CN114843598A - Solid electrolyte, preparation method and application thereof, and lithium ion battery - Google Patents

Solid electrolyte, preparation method and application thereof, and lithium ion battery Download PDF

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Publication number
CN114843598A
CN114843598A CN202210583711.0A CN202210583711A CN114843598A CN 114843598 A CN114843598 A CN 114843598A CN 202210583711 A CN202210583711 A CN 202210583711A CN 114843598 A CN114843598 A CN 114843598A
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lithium
electrolyte
cathode material
inorganic nanoparticles
lithium ion
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周兰
李旺
廖文俊
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Shanghai Electric Group Corp
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Shanghai Electric Group Corp
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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • H01M2300/0085—Immobilising or gelification of electrolyte
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Dispersion Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a solid electrolyte, a preparation method and application thereof, and a lithium ion battery. The solid electrolyte comprises an electrolyte matrix, a lithium-containing cathode material and inorganic nanoparticles; the inorganic nano-particles are one or more of aluminum-based silicate, magnesium-based silicate, kaolin, montmorillonite and chlorite. The solid electrolyte has high ionic conductivity, low crystallinity, high safety and wide application prospect. The solid electrolyte is used for the lithium ion battery, so that the interface side reaction between the solid electrolyte and the cathode and the anode of the battery can be optimized, and the safety of the lithium ion battery can be greatly improved on the basis of not losing energy density.

Description

Solid electrolyte, preparation method and application thereof, and lithium ion battery
Technical Field
The invention particularly relates to a solid electrolyte, a preparation method and application thereof, and a lithium ion battery.
Background
Lithium ion battery technology has been applied to portable electronic devices for many years. In recent years, lithium ion batteries have been used in transportation systems such as hybrid and electric vehicles. These markets present different challenges in cell design, the former requiring generally higher power densities, and the latter requiring higher energy densities to accommodate the higher levels of range required for vehicle travel. Based on this, the need for rate capability of the battery as well as conductivity and diffusivity inside the battery is apparent for both markets.
Since the liquid electrolyte has fluidity, the contact between the electrolyte and the positive and negative electrode materials is very desirable, and the conventional liquid electrolyte can provide satisfactory performance. However, with the continuous maturation of lithium battery technology, the performance of the positive and negative electrode interfaces of the lithium ion battery is continuously improved, so that the application of the lithium battery is prosperous and developed, especially in recent years, with the concern of people on safety and mileage anxiety, a novel lithium battery is widely concerned, wherein the gel electrolyte is concerned, and the development of the novel battery is possible because the gel electrolyte has certain fluidity. In the process of assembling the battery, a diaphragm for isolating the positive electrode and the negative electrode is removed, so that the positive electrode and the negative electrode are in direct contact with the gel electrolyte, however, the gel electrolyte has poor fluidity, so that larger interface impedance can be generated, and the volume change of the positive electrode and the negative electrode in the charging and discharging process can further cause the problem of electrode-electrolyte interface side reaction. This requires good interfacial reaction between the gel electrolyte and the positive and negative electrodes and places higher demands on the volume change that can accommodate the electrodes during charging and discharging of the battery.
In general, a lithium ion battery does not have problems in normal use, but the lithium ion battery is a monomer with energy and has very high energy density, and chemical reactions in the lithium ion battery are carried out all the time. The disadvantages of lithium batteries are amplified when they are subjected to deformation or irregular electrochemical operation. On the one hand, electrolyte among the lithium cell belongs to inflammable type material, and it participates in chemical reaction and not only can release harmful gas, moreover because its flash point is not high, burns on fire easily at the in-process electrolyte that the temperature is constantly risen, and to the lithium cell, the combustion process is very rapid, and the lithium cell can constantly release oxygen and energy during this period, this reaction process of aggravation. Therefore, the conventional liquid battery with an electrolyte is very dangerous in practice.
