Method of producing electrode composite material
First Claim
1. A method of preparing a composite material for electrodes, which comprises:
- preparing a solution containing at least one polymer P1 that has an O, N, P or S heteroatom mass content of 15% or higher, at least one polymer P2 that has an O, N, P or S heteroatom mass content of 5% or less, and at least one nonvolatile solvent S1 in a volatile solvent;
preparing a homogeneous suspension of a material C1 conferring electronic conductivity and an active electrode material M1 in a volatile solvent;
preparing a viscous solution by adding the solution of P1, P2 and S1 in a volatile solvent to the homogeneous suspension of C1 and M1 in a volatile solvent; and
producing a film from the viscous solution obtained, wherein;
when the viscous solution is prepared, the nonvolatile solvent S1 uniformly impregnates the polymer P1 in such a way that the polymer P1 and the material C1 conferring electronic conductivity form a dense, homogeneous and continuous phase around the particles of active material M1;
the polymer P2 forms a dispersed phase which contains no or very little material C1 and the morphology of this phase is of the sphere, cylinder, needle or ribbon type and creates porosity;
the polymer P1 is selected from the group consisting of polyethers, polyesters, polyacrylic polymers, polycarbonates, polyimines, polyamides, polyacrylamides, polyurethanes, polyepoxides, polyphosphazenes and polysulfones;
the polymer P2 is selected from the group consisting of vinyl chloride, vinylidene fluoride, vinylidene chloride, tetrafluoroethylene and chlorotrifluoroethylene homopolymers and copolymers, and vinylidene fluoride/hexafluoropropylene copolymers;
the nonvolatile solvent S1 is a polar aprotic solvent consisting of one or more carbonates selected from the group consisting of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ether carbonate and mixtures thereof;
C1 is comprised of graphite, carbon fibers, carbon nanowires, carbon nanotubes, or electronically conductive polymers.
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Abstract
The invention relates to a method for producing a material for a composite electrode.
The method is intended for the preparation of a composite material consisting of an active electrode material M1, a material C1 conferring electronic conductivity, an organic binder and a salt, said binder comprising a polymer P1 having an O, N, P or S heteroatom mass content of 15% or higher, a polymer P2 having an O, N, P or S heteroatom mass content of 5% or less, and a nonvolatile liquid organic solvent S1. It includes a step consisting in preparing a viscous solution containing at least one polymer P1, at least one polymer P2, a material C1, an active electrode material M1 and at least one nonvolatile solvent S1, and a step consisting in forming a film from the viscous solution obtained.
18 Citations
26 Claims
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1. A method of preparing a composite material for electrodes, which comprises:
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preparing a solution containing at least one polymer P1 that has an O, N, P or S heteroatom mass content of 15% or higher, at least one polymer P2 that has an O, N, P or S heteroatom mass content of 5% or less, and at least one nonvolatile solvent S1 in a volatile solvent; preparing a homogeneous suspension of a material C1 conferring electronic conductivity and an active electrode material M1 in a volatile solvent; preparing a viscous solution by adding the solution of P1, P2 and S1 in a volatile solvent to the homogeneous suspension of C1 and M1 in a volatile solvent; and producing a film from the viscous solution obtained, wherein; when the viscous solution is prepared, the nonvolatile solvent S1 uniformly impregnates the polymer P1 in such a way that the polymer P1 and the material C1 conferring electronic conductivity form a dense, homogeneous and continuous phase around the particles of active material M1; the polymer P2 forms a dispersed phase which contains no or very little material C1 and the morphology of this phase is of the sphere, cylinder, needle or ribbon type and creates porosity; the polymer P1 is selected from the group consisting of polyethers, polyesters, polyacrylic polymers, polycarbonates, polyimines, polyamides, polyacrylamides, polyurethanes, polyepoxides, polyphosphazenes and polysulfones; the polymer P2 is selected from the group consisting of vinyl chloride, vinylidene fluoride, vinylidene chloride, tetrafluoroethylene and chlorotrifluoroethylene homopolymers and copolymers, and vinylidene fluoride/hexafluoropropylene copolymers; the nonvolatile solvent S1 is a polar aprotic solvent consisting of one or more carbonates selected from the group consisting of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ether carbonate and mixtures thereof; C1 is comprised of graphite, carbon fibers, carbon nanowires, carbon nanotubes, or electronically conductive polymers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification