CN108682863B - Lithium battery polymer gel electrolyte - Google Patents
Lithium battery polymer gel electrolyte Download PDFInfo
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- CN108682863B CN108682863B CN201810593201.5A CN201810593201A CN108682863B CN 108682863 B CN108682863 B CN 108682863B CN 201810593201 A CN201810593201 A CN 201810593201A CN 108682863 B CN108682863 B CN 108682863B
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- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
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- 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
Abstract
The invention discloses a lithium battery polymer gel electrolyte, and belongs to the technical field of new energy battery materials. The lithium battery polymer gel electrolyte developed by the invention comprises a compound polymer, a plasticizer and a lithium salt electrolyte, wherein in the preparation process, polyacrylonitrile is hydrolyzed, then the hydrolyzed polyacrylonitrile is acidified by strong acid, then the acidified polyacrylonitrile is added with thionyl chloride after being dissolved, and after heating reaction, a solvent is recovered to obtain modified hydrolyzed polyacrylonitrile; and then, mixing the modified hydrolyzed polyacrylonitrile and the polyaldehyde group sodium alginate according to the mass ratio of 3: 1-5: 1, compounding to obtain a compound polymer; and then mixing the compound polymer and the plasticizer, heating and stirring for reaction, adding the lithium salt electrolyte, stirring and mixing uniformly, and preparing the film to obtain the lithium battery polymer gel electrolyte. The lithium battery polymer gel electrolyte obtained by the invention has excellent conductivity.
Description
Technical Field
The invention discloses a lithium battery polymer gel electrolyte, and belongs to the technical field of new energy battery materials.
Background
The lithium ion battery has the advantages of high working voltage, high energy density, no memory effect, long cycle life, no pollution and the like, thereby becoming a main power supply of various electronic products and becoming a research, development and application hotspot of secondary batteries in the world at present. The lithium ion battery consists of a positive electrode, a negative electrode, an electrolyte and a polymer diaphragm, wherein the diaphragm is a high value-added material with the highest technical barrier in lithium battery materials and accounts for 20-30% of the cost of the lithium battery.
Compared with the traditional system of the diaphragm and the electrolyte, the polymer electrolyte can avoid the leakage problem of the traditional liquid lithium ion battery, improve the safety performance and the energy density of the battery, and realize the advantages of thinning, lightening, shape changing and the like of the battery. The gel electrolyte is composed of a diaphragm and an electrolyte. The polymer electrolyte for manufacturing the lithium battery has to satisfy the following conditions: (1) the ionic conductivity at room temperature and below room temperature should be relatively high; (2) good mechanical properties; (3) thermal and electrochemical stability; (4) a reliable number of cycles; (5) has better compatibility with the electrode. The polymer electrolyte should be able to withstand the presence of low temperature cycling and the pressures that build up during cell operation.
The polymer electrolytes can be classified into pure polymer electrolytes [ Solid Polymer Electrolytes (SPE) ], colloidal polymer electrolytes (GPE), and Porous Polymer Electrolytes (PPE). Pure polymer electrolytes are difficult to commercialize due to low room temperature conductivity. The colloidal polymer electrolyte realizes ion conduction by utilizing liquid electrolyte molecules fixed in a polymer network with a proper microstructure, has the stability of a solid polymer and high ion conductivity of a liquid electrolyte, and shows good application prospect. The porous polymer electrolyte means that the polymer bulk has a microporous structure, and the plasticizer and the salt are present in the porous structure of the polymer bulk. The gel polymer electrolyte is a polymer electrolyte with gel-like properties after the addition of a liquid plasticizer, and compared with an all-solid polymer electrolyte, the system contains a liquid solvent with small molecular weight. The conventional lithium battery electrolyte still has the problem that the conductivity cannot be further improved, so research on the electrolyte is needed.
