CN111082136B - Power lithium battery fiber membrane solid electrolyte and preparation method thereof - Google Patents

Power lithium battery fiber membrane solid electrolyte and preparation method thereof Download PDF

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CN111082136B
CN111082136B CN201911371784.8A CN201911371784A CN111082136B CN 111082136 B CN111082136 B CN 111082136B CN 201911371784 A CN201911371784 A CN 201911371784A CN 111082136 B CN111082136 B CN 111082136B
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spinning solution
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lithium
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CN111082136A (en
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曾军堂
陈庆
廖健淞
何方
陈涛
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Shandong Yiwei New Material Co.,Ltd.
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Chengdu New Keli Chemical Science Co Ltd
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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
    • 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
    • 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
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
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    • 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

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Abstract

The invention provides a preparation method of a fiber membrane solid electrolyte of a power lithium battery, which comprises the steps of dispersing and melting an ionic liquid and a polymer to prepare a spinning solution A; adding the spinning solution A and the spinning solution B into a spinning channel, and carrying out coaxial electrostatic spinning to ensure that the spinning solution A is on the outer layer and the spinning solution B is on the inner layer; and spraying lithium silicate aqueous solution on the surface of the outer layer, spraying the lithium silicate aqueous solution on a roller for deposition, treating the lithium silicate aqueous solution in weak acid solution, pressing and drying to obtain the power lithium battery fiber membrane solid electrolyte. According to the invention, the lithium compound is encapsulated in the inner layer of the fiber through coaxial spinning, so that the inorganic lithium compound is stabilized, the surface of the composite fiber forms loose and micro-pores through gelation of lithium silicate, and the conductivity is greatly improved due to good interface performance. The preparation process of the invention has easily controlled and stable process and is suitable for large-scale production.

Description

Power lithium battery fiber membrane solid electrolyte and preparation method thereof
Technical Field
The invention relates to the field of lithium battery materials, in particular to a power lithium battery fiber membrane solid electrolyte and a preparation method thereof.
Background
With the progress of economic globalization and the increasing demand for energy, finding new energy storage devices has become a focus of attention in the field related to new energy. Lithium Ion Battery (Li-Ion, Lithium Ion Battery): is a secondary battery (rechargeable battery) that operates by mainly relying on lithium ions moving between a positive electrode and a negative electrode. During charging and discharging, Li + is inserted and extracted back and forth between two electrodes: during charging, Li + is extracted from the positive electrode and is inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Compared with nickel-cadmium and nickel-hydrogen batteries, the lithium ion battery has the advantages of high voltage, large specific energy, long cycle life, good safety performance, small self-discharge, no memory effect, rapid charge and discharge, wide working temperature range and the like, and is widely applied to various fields of electric automobiles, electric bicycles, electric motorcycles, solar photovoltaic and wind power generation energy storage systems, intelligent power grid energy storage systems, mobile communication base stations, electric power, chemical engineering, hospital standby UPS, EPS power supplies, security and protection lighting, portable mobile power supplies, mine safety equipment and the like.
With the application of lithium batteries in the field of power, the safety, high capacity and long life of lithium ion batteries become critical. However, the organic liquid electrolyte is easy to leak and burn, so that potential safety hazards exist, and the raw materials are high in price. In recent years, solid electrolytes have been rapidly developed for use in lithium ion batteries. With the application of lithium batteries in the field of power, the safety, high capacity and long life of lithium ion batteries become critical. The electrolyte of the lithium ion secondary battery is a flammable liquid organic matter which is widely adopted at present, and when the size of the battery is further enlarged and the charging and discharging power is further improved, the electrolyte brings a lot of unpredictable potential safety hazards to the use of the battery. In recent years, inorganic solid-phase electrolytes are proposed to replace organic liquid-phase electrolytes, so that potential safety hazards in the large-scale application process of lithium ion batteries are eliminated.
Among them, the replacement of liquid electrolyte with solid polymer electrolyte is a great progress in the development of lithium ion batteries. The solid polymer electrolyte is a novel electrolyte formed by compounding a polymer body and metal salt, does not contain an organic solvent, does not have the safety problems of leakage and the like, has good flexibility, can relieve the volume change of active substances in the charge and discharge process, and obviously improves the cycle life and the safety performance of the battery. The polymer electrolyte is easy to process into a film and can be made into a full-plastic structure, so that ultra-thin batteries with various shapes can be manufactured, and the volume change of electrodes in the charging and discharging processes of the batteries can be well adapted.
