Battery comprising a polymer containing disulfide bonds

Abstract

The present invention relates to the use, in a Li-ion secondary battery, of an amorphous polymer P1 comprising at least one -(S-R-S)-(S-R-S)- segment.

Description

[0001]Description Title: Battery comprising a polymer containing disulfide bonds Technical field of the invention The present invention relates generally to the field of electrical energy storage in rechargeable lithium secondary batteries such as Li-ion or Li-S. More specifically, the invention relates to the use of a polymer containing disulfide bonds in a lithium battery. Technological background of the invention The next generation of lithium secondary batteries aims to use a solid electrolyte instead of a liquid electrolyte. This allows for higher energy density and improved safety compared to traditional lithium batteries. All-solid-state batteries are also more resistant to thermal runaway, which is a major concern in traditional lithium batteries.They have the potential to enable further miniaturization and integration of electronic devices, as well as improve the range and safety of electric vehicles. However, the commercialization of solid-state batteries is still in its early stages, and technical challenges remain before they can be widely adopted. Solid polymer electrolytes have been investigated as alternative electrolytes for Li-ion batteries due to their good mechanical strength, high ionic conductivity, and safety advantages. They consist of a polymer matrix containing conductive salts of Li ions. The polymers form a flexible and stable membrane that can separate the cathode and anode of the battery, while allowing lithium ions to move freely through the electrolyte.This can improve battery performance and stability, but some challenges remain, such as a low Li-ion transfer number and a limited operating temperature range. One of the most widely used polymers is polyethylene oxide (PEO). Due to its crystalline nature (Tm between 60 and 70 °C), PEO suffers from low ionic conductivity at room temperature. Therefore, it is primarily used at high temperatures to increase conductivity (in molten form). Operating temperatures are significantly impacted and limited to high-temperature applications. However, an all-solid-state battery may be necessary in countries with low winter temperatures and requires conductivity even below 0 °C. Therefore, there is still a need to develop new all-solid-state batteries.The present invention provides a solution, at least in part, to the problems identified above. Summary of the invention: According to a first aspect, the present application relates to the use in a secondary Li-ion battery of a polymer P1 characterized in that it comprises at least one segment –(SRS)-(SRS)-, where R is, independently for each unit –(SRS)-, a hydrocarbon substituent having a molecular mass less than 1000 g / mol, and in that said polymer P1 is amorphous. The present invention improves the efficiency of all-solid-state batteries by allowing their use over a wide temperature range. The use of an amorphous polymer eliminates the need for a battery heating step, as is the case with PEO, while still achieving satisfactory conductivity.According to a preferred embodiment, said polymer P1 is used as a binder for an electrode, or is one of the components of an electrode composition, an electrode coating, a separator, or a solid electrolyte. According to a preferred embodiment, said polymer P1 has a molar mass greater than 50,000 g / mol measured according to the method described in this application. According to a preferred embodiment, said polymer P1 has a conductivity greater than 1.10. -7 S / cm measured at a temperature of 25°C according to the method detailed in this application. In a preferred embodiment, in said polymer P1, R is a hydrocarbon comprising at least one ether, ester, or carbonyl functional group. In a preferred embodiment, in said polymer P1, R has the formula -[R 1 -X-]n-[Y]m- in which R 1 is, independently for each unit n, selected from the group consisting of C1-C 10alkyl, C3-C10 cycloalkyl, C6-C12 aryl; X is O, C(O), C(O)O, OC(O); n is an integer from 1 to 10; Y is, independently for each unit m, selected from the group consisting of C1-C10 alkyl, C3-C10 cycloalkyl, C6-C12 aryl; m is an integer from 0 to 10. According to a preferred embodiment, in said polymer P1, R is of the formula -R2-O-R3-O-R4- in which R 2 , R 3 and R 4 , are independently of each other, selected from the group consisting of C1-C 10 alkyl, C3-C 10 cycloalkyl, C6-C 12aryl. According to a preferred embodiment, said polymer P1 is poly(1,8-dimercapto-3,6-dioxaoctane). According to another aspect, the present invention provides a solid electrolyte comprising a lithium salt and said polymer P1 as defined in this application. According to a preferred embodiment, said lithium salt is selected from the group consisting of LiCF3SO3, LiPF6, LiClO4, LiBF4, LiB(C2O4)2, LiN(SO2F)2, LiN(SO2CF3)2, LiN(SO2C2F3)2, LiN(SO2C2F5)2, LiN(SO2F)(SO2CF3), LiN(SO2F)(SO2C2F5), LiN(SO2CF3)(SO2C2F5), LiAsF6, LiBF2C2O4, LiNO3, LiPF3(CF2CF3)3, LiTDI or a mixture thereof. In another aspect, the present invention provides a film comprising, preferably, said solid electrolyte according to the present invention. In another aspect, the present invention provides an all-solid-state battery comprising a cathode, an anode, and a separator comprising said film according to the present invention.According to another aspect, the present invention provides a separator comprising said polymer P1 as defined in this application. According to another aspect, the present invention provides a binder comprising said polymer P1 as defined in this application. According to another aspect, the present invention provides an electrode comprising an active material, a binder according to the present invention, and optionally a conductive material. According to a preferred embodiment, said active material is selected from the group consisting of: - A cathode active material selected from the group consisting of LiCoO2, Li(Ni, Co, Al)O2, Li. (1+ x) Neither a Mn b Co c(x represents a real number of 0 or more, a = 0.8, 0.6, 0.5, or 1 / 3, b = 0.1, 0.2, 0.3, or 1 / 3, c = 0.1, 0.2, or 1 / 3), LiNiO2, LiMn2O4, LiCoMnO4, Li3NiMn3O3, Li3Fe2(PO4)3, Li3V2(PO4)3, a LiMn spinel substituted with a different element having a composition represented by Li1+xMn2-x-yMyO4, M representing at least one metal chosen from Al, Mg, Co, Fe, Ni, and Zn, x and y independently representing a real number between 0 and 2, lithium titanate LixTiOy