CN113629291A - Polyalkylene oxide all-solid-state electrolyte, preparation method thereof and lithium ion battery - Google Patents

Polyalkylene oxide all-solid-state electrolyte, preparation method thereof and lithium ion battery Download PDF

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CN113629291A
CN113629291A CN202010382277.0A CN202010382277A CN113629291A CN 113629291 A CN113629291 A CN 113629291A CN 202010382277 A CN202010382277 A CN 202010382277A CN 113629291 A CN113629291 A CN 113629291A
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polyalkylene oxide
solid
lithium
electrolyte
mixed solution
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CN113629291B (en
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张师军
张恒源
刘建叶
祁丽亚
初立秋
徐耀辉
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Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
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China Petroleum and Chemical 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
    • H01M2300/00—Electrolytes
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Abstract

The invention belongs to the field of polymer all-solid-state electrolytes, and relates to a polyalkylene oxide all-solid-state electrolyte, a preparation method thereof and a lithium ion battery. The polyalkylene oxide all-solid-state electrolyte comprises polyalkylene oxide, inorganic ceramic fast ion conductor filler and lithium salt, wherein the inorganic ceramic fast ion conductor filler is formed by Li6.4La3Zr1.4Ta0.6O12And Li1.5Al0.5Ge1.5(PO4)3And (4) forming. The invention is beneficial to forming a rapid lithium ion channel through the synergistic effect of different types of inorganic ceramic rapid ion conductor fillers, thereby improving the conductivity of the electrolyte.

Description

Polyalkylene oxide all-solid-state electrolyte, preparation method thereof and lithium ion battery
Technical Field
The invention belongs to the field of polymer all-solid-state electrolytes, and particularly relates to a polyalkylene oxide all-solid-state electrolyte, a preparation method of the polyalkylene oxide all-solid-state electrolyte, and a lithium ion battery.
Background
The lithium ion battery is considered to be a promising energy storage element due to the advantages of high energy density, good cycle performance and the like. The liquid electrolyte developed to be mature at present has the disadvantages of low transference number of lithium ions, flammability, easy liquid leakage, and incapability of using metal lithium as a negative electrode electrolyte, and limits the further development of lithium ion batteries, so researchers have turned their attention to solid electrolytes.
The polymer solid electrolyte has advantages of low cost, high safety, and easy processing, and thus has received much attention, however, it has low ionic conductivity compared to a liquid electrolyte, and is difficult to be applied on a large scale at present.
The inorganic solid electrolyte has conductivity close to that of a liquid electrolyte at normal temperature, but is difficult to directly contact with the anode and the cathode, and has poor mechanical properties. In order to comprehensively improve the performance of the lithium ion battery, researchers try to compound a polymer electrolyte and an inorganic solid electrolyte, and can combine the advantages of the polymer electrolyte and the inorganic solid electrolyte. However, the conductivity of the electrolyte obtained by the current composite scheme is still not as satisfactory.
Disclosure of Invention
The invention aims to provide a polyalkylene oxide all-solid-state electrolyte added with two inorganic ceramic fast ion conductor fillers, a preparation method thereof and a lithium ion battery, wherein the polyalkylene oxide all-solid-state electrolyte has higher conductivity.
A first aspect of the present invention provides a polyalkylene oxide all-solid-state electrolyte comprisingPolyalkylene oxide, inorganic ceramic fast ion conductor filler and lithium salt, wherein the inorganic ceramic fast ion conductor filler is formed by Li6.4La3Zr1.4Ta0.6O12And Li1.5Al0.5Ge1.5(PO4)3And (4) forming.
A second aspect of the present invention provides the above-mentioned method for preparing a polyalkylene oxide all-solid-state electrolyte, comprising the steps of:
1) mixing the polyalkylene oxide and the lithium salt with an organic solvent to obtain a mixed solution;
2) adding the inorganic ceramic fast ion conductor filler into the mixed solution to form a suspension;
3) and drying the suspension to obtain the polyalkylene oxide all-solid-state electrolyte.
The third aspect of the invention provides a lithium ion battery, which comprises a positive electrode, a negative electrode and an electrolyte, wherein the electrolyte is the above-mentioned polyalkylene oxide all-solid-state electrolyte.
