Solid-state electrolyte and preparation method therefor, battery, battery pack, and electric device

Abstract

Disclosed are a solid-state electrolyte and a preparation method therefor, a battery, a battery pack, and an electric device. The solid-state electrolyte comprises an electrolyte salt and an organic polymer, and the structure of a monomer of the organic polymer is shown in formula A. In formula A, R1-R3 are each independently selected from hydrogen, alkyl or haloalkyl having 1-3 carbon atoms, alkoxy or haloalkoxy having 1-3 carbon atoms, phenyl, halophenyl, phenoxy, or halophenoxy.

Description

Solid-state electrolyte, preparation method thereof, battery, battery pack and electric device

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202411332526.X, filed on September 23, 2024, and entitled "Solid-state electrolyte, preparation method thereof, battery, battery pack and electric device", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of batteries, and in particular to a solid-state electrolyte, a preparation method thereof, a battery, a battery pack and an electric device. BACKGROUND

[0004] The solid-state electrolyte has advantages of a wide electrochemical stability window and a high flash point, and can effectively inhibit the growth of lithium dendrites, and is often used in high-energy-density and high-safety battery systems (lithium metal || high-voltage positive electrode material, silicon || high-voltage positive electrode material). The polymer solid-state electrolyte in the solid-state electrolyte has advantages of good interface contact, simple production process and low cost. However, the lithium ion transference number of the polymer solid-state electrolyte is low, and the coulombic efficiency is low, thereby easily reducing the cycle performance of the battery, and thus reducing the application of the polymer solid-state electrolyte in the actual battery.

[0005] DISCLOSURE

[0006] The present disclosure aims to at least solve one of the technical problems existing in the prior art. To this end, a first object of the present disclosure is to provide a solid-state electrolyte, which improves the ionic conductivity, ion transference number, coulombic efficiency and electrochemical stability window of the solid-state electrolyte, improves the cycle stability of the battery, and is beneficial to the application of the solid-state electrolyte in the battery.

[0007] A second object of the present disclosure is to provide a preparation method of a solid-state electrolyte.

[0008] A third object of the present disclosure is to provide a battery.

[0009] A fourth object of the present disclosure is to provide a battery pack.

[0010] A fifth object of the present disclosure is to provide an electric device.

[0011] The solid-state electrolyte according to the first aspect of the present disclosure comprises an electrolyte salt and an organic polymer, and the structure formula of the monomer of the organic polymer is shown in the following formula A:

[0012] In formula A, R1-R3 are independently selected from hydrogen, alkyl or haloalkyl having 1-3 carbon atoms, alkoxy or haloalkoxy having 1-3 carbon atoms, phenyl, halophenyl, phenoxy or halophenoxy.

[0013] According to the solid-state electrolyte of the embodiments of the present disclosure, by using the organic polymer, the migration mode of ions in the solid-state electrolyte between the organic polymers can be changed, the ionic conductivity and the ion transference number of the solid-state electrolyte are improved. At the same time, the structure of the organic polymer can effectively induce the decomposition of anions in the electrolyte salt to generate an electrode-electrolyte interface layer rich in inorganic phase, thereby effectively inhibiting the side reaction between the electrode and the electrolyte, improving the coulombic efficiency and cycle stability of the battery, and facilitating the application of the solid-state electrolyte in the battery.

[0014] According to some embodiments of the present disclosure, R1-R3 are independently selected from hydrogen, methyl, halomethyl, methoxy or halomethoxy, phenyl, halophenyl, phenoxy or halophenoxy.

[0015] According to some embodiments of the present disclosure, the monomer of the organic polymer comprises 3-methyl oxetane, 3-fluoromethyloxetane, 3-chloromethyloxetane or 3,3-dimethylethoxy.

[0016] According to some embodiments of the present disclosure, the monomer of the organic polymer comprises 3-iodomethyloxetane or oxetane-3-carboxaldehyde.

[0017] According to some embodiments of the present disclosure, the mass ratio of the electrolyte salt to the organic polymer is 1:(0.7-71).

[0018] According to some embodiments of the present disclosure, the mass ratio of the electrolyte salt to the organic polymer is 1:(1.5-5).

[0019] According to some embodiments of the present disclosure, the electrolyte salt comprises a lithium salt.

[0020] According to some embodiments of the present disclosure, the electrolyte salt comprises at least one of LiCl, LiNO3, LiCF3SO3, Li(FSO2)2N and C2F6LiNO4S2.

[0021] The preparation method of the solid-state electrolyte according to the second aspect of the embodiments of the present disclosure comprises the following steps: in-situ polymerization reaction of the monomer of the organic polymer, the electrolyte salt and the initiator, and the solid-state electrolyte is obtained.

[0022] According to some embodiments of the present disclosure, the concentration of the electrolyte salt is 0.05 mol / L-5 mol / L; and / or the weight of the initiator accounts for the weight ratio of the electrolyte salt is w, wherein the w satisfies: 0.01wt%≤w≤10wt%.

[0023] According to some embodiments of the present disclosure, the initiator comprises at least one of tin chloride, indium chloride and aluminum triflate.

[0024] According to some embodiments of the present disclosure, the reaction temperature of the in-situ polymerization reaction is 45-55°C, and the reaction time is 25-35 min.

[0025] The battery according to the third aspect of the embodiments of the present disclosure comprises: a solid-state electrolyte, which is the solid-state electrolyte according to the first aspect of the embodiments of the present disclosure or prepared by the preparation method according to the second aspect of the embodiments of the present disclosure; a positive electrode sheet; and a negative electrode sheet.

