Preparation of barium titanate nanowire enhanced in-situ polymerization solid electrolyte and lithium metal battery

Abstract

The invention discloses preparation of a barium titanate nanowire enhanced in-situ polymerization solid electrolyte and a lithium metal battery, and belongs to the technical field of lithium metal battery polymer solid electrolyte materials. The electrolyte comprises a cyclic ether polymer monomer, a lithium salt and a barium titanate nanowire filler, and the barium titanate nanowire reinforced in-situ polymerization solid electrolyte can be obtained by fully mixing the components in an inert gas atmosphere. The electrolyte has high ionic conductivity, high ionic transference number and wide electrochemical window, so that the lithium metal battery has excellent rate capability and cycling stability.

Description

Technical Field

[0001] This invention belongs to the technical field of polymer solid electrolyte materials for lithium metal batteries, and particularly relates to the preparation of a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte and lithium metal batteries. Background Technology

[0002] Solid-state lithium metal batteries theoretically possess higher energy density and superior safety performance, making them a crucial development direction in the field of power batteries. Solid-state polymer-based electrolytes, with their excellent flexibility and superior lithium salt solubility, provide key support for the practical application of solid-state lithium metal batteries. Among them, solid-state electrolytes formed by in-situ polymerization of liquid monomers, represented by 1,3-dioxolane (DOL), have become a research hotspot in this field due to their combination of high ionic conductivity and excellent electrode-electrolyte integration.

[0003] However, this type of in-situ polymerized solid electrolyte still faces three major technological bottlenecks: First, the low concentration of mobile lithium ions leads to uneven ion deposition on the lithium metal anode surface, which in turn induces lithium dendrite growth, severely restricting the cycle stability of the battery; second, the slow ion migration kinetics at the cathode interface make it difficult to pair with a high-nickel cathode (LiNi). 0.8 Mn 0.1 Co 0.1 The rate performance of batteries (O2, NCM811) is poor; thirdly, the residual DOL monomers in the electrolyte are prone to interfacial reactions with the electrodes, further damaging the interfacial stability of the battery and posing safety hazards, which greatly limits its practical application. Summary of the Invention

[0004] To enhance the ion transport capacity of electrolytes and improve the cycle performance of lithium metal batteries, this invention proposes a method for preparing a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte and a lithium metal battery thereof. High-dielectric-constant barium titanate nanowire filler with polarization-induced effect is prepared by electrospinning. This filler is then combined with a cyclic ether polymer monomer solution and in-situ polymerized to prepare a polymer solid electrolyte possessing high ionic conductivity, high ion transport number, and a wide electrochemical window. Lithium metal batteries assembled based on this electrolyte simultaneously achieve excellent cycle stability and rate performance.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A barium titanate nanowire-reinforced in-situ polymerized solid electrolyte comprises, by mass percentage: 60-80 wt.% cyclic ether polymer monomers, 10-30 wt.% lithium salt, and 2-10 wt.% barium titanate nanowire filler.

[0007] The barium titanate nanowire filler used in this invention exhibits a polarization-inducing effect, generating a built-in electric field in the electrolyte. This promotes lithium salt dissociation, increases the concentration of mobile lithium ions and ionic conductivity, creates high-flux lithium ion diffusion paths, induces uniform ion deposition, suppresses dendrite growth, and achieves stable battery cycle performance. Simultaneously, this polarization-inducing effect optimizes the space charge layer at the cathode interface, enhances ion transport kinetics, and significantly improves the rate performance of lithium metal batteries.

[0008] Furthermore, the cyclic ether polymer monomer is selected from at least one of 1,3-dioxolane, 2-ethyl-1,3-dioxolane, 1,3,5-trioxane, 1,4-dioxane, 1,3-dioxane, 1,2-epoxycyclopentene, and 1,2-epoxycyclopentene derivatives.

[0009] Furthermore, the lithium salt is an in-situ polymerization initiator selected from at least one of lithium hexafluorophosphate, lithium difluorooxalate borate, lithium bis(trifluoromethanesulfonyl)imide, and lithium bis(fluorosulfonyl)imide.

