Aliphatic polysulfone, synthesis method, application, and aliphatic polysulfone-based solid electrolyte

Abstract

The present invention relates to an aliphatic polysulfone and a synthesis method, application, and aliphatic polysulfone-based solid electrolyte. The synthesis method of the aliphatic polysulfone is to obtain a polysulfide by a thiol-ene click reaction using dithiol and diene monomers, and then add an oxidant to cause the polysulfide to undergo an oxidation reaction to generate an aliphatic polysulfone; wherein the oxidant is a potassium peroxysulfate complex salt. The present invention is based on thiol-olefin click chemistry, synthesizes polysulfide under the catalysis of an organic base, and then uses oxone as an oxidant to prepare an aliphatic polysulfone. The method is simple in steps, pollution-free, and low in cost, and is conducive to promotion. The aliphatic polysulfone can prepare a polymer solid electrolyte and is used in secondary batteries such as high-voltage lithium ion batteries and lithium metal batteries. The aliphatic polysulfone-based solid electrolyte has good electrochemical stability and excellent high-voltage resistance in a voltage range of 0-5V.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer solid electrolytes, and in particular to an aliphatic polysulfone and a synthesis method, application, and an aliphatic polysulfone-based solid electrolyte. Background Art

[0002] The continuous shortage of fossil resources and the increasing environmental pollution have made green, efficient and clean new electrochemical energy storage devices more and more valued. As an important secondary battery, lithium-ion batteries have many advantages such as low cost, good rate performance, high energy density, long cycle life, low self-discharge, no memory effect and no pollution to the environment. They are widely used in lightweight portable electronic devices such as laptops, mobile phones, cameras, and large equipment such as electric vehicles, underwater robots, and submarines.

[0003] The main safety issue of lithium-ion batteries lies in the fact that traditional lithium-ion batteries use flammable, volatile, and leaky carbonates as solvents for lithium salt electrolytes, which are prone to combustion and explosion in the event of abnormal use, impact, overcharge, over-discharge, puncture, etc.

[0004] The use of solid polymer electrolytes is one of the most effective measures to solve the safety problem of lithium-ion batteries. The polymer matrices used in the prior art mainly include polyethylene glycol, polymethyl methacrylate, polysulfide, polycarbonate, etc. In these solid-state lithium-ion batteries, lithium iron phosphate is used as the positive electrode, and its voltage is not high, which limits the specific energy density of the battery. Therefore, it is particularly necessary to develop polymer solid electrolytes for high-voltage positive electrode materials, such as lithium cobalt oxide (4.45V) or lithium nickel manganese oxide (4.8V).

[0005] Compared with ether bonds, thioether bonds, etc., the sulfone groups contained in aliphatic polysulfones have greater polarity, higher redox potential, and a wide electrochemical stability window. They are expected to have excellent high-voltage resistance and are an ideal polymer matrix material for high-voltage solid electrolytes.

[0006] However, the current preparation methods of aliphatic polysulfones are mostly to directly oxidize the corresponding polysulfide. In this reaction, the polysulfide is dissolved in an organic solvent and meta-chloroperbenzoic acid is used as an oxidant. Due to the low oxidation efficiency, a large amount of excessive organic peroxy acid and organic solvent are required. Moreover, in the preparation process, this oxidant has high requirements on equipment, harsh reaction conditions, and a large amount of organic solvent is used in the oxidation process, which makes the production cost high and causes serious pollution to the environment. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide an aliphatic polysulfone and a synthesis method, application and an aliphatic polysulfone-based solid electrolyte.

[0008] The technical solution of the present invention to solve the above technical problems is as follows:

[0009] The invention provides a method for synthesizing aliphatic polysulfone, which comprises adopting dithiol and diene monomers to obtain polysulfide through thiol-ene click reaction, and then adding an oxidant to cause the polysulfide to undergo oxidation reaction to generate aliphatic polysulfone; wherein the oxidant is potassium peroxosulfate composite salt.

[0010] Furthermore, the process of the thiol-ene click reaction is to uniformly mix dithiol and diene monomers of equal molar mass under ice bath conditions, add an initiator to react the two to obtain a transparent colloidal polysulfide;

[0011] The oxidation reaction process is to add an organic solvent to dissolve the transparent colloidal polysulfide, add the potassium peroxydisulfate complex salt and a sufficient amount of deionized water, and react under heating conditions to generate an insoluble substance, wherein the insoluble substance is an aliphatic polysulfone;

[0012] The heating condition has a temperature of 40°C to 80°C and a heating time of 6 to 24 hours;

[0013] The molar ratio of the potassium persulfate complex salt to the dithiol is (2-5):1.

