Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
  • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
  • H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F293/00—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule
  • C08F293/005—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/20—Manufacture of shaped structures of ion-exchange resins
  • C08J5/22—Films, membranes or diaphragms
  • C08J5/2206—Films, membranes or diaphragms based on organic and/or inorganic macromolecular compounds
  • C08J5/2218—Synthetic macromolecular compounds
  • C08J5/2231—Synthetic macromolecular compounds based on macromolecular compounds obtained by reactions involving unsaturated carbon-to-carbon bonds
  • C08J5/2243—Synthetic macromolecular compounds based on macromolecular compounds obtained by reactions involving unsaturated carbon-to-carbon bonds obtained by introduction of active groups capable of ion-exchange into compounds of the type C08J5/2231
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/052—Li-accumulators
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
  • H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
  • H01M10/0562—Solid materials
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/36—Selection of substances as active materials, active masses, active liquids
  • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
  • H01M4/381—Alkaline or alkaline earth metals elements
  • H01M4/382—Lithium
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/36—Selection of substances as active materials, active masses, active liquids
  • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
  • H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F2438/00—Living radical polymerisation
  • C08F2438/02—Stable Free Radical Polymerisation [SFRP]; Nitroxide Mediated Polymerisation [NMP] for, e.g. using 2,2,6,6-tetramethylpiperidine-1-oxyl [TEMPO]
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2353/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
  • C08J2353/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2387/00—Characterised by the use of unspecified macromolecular compounds, obtained otherwise than by polymerisation reactions only involving unsaturated carbon-to-carbon bonds
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M2300/00—Electrolytes
  • H01M2300/0017—Non-aqueous electrolytes
  • H01M2300/0065—Solid electrolytes
  • H01M2300/0082—Organic polymers
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/10—Energy storage using batteries

Definitions

• the present invention relates to a block copolymer of the BA or BAB type, A being an ethylene oxide block or derivative block and B an anionic polymer block based on lithium bis (trifluoromethylsulfonyl) imide, a process for its preparation, and that its uses, in particular for the preparation of an electrolyte composition for batteries Lithium Metal Polymer (LMP).
• A being an ethylene oxide block or derivative block
• B an anionic polymer block based on lithium bis (trifluoromethylsulfonyl) imide
• This type of battery is in the form of an assembly of coiled thin films (winding of the following pattern ⁇ electrolyte / cathode / collector / cathode / electrolyte / lithium ⁇ on n turns or n thin films stacked (cut and superimposed, ie n
• This stacked / complexed unitary pattern has a thickness of the order of one hundred micrometers 4 functional sheets are included in its composition: i) a negative electrode (anode) generally consisting of a lithium sheet metal or a lithium alloy, ii) an electrolyte composed of a polymer (usually based on poly (ethylene oxide) (POE)) and lithium salts, iii) a positive electrode (cathode) composed of an electrode active material whose working potential is less than 4V vs Li + / Li, for example based on metal oxide or based on LiMPO 4 type phosphate where M represents a metal
• the polymers used in the composition of the electrolytes must combine good properties of ionic conductivity and good mechanical properties of elasticity and plasticity in order to be used satisfactorily in the LMP batteries.
• Solid polymer electrolytes have many advantages, namely high thermal stability, improved safety, Battery thin, flexible and varied shapes, the low cost of the material and its implementation.
• solid electrolyte polymers make it possible to use lithium metal as anode with higher energy densities than lithium ion anodes.
• Polymeric electrolytes are also very interesting because of their low reactivity towards lithium metal and their potential to block the growth of dendrites.
• the growth of polymer electrolytes has been restrained by the inability to develop an electrolyte that has both high ionic conductivity and good mechanical strength. These difficulties lie in the fact that the high conductivity requires a high mobility of the polymer chains which has the opposite effect of producing polymers of low mechanical strength.
• ethylene oxide (EO) polymers have already been proposed in the literature. It has been widely known, since the late 1970s, to use ethylene oxide (EO) polymers, however, it is found that they do not exhibit sufficient conductivity at room temperature.
• EO ethylene oxide
• POE lithium salt-doped poly
• the crystal structure restricts the mobility of the chains and decreases the ionic conductivity of the polymer. Above the POE melting temperature (T f ⁇ 60-65 ° C), the ionic conductivity increases considerably, but at these temperatures the POE becomes a viscous liquid and loses its dimensional stability.