[0010] Furthermore, the barium titanate nanowire filler is prepared by electrospinning technology.

[0011] Furthermore, the preparation method of the barium titanate nanowire filler includes the following steps:

[0012] (1) Barium titanate was dispersed in a mixed solution of ethanol, acetic acid and deionized water, and then 5 wt.% polyvinylpyrrolidone was added. The mixture was stirred at room temperature for 2 h. Tetrabutyl titanate was added dropwise during the stirring process to obtain a precursor solution.

[0013] (2) The precursor solution was electrospun to obtain barium titanate nanofibers;

[0014] (3) The barium titanate nanofibers are subjected to high-temperature sintering and ball milling in sequence to obtain barium titanate nanowire fillers.

[0015] Furthermore, the volume ratio of ethanol, acetic acid, and deionized water is 6:3:1.

[0016] Furthermore, the conditions for electrospinning are as follows: feed rate of 1.2 mL / h, voltage of 12 kV, distance between syringe and roller of 18 cm, roller speed of 60 rpm, ambient humidity of 35 ± 5%, and temperature of 28 ± 2 °C.

[0017] Furthermore, the specific operation of the high-temperature sintering is as follows: sintering at 300℃ for 2 hours; the specific operation of the ball milling treatment is as follows: a planetary ball mill is selected as the equipment, equipped with a sealed zirconia ball mill jar, the rotation speed is 300 r / min, and the ball milling time is 12 hours.

[0018] The present invention also provides a method for preparing a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte, comprising the following steps: thoroughly mixing cyclic ether polymer monomers, lithium salts and barium titanate nanowire fillers under an inert gas atmosphere and then subjecting them to an in-situ polymerization reaction to obtain a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte.

[0019] The solid electrolyte prepared by in-situ polymerization in this invention exhibits a high monomer conversion rate, further improving the stability and safety of the battery.

[0020] This invention also provides an application of barium titanate nanowire-reinforced in-situ polymerized solid electrolyte in lithium metal batteries.

[0021] A method for preparing a solid-state lithium metal battery includes the following steps: mixing the components of a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte to form a mixed solution, and then placing it in a battery casing to carry out an in-situ polymerization reaction to obtain a lithium metal battery with a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte.

[0022] Compared with the prior art, the present invention has the following advantages and technical effects:

[0023] The barium titanate nanowire-reinforced in-situ polymerized solid electrolyte provided by this invention has high ionic conductivity, high ion transference number and wide electrochemical window, which enables lithium metal batteries to have excellent rate performance and cycle stability.

[0024] The preparation method provided by this invention is simple, easy to implement, and scalable, further reducing production costs. It has promising application prospects in the field of solid-state lithium metal batteries. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0026] Figure 1 This is a transmission electron microscope image of the barium titanate nanowire filler prepared in Example 1;

[0027] Figure 2 Nuclear magnetic resonance (NMR) of the electrolytes prepared in Example 1 and Comparative Example 1 7 Li spectrum;

[0028] Figure 3 Arrhenius spectra of the electrolytes prepared in Examples 1, 2 and 1;

[0029] Figure 4 Linear sweep voltammetry curves of the electrolytes prepared in Example 1 and Comparative Example 2;

[0030] Figure 5 Tafel curves of the electrolytes prepared in Example 1 and Comparative Example 3;

[0031] Figure 6 Time-voltage curves of lithium metal symmetric cells prepared in Application Example 1 and Comparative Application Example 1;

[0032] Figure 7 For comparison, a scanning electron microscope image of the lithium metal anode after cycling of the PDOL symmetric battery prepared in Example 1;

[0033] Figure 8 Scanning electron microscope image of the lithium metal anode of the PDOL-BTONw symmetric battery prepared in Example 1 after cycling;

[0034] Figure 9 The rate performance graphs are for the NCM811 full cells prepared in Application Example 2 and Comparative Application Example 2. Detailed Implementation

[0035] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0036] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0037] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0038] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be apparent to those skilled in the art. This specification and embodiments are merely exemplary.