[0014] Furthermore, the dithiol is a mixture of one or more of 3,6-dioxa-1,8-octanedithiol and 1,2-ethanedithiol.

[0015] Furthermore, the diene monomer is a mixture of one or more of ethylene glycol diacrylate, ethylene glycol dimethacrylate, diethylene glycol diacrylate, and diethylene glycol dimethacrylate.

[0016] Furthermore, the initiator is one of n-hexylamine, triethylamine, triphenylphosphine, trimethylphosphine and trimethoxyphosphine.

[0017] Furthermore, the organic solvent is one of tetrahydrofuran, acetonitrile, dimethyl sulfoxide, N,N-dimethylformamide, N,N-dimethylacetamide, and N-methylpyrrolidone.

[0018] Furthermore, the method further comprises a purification step: separating insoluble matter in the system after the reaction, washing the insoluble matter with deionized water and drying the insoluble matter to obtain dry aliphatic polysulfone.

[0019] The present invention provides an aliphatic polysulfone prepared by the above-mentioned synthesis method of aliphatic polysulfone, and its structural formula is shown in formula (I):

[0020]

[0021] Among them, R is represented by

[0022] R` is represented by

[0023] R`` represents H or -CH3;

[0024] The molecular weight of the aliphatic polysulfone is 5,000-1,000,000.

[0025] The present invention provides the use of the above-mentioned aliphatic polysulfone in the preparation of aliphatic polysulfone-based solid electrolyte.

[0026] The present invention provides an aliphatic polysulfone-based solid electrolyte, comprising the above-mentioned aliphatic polysulfone and a lithium salt, wherein the lithium salt accounts for 5-80% of the total mass of the aliphatic polysulfone-based solid electrolyte; the lithium salt is one or more of lithium hexafluorophosphate, lithium bistrifluoromethanesulfonyl imide, lithium difluorooxalatoborate, lithium perchlorate, and lithium bisoxalatoborate.

[0027] The beneficial effects of the present invention are:

[0028] (1) The method for synthesizing aliphatic polysulfone of the present invention is based on thiol-olefin click chemistry, uses dithiol and diene monomers as raw materials, and uses potassium peroxydisulfate complex salt (oxone) as an oxidant. It can complete the preparation of aliphatic polysulfone in the same system, and has the advantages of simple process and low cost.

[0029] (2) The aliphatic polysulfone synthesis method of the present invention uses deionized water to dissolve the oxidant oxone, which greatly reduces the amount of organic solvent used in the reaction process, not only further reducing the synthesis cost, but also effectively reducing the pollution of the environment by the waste after the reaction, making the method environmentally friendly.

[0030] (3) The aliphatic polysulfone of the present invention has greater polarity and higher redox potential, a wide electrochemical stability window, and excellent high voltage resistance, and can be used to prepare polymer solid electrolytes.

[0031] (4) The aliphatic polysulfone-based solid electrolyte of the present invention uses the polysulfone provided by the present invention as a matrix, and the solid electrolyte has good electrochemical stability and excellent high-voltage resistance in the voltage range of 0-5V. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is the hydrogen nuclear magnetic resonance spectrum of P(EGDMA-DODT) polysulfide prepared in Example 1 in the synthesis method of aliphatic polysulfone of the present invention;

[0033] Figure 2The hydrogen nuclear magnetic resonance spectrum of the PSF (EGDMA-DODT) polysulfone prepared in Example 1 in the synthesis method of the aliphatic polysulfone of the present invention;

[0034] Figure 3 is the hydrogen nuclear magnetic resonance spectrum of P(EGDMA-EDT) polysulfide prepared in Example 4 in the synthesis method of aliphatic polysulfone of the present invention;

[0035] Figure 4 is the hydrogen nuclear magnetic resonance spectrum of the PSF (EGDMA-EDT) polysulfone prepared in Example 4 in the synthesis method of the aliphatic polysulfone of the present invention;

[0036] Figure 5 The AC impedance diagram of the PSF (EGDMA-DODT) polysulfone-based electrolyte prepared in Example 9 at room temperature in the synthesis method of the aliphatic polysulfone of the present invention;

[0037] Figure 6 This is the linear sweep voltammogram at room temperature of the PSF (EGDMA-DODT) polysulfone-based electrolyte prepared in Example 9 in the synthesis method of the aliphatic polysulfone of the present invention. DETAILED DESCRIPTION

[0038] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0039] The synthesis method of aliphatic polysulfone of the present invention adopts dithiol and diene monomers to obtain polysulfide through thiol-ene click reaction, and then adds oxidant to make polysulfide undergo oxidation reaction to generate aliphatic polysulfone; wherein the oxidant is potassium peroxysulfate complex salt (oxone).