• the POE block copolymers used in the solid polymeric electrolytes may be diblock copolymers A-B or triblock copolymers A-B-A.
• diblock copolymers in which the first block is a poly (alkyl methacrylate), especially poly (methacrylate).
• lauryl) PLMA
• PnMBA poly (n-butyl methacrylate)
• PMMA poly (methyl methacrylate)
• PMAPEG poly Ethylene Oxide
• the PLMA-b-PMAPEG copolymer doped with LiCF 3 SO 3 has a conductivity of the order of 8 ⁇ 10 -6 S / cm at room temperature, which is insufficient.
• Niitani et al. Electrochemical Solid-State Letters, 2005, 8 (8), 1385-A388, J. Power Resources, 2005, 146, 386-390 and EP 1 553 1 17
• a triblock polymer composed of PMAPEG (23 units).
• 'OE polystyrene
• PS polystyrene
• This ionic conductivity is correct but it corresponds to a liquid
• the number of lithium ion transport is low, resulting in poor power handling and a significant drop in capacity beyond C / 10.
• a solid polymer electrolyte including a micro-phase separation block copolymer comprising an ion conductive block, a second immiscible block with the ionic conductive block, an anion immobilized on the polymer electrolyte, and a cationic species (Li + ) ensuring polymer neutrality and ion mobility.
• a cationic species Li +
• Pennon is preferably immobilized on the second block which induces a phase micro-phase separation of the cations and anions of the polymer electrolyte in order to improve the number of lithium ions (t + ) to a value greater than 0.5.
• the ionic conductive block may especially consist of polyethylene oxide (PEO), polyethylene glycol (PEG), polypropylene oxide (PPO) or polypropylene glycol (PPG).
• the number-average molecular weight of the ionic conductive block is greater than 50 kg / mol, and particularly preferably greater than 200000 kg / mol.
• the second block is immiscible with the first block and may consist of an ionic nonconductive block such as a polyalkylacrylate methacrylate type, a polydimethylsiloxane, a polybutadiene, a polyisoprene, polystyrenes modified with flexible side chains alkylfluorocarbon or siloxane attached to phenyl groups, etc.
• the anion is preferably bound to the polymer by a covalent bond and may be selected from carboxylates, sulfonates and phosphates. These polymers can be used in any type of battery and have operating temperatures ranging from 20 to 100 ° C.
• the polymer is a polystyrene bearing sulfonyl (trifluoromethylsulfonyl) imide groups (PSTFSI (a)), it is obtained by radical polymerization from sodium 4-styrene-sulfonyl (trifluoromethylsulfonyl) imide monomers. This polymer is then used in simple mixing with POE to produce an electrolyte membrane containing no additional lithium ions.
• PSTFSI (a) polystyrene bearing sulfonyl (trifluoromethylsulfonyl) imide groups
• membranes Prepared with PSTFSI obtained by chemical modification of sodium polystyrene sulfonate (PSTFSI (b)) in admixture with POE, as well as lithium poly (styrene sulfonate) (PSSO 3 L1) mixed with POE are also tested. for their ionic conductivity.
• the results obtained show a conductivity equivalent to 70 ° C between the membranes consisting of the mixture PSTFSI (b) / POE and the mixture PSSO 3 L1 / POE while that obtained with the membrane PSTFSI (a) / POE is 10 times higher ( of the order of 9.5x ⁇ 0 6 S cm 1 ).
• the number of lithium ion transport is however not indicated.
• the subject of the present invention is a diblock copolymer of type BA or triblock of type BAB, characterized in that:
• block A is an unsubstituted polyoxyethylene chain having a number average molecular weight less than or equal to 100 kDa;
• Block B is an anionic polymer capable of being prepared from one or more monomers selected from vinyl monomers and derivatives, said monomers being substituted by a sulfonyl anion (trifluoromethylsulfonyl) imide (TFSI) of the following formula:
• * represents the point of attachment of said anion of formula (I) to said monomer via a covalent bond or a linear alkyl chain having from 1 to 5 carbon atoms.
• the flag of formula (I) is attached to the chain constituting block B, either directly via a covalent bond or via an alkyl chain.