where x and y independently representing a real number between 0 and 2, and a lithium metal phosphate having a composition represented by LiMPO4, M representing Fe, Mn, Co, or Ni; - An active anode material selected from the group consisting of lithium alloy, lithium metal, a metal oxide, a carbon material such as graphite or hard carbon, silicon and its derivatives SiOx, silicone, graphite-silicon composite, a silicon alloy and Li4Ti5O12 or a mixture thereof.According to another aspect, the present invention provides an all-solid-state battery comprising a cathode, an anode, and a separator comprising said film according to the present invention. According to another aspect, the present invention provides an electrode coating consisting of said polymer P1 as defined in this application, a lithium salt, and a conductivity additive. According to another aspect, the present invention provides a battery comprising an electrode according to the present invention. Brief description of the figures: Figure 1 shows the cyclic volt-amperometry of a film according to the invention. Detailed description of the invention: The present invention provides a new conductive polymer suitable for use in Li-ion batteries.Unlike batteries using Power over Ethernet (POE), the use of the polymer according to the present invention in a Li-ion battery, preferably an all-solid-state battery, allows for its operation at room temperature or even at low temperatures. Polymer P1: According to a first aspect, the use of a polymer P1 in a secondary Li-ion battery is provided. Preferably, said polymer P1 is amorphous. Preferably, said polymer P1 is used as a binder for an electrode, or is a component of an electrode composition, a cathode coating, an anode coating, a separator, or a solid electrolyte. As mentioned above, said polymer P1 comprises at least one segment –(SRS)-(SRS)-, where R is, independently for each unit –(SRS)-, a hydrocarbon substituent having a molecular mass of less than 1000 g / mol.Advantageously said substituent R has a molecular mass less than 950 g / mol, preferably said substituent R has a molecular mass less than 900 g / mol, more preferably said substituent R has a molecular mass less than 850 g / mol, in particular said substituent R has a molecular mass less than 800 g / mol, more particularly said substituent R has a molecular mass less than 750 g / mol, preferably said substituent R has a molecular mass less than 700 g / mol, advantageously preferred said substituent R has a molecular mass less than 650 g / mol, preferably preferred said substituent R has a molecular mass less than 600 g / mol, more preferably preferred said substituent R has a molecular mass less than 550 g / mol, particularly preferred said substituent R has a molecular mass less than 500 g / mol.Preferably, in said polymer P1, R is a hydrocarbon comprising at least one ether, ester or carbonyl functional group. An ether functional group has the formula A. 1 -OA 2 An ester functional group has the formula A 1 -C(O)OA 2 or A 1 -OC(O)-A 2 A carbonyl functional group has the formula A 1 -C(O)-A 2 Substituents A 1 and A 2 are preferably hydrocarbons comprising from 1 to 30 carbon atoms, in particular from 1 to 25 carbon atoms, more particularly from 1 to 20 carbon atoms. In said polymer P1, R may be of the formula -[R1-X-]n-[Y]m- in which R 1is, independently for each unit n, selected from the group consisting of C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl; X is O, C(O), C(O)O, OC(O); n is an integer from 1 to 20; Y is, independently for each unit m, selected from the group consisting of C1-C 20 alkyl, C3-C10 cycloalkyl, C6-C12 aryl; m is an integer from 0 to 20. Advantageously, in said polymer P1, R can be of the formula -[R1-X-]n-[Y]m- in which R 1 is, independently for each unit n, selected from the group consisting of C1-C15alkyl, C3-C15 cycloalkyl, C6-C15 aryl; X is O, C(O), C(O)O, OC(O); n is an integer from 1 to 15; Y is, independently for each unit m, selected from the group consisting of C1-C15alkyl, C3-C15 cycloalkyl, C6-C15 aryl; m is an integer from 0 to 15. Preferably, in said polymer P1, R can be of the formula -[R1-X-]n-[Y]m- in which R 1is, independently for each unit n, selected from the group consisting of C1-C 12 alkyl, C3-C12 cycloalkyl, C6-C12 aryl; X is O, C(O), C(O)O, OC(O); n is an integer from 1 to 12; Y is, independently for each unit m, selected from the group consisting of C1-C12 alkyl, C3-C12 cycloalkyl, C6-C12 aryl; m is an integer from 0 to 12. More preferably, in said polymer P1, R can be of the formula -[R1-X-]n-[Y]m- in which R 1 is, independently for each unit n, selected from the group consisting of C1-C10 alkyl, C3-C10 cycloalkyl, C6-C12 aryl; X is O, C(O), C(O)O, OC(O); n is an integer from 1 to 10; Y is, independently for each unit m, selected from the group consisting of C1-C 10 alkyl, C3-C10 cycloalkyl, C6-C12 aryl; m is an integer from 0 to 10. In particular, in said polymer P1, R can be of the formula -[R1-X-]n-[Y]m- in which R 1is, independently for each unit n, selected from the group consisting of C1-C8 alkyl, C3-C8 cycloalkyl, C6-C10 aryl; X is O, C(O), C(O)O, OC(O); n is an integer from 1 to 8; Y is, independently for each unit m, selected from the group consisting of C1-C8 alkyl, C3-C8 cycloalkyl, C6-C10 aryl; m is an integer from 0 to 8. More particularly, in said polymer P1, R can be of the formula -[R1-X-]n-[Y]m- in which R 1 is, independently for each unit n, selected from the group consisting of C1-C5 alkyl, C3-C5 cycloalkyl, C6-C8 aryl; X is O, C(O), C(O)O, OC(O); n is an integer from 1 to 5; Y is, independently for each unit m, selected from the group consisting of C1-C5 alkyl, C3-C5 cycloalkyl, C6-C8 aryl; m is an integer from 0 to 5. Preferably, in said polymer P1, R can be of the formula -[R1-X-]n-[Y]m- in which R 1is, independently for each unit n, selected from the group consisting of C1-C5 alkyl, C6-C8 aryl; X is O, C(O), C(O)O, OC(O); n is an integer from 1 to 5; Y is, independently for each unit m, selected from the group consisting of C1-C5 alkyl, C6-C8 aryl; m is an integer from 0 to 5. In a preferred embodiment, in said polymer P1, R has the formula -R 2 -GOLD 3 -GOLD 4 - in which R 2 , R 3 and R 4 , are independently of each other, selected from the group consisting of C1-C 20 alkyl, C3-C 20 cycloalkyl, C6-C 20 aryl. Advantageously, in said polymer P1, R has the formula -R2-O-R3-O-R4- in which R2, R3 and R 4 , are independently of each other, selected from the group consisting of C1-C15 alkyl, C3-C15 cycloalkyl, C6-C15 aryl. Preferably, in said polymer P1, R has