[0039] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0040] This invention provides a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte, which comprises, by mass percentage: 60-80 wt.% (exemplary, 80 wt.%) of cyclic ether polymer monomers, 10-30 wt.% (exemplary, 12 wt.%) of lithium salt, and 2-10 wt.% (exemplary, 8 wt.%) of barium titanate nanowire filler.

[0041] In some optional embodiments, the cyclic ether polymer monomer is selected from at least one of 1,3-dioxolane, 2-ethyl-1,3-dioxolane, 1,3,5-trioxane, 1,4-dioxane, 1,3-dioxane, and 1,2-epoxycyclopentene and their derivatives. Exemplarily, in the following preferred embodiments of the invention, the cyclic ether polymer monomer is selected from 1,3-dioxolane.

[0042] In some optional embodiments, the lithium salt is an in-situ polymerization initiator selected from at least one of lithium hexafluorophosphate, lithium difluorooxalate borate, lithium bis(trifluoromethanesulfonyl)imide, and lithium bis(fluorosulfonyl)imide. Exemplarily, in the following preferred embodiments of the invention, lithium bis(fluorosulfonyl)imide is selected as the lithium salt.

[0043] In some optional embodiments, barium titanate nanowire fillers are prepared by electrospinning technology, and the specific preparation method includes the following steps:

[0044] (1) Barium titanate was dispersed in a mixed solution of ethanol, acetic acid and deionized water (volume ratio of ethanol, acetic acid and deionized water was 6:3:1), and then 5 wt.% polyvinylpyrrolidone was added. The mixture was stirred at room temperature for 2 h, and tetrabutyl titanate was added dropwise during the stirring process to obtain the precursor solution.

[0045] (2) The precursor solution was electrospun to obtain barium titanate nanofibers. The conditions for electrospinning were: feed rate of 1.2 mL / h, voltage of 12 kV, distance between syringe and roller of 18 cm, roller speed of 60 rpm, humidity of spinning environment of 35 ± 5%, and temperature of 28 ± 2℃.

[0046] (3) Barium titanate nanofibers were sintered at 300°C for 2 hours and then ball-milled to obtain barium titanate nanowire fillers.

[0047] The preparation method of the barium titanate nanowire-reinforced in-situ polymerized solid electrolyte includes the following steps: cyclic ether polymer monomers, lithium salts and barium titanate nanowire fillers are thoroughly mixed in an inert gas atmosphere and then undergo an in-situ polymerization reaction to obtain barium titanate nanowire-reinforced in-situ polymerized solid electrolyte.

[0048] This barium titanate nanowire-enhanced in-situ polymerized solid electrolyte can be used in lithium metal batteries.

[0049] A method for preparing a solid-state lithium metal battery includes the following steps: mixing the components of a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte to form a mixed solution, and then placing it in a battery casing to carry out an in-situ polymerization reaction to obtain a lithium metal battery with a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte.

[0050] Unless otherwise specified, "room temperature" in this invention refers to 25±2℃.

[0051] All raw materials used in this invention were purchased from the market.

[0052] The technical solution of the present invention will be further illustrated by the following embodiments.

[0053] Example 1

[0054] A method for preparing a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte comprises the following steps:

[0055] S1. Preparation of barium titanate nanowire filler:

[0056] (1) Disperse 0.65g of barium titanate in a mixed solution of ethanol, acetic acid and deionized water (volume ratio of ethanol, acetic acid and deionized water is 6:3:1), then add 5wt.% polyvinylpyrrolidone, stir at room temperature for 2h, and add 0.25mL of tetrabutyl titanate dropwise during stirring to obtain the precursor solution;

[0057] (2) The precursor solution was electrospun to obtain barium titanate nanofibers. The conditions for electrospinning were: feed rate of 1.2 mL / h, voltage of 12 kV, distance between syringe and roller of 18 cm, roller speed of 60 rpm, humidity of spinning environment of 35 ± 5%, and temperature of 28 ± 2℃.