An ideal lithium battery polymer electrolyte matrix should have: firstly, the polymer matrix has high dielectric constant, and the chain segment contains polar groups capable of complexing with metal ions, and the groups can dissolve lithium salt and form a polymer/salt composite system; secondly, the polymer can provide a channel for the migration of ions, and a polymer chain has more amorphous areas and better flexibility according to the conductive mechanism of polymer electrolyte; the polymer has better electrochemical stability; and fourthly, the polymer has good mechanical property, can inhibit the growth of lithium dendrite and endows the battery with good processing performance. In recent years, a large number of different types of polymer electrolytes such as polyethylene oxide (PEO), polypropylene carbonate (PPC), Polysiloxane (PSLICs), and polyvinylidene fluoride (PVDF) have been reported.
The solid polymer electrolyte is mostly prepared by compounding a polymer matrix and lithium salt, however, lithium ions and counter ions provided by the lithium salt can migrate under the action of an electric field force, and significant concentration polarization can be caused by simultaneous migration of anions and cations, so that the conductivity of a system is attenuated, the impedance of the system is increased, the transmission efficiency of the electrolyte is low, and the application of the polymer electrolyte in the field of a power battery with quick start is hindered. Therefore, designing and developing a polymer matrix with a novel structure and optimizing the composition of the polymer electrolyte and the structure of the all-solid-state battery are the key points for preparing the high-performance all-solid-state lithium battery.
Disclosure of Invention
Aiming at the defect of low transmission efficiency of the existing polymer solid electrolyte, the invention provides the fiber membrane solid electrolyte of the power lithium battery and the preparation method thereof.
In order to solve the problems, the invention adopts a power lithium battery fiber membrane solid electrolyte and a preparation method thereof.
A preparation method of a power lithium battery fiber membrane solid electrolyte comprises the following steps:
(1) dispersing and melting the ionic liquid and the polymer to prepare spinning solution A;
(2) grinding the lithium compound to a nano level, and forming a spinning solution B by the lithium compound, the silicon dioxide sol and polyethylene glycol;
(3) adding the spinning solution A and the spinning solution B into a spinning channel, carrying out coaxial spinning, enabling the spinning solution A to be on the outer layer and the spinning solution B to be on the inner layer, spraying a lithium silicate aqueous solution on the surface of the outer layer through a nozzle, and carrying out spinning and depositing on a roller to obtain a felt-shaped fiber membrane;
(4) and (4) treating the felt-shaped fiber membrane obtained in the step (3) with weak acid liquid to enable lithium silicate on the surface to be gelatinized, and further pressing and drying to obtain the loose power lithium battery fiber membrane solid electrolyte with micropores on the surface.
Preferably, the ionic liquid is one of 1-ethyl-3-methylimidazole bistrifluoromethylsulfonyl imide salt, 1-propyl-3-methylimidazole bistrifluoromethylsulfonyl imide salt, 1-butyl-3-methylimidazole bistrifluoromethylsulfonyl imide salt, N-methyl, propyl piperidine bistrifluoromethylsulfonyl imide salt, N-methyl, butyl piperidine bistrifluoromethylsulfonyl imide salt, N-methyl, propyl pyrrolidine bistrifluoromethylsulfonyl imide salt, N-methyl, butyl pyrrolidine bistrifluoromethylsulfonyl imide salt; the polymer is polyoxyethylene.
Preferably, the mass ratio of the ionic liquid to the polymer is (0.05-0.08) to (0.95-0.92), the melting temperature is set to be 100 ℃, and the ionic liquid and the polymer are uniformly mixed and melted in a high-speed mixer to prepare the spinning solution A.