the formula -R2-O-R3-O-R4- in which R2, R3 and R4 , are independently of each other, selected from the group consisting of C1-C12 alkyl, C3-C12 cycloalkyl, C6-C12 aryl. More preferably, in said polymer P1, R has the formula -R2-O-R3-O-R4- in which R 2 , R 3 and R 4 , are independently of each other, selected from the group consisting of C1-C 10 alkyl, C3-C 10 cycloalkyl, C6-C 12 aryl. In particular, in said polymer P1, R has the formula -R2-O-R3-O-R4- in which R2, R3, and R4 are independently selected from the group consisting of C1-C8 alkyl, C3-C8 cycloalkyl, and C6-C10 aryl. More particularly, in said polymer P1, R has the formula -R2-O-R3-O-R4- in which R2, R 3 and R 4, are independently of each other, selected from the group consisting of C1-C5 alkyl, C3-C5 cycloalkyl, C6-C8 aryl. Preferably, in said polymer P1, R has the formula -R2-O-R3-O-R4- in which R2,R 3 and R 4 , are independently of each other, selected from the group consisting of C1-C5 alkyl, C6-C8 aryl. Advantageously preferred, said polymer P1 comprises, advantageously is constituted, repeating units of formula –(-S-R2-O-R3-O-R4-SS-R2-O-R3-O-R4-S-)- in which R 2 , R 3 and R 4 are selected from the group consisting of C1-C5 alkyl, C6-C8 aryl. Preferably, said polymer P1 comprises, advantageously is constituted, repeating units of formula –(-S-R2-O-R3-O-R4-SS-R2-O-R3-O-R4-S-)- in which R 2 , R 3 and R 4are selected from the group consisting of C1-C3 alkyl groups. More preferably, said polymer P1 comprises, advantageously is constituted, repeating units of formula –(-S-R2-O-R3-O-R4-SS-R2-O-R3-O-R4-S-)- in which R 2 , R 3 and R 4are selected from the group consisting of CH2CH2 and CH(CH3)CH2. More particularly preferred, said polymer P1 is poly(1,8-dimercapto-3,6-dioxaoctane). Said polymer P1 may have a molar mass greater than 50,000 g / mol. Advantageously, said polymer P1 may have a molar mass greater than 55,000 g / mol. Preferably, said polymer P1 may have a molar mass greater than 60,000 g / mol. More preferably, said polymer P1 may have a molar mass greater than 65,000 g / mol. In particular, said polymer P1 may have a molar mass greater than 70,000 g / mol. More particularly, said polymer P1 may have a molar mass greater than 75,000 g / mol. Preferably, said polymer P1 may have a molar mass greater than 80,000 g / mol. Advantageously preferred, said polymer P1 may have a molar mass greater than 85000 g / mol.Preferably, polymer P1 may have a molar mass greater than 90,000 g / mol. Particularly preferred, polymer P1 may have a molar mass greater than 95,000 g / mol. Polymer P1 may have a molar mass greater than 100,000 g / mol. Advantageously, polymer P1 may have a molar mass greater than 110,000 g / mol. Preferably, polymer P1 may have a molar mass greater than 120,000 g / mol. More preferably, polymer P1 may have a molar mass greater than 130,000 g / mol. In particular, polymer P1 may have a molar mass greater than 140,000 g / mol. More particularly, polymer P1 may have a molar mass greater than 150,000 g / mol. Preferably, said polymer P1 may have a molar mass greater than 160,000 g / mol. Advantageously, said polymer P1 may have a molar mass greater than 170,000 g / mol.Preferably, polymer P1 may have a molar mass greater than 180,000 g / mol. Particularly preferred, polymer P1 may have a molar mass greater than 190,000 g / mol. Polymer P1 may have a molar mass greater than 200,000 g / mol. Advantageously, polymer P1 may have a molar mass greater than 110,000 g / mol. Preferably, polymer P1 may have a molar mass greater than 220,000 g / mol. More preferably, polymer P1 may have a molar mass greater than 230,000 g / mol. In particular, polymer P1 may have a molar mass greater than 240,000 g / mol. More particularly, polymer P1 may have a molar mass greater than 250,000 g / mol. Preferably, said polymer P1 may have a molar mass greater than 260,000 g / mol. Advantageously, said polymer P1 may have a molar mass greater than 270,000 g / mol.Preferably, polymer P1 may have a molar mass greater than 280,000 g / mol. Particularly preferred, polymer P1 may have a molar mass greater than 290,000 g / mol. Polymer P1 may have a molar mass less than 10,000,000 g / mol, advantageously less than 9,000,000 g / mol, preferably less than 8,000,000 g / mol, more preferably less than 5,000,000 g / mol, and in particular less than 2,500,000 g / mol. The weight-average molecular mass was measured on a Waters Alliance 2695-I5 instrument with two Waters 2414 RI and Waters 2487 Dual UV 254 nm detectors and equipped with two PL gel 10 µm Mixed-B 300*7.5 mm columns. The flow rate was 1 mL / min, the eluent was BHT-stabilized THF, and the sample concentration was 1 g / L dissolved at room temperature for at least 4 hours. The injected volume was 5 µL. Calibration was performed using Easivial PS-H standards from 580 to 6545000 g / mol.The polymer P1 may have a conductivity greater than 1 x 10⁻⁷ S / cm measured at a temperature of 25°C according to the method detailed in this application. Advantageously, the polymer P1 may have a conductivity greater than 2 x 10⁻⁷ S / cm. Preferably, the polymer P1 may have a conductivity greater than 3 x 10⁻⁷ S / cm. More preferably, the polymer P1 may have a conductivity greater than 4 x 10⁻⁷ S / cm. In particular, the polymer P1 may have a conductivity greater than 5 x 10⁻⁷ S / cm. More particularly, the polymer P1 may have a conductivity greater than 6 x 10⁻⁷ S / cm. Preferably, the polymer P1 may have a conductivity greater than 7 x 10⁻⁷ S / cm. Advantageously, the polymer P1 may have a conductivity greater than 8 x 10⁻⁷ S / cm. In a preferentially preferred manner, said polymer P1 may have a conductivity greater than 9.10-7 S / cm.In a particularly preferential manner, the said polymer P1 can have a conductivity greater than 1.10. -6S / cm. Said polymer P1 may have a conductivity greater than 2 x 10⁻⁶ S / cm measured at a temperature of 25°C according to the method detailed in this application. Advantageously, said polymer P1 may have a conductivity greater than 3 x 10⁻⁶ S / cm. Solid electrolyte. According to another aspect of the present invention, a solid electrolyte is provided. The solid electrolyte comprises a lithium salt and the polymer P1 as defined in this application. The lithium salt may be selected from the group consisting of LiCF3SO3, LiPF6, LiClO4, LiBF4, LiB(C2O4)2, LiN(SO2F)2, LiN(SO2CF3)2, LiN(SO2C2F3)2, LiN(SO2C2F5)2, LiN(SO2F)(SO2CF3), LiN(SO2F)(SO2C2F5), LiN(SO2CF3)(SO2C2F5), LiAsF6, LiBF2C2O4, LiNO3, LiPF3(CF2CF3)3, LiTDI or a mixture thereof. Preferably, said lithium salt may be selected from the