Composite material for use in the construction of electrochemical batteries and supercapacitors comprising active electrode material, an electroconductive material, an organic binder and a salt

摘要

A composite material comprises an active electrode material (M1), a material (C1) giving electronic conductivity, an organic binder and a salt. The binder is a polymer (P1) containing = 15% oxygen (O), nitrogen (N), phosphorus (P) or sulphur (S), a polymer (P2) containing =5% O, N, P or S, and a non-volatile organic liquid solvent (S1). Polymer P1 and material C1 give electroconductivity forming a continuous and homogeneous dense phase containing grains of active material, and polymer P2 is a disperse phase. A composite material comprises an active electrode material (M1), a material (C1) giving electronic conductivity, an organic binder and a salt. The binder is a polymer (P1) containing = 15% oxygen (O), nitrogen (N), phosphorus (P) or sulphur (S), a polymer (P2) containing =5% O, N, P or S, and a non-volatile organic liquid solvent (S1). Polymer P1 and material C1 give electroconductivity forming a continuous and homogeneous dense phase containing grains of active material, and polymer P2 is a disperse phase containing little or no C1 material of spherical, cylindrical or acicular morphology, or a porous band. Independent claims are included for: (1) an electrode composite containing composite material as above; (2) a process for preparation of the composite material involving preparation of a viscous solution of at least one polymer P1, at least one polymer P2, a material C1 giving electroconductivity, an active electrode material M1 and at least one nonvolatile solvent S1, then formation of a film starting from the viscous solution; (3) a battery consisting of positive and negative electrodes separated by an electrolyte comprising a lithium salt as described below; and (4) a supercapacitor comprising two electrodes separated by an electrolyte where at least one of the electrodes is as described below.