HYBRID BATTERY BINDER
Disclosed is a composition comprising an ethylene copolymer and a polyetherimide, polyamideimide, polycarbonate, polyetheretherketone, polysulfone or polyethersulfone wherein the ethylene copolymer comprises or is produced from repeat units derived from ethylene and a comonomer selected from the group consisting of an α,β-unsaturated monocarboxylic acid or its derivative, an α,β-unsaturated dicarboxylic acid or its derivative, an epoxide-containing monomer, a vinyl ester, or combinations of two or more thereof; and the composition can further comprise a curing agent to crosslink the ethylene copolymer. The composition is useful as a binder for a lithium ion battery.
1 . A blend composition comprising
(a) an ethylene copolymer or combination thereof comprising copolymerized units of ethylene and a comonomer selected from the group consisting of an α,β-unsaturated monocarboxylic acid or its derivative, an α,β-unsaturated dicarboxylic acid or its derivative, an epoxide-containing monomer, a vinyl ester, or combinations of two or more thereof wherein the polymer contains copolymerized units of 2 to 80 weight % of the comonomer; and
(b) a polymeric material selected from the group consisting of polyetherimide, polyamideimide, polycarbonate, polyetheretherketone, polysulfone and polyethersulfone.
2 . The composition of claim 1 comprising 1 to 80 weight % of the ethylene copolymer, based on the combination of (a) and (b).
3 . The composition of claim 2 comprising 15 to 80 weight % of the ethylene copolymer, based on the combination of (a) and (b)
4 . The composition of claim 1 wherein the comonomer comprises a derivative of an α,β-unsaturated monocarboxylic acid.
5 . The composition of claim 4 wherein the comonomer is an alkyl methacrylate, an alky acrylate, or combinations thereof.
6 . The composition of claim 1 wherein the ethylene copolymer is an ethylene methyl acrylate dipolymer, ethylene ethyl acrylate dipolymer, ethylene butyl acrylate dipolymer, ethylene methyl acrylate glycidyl methacrylate terpolymer, ethylene butyl acrylate glycidyl methacrylate terpolymer, or combinations of two or more thereof.
7 . The composition of claim 1 wherein the ethylene copolymer is an elastomer derived from copolymerization of
(a) from 13 to 50 weight % of ethylene;
(b) from 50 to 80 weight % of an alkyl acrylate; and
(c) from 0 to 7 weight % of a monoalkyl ester of 1,4-butene-dioic acid, wherein all weight percentages are based on total weight of components (a) through (c) in the copolymer.
8 . The composition of claim 1 , wherein (b) comprises a polyetherimide.
9 . The composition of claim 1 further comprising a curing agent.
10 . The composition of claim 9 wherein the curing agent comprises trimethylolpropane triglycidyl ether, epoxidized soybean oil, epoxidized linseed oil, m-phenylene diamine, 4,4′-methylenedianiline, hexamethylene diamine, diethylaminopropylamine, dipropylenediamine, n-aminoethyl piperazine, diethylene triamine. triethylene tetramine, tetraethylene pentamine, isophorone diamine, 3-aminophenyl sulfone, 4-aminophenyl sulfone, xylylenediamine and its adducts, 5-amino-1,3,3-trimethylcyclohexanemethylamine, pyromellitic anhydride, benzophenone tetracarboxylic anhydride, ethylene glycol bistrimellitate, glycerol tristrimellitate, alkylstyrene-maleic anhydride copolymer, chlorendic anhydride, polyazelaic polyanhydride, polyether amines, 1,2,4-benzenetricarboxylic anhydride, bisphenol A, bisphenol A esters, bisphenol A diglycidyl ether, trimethylolpropane tris[poly(propylene glycol), amine terminated]ether, polyamide made from fatty dimer acid, polyamine, triethylenediamine, 2,4,6-tris(dimethylaminomethyl)phenol, liquid polymercaptan, polysulfide resin, a carbodiimide or a derivative thereof, an isocyanide or a derivative thereof, or combinations of two or more thereof.