group consisting of LiCF3SO3, LiPF6, LiClO4, LiBF4, LiB(C2O4)2, LiN(SO2F)2, LiN(SO2CF3)2, LiN(SO2C2F3)2, LiN(SO2C2F5)2, LiTDI or a mixture thereof.In particular, said lithium salt may be selected from the group consisting of LiCF3SO3, LiPF6, LiClO4, LiBF4, LiN(SO2F)2, LiN(SO2CF3)2, LiN(SO2C2F3)2, LiTDI, or a mixture thereof. Said solid electrolyte may be in the form of a film. Thus, the present invention relates to a film comprising, preferably consisting of, said solid electrolyte according to the present application. In said film, said polymer P1 represents 70% by weight of the total weight of said film, advantageously said polymer P1 represents 75% by weight of the total weight of said film, preferably said polymer P1 represents 80% by weight of the total weight of said film, more preferably said polymer P1 represents 85% by weight of the total weight of said film, particularly said polymer P1 represents 90% by weight of the total weight of said film, more particularly said polymer P1 represents 95% by weight of the total weight of said film.The supplement preferably comprises the lithium salt and optionally a plasticizer. The plasticizer may be selected from the group consisting of vinyllidene carbonate, fluoroethylene carbonate (FEC), 4-fluoro-1,3-dioxolan-2-one, trans-4,5-difluoro-1,3-dioxolan-2-one, ethylene carbonate (EC), propylene carbonate, (2-cyanoethyl)triethoxysilane, 3-methoxypropionitrile, sulfolane, triethyl phosphate, γ-butyrolactone, ethers such as polyethylene glycol dimethyl ethers, in particular diethylene glycol dimethyl ether (EG2DME), triethylene glycol dimethyl ether (EG3DME), and tetraethylene glycol dimethyl ether (EG4DME), or ionic liquids. An ionic liquid is a salt that is liquid at room temperature. An ionic liquid has a melting point below 100°C under atmospheric pressure.It is formed by the association of an organic cation and an anion whose ionic interactions are sufficiently weak that they do not form a solid. Examples of cations in ionic liquids include ammonium, sulfonium, pyridinium, pyrrolidinium, imidazolium, imidazolinium, phosphonium, guanidinium, piperidinium, thiazolium, triazolium, oxazolium, pyrazolium, and mixtures thereof. In one embodiment, this cation may include a C1-C30 alkyl group, such as 1-butyl-1-methylpyrrolidinium, 1-ethyl-3-methylimidazolium, N-methyl-N-propylpyrrolidinium, or N-methyl-N-butylpiperidinium.According to one embodiment, the anions associated with them are chosen from: imides, in particular bis(fluorosulfonyl)imide and bis(trifluoromethanesulfonyl)imide; borates; phosphates; phosphinates and phosphonates, in particular alkyl-phosphonates; amides, in particular dicyanamide; aluminates, in particular tetrachloroaluminate; halides (such as bromide, chloride, iodide anions); cyanates; acetates (CH3COO-), in particular trifluoroacetate; sulfonates, in particular methanesulfonate (CH3SO3-), trifluoromethanesulfonate; and sulfates, in particular hydrogen sulfate; an acrylate or a methacrylate.In a preferred embodiment, the anions of the ionic liquid are selected from tetrafluoroborate (BF4-), bis(oxalato)borate (BOB-), hexafluorophosphate (PF6-), hexafluoroarsenate (AsF6-), triflate or trifluoromethylsulfonate (CF3SO3-), bis(fluorosulfonyl)imide (FSI-), bis-(trifluoromethanesulfonyl)imide (TFSI-), nitrate (NO3-), 4,5-dicyano-2-(trifluoromethyl)imidazole (TDI-), an acrylate, or a methacrylate. In a particular embodiment, said anion of the ionic liquid is selected from TDI-, FSI-, TFSI-, PF6-, BF4-, NO3-, BOB-, CH2=CHCOO-. In one embodiment, said anion of the ionic liquid is FSI-. The said plasticizer is a mixture of at least one ionic liquid and at least one solvent with a boiling point above 100°C, preferably above 110°C, more preferably above 125°C, in particular above 150°C, more particularly above 160°C.Plasticizers enable improved properties of conductivity, electrochemical stability, thermal stability, electrode compatibility, and capacitance retention compared to conventional liquid electrolytes. Examples of plasticizers according to the invention are the following mixtures: 1-ethyl-3-methylimidazolium-FSI and EC, 1-ethyl-3-methylimidazolium-FSI and tetraethylene glycol dimethyl ether, 1-ethyl-3-methylimidazolium-FSI and EC and FEC, 1-butyl-1-methylpyrrolidinium-FSI and tetraethylene glycol dimethyl ether, 1-butyl-1-methylpyrrolidinium-FSI and EC and FEC, N-propyl-N-methylpyrrolidinium and tetraethylene glycol dimethyl ether, 1-ethyl-3-methylimidazolium-TFSI and FEC, 1-ethyl-3-methylimidazolium-FSI, 1-butyl-1-methylpyrrolidinium-FSI. Said film can be prepared by conventional techniques known to those skilled in the art, such as solvent casting or extrusion.The solid electrolyte may also include selected inorganic particles from the group consisting of: - lithium tin phosphorus sulfide (“lsps”) such as Li10SnP2S12; - Lithium phosphorus sulfide (“lps”) of formula (Li2S)x(P2S5)y, wherein x+ y=1 and 0≤ x ≤ 1, Li7P3S. 11 , Li7PS6, Li4P2S6, Li 9,6 P3S 12 and Li3PS4; -LPS doped such as Li2CuPS4, Li1+2xZn1-xPS4, in which 0 ≤ x ≤ 1, Li3.33Mg0.33P2S6, and Li4- 3x Sc xP2S6, in which 0 ≤ x ≤ 1; -Lithium sulfide phosphorus oxygen ("LPSO") of formula LixPySzO, in which 0.33≤ x ≤ 0.67, 0.07 ≤ y ≤ 0.2, 0.4 ≤ z ≤ 0.55, 0 ≤ w ≤ 0.15; -Lithium sulfide phosphorus ("LXPS") with x Si, Ge, Sn, As, Al, such as Li10GeP2S12 or Li10SiP2S12; - Lithium phosphorus sulfide oxygen ("LXPSO") with x Si, Ge, Sn, As, Al; - Lithium silica sulfide ("LSS") such as Li2S-P2S5-SiS2, Li2S-P2S5-SiS2-LiCl, Li2S-SiS2-P2S5, Li2S-SiS2-P2S5-LiI, Li9.54Si1.74P1.44S11.7Cl0.3; - Li4PS4Cl, Li15P3S16Cl3, Li7P2S8Cl and Li7P2S8I; - Materials of formula Li6PS5Y in which Y is Cl, Br or I such as; Li6-xPS5-xY1+x, in which 0 ≤ x ≤ 0.5; preferably Li6PS5Cl; and mixtures thereof. According to another aspect of the present invention, a battery is provided. The battery comprises a cathode, an anode, and a separator comprising the polymer P1 according to the present invention. Preferably, the battery is a lithium battery.The polymer P1 may be in the form of a film. The separator may comprise a support on which the film according to the present invention is disposed. The polymer P1 may also be in the form of a coating covering a support. The support may be selected from polyolefins, polyethylene terephthalate, polybutylene terephthalate, polyester, polyacetal, polyamide, polycarbonate, polyimide, polyetheretherketone, polyethersulfone, poly(phenylene oxide), poly(phenylene sulfide), polyethylene naphthalene, or mixtures thereof. The separator may contain inorganic particles. The addition of inorganic