Patent ID: 11936048
Assignee: SOLVAY SPECIALTY POLYMERS ITALY S.P.A.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A positive electrode-forming composition (C) comprising:
a) at least one positive electrode active material (AM), wherein the active material (AM) is selected from lithium-containing complex metal oxides of general formula (I)

LiNixM1yM2zY2  (I)

wherein M1 and M2 are the same or different from each other and are transition metals selected from Co, Fe, Mn, Cr and V,
0.5≤x≤1 and wherein y+z=1−x, and
Y denotes a chalcogen;

b) at least one binder (B), wherein binder (B) comprises at least one vinylidene fluoride (VDF) copolymer [polymer (A)] that comprises:
(i) recurring units derived from vinylidene fluoride (VDF);
(ii) recurring units derived from a fluoroalkylvinylether (FVE) monomer, wherein the (FVE) monomer is selected from the group consisting of:
a (halo)fluoroalkylvinylether complying with formula CF2═CFORf1 in which Rf1 is a C1-C12-fluoro-(halo)alkyl group or C1-C12-perfluoro-(halo)alkyl group, optionally comprising at least one halogen atom different from fluorine;
a (halo)fluorooxyalkylvinylether group of complying with formula CF2═CFOROF, with ROF being a C1-C6-(halo)fluorooxyalkyl or C1-C6-per(halo)fluorooxyalkyl group, optionally comprising at least one halogen atom different from fluorine, which comprises one or more than one ethereal oxygen atom; and

(iii) recurring units derived from at least one hydrophilic (meth)acrylic monomer (MA) of formula (II):, wherein each of R1, R2, R3, equal or different from each other, is independently an hydrogen atom or a C1-C3 hydrocarbon group, and ROH is a hydrogen or a C1-C5 hydrocarbon moiety comprising at least one —COOH group,

wherein the total amount of recurring units (ii) and recurring units (iii), when present, in said polymer (A) is of at most 15% by moles, with respect to the total moles of recurring units of polymer (A); and

c) at least one solvent (S).