• the only mobile ion after dissociation of the copolymer is the Li + cation, which gives it specific properties (very good conductivity, Li + cation transport number (t + ) close to 1) while also having good mechanical strength.
• the block A preferably comprises from 225 to 2250 ethylene oxide units, and even more preferentially from 500 to 1150 ethylene oxide units.
• a most preferred value is 795 ethylene oxide units.
• the molecular weight of block A is always less than 100 kDa and preferably varies from 10 to 50 kDa.
• Block B may furthermore result from the copolymerization of at least one vinyl monomer as defined above and from at least one monomer chosen from styrene, a poly (ethylene glycol) acrylate (APEG) and a diene acrylate.
• the copolymer is chosen from:
• MMATFSILi-stat-APEG P-type (MMATFSILi-stat-APEG) -b-PEO-b-P (MMATFSILi-stat-APEG) triblock copolymers in which the B blocks are random copolymers of TFSILi methacrylate and polyethylene glycol acrylate for which the ratio P (MMATFSILi-stat-APEG) / POE varies from 10 to 40% by mass approximately.
• Particularly preferred copolymers according to the present invention are the copolymers P (STFSILi) -b-POE-bP (STFSILi), in which each of the blocks PSTFSILi has a number average molecular weight ranging from 2000 to 7500 g / mol and the central block POE a number average molecular weight of 35000 g / mol.
• a still more particularly preferred copolymer according to the present invention is the copolymer P (STFSILi) -b-POE-bP (STFSILi), in which each of the blocks PSTFSILi has a number-average molecular weight of about 4900 g / mol and the block POE core has a number average molecular weight of 35000 g / mol, the POE block representing 78% by weight of the total weight of the copolymer.
• copolymer P MMATFSILi-stat-APEG
• block POE MMATFSILi-stat-APEG
• the blocks B are random copolymers of methacrylate of TFSILi and of acrylate of polyethylene glycol in which each of the P blocks (MMATFSILi-stat-APEG) has a number average molecular weight of about 7500 g / mol and the POE central block has a number average molecular weight of 35000 g / mol, the block POE representing 70% by weight of the total weight of the copolymer.
• copolymers in accordance with the invention may be prepared by any controlled polymerization method (Atom Transfer Radical Polymerization (ATP), anionic, cationic, NMP ("Nitroxide-Mediated Radical”), RAFT ("reversible addition fragmentation chain transfe”). Polymerization ”)),
• the synthesis when the synthesis is carried out according to the NMP method, it consists in synthesizing at first a POE-based macroalkoxyamine and then in copolymerizing said macroalkoxyamine and the vinyl monomers carrying an anion of formula ( ⁇ ), then ion exchange to replace the cation K + with a cation Li + .
• the synthesis of macroalkoxyamines based on POE can be carried out according to the method described in the international application WO 2007/1 13236.
• the synthesis of the vinyl monomers bearing a ring of formula (I) can for example be carried out according to the method described by. Meziane et al. (Ibid).
• the first step is preferably carried out in a polar solvent such as for example ⁇ , ⁇ -dimethylformamide (DMF), dimethylsulfoxide (DMSO), water at a temperature ranging from 80 to 120 ° C, for a period of 2 to 20 hours. .
• a polar solvent such as for example ⁇ , ⁇ -dimethylformamide (DMF), dimethylsulfoxide (DMSO), water at a temperature ranging from 80 to 120 ° C, for a period of 2 to 20 hours.
• the exchange of the cations of step ii) can for example be carried out using a dialysis membrane, using a lithium salt such as for example lithium chloride.
• step ii) the resulting copolymer according to the invention is then preferably washed to remove the excess lithium salt and optionally the excess vinyl monomer which has not polymerized, then the solution is preferably evaporated under vacuum to allow storage of the copolymer.
• the tests carried out show that the use of the copolymers according to the present invention as solid polymer electrolyte in a lithium metal battery leads to an energy storage device having excellent performance at low temperature (approximately 60 ° C.). C), in particular a lithium ion transport number greater than 0.84, and an ionic conductivity of 10 -5 cm -1 at 60 ° C.