[0040] The synthesis method of the aliphatic polysulfone of the present invention is based on thiol-olefin click chemistry, uses dithiol and diene monomers as raw materials, uses potassium peroxydisulfate complex salt (oxone) as an oxidant, and completes the preparation of the aliphatic polysulfone in the same system, and has the advantages of simple process, low cost and the like.

[0041] Click chemistry is a series of simple, efficient, convenient and controllable chemical reactions. The thiol-ene reaction is an important type of reaction within the scope of click chemistry, and its principle is a reaction that occurs under the catalysis of an initiator.

[0042] Preferably, the process of the thiol-ene click reaction is, under ice bath conditions, adding dithiol and diene monomers of equal molar mass into a reaction container and mixing them evenly, then adding an organic base as an initiator into the container, allowing the two to react to obtain a transparent colloidal polysulfide; the process of the oxidation reaction is, adding an organic solvent to dissolve the transparent colloidal polysulfide, adding potassium peroxysulfate complex salt and a sufficient amount of deionized water, reacting under heating conditions to generate an insoluble substance, the insoluble substance is an aliphatic polysulfone; the heating conditions are at a temperature of 40°C-80°C, and the heating time is 6-24 hours; the molar ratio of oxone to dithiol is (2-5):1.

[0043] In the above specific reaction process of the present invention, deionized water is used to dissolve the oxidant oxone, which reduces the use of organic solvents, reduces pollution in the preparation process, and is environmentally friendly.

[0044] Preferably, in the above specific reaction process, the ice bath time is 5 hours.

[0045] Preferably, after obtaining the insoluble aliphatic polysulfone, it is washed with deionized water and dried to obtain dry aliphatic polysulfone; thus, the dry aliphatic polysulfone can be used as a raw material to prepare a solid electrolyte.

[0046] More preferably, the specific drying method is vacuum drying at a temperature of 80° C. for 12 hours.

[0047] Preferably, the dithiol is a mixture of one or more of 3,6-dioxa-1,8-octanedithiol (DODT) and 1,2-ethanedithiol (EDT).

[0048] Preferably, the diene monomer is a mixture of one or more of ethylene glycol diacrylate (EDA), ethylene glycol dimethacrylate (EGDMA), diethylene glycol diacrylate (DEGDA), and diethylene glycol dimethacrylate (DEGDMA).

[0049] Preferably, the initiator is one of n-hexylamine, triethylamine, triphenylphosphine, trimethylphosphine and trimethoxyphosphine.

[0050] Preferably, the organic solvent is one of tetrahydrofuran, acetonitrile, dimethyl sulfoxide, N,N-dimethylformamide, N,N-dimethylacetamide, and N-methylpyrrolidone.

[0051] The structural formula of the aliphatic polysulfone of the present invention is shown in formula (I):

[0052]

[0053] Among them, R is represented by (-CH2-CH2-) or (-CH2-CH2-O-CH2-CH2-O-CH2-CH2-);

[0054] R` is represented by (-CH2-CH2-) or (-CH2-CH2-O-CH2-CH2-);

[0055] R`` represents H or -CH3;

[0056] The molecular weight of aliphatic polysulfone is 5000-1000000.

[0057] Preferably, the aliphatic polysulfone of the present invention is PSF (EGDMA-DODT) polysulfone, PSF (DEGDMA-DODT) polysulfone, PSF (EDA-DODT) polysulfone, PSF (EGDMA-EDT) polysulfone, PSF (DEGDMA-EDT) polysulfone, PSF (EDA-EDT) polysulfone, PSF (EGDMA-EDA-DODT) polysulfone, PSF (DEGDMA-EDT-DODT) polysulfone.

[0058] The aliphatic polysulfone of the invention can be used in preparing polymer solid electrolyte.