Disclosure of Invention
The invention mainly solves the technical problems that: aiming at the problem that the conductivity of the traditional lithium battery electrolyte cannot be further improved, the lithium battery polymer gel electrolyte is provided.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a lithium battery polymer gel electrolyte comprises the following raw materials in parts by weight:
20-30 parts of compound polymer
55-75 parts of plasticizer
8-15 parts of lithium salt electrolyte
The preparation steps of the lithium battery polymer gel electrolyte are as follows:
(1) mixing polyacrylonitrile and alkali liquor, heating and hydrolyzing in an ozone atmosphere to obtain hydrolyzed polyacrylonitrile;
(2) acidifying hydrolyzed polyacrylonitrile with strong acid to obtain acidified hydrolyzed polyacrylonitrile;
(3) dissolving acidified hydrolyzed polyacrylonitrile in a solvent, adding thionyl chloride, heating for reaction, and recovering the solvent to obtain modified hydrolyzed polyacrylonitrile;
(4) mixing polyaldehyde sodium alginate and modified hydrolyzed polyacrylonitrile according to a mass ratio of 3: 1-5: 1, compounding to obtain a compound polymer;
(5) and mixing the compound polymer and the plasticizer, heating and stirring for reaction, adding the lithium salt electrolyte, stirring and mixing uniformly, and preparing the film to obtain the lithium battery polymer gel electrolyte.
The plasticizer is epoxy oleate and dimethyl carbonate according to the mass ratio of 1: 1-10: 1 are mixed.
The lithium salt electrolyte is LiClO4，LiCF3SO3Or LiPF6Any one of them.
The solvent in the step (3) is any one of dimethylformamide, dimethyl sulfoxide, sulfolane or ethylene nitrate.
The alkali liquor in the step (1) is an alkali solution with the mass fraction of 15-30%; the alkali is any one of lithium hydroxide, sodium hydroxide or potassium hydroxide.
The strong acid in the step (2) is an acid solution with the mass fraction of 8-10%; the acid is any one of hydrochloric acid, sulfuric acid or nitric acid.
The invention has the beneficial effects that:
according to the technical scheme, polyacrylonitrile and alkali liquor are hydrolyzed in an oxidizing environment, and in the hydrolysis process, on one hand, a macromolecular chain of the polyacrylonitrile is partially broken, so that the molecular weight of the polyacrylonitrile is reduced, polymer crystallization is inhibited, the disorder of polymer chain segments is increased, and the conductivity of a product is improved; on the other hand, a cyano part in a polyacrylonitrile molecular structure is converted into an amido group and a carboxyl group, so that the property of polyacrylonitrile is changed, the solubility of the polyacrylonitrile is improved, in the subsequent reaction process, part of groups in the acidified hydrolyzed polyacrylonitrile molecular structure form an acyl chloride structure under the action of thionyl chloride, the acyl chloride group has high reaction activity, and the modified hydrolyzed polyacrylonitrile and the polyaldehyde group sodium alginate form new chemical bonding in the subsequent preparation process, so that the two are effectively combined to form an organic whole, the mechanical strength of the membrane is effectively improved, the formation of the chemical bonding is also favorable for further improving the stability of a gel skeleton, and in addition, the compatibility of the gel electrolyte and a lithium battery can be improved, so that the product can be widely applied to the lithium battery.
Detailed Description
According to the mass ratio of 1: 10-1: 20, mixing polyacrylonitrile and an aqueous alkali with the mass fraction of 15-30%, pouring the mixture into a reaction kettle, introducing ozone into the reaction kettle at the speed of 60-80 mL/min, heating, stirring and hydrolyzing for 4-6 hours in an ozone atmosphere at the temperature of 95-100 ℃ and the rotating speed of 400-500 r/min, naturally cooling the materials in the reaction kettle to room temperature, filtering to obtain filter residues, washing the filter residues with deionized water for 4-6 times, transferring the washed filter residues into an oven, and drying to constant weight at the temperature of 75-80 ℃ to obtain dried filter residues, namely hydrolyzed polyacrylonitrile; according to the mass ratio of 1: 8-1: 10, mixing hydrolyzed polyacrylonitrile and an acid solution with the mass fraction of 8-10% and pouring the mixture into a three-neck flask, moving the three-neck flask into a digital display speed measurement constant-temperature magnetic stirrer, stirring and acidifying for 45-60 min at constant temperature under the conditions that the temperature is 55-65 ℃ and the rotating speed is 300-400 r/min, filtering to obtain a filter cake, washing the obtained filter cake for 4-6 times by using deionized water, transferring the washed filter cake into a drying oven, and drying to constant weight under the condition that the temperature is 75-85 ℃ to obtain a dried filter cake, namely acidified hydrolyzed polyacrylonitrile; according to the mass ratio of 1: 10-1: dissolving acidified hydrolyzed polyacrylonitrile in a solvent, adding thionyl chloride with the mass 0.6-0.8 times that of the acidified hydrolyzed polyacrylonitrile, heating and stirring for reaction for 3-5 hours at the temperature of 75-80 ℃ and the rotating speed of 600-800 r/min, and then carrying out reduced pressure distillation to recover the solvent to obtain modified hydrolyzed polyacrylonitrile; sodium alginate and water are mixed according to the mass ratio of 1: 8-1: 10, standing and swelling for 8-24 h, and adding high iodine with the mass of 0.1-0.2 time of that of sodium alginate into the swelled sodium alginateSodium, then stirring and reacting for 2-3 h at a constant temperature under the conditions that the temperature is 75-80 ℃ and the rotating speed is 400-600 r/min, and concentrating and drying to obtain multi-aldehyde sodium alginate; mixing polyaldehyde sodium alginate and modified hydrolyzed polyacrylonitrile according to a mass ratio of 3: 1-5: 1, compounding to obtain a compound polymer; according to the weight parts, sequentially taking 20-30 parts of compound polymer, 55-75 parts of plasticizer and 8-15 parts of lithium salt electrolyte, mixing the compound polymer and the plasticizer, pouring the mixture into a reactant, heating, stirring and reacting for 3-5 hours at the temperature of 80-85 ℃ and the rotating speed of 800-1200 r/min, then adding the lithium salt electrolyte, continuously stirring and mixing for 1-3 hours, discharging, and preparing a film to obtain the lithium battery polymer gel electrolyte. The plasticizer is epoxy oleate and dimethyl carbonate according to the mass ratio of 1: 1-10: 1 are mixed. The lithium salt electrolyte is LiClO4，LiCF3SO3Or LiPF6Any one of them. The solvent is any one of dimethylformamide, dimethyl sulfoxide, sulfolane or ethylene nitrate. The alkali is any one of lithium hydroxide, sodium hydroxide or potassium hydroxide. The acid is any one of hydrochloric acid, sulfuric acid or nitric acid.
Example 1
According to the mass ratio of 1: 20, mixing polyacrylonitrile and 30% by mass of aqueous alkali, pouring the mixture into a reaction kettle, introducing ozone into the reaction kettle at a speed of 80mL/min, heating, stirring and hydrolyzing for 6 hours in an ozone atmosphere at a temperature of 100 ℃ and a rotating speed of 500r/min, naturally cooling the materials in the reaction kettle to room temperature, filtering to obtain filter residue, washing the filter residue for 6 times by using deionized water, transferring the washed filter residue into an oven, and drying to constant weight at a temperature of 80 ℃ to obtain dried filter residue, namely hydrolyzed polyacrylonitrile; according to the mass ratio of 1: 10 mixing hydrolyzed polyacrylonitrile and 10% acid solution, pouring into a three-neck flask, transferring the three-neck flask into a digital display speed measurement constant temperature magnetic stirrer, stirring and acidifying at constant temperature and 400r/min for 60min at 65 ℃, filtering to obtain a filter cake, washing the obtained filter cake with deionized water for 6 times, transferring the washed filter cake into a drying oven, drying at 85 ℃ to constant weight to obtain a dry productThe filter cake is acidified hydrolyzed polyacrylonitrile; according to the mass ratio of 1: 15, dissolving the acidified hydrolyzed polyacrylonitrile in a solvent, adding thionyl chloride which is 0.8 time of the mass of the acidified hydrolyzed polyacrylonitrile, heating and stirring the mixture for reaction for 5 hours at the temperature of 80 ℃ and the rotating speed of 800r/min, and then distilling the mixture under reduced pressure to recover the solvent to obtain the modified hydrolyzed polyacrylonitrile; sodium alginate and water are mixed according to the mass ratio of 1: 10, standing and swelling for 24 hours, adding sodium periodate with the mass of 0.2 time of that of the sodium alginate into the swelled sodium alginate, stirring and reacting for 3 hours at the constant temperature of 80 ℃ and the rotating speed of 600r/min, concentrating and drying to obtain multi-aldehyde sodium alginate; mixing polyaldehyde sodium alginate and modified hydrolyzed polyacrylonitrile according to a mass ratio of 5: 1, compounding to obtain a compound polymer; according to the weight parts, 30 parts of compound polymer, 75 parts of plasticizer and 15 parts of lithium salt electrolyte are taken in sequence, the compound polymer and the plasticizer are mixed and poured into a reactant, the mixture is heated, stirred and reacted for 5 hours at the temperature of 85 ℃ and the rotating speed of 1200r/min, then the lithium salt electrolyte is added, the mixture is continuously stirred and mixed for 3 hours, and then the material is discharged and the membrane is prepared, so that the lithium battery polymer gel electrolyte is obtained. The plasticizer is epoxy oleate and dimethyl carbonate according to a mass ratio of 10: 1 are mixed. The lithium salt electrolyte is LiClO4. The solvent is dimethylformamide. The alkali is lithium hydroxide. The acid is hydrochloric acid.