• the copolymers according to the present invention when used as solid polymer electrolyte, also have good mechanical strength, high thermal stability (which ensures the safety of the energy storage devices comprising them), and potential stability. improved.
• the high transport number makes it possible to limit the formation of a concentration gradient in the electrolyte during the discharge (respectively of the charge) making it possible to increase the power performances (respectively the speed of the charge).
• the use of these copolymers as a solid polymer electrolyte in a lithium metal battery also makes it possible to limit the dendritic growth of lithium and thus to envisage fast and safe refills. Indeed, the problem of lithium metal battery technology is the formation of heterogeneous lithium electrodeposits (including dendrites) during recharging. which reduces cyclability and can lead to short circuits.
• These polymers are moreover stable up to 4.5 V vs Li + / Li.
• the subject of the invention is also the use of at least one diblock copolymer of type BA or triblock of type BAB as defined above, as solid electrolyte in a lithium battery, and in particular in a lithium metal battery.
• Another object of the invention is a solid polymer electrolyte, characterized in that it comprises at least one diblock copolymer of type BA or tri block type BAB as defined above.
• the solid polymer electrolyte according to the invention may further comprise a plasticizer such as a carbonate or a mixture of carbonates chosen from propylene carbonate, ethylene carbonate and dimethyl carbonate, succinonitrile, tetraethylsulfonamide, etc.
• a plasticizer such as a carbonate or a mixture of carbonates chosen from propylene carbonate, ethylene carbonate and dimethyl carbonate, succinonitrile, tetraethylsulfonamide, etc.
• the solid polymer electrolyte according to the present invention may in particular be in any suitable form, for example in the form of a sheet, a film or a membrane.
• the solid polymer electrolyte according to the invention may be prepared by any technique known to those skilled in the art such as for example by coating or extrusion.
• the subject of the invention is also a cell of a rechargeable lithium battery comprising a lithium metal anode and a cathode comprising at least one positive electrode active compound chosen from compounds containing lithium ions, between which is located a solid polymer electrolyte, characterized in that said solid polymer electrolyte is as defined above.
• the ideal operating temperature of such a cell is about 60 to 100 ° C.
• the active electrode active material is preferably chosen from lithium phosphates, and in particular LiFePO 4 , Li 3 V 2 (PO 4 ) 3, LiCoPO 4 , LiMnPO 4 , LiNiPO 4 ; lithium oxides such as for example LiCoO 2 and LiMn 2 O 4 and mixtures thereof. Among these compounds, LiFePO 4 is very particularly preferred.
• the grammage of the cathode ie the amount of positive electrode active material / cm 2 / face
• the grammage of the cathode is greater than 0.6 mAh / cm 2 , preferably it varies from 0.6 to 2.5 mAh / cm 2 .
• the positive electrode may also comprise an agent generating an electrical conductivity such as a carbonaceous material such as, for example, carbon black, carbon fibers, carbon nanotubes and mixtures thereof.
• an agent generating an electrical conductivity such as a carbonaceous material such as, for example, carbon black, carbon fibers, carbon nanotubes and mixtures thereof.
• the positive electrode may also further comprise at least one copolymer according to the invention and as defined above, which makes it possible to prevent the formation of a concentration gradient in the thickness of the cathode during cycling and thus to improve the power performance of the battery or to increase the grammage of the cathode.
• the anionic solid copolymer according to the present invention preferably represents from 25 to 45% by weight relative to the total mass of the cathode.
• the mass proportions of the positive electrode are as follows: positive electrode active material / solid polymer electrolyte / carbon: 60/32/8.
• the present invention is illustrated by the following exemplary embodiments, to which it is however not limited.
• Macroalkoxyamine SG1-MAMA-POE-MAMA-SG1 (or PEO-diSG1) of the following formula was synthesized:
• the expected block copolymer was obtained in which each of the blocks PSTFSILi had a number average molecular weight of 7300 g / mol (estimated from 30.8% by mass measured by MN) and the central POE block an average molecular weight. in number of 35000 g / mol, the PSTFSILi block representing 30.8% by weight of the total weight of the copolymer.
• the expected block copolymer was obtained in which each of the PSTFSILi blocks had a number average molecular weight of 4800 g / mol (estimated from 21.4% by mass measured by MN) and the central POE block an average molecular weight. in number of 35000 g / mol, the PSTFSILi block representing 21.4% by weight of the total weight of the copolymer.