[0058] (3) Barium titanate nanofibers were sintered at 300℃ for 2 hours and then ball-milled (the equipment used was a planetary ball mill equipped with a sealed zirconia ball mill jar, the speed was 300 r / min, and the ball milling time was 12 hours) to obtain barium titanate nanowire filler.

[0059] S2. Preparation of barium titanate nanowire-reinforced in-situ polymerized solid electrolyte:

[0060] 1,3-dioxolane, lithium bis(fluorosulfonyl)imide, and barium titanate nanowire filler were mixed thoroughly under an argon atmosphere for 1 hour at a mass ratio of 20:3:2 (i.e., the amounts used were 80 wt.%, 12 wt.%, and 8 wt.%, respectively) to obtain a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte, denoted as PDOL-BTONw.

[0061] Example 2

[0062] Same as Example 1, except that the amount of 1,3-dioxolane is 80 wt.%, the amount of lithium bis(fluorosulfonyl)imide is 14 wt.%, and the amount of barium titanate nanowire filler is 6 wt.%.

[0063] The resulting barium titanate nanowire-reinforced in-situ polymerized solid electrolyte is denoted as PDOL-BTONw-a.

[0064] Comparative Example 1

[0065] 1,3-dioxolane and lithium difluorosulfonylimide were thoroughly mixed in an inert gas atmosphere at a mass ratio of 20:3 to obtain an electrolyte, denoted as PDOL.

[0066] Comparative Example 2

[0067] A method for preparing a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte comprises the following steps:

[0068] S1. Preparation of barium titanate nanowire filler:

[0069] (1) Disperse 0.85g of barium titanate in a mixed solution of ethanol, acetic acid and deionized water (volume ratio of ethanol, acetic acid and deionized water is 6:3:1), then add 5wt.% polyvinylpyrrolidone, stir at room temperature for 2h, and add 0.35mL of tetrabutyl titanate dropwise during stirring to obtain the precursor solution;

[0070] (2) The precursor solution was electrospun to obtain barium titanate nanofibers. The conditions for electrospinning were: feed rate of 1.2 mL / h, voltage of 15 kV, distance between syringe and roller of 18 cm, roller speed of 60 rpm, humidity of spinning environment of 35 ± 5%, and temperature of 28 ± 2℃.

[0071] (3) Barium titanate nanofibers were sintered at 300℃ for 2 hours and then ball-milled (the equipment used was a planetary ball mill equipped with a sealed zirconia ball mill jar, the speed was 300 r / min, and the ball milling time was 12 hours) to obtain barium titanate nanowire filler.

[0072] S2. Preparation of barium titanate nanowire-reinforced in-situ polymerized solid electrolyte:

[0073] 1,3-dioxolane, lithium bis(fluorosulfonyl)imide, and barium titanate nanowire filler were mixed thoroughly under an argon atmosphere for 1 hour at a mass ratio of 20:3:2 (i.e., the amounts used were 80 wt.%, 12 wt.%, and 8 wt.%, respectively) to obtain a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte, denoted as PDOL-BTONw-b.

[0074] Comparative Example 3

[0075] Same as Example 1, except that the amount of 1,3-dioxolane is 53 wt.%, the amount of lithium bis(fluorosulfonyl)imide is 35 wt.%, and the amount of barium titanate nanowire filler is 12 wt.%.

[0076] The resulting barium titanate nanowire-reinforced in-situ polymerized solid electrolyte is denoted as PDOL-BTONw-c.

[0077] Figure 1 This is a transmission electron microscope image of the barium titanate nanowire filler prepared in Example 1. Figure 1 As can be seen, the diameter of the barium titanate nanowire filler is approximately 250 nm.

[0078] Figure 2 Nuclear magnetic resonance (NMR) of the electrolytes prepared in Example 1 and Comparative Example 1 7 Li spectrum, from Figure 2 As can be seen, the PDOL-BTONw electrolyte prepared in Example 1 has a weaker Li... + The coordination environment indicates that the addition of barium titanate nanowire filler can promote the dissociation of LiFSI.

[0079] Figure 3 The Arrhenius spectra of the electrolytes prepared in Examples 1, 2, and 1 are shown below. Figure 3 As can be seen from the data, the ionic conductivity of PDOL-BTONw and PDOL-BTONw-a electrolytes prepared in Examples 1 and 2 is higher than that of PDOL electrolyte in a certain temperature range, indicating that the addition of barium titanate nanowire filler can improve the ion migration ability of the electrolyte.

[0080] Figure 4 The linear sweep voltammetry curves of the electrolytes prepared in Example 1 and Comparative Example 2 are shown below. Figure 4 As can be seen, the decomposition voltage of the PDOL-BTONw electrolyte prepared in Example 1 is as high as 5.23V, which is much higher than the decomposition voltage of 4.88V of the PDOL-BTONw-b electrolyte prepared in Comparative Example 2. This indicates that the addition of barium titanate nanowire filler prepared by this method can broaden the electrochemical window of the electrolyte.

[0081] Figure 5The Tafel curves of the electrolytes prepared in Example 1 and Comparative Example 3 are shown below. Figure 5 As can be seen from the data, the corrosion current of the PDOL-BTONw electrolyte prepared in Example 1 is higher than that of the PDOL-BTONw-c electrolyte prepared in Comparative Example 3, indicating that the addition of barium titanate nanowire filler prepared by this method can stabilize the electrode / electrolyte interface.

[0082] Application Example 1

[0083] The preparation of a lithium metal symmetric battery is as follows: The electrolyte prepared in Example 1 is placed in the Li||Li symmetric battery casing to obtain a lithium metal symmetric battery, denoted as PDOL-BTONw symmetric battery.

[0084] Comparative Application Example 1

[0085] The preparation of a lithium metal symmetric battery is as follows: The electrolyte prepared in Comparative Example 1 is placed in the Li||Li symmetric battery casing to obtain a lithium metal symmetric battery, denoted as PDOL symmetric battery.

[0086] Figure 6 To obtain the time-voltage curves of the lithium metal symmetric cells prepared in Application Example 1 and Comparative Application Example 1, from... Figure 6 As can be seen from this, the PDOL-BTONw symmetric cell at 0.5 mA cm⁻¹ −2 / 0.5mAh cm −2 The battery can cycle stably for more than 1200 hours, indicating that the addition of barium titanate nanowire filler can improve the cycle stability of in-situ polymerized solid lithium metal batteries.

[0087] Figure 7 For comparison, a scanning electron microscope image of the lithium metal anode after cycling of the PDOL symmetric battery prepared in Example 1; Figure 8 The image shows a scanning electron microscope image of the lithium metal anode of the PDOL-BTONw symmetric battery prepared in Example 1 after cycling. As can be seen from the image, the lithium metal anode of the PDOL-BTONw symmetric battery has a smoother surface morphology after cycling, indicating that the addition of barium titanate nanowire filler can improve the electrolyte's ability to suppress lithium dendrites.

[0088] Application Example 2

[0089] The preparation of an NCM811 full cell involves the following steps:

[0090] (1) Preparation of cathode materials: high-nickel cathode material LiNi 0.8 Mn 0.1 Co 0.1O2 (NCM811), conductive carbon, and polyvinylidene fluoride were ground in a mass ratio of 8:1:1. Then, an appropriate amount of N-methylpyrrolidone was added to make a slurry. The slurry was then evenly coated onto an aluminum foil current collector with a scraper, dried, and cut into pieces to serve as the positive electrode of a lithium metal battery.

[0091] (2) The electrolyte prepared in Example 1 was placed in the Li||NCM811 full cell casing to obtain the NCM811 full cell, which is denoted as PDOL-BTONw full cell.