Preferably, the lithium compound is Li7La3Zr2O12、Li1.3Al0.3Ti1.7(PO4)3、Li3PS4、Li9.6P3S12、Li7P3S11、Li11Si2PS12、Li10SiP2S12、Li10SnP2S12、Li10GeP2S12、Li10Si0.5Ge0.5P2S12、Li10Ge0.5Sn0.5P2S12、Li10Si0.5Sn0.5P2S12、Li9.54Si1.74P1.44S11.7Cl0.3、 Li6PS5Br、Li6PS5Br、Li7PS6、Li7PS5I、Li7PO5Cl、Li3N、Li7PN4、LiSi2N3、LiPN2、Li2NH、Li3(NH2)2I、LiBH4、LiAlH4、LiNH2、Li2CdCl4The particle size of the lithium compound is 20-800 nm.
Preferably, the mass ratio of the lithium compound to the silica sol to the polyethylene glycol is (10-15): (77-88): (2-8), wherein the solid content of the silica sol is 10-20%.
Preferably, the modulus of the lithium silicate aqueous solution in the step (3) is 2.2 to 4.5. And coating a lithium silicate aqueous solution to wet the surface of the fiber.
Preferably, the coaxial spinning parameters in the step (3) are 12-30KV and 10-20cm of positive and negative electrode spacing.
Preferably, the weak acid solution in the step (4) is one of phosphoric acid and acetic acid with pH of 4-6.
The invention also provides a power lithium battery fiber membrane solid electrolyte prepared by the method.
Aiming at the defect of low transmission efficiency of the existing polymer solid electrolyte, the invention provides a preparation method of a fiber membrane solid electrolyte of a power lithium battery, which comprises the steps of preparing a spinning solution A by dispersing and melting an ionic liquid and a polymer; grinding the lithium compound to a nano level, and forming a spinning solution B by the lithium compound, the silicon dioxide sol and polyethylene glycol; adding the spinning solution A and the spinning solution B into a spinning channel, and carrying out coaxial spinning to ensure that the spinning solution A is on the outer layer and the spinning solution B is on the inner layer; spraying lithium silicate solution on the surface of the outer layer through a nozzle, and spraying the lithium silicate solution on a roller for deposition to obtain a felt-like fibrous membrane; and (3) treating with weak acid solution to gelatinize lithium silicate on the surface, further pressing and drying to obtain loose power lithium battery fiber membrane solid electrolyte with micropores on the surface. Adopting electrostatic coaxial spinning, when the electric field force is large enough, polymer liquid drops overcome the surface tension to form jet trickle, and finally fall on a roller rotating continuously to form a fiber film similar to a felt shape; the fiber is sprayed with lithium silicate solution and further treated in weak acid solution to gelatinize the lithium silicate on the surface, and the solid electrolyte of the fiber membrane of the power lithium battery is obtained after pressing and drying.
Compared with the prior art, the fiber membrane solid electrolyte for the power lithium battery and the preparation method thereof have the outstanding characteristics and excellent effects that:
1. the invention combines organic and inorganic through spinning, and encapsulates lithium compound in the inner layer of the fiber, thereby not only stabilizing the inorganic lithium compound, but also forming loose and micropore on the surface of the composite fiber through lithium silicate gelation, and having good boundaryThe surface performance greatly improves the conductivity. The conductivity of the obtained fiber membrane solid electrolyte at room temperature of the ionic conductor is more than 10-3S/cm and excellent mechanical property.
2. The invention has simple process method and easily controlled and stable preparation process, and is suitable for large-scale production and manufacture.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
(1) Preparing 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt and polyoxyethylene according to the mass ratio of 0.05: 0.95, setting the melting temperature to be 100 ℃, and uniformly mixing and melting in a high-speed mixer to prepare a spinning solution A;
(2) mixing Li7La3Zr2O12Grinding until the particle size is 200nm, the solid content is 15% of silica sol and polyethylene glycol to form a spinning solution B, wherein the mass ratio of the lithium compound to the silica sol to the polyethylene glycol is 12: 80: 8;
(3) adding the spinning solution A and the spinning solution B into a spinning channel, wherein the feeding mass ratio of the spinning solution A to the spinning solution B is 1:3, carrying out coaxial spinning, wherein the coaxial spinning parameters are 30KV and the positive and negative electrode spacing is 10cm, so that the spinning solution A is on the outer layer, the spinning solution B is on the inner layer, the surface of the outer layer is sprayed with a lithium silicate aqueous solution with the modulus of 2.5 through a nozzle, and the spinning is carried out on a continuously rotating roller for deposition, thus obtaining a felt-shaped fiber membrane;
(4) and (4) soaking the felty fiber membrane obtained in the step (3) in an acetic acid solution with the pH value of 5 for 5min to gelatinize lithium silicate on the surface, further performing roller pressing and shaping, and drying at 70 ℃ to obtain the loose power lithium battery fiber membrane solid electrolyte with micropores on the surface.