11 . The composition of claim 9 wherein the curing agent comprises a diamine or polyamine.
12 . The composition of claim 1 wherein the ethylene copolymer is crosslinked.
13 . The blend composition of claim 1 further comprising a metal oxide, mixed metal oxide, metal phosphate, metal salt, or combinations of two or more thereof, and optionally an electrical conductivity aid.
14 . A method for preparing the blend composition of claim 1 comprising
(1) preparing a mixture comprising an ethylene copolymer or combination thereof comprising copolymerized units of ethylene and a comonomer selected from the group consisting of an α,β-unsaturated monocarboxylic acid or its derivative, an α,β-unsaturated dicarboxylic acid or its derivative, an epoxide-containing monomer, a vinyl ester, or combinations of two or more thereof; wherein the polymer contains copolymerized units of 2 to 80 weight % of the comonomer and an organic solvent;
(2) preparing a mixture comprising a polymeric material selected from the group consisting of polyetherimide, polyamideimide, polycarbonate, polyetheretherketone, polysulfone and polyethersulfone, and an organic solvent;
(3) combining the mixture of the ethylene copolymer and the mixture of the polymeric material.
15 . The method of claim 12 wherein the polymeric material comprises a polyetherimide.
16 . The method of claim 14 wherein the solvents comprise diethyl ether, pentane, cyclopentane, hexane, benzene, heptane, cyclohexane, dimethyl cyclohexane, heptane, toluene, octane, ethyl benzene, xylene, 1,4-dioxane, nonane, decane, tetrahydronaphthalene, dodecane, decaline, acetone, methyl ethyl ketone, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, hexyl acetate, methyl propionate, butyric acid methyl ester, propylene carbonate, γ-butyrolactone, cyclohexyl acetate, 2-methoxyethyl acetate, ethylene glycol methyl ether acetate, 2-ethoxyethanol acetate, 2-butoxyethanol acetate, diethylene glycol monomethyl ether acetate, propylene glycol methyl ether acetate, ethyl acetoacetate, N-methyl-2-pyrrolidone, N,N-dimethyl formamide, N,N-diethyl formamide, N,N-dimethyl acetamide, N,N-diethyl acetamide or combinations thereof.
17 . The method of claim 16 wherein the solvents comprise ethyl acetate or N-methyl-2-pyrrolidone.
18 . The method of claim 14 further comprising mixing the blend composition with a metal oxide, mixed metal oxide, metal phosphate, metal salt, or combinations of two or more thereof, and optionally an electrical conductivity aid.
19 . An electrochemical cell comprising the composition of claim 1 .
20 . The electrochemical cell of claim 19 comprising a negative electrode (anode), a positive electrode (cathode), an electrolyte and a separator.
21 . The electrochemical cell of claim 20 wherein the positive electrode comprises a binder composition and a cathode active material wherein the binder composition is as characterized in claim 1 ; and the cathode active material comprises a lithiated transition metal oxide or lithiated transition metal phosphate, or combinations thereof.
22 . The electrochemical cell of claim 20 wherein the negative electrode comprises a binder composition and an anode active material wherein the binder composition is as characterized in claim 1 ; and the anode active material comprises carbon, lithium titanate, Si, Sn, Sb, or alloys or precursors to lithium alloys with Si, Sn, or Sb.
23 . A lithium ion battery electrode comprising a binder composition and a cathode active material wherein the binder composition is as characterized in claim 1 ; and the cathode active material comprises a lithiated transition metal oxide or lithiated transition metal phosphate, or combinations thereof.
24 . A lithium ion battery electrode comprising a binder composition and an anode active material wherein the binder composition is as characterized in claim 1 ; and the anode active material comprises carbon, lithium titanate, Si, Sn, Sb, or alloys or precursors to lithium alloys with Si, Sn, or Sb.