In addition, the lithium ion conducting medium in the conventional lithium battery is an organic electrolyte, however, the organic electrolyte has the biggest problem of easily releasing organic gas and starting to burn when reaching the flash point temperature, which is one of the biggest bottleneck problems of the lithium battery in combustion and explosion, and the problem is continuously and deeply researched. The development of a high-safety solid electrolyte has become a necessary approach for the development of next-generation lithium batteries because the solid battery, which does not emit organic gases at high temperatures because the electrolyte is solid, does not burn at high temperatures.
Disclosure of Invention
The invention aims to solve the technical problems that in the prior art, a liquid electrolyte is easy to release organic gas and is inflammable, so that a battery is easy to burn and explode, the interface impedance of a gel electrolyte is high, and the electrode-electrolyte has interface side reactions in the charging and discharging processes, and provides a solid electrolyte, a preparation method and application thereof, and a lithium ion battery. The solid electrolyte has high ionic conductivity, low crystallinity, high safety and wide application prospect. The solid electrolyte is used for the lithium ion battery, so that the interface side reaction between the solid electrolyte and the cathode and the anode of the battery can be optimized, and the safety of the lithium ion battery can be greatly improved on the basis of not losing energy density.
The present invention provides the following technical solutions to solve the above technical problems.
The invention provides a solid electrolyte, which comprises an electrolyte matrix, a lithium-containing cathode material and inorganic nanoparticles;
wherein the inorganic nanoparticles are one or more of aluminum-based silicate, magnesium-based silicate, kaolin, montmorillonite and chlorite.
In the present invention, the inorganic nanoparticles are preferably kaolin (Al) 2 O 3 ·2SiO 2 )。
In the present invention, the inorganic nanoparticles are preferably compounds and/or mixtures of nanosilicate particles.
In the present invention, the content of the inorganic nanoparticles may be 0.05 wt.% to 70 wt.%, preferably 0.1 wt.% to 50 wt.%, more preferably 1 wt.% to 30 wt.%, which is the weight percentage of the content of the inorganic nanoparticles to the total weight of the solid electrolyte.
In the present invention, the lithium-containing cathode material is one or more of a lithium-containing phosphate, a lithium-containing oxide, and a manganese-containing lithium oxide.
In the present invention, the lithium-containing cathode material is preferably lithium iron phosphate.
In the present invention, the content of the lithium-containing cathode material may be 0.5 wt.% to 10 wt.%, preferably 0.5 wt.% to 2 wt.%, which is the mass percentage of the content of the lithium-containing cathode material to the total weight of the solid electrolyte.
In the present invention, the electrolyte matrix may be one or more of polyethylene oxide polymer, polypropylene oxide, methyl methacrylate, polycarbonate, polysiloxane, polyvinyl alcohol, and polystyrene monomer polymer, preferably polyethylene oxide.
In the present invention, the content ratio of the electrolyte matrix to the lithium-containing cathode material may be (8 to 120): 1, e.g. 10: 0.15, 10: 0.2 or 10: 0.75.
in the invention, the content ratio of the electrolyte matrix to the inorganic nanoparticles can be (5-24): 1, e.g. 5.5: 1. 10: 1. 15: 1 or 20: 1.
in the present invention, the contents of the electrolyte matrix, the lithium-containing cathode material, and the inorganic nanoparticles are preferably 10: 0.75: 1. 10: 0.15: 1 or 10: 0.2: 1.
in the present invention, the solid electrolyte preferably further includes a lithium ion conductive salt.
Wherein the lithium ion conducting salt can be a lithium ion conducting salt conventional in the art, such as lithium diimine (LiTFSI), lithium bistrifluoromethylsulfonyl imide (LiTFSI), lithium bisfluorosulfonyl imide (LiFSI), or lithium difluorooxalato borate (litdfob), preferably lithium diimine (LiTFSI).
Wherein, the content of the lithium ion conducting salt can be the content conventional in the field.