Example 2
(1) Preparing ionic liquid 1-propyl-3-methylimidazole bistrifluoromethane sulfimide salt and polyoxyethylene according to the mass ratio of 0.07: 0.93, setting the melting temperature to be 100 ℃, and uniformly mixing and melting in a high-speed mixer to prepare spinning solution A;
(2) mixing lithium compound Li10Si0.5Ge0.5P2S12Grinding until the particle size is 800nm, the solid content is 20 percent, and the spinning solution B is composed of silica sol and polyethylene glycol, wherein the mass ratio of the lithium compound to the silica sol to the polyethylene glycol is 13: 81: 6;
(3) adding the spinning solution A and the spinning solution B into a spinning channel, wherein the feeding mass ratio of the spinning solution A to the spinning solution B is 1:3, carrying out coaxial spinning, wherein the coaxial spinning parameters are 30KV and the positive and negative electrode spacing is 10cm, so that the spinning solution A is on the outer layer, the spinning solution B is on the inner layer, the surface of the outer layer is sprayed with a lithium silicate aqueous solution with the modulus of 2.5 through a nozzle, and the spinning is carried out on a continuously rotating roller for deposition, thus obtaining a felt-shaped fiber membrane;
(4) and (4) soaking the felty fiber membrane obtained in the step (3) in an acetic acid solution with the pH value of 5 for 8min to gelatinize lithium silicate on the surface, further performing roller pressing and shaping, and drying at 70 ℃ to obtain the loose power lithium battery fiber membrane solid electrolyte with micropores on the surface.
Example 3
(1) Preparing ionic liquid N-methyl, propyl piperidine bistrifluoromethanesulfonimide salt and polyoxyethylene according to the mass ratio of 0.06: 0.94, setting the melting temperature to be 100 ℃, and uniformly mixing and melting in a high-speed mixer to prepare spinning solution A;
(2) mixing lithium compound LiSi2N3Grinding until the particle size is 20nm, the solid content is 10% of silica sol and polyethylene glycol to form a spinning solution B, wherein the mass ratio of the lithium compound to the silica sol to the polyethylene glycol is 10: 88: 2;
(3) adding the spinning solution A and the spinning solution B into a spinning channel, wherein the feeding mass ratio of the spinning solution A to the spinning solution B is 1:3, carrying out coaxial spinning, wherein the coaxial spinning parameters are 30KV and the positive and negative electrode spacing is 10cm, so that the spinning solution A is on the outer layer, the spinning solution B is on the inner layer, the surface of the outer layer is sprayed with a lithium silicate aqueous solution with the modulus of 2.5 through a nozzle, and the spinning is carried out on a continuously rotating roller for deposition, thus obtaining a felt-shaped fiber membrane;
(4) and (4) soaking the felty fiber membrane obtained in the step (3) in an acetic acid solution with the pH value of 5 for 10min to gelatinize lithium silicate on the surface, further performing roller pressing and shaping, and drying at 70 ℃ to obtain the loose power lithium battery fiber membrane solid electrolyte with micropores on the surface.