The invention has the following advantages:
1. the polyalkylene oxide all-solid-state electrolyte is added with two inorganic ceramic fast ion conductor fillers, and a fast lithium ion channel is favorably formed through the synergistic effect of the inorganic ceramic fast ion conductor fillers of different types, so that the conductivity of the electrolyte is improved.
2. Compared with a liquid electrolyte or a mixed electrolyte, the polyalkylene oxide all-solid-state electrolyte has good safety and is not flammable.
3. The method for preparing the full-solid electrolyte of the polyalkylene oxide is simple and easy to implement, and the raw materials are easy to obtain, thereby being beneficial to popularization.
4. The base material used by the solid electrolyte is polyalkylene oxide which has crystallinity and good mechanical property.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
Exemplary embodiments of the present invention will be described in more detail by referring to the accompanying drawings.
FIG. 1 is a graph comparing the conductivities of the polyalkylene oxide all-solid electrolytes of examples 1-2, 5-6 and comparative examples 1-5 at 25 ℃.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The first aspect of the present invention provides a polyalkylene oxide all-solid-state electrolyte comprising a polyalkylene oxide, an inorganic ceramic fast ion conductor filler composed of Li, and a lithium salt6.4La3Zr1.4Ta0.6O12And Li1.5Al0.5Ge1.5(PO4)3And (4) forming.
According to the invention, preferably, Li6.4La3Zr1.4Ta0.6O12And Li1.5Al0.5Ge1.5(PO4)3In a weight ratio of 0.25-4: 1, preferably 0.3 to 3: 1, more preferably 0.5 to 2: 1. the polyalkylene oxide all-solid-state electrolyte with the two inorganic ceramic fast ion conductor fillers in the preferable compounding ratio has higher conductivity.
In the present invention, as in the conventional use state, the Li6.4La3Zr1.4Ta0.6O12And said Li1.5Al0.5Ge1.5(PO4)3Are all nano-scale. Both inorganic ceramic fast ion conductor fillers are commercially available or are prepared by methods well known in the art.
According to a preferred embodiment of the present invention, the weight content of the polyalkylene oxide is 35 to 90%, preferably 40 to 80%, and more preferably 50 to 70%, based on the total weight of the polyalkylene oxide all-solid-state electrolyte; the weight content of the inorganic ceramic fast ion conductor filler is 0.5-50%, preferably 2-40%, and more preferably 5-20%; the content by weight of the lithium salt is 9 to 50%, preferably 18 to 50%, and more preferably 25 to 40%.
According to the present invention, the polyalkylene oxide as the base material is preferably a polyalkylene oxide, more preferably a polyethylene oxide and/or a polypropylene oxide. In the invention, the lower alkane refers to alkane with 2-4 carbon atoms.
In the polyalkylene oxide all-solid-state electrolyte, the lithium salt can be various lithium salts conventionally adopted in the field of solid-state electrolytes, including but not limited to one or more of lithium bis (trifluoromethylsulfonate) imide, lithium hexafluorophosphate, lithium bis (fluorosulfonyl) imide, lithium perchlorate, lithium tetrafluorophosphate, lithium difluorophosphate, lithium bis (oxalato) borate and lithium difluorooxalato borate; lithium hexafluorophosphate and/or lithium bistrifluoromethylsulfonate are preferred.
When used according to the present invention, the polyalkylene oxide all-solid electrolyte is usually in the form of a film, and the thickness of the film may be determined as desired, for example, from 60 to 200 μm.
A second aspect of the present invention provides the above-mentioned method for preparing a polyalkylene oxide all-solid-state electrolyte, comprising the steps of:
1) mixing the polyalkylene oxide and the lithium salt with an organic solvent to obtain a mixed solution;
2) adding the inorganic ceramic fast ion conductor filler into the mixed solution to form a suspension;
3) and drying the suspension to obtain the polyalkylene oxide all-solid-state electrolyte.
According to a preferred embodiment of the present invention, step 3) comprises:
3-1) coating the suspension on a mould by using a solution casting method to form a liquid film;
3-2) carrying out vacuum drying on the liquid film to obtain the polyalkylene oxide all-solid-state electrolyte.
In step 3-1), the mold may be a mold made of various materials conventionally used in the art, such as a teflon mold.
The polyalkylene oxide all-solid electrolyte prepared by the above method is in the form of a film.
