic acid end group,
• at least one electroactive compound (EA),
• at least one liquid medium (L) comprising at least one organic carbonate or at least one ionic liquid, and
• at least one metal salt (M),
• B) the membrane comprises a fluoropolymer hybrid organic/inorganic composite, said fluoropolymer hybrid organic/inorganic composite being obtained by a process comprising hydrolysing and/or condensing a composition comprising:
• at least one partially fluorinated fluoropolymer,
• at least one metal compound (M1) of formula (IV):
• X4-mAYm (IV)
• wherein m is an integer from 1 to 4, A is a metal selected from the group consisting of Si, Ti and Zr, Y is a hydrolysable group and X is a hydrocarbon group, optionally comprising one or more functional groups,
• at least one ionic liquid, and
• at least one metal salt (M).