The invention also provides a preparation method of the solid electrolyte,
when the solid electrolyte contains an electrolyte matrix, a lithium-containing cathode material and inorganic nanoparticles, the preparation steps comprise: transferring the mixed solution containing the electrolyte matrix, the lithium-containing cathode material and the inorganic nanoparticles onto a template, and drying;
when the solid electrolyte contains an electrolyte matrix, a lithium-containing cathode material, inorganic nanoparticles and a lithium ion conducting salt, the preparation steps comprise: transferring the mixed solution containing the electrolyte matrix, the lithium-containing cathode material, the inorganic nanoparticles and the lithium ion conducting salt solution onto a template, and drying;
wherein:
the electrolyte matrix is as described above;
the lithium-containing cathode material is as previously described;
the inorganic nanoparticles are as described previously;
the lithium ion conducting salt is as described above.
In the present invention, the micro-morphology of the inorganic nanoparticles may be one or more of nanotubes, nanopores and nanosheets.
In the present invention, the form of the lithium-containing cathode material may be conventional in the art, and is preferably a powder.
In the present invention, the solvent of the mixed solution may be a solvent conventional in the art, such as an inorganic solvent and/or an organic solvent, preferably an organic solvent, such as acetonitrile.
In the present invention, the concentration of the lithium ion salt solution may be 0.8 to 1.2mol/L, preferably 0.8 to 1mol/L, for example 1 mol/L.
In the present invention, the solvent of the lithium ion conducting salt solution may be a solvent conventional in the art, such as one or more of Ethylene Carbonate (EC), Propylene Carbonate (PC), ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, sulfolane, 2-methyltetrahydrofuran and 1, 3-dioxolane, preferably Ethylene Carbonate (EC) and Propylene Carbonate (PC).
When the solvent of the lithium ion conducting salt solution is Ethylene Carbonate (EC) and Propylene Carbonate (PC), the volume ratio of the Ethylene Carbonate (EC) to the Propylene Carbonate (PC) may be 1 to 3, for example 2.3 or 2.5.
In the present invention, the manner of preparing the mixed solution may be a conventional manner in the art, and is generally stirring.
In the present invention, the preparation of the mixed solution is preferably carried out under heating.
Wherein the heating temperature may be 70 ℃ to 90 ℃, for example 80 ℃.
The heating time may be 6-10h, for example 8 h.
In the present invention, the means for transferring to the template may be a conventional means in the art, for example, casting the mixed solution onto the template.
In the present invention, the material of the template may be conventional in the art, such as polytetrafluoroethylene.
In the present invention, the drying method may be a conventional method in the art, for example, a vacuum drying method. The drying temperature may be a drying temperature conventional in the art, for example, 60 ℃ to 100 ℃, preferably 80 ℃. The drying time may be conventional in the art, for example 6h to 10h, preferably 8 h.
The invention also provides the solid electrolyte prepared by the preparation method of the solid electrolyte.
The invention also provides a lithium ion battery which comprises the solid electrolyte, the positive electrode active material and the negative electrode active material.
In the present invention, the positive active material (also referred to as an active cathode material) may be any active material conventional in the art, for example, LiCoO 2 、LiFePO 4 Lithium nickel cobalt manganese oxide (NCM), lithium nickel cobalt aluminum oxide (NCA), high energy NCM (HE-NCM), lithium iron phosphate, lithium manganese spinel (LiMn) 2 O 4 ) One or more of free lithium transition metal oxide (also referred to as lithium metal oxide), layered oxide, spinel, olivine compound, silicate compound and mixture of silicate compounds, preferably LiFePO 4 。
In the present invention, the anode active material may be any active material conventional in the art, for example, one or more of a metal oxide, a metal alloy, a metal simple substance, and a carbonaceous material, and is preferably a metal alloy or a metal simple substance.
Wherein the metal oxide is typically lithium metal oxide or lithium titanium oxide.
The metal alloy is generally an alloy of metallic tin or an alloy of metallic lithium, preferably an alloy of metallic lithium.
The elemental metal is preferably elemental lithium, such as a Li plate.
The carbonaceous material is typically one or more of graphite, graphene, intermediate carbon, doped carbon, hard carbon, soft carbon, fullerenes, and mixtures of silicon and carbon. The graphite is typically synthetic graphite and/or natural graphite.