In the preparation method of the polyalkylene oxide all-solid-state electrolyte, specifically, in the step 1), the mass concentration of the solute in the mixed solution is 10-40%. The organic solvent used in step 1) may be one or more of N, N-dimethylformamide, N-dimethylacetamide, acetonitrile and acetone, preferably acetonitrile and/or N, N-dimethylformamide, and more preferably acetonitrile.
Preferably, step 1) comprises: and mixing the polyalkylene oxide and the lithium salt with an organic solvent, and fully stirring to completely dissolve the polyalkylene oxide and the lithium salt to obtain a mixed solution. Wherein the stirring is preferably carried out at 40 ℃ to 75 ℃; the stirring time can be 6-12 h.
According to an embodiment of the present invention, step 2) includes: and adding the inorganic ceramic fast ion conductor filler into the mixed solution, performing ultrasonic dispersion, and uniformly stirring to form a suspension. The stirring is preferably carried out at 40 ℃ to 75 ℃; the stirring time can be 8-12 h. The ultrasonic dispersion can adopt the conventional process conditions and equipment in the field, and the time can be 10min to 20 min.
According to the present invention, the vacuum drying may also be carried out under conventional conditions, specifically, at a temperature of 25 to 80 ℃ for 12 to 48 hours.
The third aspect of the invention provides a lithium ion battery, which comprises a positive electrode, a negative electrode and an electrolyte, wherein the electrolyte is the above-mentioned polyalkylene oxide all-solid-state electrolyte.
The present invention will be further described with reference to the following examples, but the scope of the present invention is not limited to these examples.
Example 1
3g of polyethylene oxide, 20g of acetonitrile and 2.1g of lithium bistrifluoromethylsulfonate imide were put into a 100mL flask, stirred at 40 ℃ for 8 hours to obtain a uniform solution, and 0.15g of Li was added6.4La3Zr1.4Ta0.6O12And 0.15g Li1.5Al0.5Ge1.5(PO4)3Adding into the above solution, ultrasonic dispersing for 10min, stirring at 70 deg.C for 12 hr to obtain uniform mixed solution, casting the mixed solution on polytetrafluoroethylene mold, and vacuum-drying at 50 deg.CAnd drying in an oven for 24 hours to obtain the polyethylene oxide all-solid-state electrolyte. The polyalkylene oxide all-solid electrolyte was in the form of a film, and the thickness of the film was 70 μm.
Example 2
5g of polyethylene oxide, 35g N, N-dimethylformamide and 3g of lithium bistrifluoromethylsulfonate were put into a 250mL flask, stirred at 50 ℃ for 10 hours to obtain a uniform solution, and 0.6g of Li was added6.4La3Zr1.4Ta0.6O12And 0.4g of Li1.5Al0.5Ge1.5(PO4)3Adding the mixed solution into the solution, performing ultrasonic dispersion for 20min, stirring for 16h at 80 ℃ to obtain a uniform mixed solution, casting the mixed solution on a polytetrafluoroethylene mold, and drying in a vacuum oven at 80 ℃ for 24h to obtain the polyethylene oxide all-solid-state electrolyte. The polyalkylene oxide all-solid electrolyte is in the form of a membrane, and the thickness of the membrane is 100 μm.
Example 3
2g of polyethylene oxide, 15g N, N-dimethylacetamide and 1g of lithium bis (fluorosulfonyl) imide were put into a 100mL flask, and stirred at 40 ℃ for 6 hours to obtain a uniform solution, and 0.24g of Li was added6.4La3Zr1.4Ta0.6O12And 0.06g Li1.5Al0.5Ge1.5(PO4)3Adding the mixed solution into the solution, performing ultrasonic dispersion for 10min, stirring for 8h at 50 ℃ to obtain a uniform mixed solution, casting the mixed solution on a polytetrafluoroethylene mold, and drying in a vacuum oven at 70 ℃ for 24h to obtain the polyethylene oxide all-solid-state electrolyte. The polyalkylene oxide all-solid electrolyte was in the form of a film having a thickness of 140 μm.
Example 4
Adding 4g of polyethylene oxide, 30g of acetone and 1.6g of lithium bis (fluorosulfonyl) imide into a 250mL flask, stirring at 70 ℃ for 7 hours to obtain a uniform solution, and adding 0.1g of Li6.4La3Zr1.4Ta0.6O12And 0.2g of Li1.5Al0.5Ge1.5(PO4)3Adding into the above solution, ultrasonic dispersing for 20min, stirring at 70 deg.C for 12 hrAnd casting the mixed solution on a polytetrafluoroethylene mold, and drying in a vacuum oven at 80 ℃ for 24 hours to obtain the polyethylene oxide all-solid-state electrolyte. The polyalkylene oxide all-solid electrolyte was in the form of a film having a thickness of 160 μm.