[0059] The aliphatic polysulfone-based solid electrolyte of the present invention comprises the above-mentioned aliphatic polysulfone and a lithium salt, wherein the lithium salt accounts for 5-80% of the total mass of the aliphatic polysulfone-based solid electrolyte; the lithium salt is one or more of lithium hexafluorophosphate (LiPF6), lithium bistrifluoromethanesulfonyl imide (LiTFSI), lithium difluorooxalatoborate (LiDFOB), lithium perchlorate (LiClO4), and lithium bisoxalatoborate (LiBOB).

[0060] The solid electrolyte prepared with the aliphatic polysulfone provided by the present invention as a matrix has good electrochemical stability and excellent high-voltage resistance in the voltage range of 0-5V.

[0061] Preferably, the preparation method of the solid electrolyte of the present invention is to dissolve aliphatic polysulfone and lithium salt in anhydrous acetonitrile, and then volatilize the anhydrous acetonitrile to obtain an aliphatic polysulfone-based solid electrolyte.

[0062] The present invention is illustrated by means of specific embodiments below:

[0063] Example 1: Preparation of PSF (EGDMA-DODT) polysulfone

[0064] Under ice bath conditions, add 1.9822g (0.01mol) of ethylene glycol dimethacrylate (EGDMA) and 1.8231g (0.01mol) of 3,6-dioxa-1,8-octanedithiol (DODT) to a three-necked flask, mix well, and add 50μL of n-hexylamine. React in an ice bath until the system becomes viscous, and the transparent colloid obtained at this time is P (EGDMA-DODT) polysulfide. After dissolving P (EGDMA-DODT) polysulfide in a small amount of tetrahydrofuran, add 18.44g (0.03mol) of oxone and 20mL of deionized water. React at 60℃ for 12h. After the reaction is completed, the insoluble matter in the reaction system is the target product, and the insoluble matter is washed with a large amount of deionized water to remove the inorganic salts therein. Vacuum dry at 80℃ for 12 hours to obtain polysulfone PSF (EGDMA-DODT).

[0065] Figure 1 This is the hydrogen nuclear magnetic resonance spectrum of the P(EGDMA-DODT) polysulfide prepared in this example; Figure 2 This is the hydrogen nuclear magnetic resonance spectrum of PSF (EGDMA-DODT) polysulfone prepared in this example.

[0066] Example 2: Preparation of PSF (DEGDMA-DODT) polysulfone

[0067] Under ice bath conditions, add 2.4227g (0.01mol) of diethylene glycol dimethacrylate (DEGDMA) and 1.8231g (0.01mol) of 3,6-dioxa-1,8-octanedithiol (DODT) to a three-necked flask, mix well, and add 50μL of n-hexylamine. Ice bath reaction until the system becomes viscous, and the transparent colloid obtained at this time is the polysulfide P (DEGDMA-DODT). After P (EGDMA-DODT) is dissolved in a small amount of tetrahydrofuran, 18.44g (0.03mol) of oxone and 20mL of deionized water are added. React at 50℃ for 24h. After the reaction is completed, the insoluble matter in the reaction system is the target product, and the insoluble matter is washed with a large amount of deionized water to remove the inorganic salts therein. Vacuum drying at 80℃ for 12 hours gives polysulfone PSF (DEGDMA-DODT).

[0068] Example 3: Preparation of PSF (EDA-DODT) polysulfone

[0069] Under ice bath conditions, add 1.7016g (0.01mol) of ethylene glycol diacrylate (EDA) and 1.8231g (0.01mol) of 3,6-dioxa-1,8-octanedithiol (DODT) to a three-necked flask, mix well, and add 50μL of triethylamine. React in an ice bath until the system becomes viscous. The transparent colloid obtained at this time is the polysulfide P (EDA-DODT). After P (EDA-DODT) is dissolved in a small amount of dimethyl sulfoxide, 12.29g (0.02mol) of oxone and 15mL of deionized water are added. React at 70℃ for 12h. After the reaction is completed, the insoluble matter in the reaction system is the target product, and the insoluble matter is washed with a large amount of deionized water to remove the inorganic salts therein. Vacuum dry at 80℃ for 12 hours to obtain polysulfone PSF (EDA-DODT).