Example 2
According to the mass ratio of 1: 15 dissolving polyacrylonitrile in a solvent, adding thionyl chloride which is 0.8 time of the mass of the polyacrylonitrile, heating and stirring the mixture for reaction for 5 hours at the temperature of 80 ℃ and the rotating speed of 800r/min, and then carrying out reduced pressure distillation to recover the solvent to obtain the modified hydrolyzed polyacrylonitrile; sodium alginate and water are mixed according to the mass ratio of 1: 10, standing and swelling for 24 hours, adding sodium periodate with the mass of 0.2 time of that of the sodium alginate into the swelled sodium alginate, stirring and reacting for 3 hours at the constant temperature of 80 ℃ and the rotating speed of 600r/min, concentrating and drying to obtain multi-aldehyde sodium alginate; mixing polyaldehyde sodium alginate and modified hydrolyzed polyacrylonitrile according to a mass ratio of 5: 1, compounding to obtain a compound polymer; according to the parts by weight, 30 parts of compound polymer, 75 parts of plasticizer and 15 parts of lithium salt are taken in sequenceAnd (3) electrolyte, namely mixing the compound polymer and the plasticizer, pouring the mixture into a reactant, heating and stirring the mixture for reaction for 5 hours at the temperature of 85 ℃ and the rotating speed of 1200r/min, adding the lithium salt electrolyte, continuously stirring and mixing the mixture for 3 hours, discharging the mixture, and preparing the membrane to obtain the lithium battery polymer gel electrolyte. The plasticizer is epoxy oleate and dimethyl carbonate according to a mass ratio of 10: 1 are mixed. The lithium salt electrolyte is LiClO4. The solvent is dimethylformamide. The alkali is lithium hydroxide. The acid is hydrochloric acid.
Example 3
According to the mass ratio of 1: 20, mixing polyacrylonitrile and 30% by mass of aqueous alkali, pouring the mixture into a reaction kettle, introducing ozone into the reaction kettle at a speed of 80mL/min, heating, stirring and hydrolyzing for 6 hours in an ozone atmosphere at a temperature of 100 ℃ and a rotating speed of 500r/min, naturally cooling the materials in the reaction kettle to room temperature, filtering to obtain filter residue, washing the filter residue for 6 times by using deionized water, transferring the washed filter residue into an oven, and drying to constant weight at a temperature of 80 ℃ to obtain dried filter residue, namely hydrolyzed polyacrylonitrile; according to the mass ratio of 1: 10, mixing hydrolyzed polyacrylonitrile and an acid solution with the mass fraction of 10%, pouring the mixture into a three-neck flask, moving the three-neck flask into a digital display speed measurement constant-temperature magnetic stirrer, stirring and acidifying for 60min at a constant temperature under the conditions that the temperature is 65 ℃ and the rotating speed is 400r/min, filtering to obtain a filter cake, washing the obtained filter cake for 6 times by deionized water, transferring the washed filter cake into a drying oven, and drying to constant weight under the condition that the temperature is 85 ℃ to obtain a dried filter cake, namely the acidified hydrolyzed polyacrylonitrile; sodium alginate and water are mixed according to the mass ratio of 1: 10, standing and swelling for 24 hours, adding sodium periodate with the mass of 0.2 time of that of the sodium alginate into the swelled sodium alginate, stirring and reacting for 3 hours at the constant temperature of 80 ℃ and the rotating speed of 600r/min, concentrating and drying to obtain multi-aldehyde sodium alginate; mixing polyaldehyde sodium alginate and modified hydrolyzed polyacrylonitrile according to a mass ratio of 5: 1, compounding to obtain a compound polymer; according to the weight portion, 30 portions of compound polymer, 75 portions of plasticizer and 15 portions of lithium salt electrolyte are taken in sequence, the compound polymer and the plasticizer are mixed and poured into reactants, the temperature is 85 ℃, and the rotating speed is 1Heating and stirring for reaction for 5h under the condition of 200r/min, then adding a lithium salt electrolyte, continuously stirring and mixing for 3h, discharging, and preparing a membrane to obtain the lithium battery polymer gel electrolyte. The plasticizer is epoxy oleate and dimethyl carbonate according to a mass ratio of 10: 1 are mixed. The lithium salt electrolyte is LiClO4. The solvent is dimethylformamide. The alkali is lithium hydroxide. The acid is hydrochloric acid.