Example 5
5g of polyethylene oxide, 35g N, N-dimethylformamide and 3g of lithium bistrifluoromethylsulfonate were put into a 250mL flask, and stirred at 50 ℃ for 10 hours to obtain a uniform solution, and 0.8g of Li was added6.4La3Zr1.4Ta0.6O12And 0.2g of Li1.5Al0.5Ge1.5(PO4)3Adding the mixed solution into the solution, performing ultrasonic dispersion for 20min, stirring for 16h at 80 ℃ to obtain a uniform mixed solution, casting the mixed solution on a polytetrafluoroethylene mold, and drying in a vacuum oven at 80 ℃ for 24h to obtain the polyethylene oxide all-solid-state electrolyte. The polyalkylene oxide all-solid electrolyte is in the form of a membrane, and the thickness of the membrane is 100 μm.
Example 6
5g of polyethylene oxide, 35g N, N-dimethylformamide and 3g of lithium bistrifluoromethylsulfonate were put into a 250mL flask, stirred at 50 ℃ for 10 hours to obtain a uniform solution, and 0.3g of Li was added6.4La3Zr1.4Ta0.6O12And 0.7g of Li1.5Al0.5Ge1.5(PO4)3Adding the mixed solution into the solution, performing ultrasonic dispersion for 20min, stirring for 16h at 80 ℃ to obtain a uniform mixed solution, casting the mixed solution on a polytetrafluoroethylene mold, and drying in a vacuum oven at 80 ℃ for 24h to obtain the polyethylene oxide all-solid-state electrolyte. The polyalkylene oxide all-solid electrolyte is in the form of a membrane, and the thickness of the membrane is 100 μm.
Example 7
5g of polypropylene oxide, 35g N, N-dimethylformamide and 3g of lithium bistrifluoromethylsulfonate were put into a 250mL flask, stirred at 50 ℃ for 10 hours to obtain a uniform solution, and 0.6g of Li was added6.4La3Zr1.4Ta0.6O12And 0.4g of Li1.5Al0.5Ge1.5(PO4)3Adding the mixed solution into the solution, performing ultrasonic dispersion for 20min, stirring for 16h at 80 ℃ to obtain a uniform mixed solution, casting the mixed solution on a polytetrafluoroethylene mold, and drying in a vacuum oven at 80 ℃ for 24h to obtain the polyethylene oxide all-solid-state electrolyte. The polyalkylene oxide all-solid electrolyte was in the form of a film, and the thickness of the film was 190. mu.m.
Example 8
3g of polyethylene oxide, 20g of acetonitrile and 2.1g of lithium bistrifluoromethylsulfonate imide were put into a 100mL flask, stirred at 40 ℃ for 10 hours to obtain a uniform solution, and 0.15g of Li was added6.4La3Zr1.4Ta0.6O12And 0.15g Li1.5Al0.5Ge1.5(PO4)3Adding the mixed solution into the solution, performing ultrasonic dispersion for 15min, stirring for 12h at 60 ℃ to obtain a uniform mixed solution, casting the mixed solution on a polytetrafluoroethylene mold, and drying in a vacuum oven at 60 ℃ for 24h to obtain the polyethylene oxide all-solid-state electrolyte. The polyalkylene oxide all-solid electrolyte was in the form of a film, and the thickness of the film was 70 μm.
Comparative example 1
3g of polyethylene oxide, 20g of acetonitrile and 2.1g of lithium bistrifluoromethylsulfonate imide were put into a 100mL flask, stirred at 40 ℃ for 8 hours to obtain a uniform solution, and 0.30g of Li was added1.5Al0.5Ge1.5(PO4)3Adding the mixed solution into the solution, performing ultrasonic dispersion for 10min, stirring for 12h at 70 ℃ to obtain a uniform mixed solution, casting the mixed solution on a polytetrafluoroethylene mold, and drying in a vacuum oven at 50 ℃ for 24h to obtain the polyethylene oxide all-solid-state electrolyte. The polyalkylene oxide all-solid electrolyte was in the form of a film, and the thickness of the film was 70 μm.