[0070] Example 4: Preparation of PSF (EGDMA-EDT) polysulfone

[0071] Under ice bath conditions, add 1.9822g (0.01mol) of ethylene glycol dimethacrylate (EGDMA) and 0.9421g (0.01mol) of 1,2-ethanedithiol (EDT) to a three-necked flask, mix well, and add 50mg of triphenylphosphine. React in an ice bath until the system becomes viscous, and the transparent colloid obtained at this time is the polysulfide P (EGDMA-EDT). After P (EGDMA-EDT) is dissolved in a small amount of N-methylpyrrolidone, 24.58g (0.04mol) of oxone and 30mL of deionized water are added. React at 60℃ for 12h. After the reaction is completed, the insoluble matter in the reaction system is the target product, and the insoluble matter is washed with a large amount of deionized water to remove the inorganic salts therein. Vacuum dry at 80℃ for 12 hours to obtain polysulfone PSF (EGDMA-DODT).

[0072] Figure 3 This is the H NMR spectrum of the P(EGDMA-EDT) polysulfide prepared in this example; Figure 4 This is the hydrogen nuclear magnetic resonance spectrum of PSF (EGDMA-EDT) polysulfone prepared in this example.

[0073] Example 5: Preparation of PSF (DEGDMA-EDT) polysulfone

[0074] Under ice bath conditions, add 2.4227g (0.01mol) of diethylene glycol dimethacrylate (DEGDMA) and 0.9421g (0.01mol) of 1,2-ethanedithiol (EDT) to a three-necked flask, mix well, and add 50μL of n-hexylamine. Ice bath reaction until the system becomes viscous, and the transparent colloid obtained at this time is the polysulfide P (DEGDMA-EDT). After P (DEGDMA-EDT) is dissolved in a small amount of tetrahydrofuran, 18.44g (0.03mol) of oxone and 20mL of deionized water are added. React at 60℃ for 24h. After the reaction is completed, the insoluble matter in the reaction system is the target product, and the insoluble matter is washed with a large amount of deionized water to remove the inorganic salts therein. Vacuum drying at 80℃ for 12 hours gives polysulfone PSF (DEGDMA-DODT).

[0075] Example 6: Preparation of PSF (EDA-EDT) polysulfone

[0076] Under ice bath conditions, add 1.7016g (0.01mol) of ethylene glycol diacrylate (EDA) and 0.9421g (0.01mol) of 1,2-ethanedithiol (EDT) to a three-necked flask, mix well, and add 50μL of trimethylphosphine. React in an ice bath until the system becomes viscous. The transparent colloid obtained at this time is the polysulfide P (EDA-EDT). After P (EDA-EDT) is dissolved in a small amount of N-methylpyrrolidone, 18.44g (0.03mol) of oxone and 20mL of deionized water are added. React at 60℃ for 6h. After the reaction is completed, the insoluble matter in the reaction system is the target product, and the insoluble matter is washed with a large amount of deionized water to remove the inorganic salts therein. Vacuum dry at 80℃ for 12 hours to obtain polysulfone PSF (EDA-EDT).

[0077] Example 7: Preparation of PSF (EGDMA-EDA-DODT) polysulfone

[0078] Under ice bath conditions, add 0.9911g (0.005mol) of ethylene glycol dimethacrylate (EGDMA), 0.8508g (0.005mol) of ethylene glycol diacrylate (EDA) and 1.8231g (0.01mol) of 3,6-dioxa-1,8-octanedithiol (DODT) to a three-necked flask, mix well, and add 50μL of trimethylphosphine. React in an ice bath until the system becomes viscous, and the transparent colloid obtained at this time is the polysulfide P (EGDMA-EDA-DODT). After P (EGDMA-EDA-DODT) is dissolved in a small amount of N-methylpyrrolidone, 18.44g (0.03mol) of oxone and 20mL of deionized water are added. React at 70℃ for 6h. After the reaction is completed, the insoluble matter in the reaction system is the target product, and the insoluble matter is washed with a large amount of deionized water to remove the inorganic salts therein. The polysulfone PSF (EGDMA-EDA-DODT) was obtained by vacuum drying at 80°C for 12 hours.