Example 4
According to the mass ratio of 1: 20, mixing polyacrylonitrile and 30% by mass of aqueous alkali, pouring the mixture into a reaction kettle, introducing ozone into the reaction kettle at a speed of 80mL/min, heating, stirring and hydrolyzing for 6 hours in an ozone atmosphere at a temperature of 100 ℃ and a rotating speed of 500r/min, naturally cooling the materials in the reaction kettle to room temperature, filtering to obtain filter residue, washing the filter residue for 6 times by using deionized water, transferring the washed filter residue into an oven, and drying to constant weight at a temperature of 80 ℃ to obtain dried filter residue, namely hydrolyzed polyacrylonitrile; according to the mass ratio of 1: 10, mixing hydrolyzed polyacrylonitrile and an acid solution with the mass fraction of 10%, pouring the mixture into a three-neck flask, moving the three-neck flask into a digital display speed measurement constant-temperature magnetic stirrer, stirring and acidifying for 60min at a constant temperature under the conditions that the temperature is 65 ℃ and the rotating speed is 400r/min, filtering to obtain a filter cake, washing the obtained filter cake for 6 times by deionized water, transferring the washed filter cake into a drying oven, and drying to constant weight under the condition that the temperature is 85 ℃ to obtain a dried filter cake, namely the acidified hydrolyzed polyacrylonitrile; according to the mass ratio of 1: 15, dissolving the acidified hydrolyzed polyacrylonitrile in a solvent, adding thionyl chloride which is 0.8 time of the mass of the acidified hydrolyzed polyacrylonitrile, heating and stirring the mixture for reaction for 5 hours at the temperature of 80 ℃ and the rotating speed of 800r/min, and then distilling the mixture under reduced pressure to recover the solvent to obtain the modified hydrolyzed polyacrylonitrile; mixing polyaldehyde sodium alginate and modified hydrolyzed polyacrylonitrile according to a mass ratio of 5: 1, compounding to obtain a compound polymer; according to the weight portion, 30 portions of compound polymer, 75 portions of plasticizer and 15 portions of lithium salt electrolyte are taken in turn, the compound polymer and the plasticizer are mixed and poured into reactants, the reactants are heated, stirred and reacted for 5 hours at the temperature of 85 ℃ and the rotating speed of 1200r/min, then the lithium salt electrolyte is added, the mixture is continuously stirred and mixed for 3 hours, and then the material is discharged,and (5) preparing the membrane to obtain the lithium battery polymer gel electrolyte. The plasticizer is epoxy oleate and dimethyl carbonate according to a mass ratio of 10: 1 are mixed. The lithium salt electrolyte is LiClO4. The solvent is dimethylformamide. The alkali is lithium hydroxide. The acid is hydrochloric acid.