particles may contribute to heat resistance, improved mechanical properties, and possibly improved conductivity or dendrite resistance. In one embodiment, the inorganic particles are selected from the group consisting of: BaTiO3, Pb(Zr,Ti)O3, Pb. 1-xLa x Zr y O3(0 <x<1, 0<y<1), PbMg 1 / 3 Nb 2 / 3O3, PbTiO3, hafnium (HfO or HfO2), SrTiO3, SnO2, CeO2, MgO, NiO, CaO, ZnO, Y2O3, bohemite (γ-AlO(OH)), Al2O3, TiO2, SiC, ZrO2, boron silicate, BaSO4, nano-clays, LLZO (lithium lanthanum zirconium oxide), Li3PO4, SiO2, LATP (LiAlTiPO4), LTO (lithium titanate oxide) and its derivatives, or mixtures thereof. The mass content of inorganic particles may be between 10 and 95% based on the total weight of said inorganic particles and said polymer P1. Said separator may also include a conductivity additive. This can be an organic molecule or a mixture of organic molecules capable of swelling the fluorinated polymer without dissolving it and having a dielectric constant greater than 1. According to one embodiment, said conductivity additive is chosen from linear or cyclic ethers, esters, lactones or ketones, nitriles, carbonates and ionic liquids.By way of non-limiting examples, among the ethers, one can cite linear or cyclic ethers, such as dimethoxyethane (DME), the methyl ethers of oligoethylene glycols of 2 to 5 oxyethylene units, dioxolane, dioxane, dibutyl ether, tetrahydrofuran, and mixtures thereof. Among the esters, one can cite phosphoric acid esters or sulfite esters. Examples include methyl formate, methyl acetate, methyl propionate, ethyl acetate, butyl acetate, or mixtures thereof. Among the lactones or ketones, one can notably cite cyclohexanone or gamma-butyrolactone.Examples of nitriles include acetonitrile, pyruvonitrile, propionitrile, methoxypropionitrile, dimethylaminopropionitrile, butyronitrile, isobutyronitrile, valeronitrile, pivalonitrile, isovaleronitrile, glutaronitrile, methoxyglutaronitrile, 2-methylglutaronitrile, 3-methylglutaronitrile, adiponitrile, malononitrile, and mixtures thereof.Examples of carbonates include cyclic carbonates such as ethylene carbonate (EC) (CAS: 96-49-1), propylene carbonate (PC) (CAS: 108-32-7), butylene carbonate (BC) (CAS: 4437-85-8), dimethyl carbonate (DMC) (CAS: 616-38-6), diethyl carbonate (DEC) (CAS: 105-58-8), methylethyl carbonate (EMC) (CAS: 623-53-0), diphenyl carbonate (CAS 102-09-0), methylphenyl carbonate (CAS: 13509-27-8), dipropyl carbonate (DPC) (CAS: 623-96-1), and methylpropyl carbonate (MPC). (CAS: 1333-41-1), ethyl propyl carbonate (EPC), vinylene carbonate (VC) (CAS: 872-36-6), fluoroethylene carbonate (FEC) (CAS: 114435-02-8), trifluoropropylene carbonate (CAS: 167951-80-6), or mixtures thereof. Among the liquid ionics, examples include EMIM:FSi, PYR:FSI, EMIM:TFSI, PYR:TFSI, EMIM:BOB, PYR:BOB, EMIM:TDI, PYR:TDI, EMIM:BF4, and PYR:BF4.EMIM refers to 1-ethyl-3-methylimidazolium. PYR refers to pyrrolidinium. BOB refers to bis(oxalato)borate. TDI refers to 2-trifluoromethyl-4,5-dicyanoimidazolate. FSI refers to bis(fluorosulfonyl)imidide. TFSI refers to bis-(trifluoromethanesulfonyl)imide. Electrode Binder. According to another aspect of the present invention, said polymer P1 may also be a binder. Said binder is used in an electrode composition, itself used for the implementation of an electrode. Said electrode composition may comprise an active material, a binder according to the present invention, and optionally a conductive agent. In a preferred embodiment, the electrode composition has the following mass composition: a. 50% to 99.95% active material, preferably 50% to 99%, b. 0% to 25% of conducting agent, preferably 0.5% to 25%, c. 0.05% to 25% of said binder according to the invention, preferably 0.5% to 25%, d.0% to 25% of at least one additive chosen from the group consisting of a plasticizer, an ionic liquid, a dispersing agent for conductive additives, and a flow aid, preferably 0% to 5%; the sum of all these percentages being 100%. The conductive agents in the electrode are composed of one or more materials that can improve conductivity. Some examples include carbon blacks such as acetylene black, Ketjen black; carbon fibers, such as a carbon nanotube, a carbon nanofiber, a vapor-growth carbon fiber; metallic powders such as SUS (steel-use stainless) powder, or aluminum powder. The active materials in the electrode compositions are materials that are capable of storing and releasing lithium ions.In particular, for a negative electrode, the active material is selected from the group consisting of a lithium alloy, lithium metal, a metal oxide, a carbon material such as graphite or hard carbon, silicon and its derivatives SiOx, silicone, silicon-graphite composite, a silicon alloy and Li4Ti5O12, or a mixture thereof. The form of the active material for the negative electrode is not particularly restricted but is preferably particulate. In particular, for a positive electrode, the active material is selected from the group consisting of LiCoO2, Li(Ni, Co, Al)O2, and Li. (1+ x) Neither a Mn b Co c(x represents a real number of 0 or more, a = 0.9, 0.8, 0.6, 0.5, or 1 / 3, b = 0.05, 0.1, 0.2, 0.3, or 1 / 3, c = 0.05, 0.1, 0.2, or 1 / 3), LiNiO2, LiMn2O4, LiCoMnO4, Li3NiMn3O3, Li3Fe2(PO4)3, Li3V2(PO4)3, a LiMn spinel substituted by a different element having a composition represented by Li1+xMn2-x-yMyO4, M representing at least one metal chosen from Al, Mg, Co, Fe, Ni, and Zn, x and y independently representing a real number between 0 and 2, lithium titanate LixTiOy – x and y independently representing a real number between 0 and 2, and a Lithium metal phosphate with a composition represented by LiMPO4, where M represents Fe, Mn, Co, or Ni. The shape of the active material for the positive electrode is not particularly limited but is preferably particulate. Furthermore, the surface of each of the materials described above can be coated.The coating material is not particularly limited as long as it possesses lithium ion conductivity and contains a material capable of being maintained as a coating layer on the surface of the active material. Examples of coating materials include LiNbO3, Li4Ti5O12, and Li3PO4. This electrode composition can be deposited on at least one face of a current collector to form the electrode. This deposition can be carried out in the presence of an organic solvent, water, a mixture of the two, or by a solvent-free process, i.e., by a dry coated electrode production process.Said organic solvent may be selected from the group consisting of n-methylpyrrolidone (NMP), dimethylsulfoxide (DMSO), N,N-dimethylformamide (DMF), triethylphosphite (TEP), acetone, cyclopentanone, tetrahydrofuran, methyl ethylketone (MEK), methyl isobutyl ketone (MiBK), ethyl acetate (EA), butyl acetate (BA), ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), gamma-butyrolactone and N-butylpyrrolidone; and mixtures thereof.The process for preparing the dry-coated electrode comprises the following steps: - mixing an active material in powder form, the binder according to the present invention, and optionally the conductive agent in powder form, the additive in powder form, or both, to form the electrode composition according to the present invention; - deposition of the electrode composition onto the current collector and drying it to manufacture an electrode; and - optionally, consolidation of the electrode by thermomechanical treatment. The dry-coated electrode is thus prepared according to a "solvent-free" process, that is to say, one that does not require a residual solvent evaporation step after the deposition step because all the constituents are mixed in a dry, powdered state, and the deposition is also carried out without solvent.Thermomechanical treatment refers to the application of mechanical pressure to the electrode at a given temperature. Such thermomechanical treatment can be carried out, for example, by a calendering machine with heated rollers or a plate press, which can also be heated. Solvent-free mixing processes for the various components of the electrode composition prior to deposition on the collector include, but are not limited to: stirring, air jet mixing, high-shear mixing, V-mixer mixing, screw mass mixer mixing, double cone mixing, drum mixing, conical mixing, double Z-arm mixing, fluidized bed mixing, planetary mixer mixing, fusion mixing, extrusion mixing, calendering, and grinding mixing.In one embodiment, after the powder mixing step, the electrode is manufactured by a solvent-free spraying process, by depositing the electrode composition onto the metal substrate, by a pneumatic spraying process, by electrostatic spraying, by dipping in a fluidized powder bed, by sprinkling, by electrostatic screen printing, by deposition with rotary brushes, by deposition with rotary adding rollers, or by calendering. In another embodiment, the electrode is consolidated after deposition onto the metal substrate by a solvent-free spraying process (pneumatic spraying, electrostatic spraying, dipping in a fluidized powder bed, sprinkling, electrostatic screen printing, deposition with rotary brushes, or deposition with rotary adding rollers) by a calendering process.This process involves applying pressure to the electrode using two rollers, which may be heated. The consolidation step is optional. Its implementation depends on the technique used to deposit the components onto the electrode. Thus, when the deposition step has been carried out by calendering, this consolidation step is optional because calendering allows for the simultaneous deposition and consolidation of the electrode. In one embodiment, after the powder mixing step, the electrode is manufactured by a solvent-free, two-step process. The first step consists of manufacturing a self-supporting film from the premixed formulation using a thermomechanical process such as extrusion, calendering, or thermocompression. In the second step, the self-supporting film is laminated onto the metallic substrate or current collector by a process combining temperature and pressure, such as calendering or thermocompression.In one embodiment, after the powder mixing step, the electrode is manufactured using a solvent-free process involving calendering. This process allows for the film formation and transfer of the coating onto the current collector in a single step, i.e., without a separate step for manufacturing a self-supporting film. To achieve this, the calender used has several rollers (at least three). The powder obtained after the mixing step is introduced between the first two rollers, which are usually heated and have differential rotation speeds to shear the powder. The coating formed and remaining adhered to the fastest roller is then directly laminated onto the current collector by a third roller. The resulting electrode can then be passed through another calender to adjust its porosity or thickness if necessary.According to another aspect of the present invention, a battery comprises a positive electrode, a negative electrode, and a separator. Preferably, in said battery, said positive electrode and / or said negative electrode comprises said binder according to the present invention. In particular, said battery is an all-solid-state battery. Cathode or Anode Coating or Composition: Said polymer P1 according to the present invention can also be used in an electrode composition, cathode or anode, or in a cathode or anode coating for an all-solid-state battery. Said coating can be a film or composition disposed on the surface of the cathode or anode. Said polymer P1 can also be used in an anode or cathode composition. In the latter case, said polymer P1 is an integral part of the electrode in question, unlike the coating.The coating or composition may comprise the polymer P1 as defined in this application, at least one lithium salt, and at least one conductivity additive as defined in this application. The lithium salt may be selected from the group consisting of LiCF3SO3, LiPF6, LiClO4, LiBF4, LiB(C2O4)2, LiN(SO2F)2, LiN(SO2CF3)2, LiN(SO2C2F3)2, LiN(SO2C2F5)2, LiN(SO2F)(SO2CF3), LiN(SO2F)(SO2C2F5), LiN(SO2CF3)(SO2C2F5), LiAsF6, LiBF2C2O4, LiNO3, LiPF3(CF2CF3)3, LiTDI, or a mixture thereof. Preferably, said lithium salt may be selected from the group consisting of LiCF3SO3, LiPF6, LiClO4, LiBF4, LiB(C2O4)2, LiN(SO2F)2, LiN(SO2CF3)2, LiN(SO2C2F3)2, LiN(SO2C2F5)2, LiTDI, or a mixture thereof. In particular, said lithium salt may be selected from the group consisting of LiCF3SO3, LiPF6, LiClO4, LiBF4, LiN(SO2F)2, LiN(SO2CF3)2, LiN(SO2C2F3)2, LiTDI, or a mixture thereof.Preferably, in said coating or in said composition according to the invention: - the mass ratio between said polymer P1 and said lithium salt can be from 0.5 to 80; - the mass ratio between said polymer P1 and said conductivity additive can be from 0.4 to 40; - the mass ratio between said lithium salt and said conductivity additive can be from 0.02 to 20. Said coating or said cathode or anode composition can be prepared from an ink obtained by mixing all the constituents of the coating in a solvent. The inks used to make the coatings can be produced by any type of mixer known to those skilled in the art, such