[0079] Example 8: Preparation of PSF (DEGDMA-EDT-DODT) polysulfone

[0080] Under ice bath conditions, add 2.4227g (0.01mol) of diethylene glycol dimethacrylate (DEGDMA), 0.4710g (0.005mol) of 1,2-ethanedithiol (EDT) and 0.9116g (0.005mol) of 3,6-dioxa-1,8-octanedithiol (DODT) to a three-necked flask, mix well, and add 50μL of n-hexylamine. React in an ice bath until the system becomes viscous. The transparent colloid obtained at this time is the polysulfide P (DEGDMA-EDT-DODT). After P (DEGDMA-EDT-DODT) is dissolved in a small amount of N-methylpyrrolidone, 18.44g (0.03mol) of oxone and 20mL of deionized water are added. React at 60℃ for 6h. After the reaction is completed, the insoluble matter in the reaction system is the target product, and the insoluble matter is washed with a large amount of deionized water to remove the inorganic salts therein. The polysulfone PSF (DEGDMA-EDT-DODT) was obtained by vacuum drying at 80°C for 12 hours.

[0081] Example 9: Preparation of PSF (EGDMA-DODT) polysulfone-based electrolyte

[0082] The PSF (EGDMA-DODT) polysulfone obtained in Example 1 and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) were dissolved in a small amount of anhydrous acetonitrile at a mass ratio of 3:1 and mixed evenly. The polysulfone PSF (EGDMA-DODT) based electrolyte was obtained by evaporating the acetonitrile.

[0083] pass Figure 5From the AC impedance spectrum, it can be seen that the conductivity of PSF (EGDMA-DODT) polysulfone-based electrolyte at room temperature is 3.1×10 -6 S / cm.

[0084] pass Figure 6 It can be seen from the linear sweep voltammetry curve that the PSF (EGDMA-DODT) polysulfone-based electrolyte has good electrochemical stability in the voltage range of 0-5V and can be used as a high-voltage electrolyte.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for synthesizing aliphatic polysulfone, characterized in that: A dithiol and a diene monomer are used to obtain a polythioether through a thiol-ene click reaction, and then an oxidant is added to cause the polythioether to undergo an oxidation reaction to generate an aliphatic polysulfone; wherein the oxidant is a potassium peroxysulfate complex salt; The process of the thiol-ene click reaction is to mix dithiol and diene monomers of equal molar mass evenly under ice bath conditions, add an initiator to react the two to obtain a transparent colloidal polysulfide; The oxidation reaction process is to add an organic solvent to dissolve the transparent colloidal polysulfide, add the potassium peroxydisulfate complex salt and a sufficient amount of deionized water, and react under heating conditions to generate an insoluble substance, wherein the insoluble substance is an aliphatic polysulfone; The heating condition has a temperature of 40°C to 80°C and a heating time of 6 to 24 hours; The molar ratio of the potassium peroxosulfate complex salt to the dithiol is (2-5):1; The dithiol is one of 3,6-dioxa-1,8-octanedithiol and 1,2-ethanedithiol; The diene monomer is one of diethylene glycol diacrylate and diethylene glycol dimethacrylate; The structural formula of the aliphatic polysulfone is shown in formula (I): Among them, R is represented by R` is represented by R`` represents H or -CH3; The molecular weight of the aliphatic polysulfone is 5000-1000000; The aliphatic polysulfone can be used for preparing aliphatic polysulfone-based solid electrolyte.

2. The method for synthesizing aliphatic polysulfone according to claim 1, characterized in that: The initiator is one of n-hexylamine, triethylamine, triphenylphosphine, trimethylphosphine and trimethoxyphosphine.

3. The method for synthesizing aliphatic polysulfone according to claim 2, characterized in that: The organic solvent is one of tetrahydrofuran, acetonitrile, dimethyl sulfoxide, N,N-dimethylformamide, N,N-dimethylacetamide and N-methylpyrrolidone.

4. The method for synthesizing aliphatic polysulfone according to claim 1, characterized in that: The method also includes a purification step: separating insoluble matter in the system after the reaction, washing the insoluble matter with deionized water and drying the insoluble matter to obtain dry aliphatic polysulfone.

5. An aliphatic polysulfone prepared by the method for synthesizing aliphatic polysulfone according to any one of claims 1 to 4.

6. Use of the aliphatic polysulfone as claimed in claim 5 in the preparation of an aliphatic polysulfone-based solid electrolyte.

7. An aliphatic polysulfone-based solid electrolyte, characterized in that: Comprising the aliphatic polysulfone as claimed in claim 5 and a lithium salt, wherein the lithium salt accounts for 5 to 80% of the total mass of the aliphatic polysulfone-based solid electrolyte; The lithium salt is one or more of lithium hexafluorophosphate, lithium bis(trifluoromethanesulfonyl)imide, lithium difluorooxalatoborate, lithium perchlorate, and lithium bis(oxalatoborate).

Images