[0092] Comparative Application Example 2

[0093] The preparation of an NCM811 full cell involves the following steps:

[0094] (1) Preparation of cathode materials: high-nickel cathode material LiNi 0.8 Mn 0.1 Co 0.1 O2 (NCM811), conductive carbon, and polyvinylidene fluoride were ground in a mass ratio of 8:1:1. Then, an appropriate amount of N-methylpyrrolidone was added to make a slurry. The slurry was then evenly coated onto an aluminum foil current collector with a scraper, dried, and cut into pieces to serve as the positive electrode of a lithium metal battery.

[0095] (2) The electrolyte prepared in Comparative Example 1 was placed in the Li||NCM811 full cell casing to obtain the NCM811 full cell, which is denoted as PDOL full cell.

[0096] Figure 9 To illustrate the rate performance of the NCM811 full cells prepared in Application Example 2 and Comparative Application Example 2, from... Figure 9 As can be seen, the PDOL-BTONw full cell exhibits high discharge specific capacity at rates ranging from 0.1 to 2C, indicating that the addition of barium titanate nanowire filler can improve the rate performance of in-situ polymerized solid NCM811 full cells.

[0097] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A barium titanate nanowire-reinforced in-situ polymerized solid electrolyte, characterized in that, The components, by mass percentage, include: 60-80 wt.% cyclic ether polymer monomers, 10-30 wt.% lithium salts, and 2-10 wt.% barium titanate nanowire fillers.

2. The barium titanate nanowire-reinforced in-situ polymerized solid electrolyte according to claim 1, characterized in that, The cyclic ether polymer monomers are selected from at least one of 1,3-dioxolane, 2-ethyl-1,3-dioxolane, 1,3,5-trioxane, 1,4-dioxane, 1,3-dioxane, 1,2-epoxycyclopentene, and 1,2-epoxycyclopentene derivatives.

3. The barium titanate nanowire-reinforced in-situ polymerized solid electrolyte according to claim 1, characterized in that, The lithium salt is an in-situ polymerization initiator selected from at least one of lithium hexafluorophosphate, lithium difluorooxalate borate, lithium bis(trifluoromethanesulfonyl)imide, and lithium bis(fluorosulfonyl)imide.

4. The barium titanate nanowire-reinforced in-situ polymerized solid electrolyte according to claim 1, characterized in that, The barium titanate nanowire filler was prepared by electrospinning.

5. The barium titanate nanowire-reinforced in-situ polymerized solid electrolyte according to claim 4, characterized in that, The preparation method of the barium titanate nanowire filler includes the following steps: (1) Barium titanate was dispersed in a mixed solution of ethanol, acetic acid and deionized water, and then polyvinylpyrrolidone was added. Tetrabutyl titanate was added dropwise during stirring to obtain a precursor solution. (2) The precursor solution was electrospun to obtain barium titanate nanofibers; (3) The barium titanate nanofibers are subjected to high-temperature sintering and ball milling in sequence to obtain barium titanate nanowire fillers.

6. The barium titanate nanowire-reinforced in-situ polymerized solid electrolyte according to claim 5, characterized in that, The volume ratio of ethanol, acetic acid, and deionized water is 6:3:

1.

7. The barium titanate nanowire-reinforced in-situ polymerized solid electrolyte according to claim 5, characterized in that, The conditions for electrospinning are as follows: feed rate of 1.2 mL / h, voltage of 12 kV, distance between syringe and roller of 18 cm, roller speed of 60 rpm, ambient humidity of 35 ± 5%, and temperature of 28 ± 2 ℃.

8. The barium titanate nanowire-reinforced in-situ polymerized solid electrolyte according to claim 5, characterized in that, The specific operation of the high-temperature sintering is as follows: sintering at 300℃ for 2 hours; and / or, The specific operation of the ball milling process is as follows: the rotation speed is 300 r / min, and the ball milling time is 12 h.

9. A method for preparing a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte as described in any one of claims 1-8, characterized in that, Includes the following steps: Cyclic ether polymer monomers, lithium salts, and barium titanate nanowire fillers were thoroughly mixed in an inert gas atmosphere to obtain a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte.

10. The application of a barium titanate nanowire-reinforced in-situ polymerized solid electrolyte as described in any one of claims 1-8 in lithium metal batteries.

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