Example 4
(1) Uniformly mixing and melting ionic liquid 1-propyl-3-methylimidazole bistrifluoromethanesulfonylimide salt and polyoxyethylene in a high-speed mixer at a melting temperature of 149 ℃ according to a mass ratio of 0.07: 0.93 to prepare a spinning solution A;
(2) mixing lithium compound Li3PS4Grinding until the particle size is 700nm, the solid content is 14 percent, and the spinning solution B is composed of silica sol and polyethylene glycol, wherein the mass ratio of the lithium compound to the silica sol to the polyethylene glycol is 15: 77: 8;
(3) adding the spinning solution A and the spinning solution B into a spinning channel, wherein the feeding mass ratio of the spinning solution A to the spinning solution B is 1:3, carrying out coaxial spinning, wherein the coaxial spinning parameters are 30KV and the positive and negative electrode spacing is 10cm, so that the spinning solution A is on the outer layer, the spinning solution B is on the inner layer, the surface of the outer layer is sprayed with a lithium silicate aqueous solution with the modulus of 2.5 through a nozzle, and the spinning is carried out on a continuously rotating roller for deposition, thus obtaining a felt-shaped fiber membrane;
(4) and (4) soaking the felty fiber membrane obtained in the step (3) in an acetic acid solution with the pH value of 5 for 5min to gelatinize lithium silicate on the surface, further performing roller pressing and shaping, and drying at 70 ℃ to obtain the loose power lithium battery fiber membrane solid electrolyte with micropores on the surface.
Comparative example 1
(1) Preparing 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt and polyoxyethylene according to the mass ratio of 0.05: 0.95, setting the melting temperature to be 100 ℃, and uniformly mixing and melting in a high-speed mixer to prepare a spinning solution A;
(2) mixing Li7La3Zr2O12Grinding to obtain powder with particle diameter of 200nm and solid content of 15%The spinning solution B consists of silica sol and polyethylene glycol, and the mass ratio of the lithium compound to the silica sol to the polyethylene glycol is 12: 80: 8;
(3) mixing the spinning solution A and the spinning solution B according to the mass ratio of 1:3, directly spinning, wherein the spinning parameters are 30KV and the distance between a positive electrode and a negative electrode is 10cm, spraying a lithium silicate aqueous solution with the modulus of 2.5 on the surface of an outer layer through a nozzle, and depositing the lithium silicate aqueous solution on a roller which continuously rotates through spinning to obtain a felt-shaped fibrous membrane;
(4) and (4) soaking the felty fiber membrane obtained in the step (3) in an acetic acid solution with the pH value of 5 for 5min to gelatinize lithium silicate on the surface, further performing roller pressing and shaping, and drying at 70 ℃ to obtain the loose power lithium battery fiber membrane solid electrolyte with micropores on the surface.
Comparative example 1 compared to example 1, no co-axial spinning was performed and no lithium compound was encapsulated in the inner layer of the fiber, affecting the interfacial properties.
Comparative example 2
(1) Preparing 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt and polyoxyethylene according to the mass ratio of 0.05: 0.95, setting the melting temperature to be 100 ℃, and uniformly mixing and melting in a high-speed mixer to prepare a spinning solution A;
(2) mixing Li7La3Zr2O12Grinding until the particle size is 200nm, the solid content is 15% of silica sol and polyethylene glycol to form a spinning solution B, wherein the mass ratio of the lithium compound to the silica sol to the polyethylene glycol is 12: 80: 8;
(3) adding the spinning solution A and the spinning solution B into a spinning channel, wherein the feeding mass ratio of the spinning solution A to the spinning solution B is 1:3, and carrying out coaxial spinning, wherein the coaxial spinning parameters are 30KV, the distance between positive and negative electrodes is 10cm, the spinning solution A is on the outer layer, the spinning solution B is on the inner layer, and the spinning is deposited on a roller which continuously rotates to obtain a felt-shaped fiber membrane;
(4) and (4) further pressing and shaping the felt-shaped fiber membrane obtained in the step (3) through a roller, and drying at 70 ℃ to obtain the power lithium battery fiber membrane solid electrolyte.
Comparative example 2 did not loosen the fiber membrane, affecting the interfacial properties.
And (3) performance testing:
1. conductivity test
For qualitative comparison, examples 1-4 and comparative examples 1-2 were tested for conductivity performance under equivalent conditions. The test method adopts an electrochemical impedance method, and comprises the following specific steps: the electrolyte membrane and the non-steel sheet are assembled into a sandwich-type blocking cell, and electrochemical impedance test is carried out at 25 ℃ in the frequency range of 1-10 MHz. Ionic conductivity σ = l/RS, where R is the bulk impedance measured by electrochemical impedance method; s is the contact area of the electrolyte and the stainless steel sheet, the test is repeated for 3 times, and the average value is calculated; as in table 1.
