SOLID POLYMER ELECTROLYTE COMPRISING A POLYALKENE CARBONATE
The invention concerns a solid polymer electrolyte comprising a polymer matrix comprising at least one ionic salt, the polymer matrix comprising at least one polyalkene carbonate, at least one second polymer different from the polyalkene carbonate polymer, and at least one alkene carbonate coming from the decomposition of the polyalkene carbonate. The present invention also concerns a method for preparing the solid polymer electrolyte and a battery comprising the solid polymer electrolyte.
1 . A solid polymer electrolyte comprising a polymer matrix that comprises at least one ionic salt, wherein the polymer matrix comprises at least one polyalkene carbonate, at least one second polymer other than polyalkene carbonate, and at least the alkene carbonate resulting from the decomposition of polyalkene carbonate.
2 . The solid polymer electrolyte according to claim 1 , characterized in that the polyalkene carbonate is present in an amount of 5-80 mass %, preferably 10-70 mass %, relative to the total mass of the polymers of the matrix.
3 . The solid polymer electrolyte according to claim 1 , wherein the polymer matrix comprises a polyalkene carbonate having a high molar mass and a polyalkene carbonate having a low molar mass relative to one another.
4 . The solid polymer electrolyte according to claim 1 , wherein the ionic salt is selected from the salts of a metal ion, the metal of which belongs to column I of the periodic table.
5 . The solid polymer electrolyte according to claim 1 , wherein the ionic salt is selected from the group consisting of LiBETI, LiC 2 F 5 SO 3 , LiC 4 F 9 SO 3 , LiCF 3 SO 3 , NaI, NaSCN, NaBr, KI, KBr, LiClO 4 , LiBF 4 , LiAsF 6 , LiPF 6 , LiNO 3 , Li(CF 3 SO 2 ) 2 N, Li(CF 3 SO 2 ) 3 C, LiN(SO 2 C 2 F 5 ) 2 , lithium alkyl fluorophosphates, lithium difluoro(oxalato)borate, lithium bis(oxalato) borate, MTFSiLi, STFSiLi, and any mixture thereof.
6 . The solid polymer electrolyte according to claim 1 , wherein the second polymer is selected from polyolefins, polycarbonates, halogenated polymers, acrylic polymers, acrylate polymers, methacrylate polymers, vinyl acetate polymers, polyethers, polyesters, polyamides, aromatic polymers, elastomeric polymers, e.g. HNBR, polyisoprenes, rubbery polymers, and any mixture thereof.
7 . The solid polymer electrolyte according to claim 1 , wherein the matrix comprises no macroseparation between the phase containing the polyalkene carbonate and the phase containing the second polymer.
8 . The solid polymer electrolyte according to claim 1 , wherein the matrix comprises solid mineral or organic fillers.
9 . The solid polymer electrolyte according to claim 1 , wherein the solid polymer electrolyte is in the form of a film having a thickness of less than 1 mm.
10 . The solid polymer electrolyte according to claim 1 , wherein the polymer matrix is obtained by mixing the polyalkene carbonate and the second polymer by melting or by means of a solvent, wherein the polyalkene carbonate and the second polymer are both soluble.
11 . A method for preparing a solid polymer electrolyte according to claim 1 , wherein the method comprises mixing the polyalkene carbonate and the second polymer by melting or by means of a solvent, wherein the polyalkene and the second polymer are both soluble, and partially decomposing the polyalkene carbonate in alkene carbonate in order to obtain a solid polymer electrolyte according to claim 1 .
12 . The method according to claim 11 , wherein the method comprises heating the solid polymer electrolyte.
13 . An electrode comprising at least one solid polymer electrolyte according claim 1 or obtainable by a method according to claim 11 .
14 . A battery comprising at least one solid polymer electrolyte according to claim 1 or obtainable by a method according to claim 11 .
15 . The battery according to claim 14 , characterized in that the battery is a solid polymer electrolyte lithium battery.