• This product was synthesized according to the same protocol as potassium 4-styrenesulfonyl (trifluoromethylsulfonyl) imide (STFSIK) using the potassium salt of 3-sulfopropyl methacrylic acid instead of the sodium salt of styrene sulfonic acid.
• STFSIK potassium 4-styrenesulfonyl (trifluoromethylsulfonyl) imide
• the polymerization reaction was stopped by immersing the flask in an ice bath.
• the reaction mixture obtained was diluted in 30 ml of deionized water and placed in a dialysis membrane sold under the trade name Cellu-Sep® T2 by the company Orange Scientific, having a retention level. (MWCO) of 6,000-8,000 Da and dialyzed with 4 times 1 liter of lithium chloride solution (0.25 mol / L), in order to carry out K + cation exchange with Li + cations (0.25 mol / L), then 4 times 1 liter of deionized water to remove excess lithium chloride.
• the dialysis step also eliminated the remaining monomer.
• the copolymer solution was then evaporated under vacuum.
• the expected block copolymer was obtained in which each of the P blocks (MMATFSILi-stat-APEG) had a number-average molecular weight of 1700 g / mol (estimated from 9% by mass measured by MN) and the central block of POE a number average molecular weight of 35000 g / mol, the P block (MMASTFSILi-stat-APEG) representing 9% by weight of the total copolymer mass (7% of MMATFSILi and 2% of APEG).
• P (MMATFSILi-stat-APEG) -b-PEO-b-P (MMATFSILi-stat-APEG) polymers at 20 and 30% by weight of P (MMASTFSILi-stat-APEG) respectively were also prepared according to the same process. using different proportions of raw material.
• the fusion of the POE crystallites in the various copolymers prepared above in Example 1 was studied by Differential Scanning Calorimetry (DSC) using an apparatus sold under the reference DSC. 2920 by Thermal Analysis using an aluminum nacelle, in the temperature range -70 ° C to 80 ° C with a heating rate of 5 ° C / min, (nitrogen flow rate: 10 mL / min) .
• DSC Differential Scanning Calorimetry
• thermograms obtained are shown in the appended FIG. 1, in which the heat flux (in W / g) is a function of the temperature.
• the dashed line corresponds to the 9.5% by weight copolymer of PSTFSILi
• the continuous line curve to the copolymer to 21.2% by weight of PSTFSILi the distance curve drawn to the copolymer at 30.8%. by weight of PSTFSILi and the curve and dashes and dots alternating with the copolymer at 42.9% by weight of PSTFSILi.
• Table 1 The data are summarized in Table 1 below:
• T f is the melting temperature
• ⁇ triblock is the melting enthalpy of the triblock copolymer
• ⁇ POE is the melting enthalpy of the POE block only
• Tg is the glass transition temperature of the POE.
• the electrochemical stability of these copolymers was studied by cyclic voltammetry using cells consisting of a lithium metal anode, a copolymer as prepared in Example 1 as a solid electrolyte and a platinum sheet. as cathode. The measurements were made at 80 ° C between 1.5 and 5.5 V (vs. Li + / Li) at a scanning rate of 1 mVs -1 .
• FIG. 4 shows the capacity (in mAh / g) restored as a function of the number of cycles of the tested battery. The different regimes are shown in the figure as well as the test temperatures.
• the battery thus prepared has a comparable cyclability at 60, 70 and 80 ° C which is a performance compared to the results of the literature on dry polymers.
• the battery thus prepared has a comparable cyclability at 60, 70 and 80 ° C which is a performance compared to the results of the literature on dry polymers.
• it is the same prototype battery that has worked in different thermal conditions, which is a drastic treatment because the tests are usually performed in isothermal conditions, except in the case of an accelerated aging simulation.
• FIG. 5 The power handling of the battery is given by the appended FIG. 5 in which the capacity restored (in mAh / g) is a function of the logarithm of the current density (pseudo-Ragone curve).
• the curve whose points are solid squares corresponds to the operation at 80 ° C.
• the curve whose points are empty triangles corresponds to the operation at 70 ° C.
• the curve whose points are solid diamonds corresponds to the operating at 60 ° C.

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