Comparative example 2
3g of polyethylene oxide, 20g of acetonitrile and 2.1g of lithium bistrifluoromethylsulfonate imide were put into a 100mL flask, stirred at 40 ℃ for 8 hours to obtain a uniform solution, and 0.15g of Li was added1.5Al0.5Ge1.5(PO4)3And 0.15g Li7La3Zr2O12Adding the mixed solution into the solution, performing ultrasonic dispersion for 10min, stirring for 12h at 70 ℃ to obtain a uniform mixed solution, casting the mixed solution on a polytetrafluoroethylene mold, and drying in a vacuum oven at 50 ℃ for 24h to obtain the polyethylene oxide all-solid-state electrolyte. The polyalkylene oxide all-solid electrolyte was in the form of a film, and the thickness of the film was 70 μm.
Comparative example 3
5g of polyethylene oxide, 35g N, N-dimethylformamide and 3g of lithium bistrifluoromethylsulfonate were put into a 250mL flask, stirred at 50 ℃ for 10 hours to obtain a uniform solution, and 1.0g of Li was added6.4La3Zr1.4Ta0.6O12Adding the mixed solution into the solution, performing ultrasonic dispersion for 20min, stirring for 16h at 80 ℃ to obtain a uniform mixed solution, casting the mixed solution on a polytetrafluoroethylene mold, and drying in a vacuum oven at 80 ℃ for 24h to obtain the polyethylene oxide all-solid-state electrolyte. The polyalkylene oxide all-solid electrolyte is in the form of a membrane, and the thickness of the membrane is 100 μm.
Comparative example 4
5g of polyethylene oxide, 35g N, N-dimethylformamide and 3g of lithium bistrifluoromethylsulfonate were put into a 250mL flask, stirred at 50 ℃ for 10 hours to obtain a uniform solution, and 0.6g of Li was added6.4La3Zr1.4Ta0.6O12And 0.4g of Li1.3Al0.3Ti1.7(PO4)3Adding the mixed solution into the solution, performing ultrasonic dispersion for 20min, stirring for 16h at 80 ℃ to obtain a uniform mixed solution, casting the mixed solution on a polytetrafluoroethylene mold, and drying in a vacuum oven at 80 ℃ for 24h to obtain the polyethylene oxide all-solid-state electrolyte. The polyalkylene oxide all-solid electrolyte is in the form of a membrane, and the thickness of the membrane is 100 μm.
Comparative example 5
5g of polyethylene oxide, 35g N, N-dimethylformamide and 3g of lithium bistrifluoromethylsulfonate were put into a 250mL flask, stirred at 50 ℃ for 10 hours to obtain a uniform solution, and 0.6g of Li was added6.5La3Zr1.4Ta0.6O12And 0.4g Li1.42Al0.4Ge1.6(PO4)3Adding the mixed solution into the solution, performing ultrasonic dispersion for 20min, stirring for 16h at 80 ℃ to obtain a uniform mixed solution, casting the mixed solution on a polytetrafluoroethylene mold, and drying in a vacuum oven at 80 ℃ for 24h to obtain the polyethylene oxide all-solid-state electrolyte. The polyalkylene oxide all-solid electrolyte is in the form of a membrane, and the thickness of the membrane is 100 μm.
Testing
The room temperature (25 ℃) conductivity of the all-solid electrolytes prepared in each example and comparative example were measured according to electrochemical ac impedance spectroscopy, and the results are shown in fig. 1 and table 1.
TABLE 1
Numbering Conductivity (25 ℃ C.) S.cm-1
Example 1 2.63×10-4
Example 2 1.25×10-4
Example 3 1.06×10-4
Example 4 9.34×10-5
Example 5 1.01×10-4
Practice ofExample 6 9.75×10-5
Example 7 1.21×10-4
Example 8 2.37×10-4
Comparative example 1 6.02×10-5
Comparative example 2 6.44×10-5
Comparative example 3 5.91×10-5
Comparative example 4 6.27×10-5
Comparative example 5 7.61×10-5
As can be seen from Table 1 and FIG. 1, the present invention uses Li as the solid electrolyte, as compared to the all-solid electrolyte obtained using a single inorganic ceramic fast ion conductor filler or a compounded inorganic ceramic fast ion conductor filler of other compositions6.4La3Zr1.4Ta0.6O12And Li1.5Al0.5Ge1.5(PO4)3The all-solid-state electrolyte obtained by being used as the compound inorganic ceramic fast ion conductor filler has higher room temperature conductivity.