as a planetary mixer, centrifugal mixer, orbital mixer, stirrer shaft, or ultra-Turrax. The different constituents of the ink are not added in a specific order.Ink production can be carried out at various temperatures, ranging from ambient temperature to the boiling point of the solvent used. The solvent used is preferably a polar solvent with a Hansen parameter greater than 2.By way of non-limiting example, one can cite in particular acetone, acetyl triethyl citrate (ATEC), γ-butyrolactone (GBL), cyclohexanone (CHO), cyclopentanone (CPO), dibutyl phthalate (DBP), dibutyl sebacate (DBS), diethyl carbonate (DEC), diethyl phthalate (DEP), dihydrolevoglucosenone (Cyrene), dimethylacetamide (DMAc), N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), 1,4-dioxane, 3-heptanone, hexamethyl phosphoramide (HMPA), 3-hexanone, methyl ethyl ketone (MEK), N-methyl-2-pyrrolidinone (NMP), 3-octanone, the 3-Pentanone, propylene carbonate (PC), tetrahydrofuran (THF), tetramethylurea (TMU), triacetin, triethyl citrate (TEC), triethyl phosphate (TEP), trimethyl phosphate (TMP), N,N'-tetrabutylsuccindiamide (TBSA), or a mixture of two or more of the aforementioned solvents. The invention also relates to an electrode for an all-solid-state lithium battery. The electrode may be an anode or a cathode.The electrode may comprise an active material, a binder, and optionally a conductive material. The active material is as defined above in this application for a positive or negative electrode. The electronically conductive material is selected from carbon blacks, graphites (natural or synthetic), carbon fibers, carbon nanotubes, metal fibers and powders, and conductive metal oxides. Preferably, it is selected from carbon blacks, graphites (natural or synthetic), carbon fibers, and carbon nanotubes.The binder used to manufacture the cathode is a polymer selected from polyolefins (e.g., polyethylene or polypropylene), fluoropolymers (PVDF) that may exhibit acidic functionalities, polyacrylic acids (PAAs), polyacrylonitril (PANs), cellulose-type polymers, polyphenylsulfone, polyethersulfone, a phenolic resin, a vinyl ester resin, an epoxy resin, or a liquid-crystal polymer. As mentioned above, the coating described above, comprising polymer P1, lithium salt, and conductivity additive, can be deposited on the electrode. In this case, the electrode can be prepared by the following steps: - providing an electrode, - depositing a coating layer according to the invention onto the electrode.This coating can be produced by any deposition method known to those skilled in the art, such as solvent coating, dip-and-shrink methods, centrifugal coating, spray coating, or calendering. Alternatively, as mentioned above, the composition comprising polymer P1, lithium salt, and conductivity additive may be part of the electrode composition comprising the active material, binder, and optionally, conductive material. Another polymer may be added to either the coating or the composition to enhance its mechanical strength. Conductivity Measurement: Conductivity is measured by electrochemical impedance spectroscopy at 25°C.A film consisting of a solid electrolyte according to the present invention is placed between two similar electrodes (made of stainless steel, for example) in a button cell assembled in an anhydrous medium, and electrochemical impedance spectroscopy is performed between 1 Hz and 7 MHz with an amplitude of 10 mV. The resistance R of the film is obtained by extrapolating (using a linear model) the quasi-linear portion of the low-frequency scattering curve of the impedance spectra. The resistance R is taken where the extrapolated curve intersects the X-axis of the Nyquist diagram. Consequently, the ionic conductivity σ is obtained using the equation σ = d / (R x A), where d is the thickness of the film and A is the area of ​​the stainless steel electrode. For each composition, the conductivity value at a given temperature is obtained by averaging at least two measurements taken on different samples.Weight-average molecular weight measurement: The weight-average molecular weight was measured on a Waters Alliance 2695-I5 instrument with two detectors: a Waters 2414 RI and a Waters 2487 Dual UV 254 nm, equipped with two PL gel 10 µm Mixed-B 300 x 7.5 mm columns. The flow rate was 1 mL / min, the eluent was BHT-stabilized THF, and the sample concentration was 1 g / L dissolved at room temperature for at least 4 hours. The injected volume was 5 µL. Calibration was performed with Easivial PS-H standards ranging from 580 to 6545000 g / mol. Examples 1 to 3 Three films composed of 5 wt% of LiFSI and 95 wt% of poly(1,8-dimercapto-3,6-dioxaoctane) (as polymer P1) each having a weight-average molecular mass Mw as mentioned in Table 1 below were prepared.To achieve this, poly(1,8-dimercapto-3,6-dioxaoctane) was dissolved in a solvent such as tetrahydrofuran, dimethyl sulfoxide, or N-methyl-2-pyrrolidone using a rollmixer in an oven at 50–60°C. The dissolution time varied from 24 hours to over 72 hours. The samples were filmed using a bar coater equipped with 250 µm or 400 µm squeegees. Several types of supports were used, such as aluminum and Mylar. The solvent was evaporated at a temperature between 50 and 60°C to form a film. The results are shown in Table 1; the compositions are based on the weight-average molecular weights (Mw). The polymer P1 / lithium salt ratio remains unchanged at 95%: 5% by weight. [Table 1] Composition Mw (g / mol) Conductivity at 25°C (mS / cm)1 539000 3.5.10-62 310000 4.6.10-63 116000 5.5.10-7 As can be seen in Table 1, the films obtained and prepared with poly(1,8-dimercapto-3,6-dioxaoctane) exhibit good conductivity even at low molar masses. Higher molar masses are preferred to achieve better conductivity. These films are therefore suitable for use in an all-solid-state battery requiring a conductivity of at least 1.10. -7The electrochemical stability of the various films 1 to 3 prepared above was evaluated by cyclic voltammetry at 25°C. This was achieved by placing the solid electrolyte (prepared by solvent extraction under a dry atmosphere) in a button cell between a stainless steel electrode and a lithium metal electrode. Cyclic voltammetry was performed between 2 and 5 V at 0.1 mV / s. The results for the three films are shown in Fig. 1. It can be observed that the solid electrolyte film has an electrochemical stability of at least 4.8 V. These electrochemical stabilities are more than sufficient for use in lithium batteries, including those with high-voltage positive active materials (such as nickel-rich NMC).