The invention also provides an application of the solid electrolyte in the preparation of the lithium ion battery.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The reagents and starting materials used in the present invention are commercially available.
The positive progress effects of the invention are as follows:
(1) the solid electrolyte prepared by the method has the advantages of higher ionic conductivity, low crystallinity and high safety.
(2) The solid electrolyte prepared by the invention is used for the lithium ion battery, the interface side reaction between the solid electrolyte and the cathode and the anode of the battery can be optimized, and the safety of the lithium ion battery can be greatly improved on the basis of not losing energy density.
(3) The solid electrolyte can be applied to the fields of high-energy-density batteries and electric automobiles, and has wide application prospect.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
Each of the starting reagents in the following examples is commercially available.
Example 1
1g of kaolin (Al) 2 O 3 ·2SiO 2 ) Dispersing nano particles, 10g of polyethylene oxide and 0.75g of lithium iron phosphate powder in 50ml of acetonitrile solvent, and adding 1mol/LLITFSI + EC + PC (V) after the solution is uniformly stirred EC :V PC 7:3) (wherein, diimine Lithium (LiTFSI) is a lithium ion conducting salt, Ethylene Carbonate (EC) and Propylene Carbonate (PC) are solvents, (wherein, LiTFSI is a lithium ion conducting salt, EC and PC are solvents, the addition amount of the solvents is determined according to the state of the solution, and finally the solution is prepared into a film-forming state). After heating at high temperature (80 ℃ C.) and stirring for 8 hours, a mixed solution was obtained. And casting the mixed solution onto a polytetrafluoroethylene template, quickly transferring the polytetrafluoroethylene template into a vacuum drying oven, drying the polytetrafluoroethylene template for 8 hours at the temperature of 80 ℃ to obtain a composite solid electrolyte, taking out the composite solid electrolyte, and cutting the composite solid electrolyte into a wafer with the diameter of 18 mm. LiFePO is selected 4 And the Li sheet is used as a positive electrode and a negative electrode to manufacture the CR2032 button cell by adopting a conventional method in the field, and the cell is sealed and compressed.
Example 2
1g of kaolin (Al) 2 O 3 ·2SiO 2 ) Dispersing nano particles, 10g of polyethylene oxide and 0.15g of lithium iron phosphate powder in 50ml of acetonitrile solvent, and adding 1mol/LLITFSI + EC + PC (V) after the solution is uniformly stirred EC :V PC 7:3) (where LiTFSI is a lithium ion conductive salt, EC and PC are solvents, the amount of the solvent to be added is determined according to the state of the solution, and finally the solution is prepared into a film-forming state). After heating at high temperature (80 ℃ C.) and stirring for 8 hours, a mixed solution was obtained. And casting the mixed solution onto a polytetrafluoroethylene template, quickly transferring the polytetrafluoroethylene template into a vacuum drying oven, drying the polytetrafluoroethylene template for 8 hours at the temperature of 80 ℃ to obtain a composite solid electrolyte, taking out the composite solid electrolyte, and cutting the composite solid electrolyte into a wafer with the diameter of 18 mm. LiFePO is selected 4 And (3) taking the Li sheet as a positive electrode and a negative electrode to manufacture a CR2032 button battery, sealing and compacting.
Example 3
1g of kaolin (Al) 2 O 3 ·2SiO 2 ) Dispersing nano particles, 10g of polyethylene oxide and 0.2g of lithium iron phosphate powder in 50ml of acetonitrile solvent, and adding 1mol/L of LiTFSI + EC + PC (V) after the solution is uniformly stirred EC :V PC 7:3) (where LiTFSI is a lithium ion conductive salt, EC and PC are solvents, the amount of the solvent to be added is determined according to the state of the solution, and the solution is finally prepared into a film-forming state). After heating at high temperature (80 ℃ C.) and stirring for 8 hours, a mixed solution was obtained. And casting the mixed solution onto a polytetrafluoroethylene template, quickly transferring the polytetrafluoroethylene template into a vacuum drying oven, drying the polytetrafluoroethylene template for 8 hours at the temperature of 80 ℃ to obtain a composite solid electrolyte, taking out the composite solid electrolyte, and cutting the composite solid electrolyte into a wafer with the diameter of 18 mm. LiFePO is selected 4 And (3) taking the Li sheet as a positive electrode and a negative electrode to manufacture a CR2032 button battery, sealing and compacting.