In addition, the room-temperature conductivity of the obtained all-solid-state electrolyte can be further improved by controlling the proportion of the two inorganic ceramic fast ion conductor fillers in a preferable range.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.

Claims (10)

1. The all-solid-state electrolyte of the polyalkylene oxide is characterized by comprising the polyalkylene oxide, an inorganic ceramic fast ion conductor filler and a lithium salt, wherein the inorganic ceramic fast ion conductor filler is made of Li6.4La3Zr1.4Ta0.6O12And Li1.5Al0.5Ge1.5(PO4)3And (4) forming.
2. The polyalkylene oxide all-solid electrolyte according to claim 1, wherein Li is Li6.4La3Zr1.4Ta0.6O12And Li1.5Al0.5Ge1.5(PO4)3In a weight ratio of 0.25-4: 1, preferably 0.3 to 3: 1, more preferably 0.5 to 2: 1.
3. the polyalkylene oxide all solid electrolyte according to claim 1, wherein the weight content of the polyalkylene oxide is 35 to 90%, preferably 40 to 80%, and more preferably 50 to 70%, based on the total weight of the polyalkylene oxide all solid electrolyte; the weight content of the inorganic ceramic fast ion conductor filler is 0.5-50%, preferably 2-40%, and more preferably 5-20%; the content by weight of the lithium salt is 9 to 50%, preferably 18 to 50%, and more preferably 25 to 40%.
4. The polyalkylene oxide all-solid-state electrolyte according to claim 1, wherein the polyalkylene oxide is a polyalkylene oxide, preferably polyethylene oxide and/or polypropylene oxide.
5. The polyalkylene oxide all-solid electrolyte according to any one of claims 1 to 4, wherein the lithium salt is one or more of lithium bistrifluoromethylsulfonate imide, lithium hexafluorophosphate, lithium bistrifluorosulfonimide, lithium perchlorate, lithium tetrafluorophosphate, lithium difluorophosphate, lithium bisoxalato borate, and lithium difluorooxalato borate; lithium hexafluorophosphate and/or lithium bistrifluoromethylsulfonate are preferred.
6. The polyalkylene oxide all-solid electrolyte according to any one of claims 1 to 4, wherein the polyalkylene oxide all-solid electrolyte is in the form of a film, and the thickness of the film is 60 to 200 μm.
7. The method for preparing a polyalkylene oxide all-solid electrolyte according to any one of claims 1 to 6, comprising the steps of:
1) mixing the polyalkylene oxide and the lithium salt with an organic solvent to obtain a mixed solution;
2) adding the inorganic ceramic fast ion conductor filler into the mixed solution to form a suspension;
3) and drying the suspension to obtain the polyalkylene oxide all-solid-state electrolyte.
8. The production method according to claim 7, wherein step 3) includes:
3-1) coating the suspension on a mould by using a solution casting method to form a liquid film;
3-2) carrying out vacuum drying on the liquid film to obtain the polyalkylene oxide all-solid-state electrolyte.
9. The production method according to claim 7 or 8,
in the step 1), the mass concentration of solute in the mixed solution is 10-40%; the organic solvent is one or more of N, N-dimethylformamide, N-dimethylacetamide, acetonitrile and acetone, preferably acetonitrile and/or N, N-dimethylformamide, and further preferably acetonitrile;
the step 1) comprises the following steps: mixing the polyalkylene oxide and the lithium salt with an organic solvent, and fully stirring to completely dissolve the polyalkylene oxide and the lithium salt to obtain a mixed solution; the stirring is preferably carried out at 40 ℃ to 75 ℃;
the step 2) comprises the following steps: adding the inorganic ceramic fast ion conductor filler into the mixed solution, performing ultrasonic dispersion, and uniformly stirring to form a suspension; the stirring is preferably carried out at 40 ℃ to 75 ℃;
in the step 3), the temperature of the vacuum drying is 25-80 ℃, and the time is 12-48 hours.
10. A lithium ion battery, which comprises a positive electrode, a negative electrode and an electrolyte, wherein the electrolyte is the polyalkylene oxide all-solid-state electrolyte according to any one of claims 1 to 6.
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