Claims

Claims 1. Use in a secondary Li-ion battery of a polymer P1 characterized in that it comprises at least one segment –(SRS)-(SRS)- with R being, independently for each unit –(SRS)-, a hydrocarbon substituent having a molecular mass less than 1000 g / mol and in that said polymer P1 is amorphous.

2. Use according to the preceding claim characterized in that said polymer P1 is used as a binder for an electrode, or is one of the components of an electrode composition, an electrode coating, a separator, or a solid electrolyte.

3. Use according to any one of the preceding claims characterized in that said polymer P1 has a molar mass greater than 50,000 g / mol measured according to the method described in this application.

4. Use according to any one of the preceding claims characterized in that said polymer P1 has a conductivity greater than 1.10 -7S / cm measured at a temperature of 25°C according to the method detailed in this application.

5. Use according to any one of the preceding claims, characterized in that, in said polymer P1, R is a hydrocarbon comprising at least one ether, ester, or carbonyl functional group.

6. Use according to any one of the preceding claims, characterized in that, in said polymer P1, R has the formula -[R1-X-]n-[Y]m- in which R 1is, independently for each unit n, selected from the group consisting of C1-C10 alkyl, C3-C10 cycloalkyl, C6-C12 aryl; X is O, C(O), C(O)O, OC(O); n is an integer from 1 to 10; Y is, independently for each unit m, selected from the group consisting of C1-C10 alkyl, C3-C10 cycloalkyl, C6-C12 aryl; m is an integer from 0 to 10.

7. Use according to any one of the preceding claims characterized in that, in said polymer P1, R is of formula -R2-O-R3-O-R4- in which R2, R3 and R4 are, independently of each other, selected from the group consisting of C1-C 10 alkyl, C3-C 10 cycloalkyl, C6-C 12aryl.

8. Use according to any one of the preceding claims characterized in that said polymer P1 is poly(1,8-dimercapto-3,6-dioxaoctane).

9. Solid electrolyte comprising a lithium salt and said polymer P1 as defined in any one of claims 1 or 3 to 8.

10. Solid electrolyte according to the preceding claim, characterized in that said lithium salt is selected from the group consisting of LiCF3SO3, LiPF6, LiClO4, LiBF4, LiB(C2O4)2, LiN(SO2F)2, LiN(SO2CF3)2, LiN(SO2C2F3)2, LiN(SO2C2F5)2, LiN(SO2F)(SO2CF3), LiN(SO2F)(SO2C2F5), LiN(SO2CF3)(SO2C2F5), LiAsF6, LiBF2C2O4, LiNO3, LiPF3(CF2CF3)3, LiTDI, or a mixture thereof.

11. Film comprising, preferably consisting of, said solid electrolyte according to any one of the preceding claims 9 to 10.

12. All-solid battery comprising a cathode, an anode, and a separator comprising said film according to the preceding claim. 13.Separator comprising said polymer P1 as defined in any one of claims 1 or 3 to 8.

14. Binder comprising said polymer P1 as defined in any one of claims 1 or 3 to 8.

15. Electrode comprising an active material, a binder according to the preceding claim, and optionally a conductive material.

16. Electrode according to the preceding claim characterized in that said active material is selected from the group consisting of: - an active material for the cathode selected from the group consisting of LiCoO2, Li(Ni, Co, Al)O2, Li (1+ x) Neither a Mn b Co c(x represents a real number of 0 or more, a = 0.8, 0.6, 0.5, or 1 / 3, b = 0.1, 0.2, 0.3, or 1 / 3, c = 0.1, 0.2, or 1 / 3), LiNiO2, LiMn2O4, LiCoMnO4, Li3NiMn3O3, Li3Fe2(PO4)3, Li3V2(PO4)3, a LiMn spinel substituted with a different element having a composition represented by Li1+xMn2-x-yMyO4, M representing at least one metal chosen from Al, Mg, Co, Fe, Ni, and Zn, x and y independently representing a real number between 0 and 2, lithium titanate LixTiOy where x and y independently representing a real number between 0 and 2, and a lithium metal phosphate having a composition represented by LiMPO4, M representing Fe, Mn, Co, or Ni; - an active anode material selected from the group consisting of lithium alloy, lithium metal, a metal oxide, a carbon material such as graphite or hard carbon, silicon and its derivatives SiOx, silicone, graphite-silicon composite, a silicon alloy and Li4Ti5O12 or a mixture thereof.

17. Electrode coating consisting of said polymer P1 as defined in any one of claims 1, 3 to 8, a lithium salt and a conductivity additive.

18. Electrode composition comprising said polymer P1 as defined in any one of claims 1, 3 to 8.

19. Battery comprising an electrode according to any one of claims 15 or 16.