Comparative example 1
Reference is made to the preparation of example 4 of patent CN105591154A, which made an all-solid polymer electrolyte, using the same LiFePO as in example 1 4 And (3) taking the Li sheet as a positive electrode and a negative electrode to manufacture a CR2032 button battery, sealing and compacting.
Effects of the embodiment
(1) Electrolyte ionic conductivity test
Test objects: the solid electrolytes prepared in examples 1 to 3, the liquid electrolyte of comparative example 1, and the gel electrolyte of comparative example 2.
The test equipment and methods are conventional in the art.
(2) Electrolyte crystallinity test
Test objects: the solid electrolytes prepared in examples 1 to 3, the liquid electrolyte of comparative example 1, and the gel electrolyte of comparative example 2.
The test equipment and methods are conventional in the art.
(3) Lithium ion battery energy density testing
Test objects: examples 1-3, comparative example 1.
The test equipment and methods are conventional in the art.
It is understood from the test data of comparative examples 1 to 3 and comparative example 1 that the solid electrolytes prepared in examples 1 to 3 have high ionic conductivity and low crystallinity, and the solid electrolytes prepared in examples 1 to 3 can be used in lithium ion batteries with high safety without loss of energy density.

Claims (10)

1. A solid-state electrolyte comprising an electrolyte matrix, a lithium-containing cathode material, and inorganic nanoparticles;
the inorganic nano-particles are one or more of aluminum-based silicate, magnesium-based silicate, kaolin, montmorillonite and chlorite.
2. The solid electrolyte of claim 1,
the content of the inorganic nanoparticles is 0.05 wt.% to 70 wt.%, preferably 0.1 wt.% to 50 wt.%, more preferably 1 wt.% to 30 wt.%, and the percentage is the weight percentage of the content of the inorganic nanoparticles to the total weight of the solid electrolyte;
and/or the lithium-containing cathode material is one or more of lithium-containing phosphate, lithium-containing oxide and manganese-containing lithium oxide;
and/or the lithium-containing cathode material is present in an amount of 0.5-10 wt.%, preferably 0.5-2 wt.%, the percentage being the mass percentage of the lithium-containing cathode material based on the total weight of the solid-state electrolyte;
and/or the electrolyte matrix is one or more of polyethylene oxide polymer, polypropylene oxide, methyl methacrylate, polycarbonate, polysiloxane, polyvinyl alcohol and polystyrene monomer polymer, preferably polyethylene oxide;
and/or the content ratio of the electrolyte matrix to the lithium-containing cathode material is (8-120): 1, e.g. 10: 0.15, 10: 0.2 or 10: 0.75;
and/or the content ratio of the electrolyte matrix to the inorganic nanoparticles is (5-24): 1, e.g. 5.5: 1. 10: 1. 15: 1 or 20: 1;
and/or, the solid electrolyte further comprises a lithium ion conducting salt.
3. The solid state electrolyte of claim 2, wherein the inorganic nanoparticles are kaolin;
and/or the inorganic nanoparticles are compounds and/or mixtures of nanosilicate particles;
and/or the lithium-containing cathode material is lithium iron phosphate;
and/or the dosage ratio of the electrolyte matrix, the lithium-containing cathode material and the inorganic nanoparticles is 10: 0.75: 1. 10: 0.15: 1 or 10: 0.2: 1;
and/or the lithium ion conducting salt is diimine lithium, bis (trifluoromethyl) sulfonyl imide lithium, bis (fluoro) sulfonyl imide lithium or lithium difluoro oxalate borate, preferably diimine lithium.