2. Mechanical properties:
the thickness of the solid electrolyte of the battery fiber membrane is controlled by a roller which continuously rotates, so that the thickness after pressing is 1mm, and the tensile test is carried out under the condition of 10mm/min by referring to GB1040-92 plastic tensile property test method. The equipment adopts an XLS electronic tension meter of Chengdu detection instrument company, 5 samples of each sample are tested, and the average value of the three middle values is taken. As shown in table 1.
Table 1:
Figure 211697DEST_PATH_IMAGE002

Claims (9)

1. the preparation method of the power lithium battery fiber membrane solid electrolyte is characterized by comprising the following steps:
(1) dispersing and melting the ionic liquid and the polymer to prepare spinning solution A;
(2) grinding the lithium compound to a nano level, and forming a spinning solution B by the lithium compound, the silicon dioxide sol and polyethylene glycol;
(3) adding the spinning solution A and the spinning solution B into a spinning channel, carrying out coaxial spinning, enabling the spinning solution A to be on the outer layer and the spinning solution B to be on the inner layer, spraying a lithium silicate aqueous solution on the surface of the outer layer through a nozzle, and carrying out spinning and depositing on a roller to obtain a felt-shaped fiber membrane;
(4) and (4) treating the felt-shaped fiber membrane obtained in the step (3) with weak acid liquid to enable lithium silicate on the surface to be gelatinized, and further pressing and drying to obtain the loose power lithium battery fiber membrane solid electrolyte with micropores on the surface.
2. The method of claim 1, wherein the ionic liquid is one of 1-ethyl-3-methylimidazole bistrifluoromethane sulfimide salt, 1-propyl-3-methylimidazole bistrifluoromethane sulfimide salt, 1-butyl-3-methylimidazole bistrifluoromethane sulfimide salt, N-methyl, propylpiperidine bistrifluoromethane sulfimide salt, N-methyl, butylpiperidine bistrifluoromethane sulfimide salt, N-methyl, propylpyrrolidine bistrifluoromethane sulfimide salt, N-methyl, butylpyrrolidine bistrifluoromethane sulfimide salt; the polymer is polyoxyethylene.
3. The method for preparing the fiber membrane solid electrolyte of the power lithium battery as claimed in claim 1, wherein the mass ratio of the ionic liquid to the polymer is (0.05-0.08) to (0.95-0.92), the melting temperature is set to be 100 ℃, and the spinning solution A is prepared by uniformly mixing and melting in a high-speed mixer.
4. The method of claim 1, wherein the lithium compound is Li7La3Zr2O12、Li1.3Al0.3Ti1.7(PO4)3、Li3PS4、Li9.6P3S12、Li7P3S11、Li11Si2PS12、Li10SiP2S12、Li10SnP2S12、Li10GeP2S12、 Li10Si0.5Ge0.5P2S12、Li10Ge0.5Sn0.5P2S12、Li10Si0.5Sn0.5P2S12、Li9.54Si1.74P1.44S11.7Cl0.3、Li6PS5Br、Li7PS6、Li7PS5I、Li7PO5Cl、Li3N、Li7PN4、LiSi2N3、LiPN2、Li2NH、Li3(NH2)2I、LiBH4、LiAlH4、LiNH2、Li2CdCl4The particle size of the lithium compound is 20-800 nm.
5. The method for preparing the power lithium battery fiber membrane solid electrolyte as claimed in claim 1, wherein the mass ratio of the lithium compound to the silica sol to the polyethylene glycol is (10-15): (77-88): (2-8), wherein the solid content of the silica sol is 10-20%.
6. The method as claimed in claim 1, wherein the modulus of the aqueous solution of lithium silicate in step (3) is 2.2-4.5.
7. The method for preparing the fiber membrane solid electrolyte of the power lithium battery as claimed in claim 1, wherein the coaxial spinning parameters in the step (3) are voltage of 12-30KV and positive-negative electrode spacing of 10-20 cm.
8. The method for preparing a fiber membrane solid electrolyte of a power lithium battery as claimed in claim 1, wherein the weak acid solution in step (4) is one of phosphoric acid and acetic acid with pH 4-6.
9. A power lithium battery fibrous membrane solid electrolyte, characterized by being prepared by the method of any one of claims 1 to 8.
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