Example 5
According to the mass ratio of 1: 20, mixing polyacrylonitrile and 30% by mass of aqueous alkali, pouring the mixture into a reaction kettle, introducing ozone into the reaction kettle at a speed of 80mL/min, heating, stirring and hydrolyzing for 6 hours in an ozone atmosphere at a temperature of 100 ℃ and a rotating speed of 500r/min, naturally cooling the materials in the reaction kettle to room temperature, filtering to obtain filter residue, washing the filter residue for 6 times by using deionized water, transferring the washed filter residue into an oven, and drying to constant weight at a temperature of 80 ℃ to obtain dried filter residue, namely hydrolyzed polyacrylonitrile; according to the mass ratio of 1: 10, mixing hydrolyzed polyacrylonitrile and an acid solution with the mass fraction of 10%, pouring the mixture into a three-neck flask, moving the three-neck flask into a digital display speed measurement constant-temperature magnetic stirrer, stirring and acidifying for 60min at a constant temperature under the conditions that the temperature is 65 ℃ and the rotating speed is 400r/min, filtering to obtain a filter cake, washing the obtained filter cake for 6 times by deionized water, transferring the washed filter cake into a drying oven, and drying to constant weight under the condition that the temperature is 85 ℃ to obtain a dried filter cake, namely the acidified hydrolyzed polyacrylonitrile; according to the mass ratio of 1: 15, dissolving the acidified hydrolyzed polyacrylonitrile in a solvent, adding thionyl chloride which is 0.8 time of the mass of the acidified hydrolyzed polyacrylonitrile, heating and stirring the mixture for reaction for 5 hours at the temperature of 80 ℃ and the rotating speed of 800r/min, and then distilling the mixture under reduced pressure to recover the solvent to obtain the modified hydrolyzed polyacrylonitrile; according to the weight parts, 30 parts of compound polymer, 75 parts of plasticizer and 15 parts of lithium salt electrolyte are taken in sequence, the compound polymer and the plasticizer are mixed and poured into a reactant, the mixture is heated, stirred and reacted for 5 hours at the temperature of 85 ℃ and the rotating speed of 1200r/min, then the lithium salt electrolyte is added, the mixture is continuously stirred and mixed for 3 hours, and then the material is discharged and the membrane is prepared, so that the lithium battery polymer gel electrolyte is obtained. The plasticizer is epoxy oleate and dimethyl carbonate according to a mass ratio of 10: 1 are mixed. The lithium salt electrolyte is LiClO4. The solvent is dimethyl methylAn amide. The alkali is lithium hydroxide. The acid is hydrochloric acid.
Comparative example: lithium battery electrolyte produced by certain new energy science and technology limited in Shanghai.
The electrolytes obtained in examples 1 to 5 and comparative example products were subjected to performance tests by the following specific test methods:
the conductivity of the electrolyte was measured, and the specific measurement results are shown in table 1:
table 1: performance test meter
As can be seen from the detection results in Table 1, the lithium battery polymer gel electrolyte obtained by the invention has excellent conductivity.
Claims (6)
1. The lithium battery polymer gel electrolyte is characterized by comprising the following raw materials in parts by weight:
20-30 parts of compound polymer
55-75 parts of plasticizer
8-15 parts of lithium salt electrolyte
The preparation steps of the lithium battery polymer gel electrolyte are as follows:
(1) mixing polyacrylonitrile and alkali liquor, heating and hydrolyzing in an ozone atmosphere to obtain hydrolyzed polyacrylonitrile;
(2) acidifying hydrolyzed polyacrylonitrile with strong acid to obtain acidified hydrolyzed polyacrylonitrile;
(3) dissolving acidified hydrolyzed polyacrylonitrile in a solvent, adding thionyl chloride, heating for reaction, and recovering the solvent to obtain modified hydrolyzed polyacrylonitrile;
(4) mixing polyaldehyde sodium alginate and modified hydrolyzed polyacrylonitrile according to a mass ratio of 3: 1-5: 1, compounding to obtain a compound polymer;
(5) and mixing the compound polymer and the plasticizer, heating and stirring for reaction, adding the lithium salt electrolyte, stirring and mixing uniformly, and preparing the film to obtain the lithium battery polymer gel electrolyte.
2. The lithium battery polymer gel electrolyte as claimed in claim 1, wherein the plasticizer is epoxy oleate and dimethyl carbonate in a mass ratio of 1: 1-10: 1 are mixed.
3. The polymer gel electrolyte for lithium battery as claimed in claim 1, wherein the lithium salt electrolyte is LiClO4，LiCF3SO3Or LiPF6Any one of them.
4. The lithium battery polymer gel electrolyte of claim 1, wherein the solvent in step (3) is any one of dimethylformamide, dimethylsulfoxide, sulfolane or ethylene nitrate.
5. The lithium battery polymer gel electrolyte as claimed in claim 1, wherein the alkali solution in the step (1) is 15-30% by weight of alkali solution; the alkali is any one of lithium hydroxide, sodium hydroxide or potassium hydroxide.
6. The lithium battery polymer gel electrolyte as claimed in claim 1, wherein the strong acid in the step (2) is an acid solution with a mass fraction of 8-10%; the acid is any one of hydrochloric acid, sulfuric acid or nitric acid.
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