4. A method for preparing a solid electrolyte is characterized in that,
when the solid electrolyte contains an electrolyte matrix, a lithium-containing cathode material and inorganic nanoparticles, the preparation steps comprise: transferring the mixed solution containing the electrolyte matrix, the lithium-containing cathode material and the inorganic nanoparticles onto a template, and drying;
when the solid electrolyte contains an electrolyte matrix, a lithium-containing cathode material, inorganic nanoparticles and a lithium ion conducting salt, the preparation steps comprise: transferring a mixed solution containing the electrolyte matrix, the lithium-containing cathode material, the inorganic nanoparticles and the lithium ion conducting salt solution onto a template, and drying;
wherein:
the electrolyte matrix is the electrolyte matrix according to any one of claims 1 to 3;
the lithium-containing cathode material is the lithium-containing cathode material of any one of claims 1-3;
the inorganic nanoparticles are the inorganic nanoparticles of any one of claims 1-3;
the lithium ion conducting salt is the lithium ion conducting salt as claimed in claim 2 or 3.
5. The method of claim 4, wherein the inorganic nanoparticles have a micro-morphology that is one or more of nanotubes, nanopores, and nanoplates;
and/or, the lithium-containing cathode material is in the form of a powder;
and/or, the solvent of the mixed solution is an inorganic solvent and/or an organic solvent, preferably an organic solvent, such as acetonitrile;
and/or the concentration of the lithium ion guiding salt solution is 0.8-1.2mol/L, preferably 0.8-1mol/L, such as 1 mol/L;
and/or, the solvent of the lithium ion conducting salt solution is one or more of ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, sulfolane, 2-methyltetrahydrofuran and 1, 3-dioxolane, preferably ethylene carbonate and propylene carbonate;
when the solvent of the lithium ion conducting salt solution is ethylene carbonate and propylene carbonate, the volume ratio of the ethylene carbonate to the propylene carbonate is 1-3, such as 2.3 or 2.5.
6. The method of producing a solid electrolyte according to claim 4, wherein the manner of producing the mixed solution is stirring;
and/or the mode of transferring to the template is casting;
and/or the template is made of polytetrafluoroethylene;
preferably, the preparation of the mixed solution is carried out under heating;
more preferably, the temperature of the heating is from 70 ℃ to 90 ℃, e.g., 80 ℃;
more preferably, the heating time is 6-10h, such as 8 h;
and/or, the drying mode is vacuum drying;
and/or the temperature of the drying is 60-100 ℃, preferably 80 ℃;
and/or the drying time is 6h-10h, preferably 8 h.
7. A solid electrolyte obtained by the method for producing a solid electrolyte according to any one of claims 4 to 6.
8. A lithium ion battery comprising the solid-state electrolyte of any one of claims 1-3, or the solid-state electrolyte, positive electrode active material, and negative electrode active material of claim 7.
9. The lithium ion battery of claim 8, wherein the positive electrode active material is LiCoO 2 、LiFePO 4 One or more of lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, high energy NCM, lithium iron phosphate, lithium manganese spinel, free lithium transition metal oxide, layered oxide, spinel, olivine compound and silicate compound and mixtures thereof, preferably LiFePO 4 ；
And/or the negative active material is one or more of metal oxide, metal alloy, metal simple substance and carbonaceous material, preferably metal alloy or metal simple substance;
preferably, the metal oxide is lithium metal oxide or lithium titanium oxide;
preferably, the metal alloy is an alloy of metallic tin or an alloy of metallic lithium, preferably an alloy of metallic lithium;
preferably, the elemental metal is elemental lithium, such as a Li sheet;
preferably, the carbonaceous material is one or more of graphite, graphene, intermediate carbon, doped carbon, hard carbon, soft carbon, fullerene and a mixture of silicon and carbon;
more preferably, the graphite is synthetic graphite and/or natural graphite.
10. Use of a solid-state electrolyte according to any one of claims 1 to 3, or of a solid-state electrolyte according to claim 7, for the preparation of a lithium-ion battery.
CN202210583711.0A 2022-05-25 2022-05-25 Solid electrolyte, preparation method and application thereof, and lithium ion battery Pending CN114843598A (en)

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