[0026] The battery pack according to the fourth aspect of the embodiments of the present disclosure comprises at least one battery according to the third aspect of the embodiments of the present disclosure.

[0027] The power consumption device according to the fifth aspect of the embodiments of the present disclosure comprises at least one battery pack according to the fourth aspect of the embodiments of the present disclosure.

[0028] Additional aspects and advantages of the present disclosure will be in part apparent and in part pointed out hereinafter. DETAILED DESCRIPTION

[0029] The solid-state electrolyte according to the first aspect of the embodiments of the present disclosure is described below, wherein the monomer of the organic polymer can significantly improve the ionic conductivity, ion transference number and Coulomb efficiency of the solid-state electrolyte after polymerization, improve the cycle stability of the battery, and facilitate the application of the solid-state electrolyte in the battery.

[0030] The solid-state electrolyte according to the first aspect of the embodiments of the present disclosure comprises an electrolyte salt and an organic polymer, and the structure of the monomer of the organic polymer is shown in the following formula A:

[0031] Therefore, the oxygen-containing group in the monomer of the organic polymer can provide a binding site for lithium ions and the like, and the monomer of the organic polymer can be polymerized to form an organic polymer by in-situ polymerization, which can change the migration mode of ions in the solid-state electrolyte between the organic polymers, improve the ionic conductivity and ion transference number of the solid-state electrolyte. At the same time, the structure of the monomer of the organic polymer can effectively induce the decomposition of anions in the electrolyte salt to generate an electrode-electrolyte interface layer rich in inorganic phase, thereby effectively inhibiting the side reaction between the electrode and the electrolyte and improving the cycle stability of the battery.

[0032] In formula A, R1-R3 are independently selected from hydrogen, alkyl or haloalkyl having 1-3 carbon atoms, alkoxy or haloalkoxy having 1-3 carbon atoms, phenyl, halophenyl, phenoxy or halophenoxy. The length of the above-mentioned alkyl or haloalkyl, alkoxy or haloalkoxy, phenyl, halophenyl, phenoxy or halophenoxy is small, thereby reducing the length of the monomer of the organic polymer, avoiding the increase in viscosity of the solid-state electrolyte and the aggregation of the organic polymer due to the long length of the monomer of the organic polymer, improving the uniformity of the solid-state electrolyte, and further improving the conductivity stability and cycle stability of the battery.

[0033] According to the solid-state electrolyte of the embodiments of the present disclosure, by using the organic polymer, the migration mode of ions in the solid-state electrolyte between the organic polymers can be changed, and the ionic conductivity and ion transference number of the solid-state electrolyte can be improved. Meanwhile, the structure of the above-mentioned organic polymer can effectively induce the decomposition of anions in the electrolyte salt to generate an electrode-electrolyte interface layer rich in inorganic phases, thereby effectively inhibiting the side reaction between the electrode and the electrolyte, improving the coulombic efficiency and cycle stability of the battery, and being beneficial to the application of the solid-state electrolyte in the battery.

[0034] According to some embodiments of the present disclosure, R1-R3 are independently selected from hydrogen, methyl, halomethyl, methoxy or halomethoxy, phenyl, halophenyl, phenoxy or halophenoxy. The length of the above-mentioned substituents is small, and by independently selecting the above-mentioned substituents at R1-R3, the aggregation of the organic polymer can be avoided, thereby improving the uniformity of the solid-state electrolyte, and improving the cycle stability and conductivity performance of the battery. Meanwhile, the formation of steric hindrance between the substituents of R1-R3 and the remaining active sites on the organic polymer is avoided, so as to reduce the combination difficulty of the organic polymer and the ions, improve the efficiency of the in-situ polymerization of the organic polymer, and ensure the ionic conductivity and ion transference number of the solid-state electrolyte during the use of the battery.

[0035] Further, the monomer of the organic polymer includes 3-methyl oxetane, 3-fluoromethyl oxetane, 3-chloromethyl oxetane or 3,3-dimethyl ethoxy. The above-mentioned monomers all satisfy the structure limitation of the monomer of the organic polymer, and are all derivatives of oxetane, having high reactivity. The tension of the four-membered ring makes it easy to undergo ring-opening reaction and in-situ polymerization to form the organic polymer, so as to meet the needs of the solid-state electrolyte.

[0036] In addition, the monomer of the organic polymer includes 3-iodomethyl oxetane or oxetane-3-carboxaldehyde. Among them, 3-iodomethyl oxetane and oxetane-3-carboxaldehyde can both be converted by functional group conversion, first converted into a monomer containing a functional group (such as olefin, acrylate, etc.) which is easier to polymerize, and then polymerized; or 3-iodomethyl oxetane and oxetane-3-carboxaldehyde can both react with other polymerizable monomers to form a copolymer.

[0037] In addition, the mass ratio of the electrolyte salt and the organic polymer is 1:(0.7-71). In this way, the mass ratio of the electrolyte salt and the organic polymer is reasonable, the organic polymer can effectively induce the decomposition of the anions in the electrolyte salt to generate an electrode-electrolyte interface layer rich in inorganic phase, inhibit the side reaction between the electrode and the electrolyte, improve the coulomb efficiency and cycle stability of the battery, and at the same time avoid the waste of the electrolyte salt or the organic polymer, which is conducive to controlling the cost of the solid-state electrolyte.

[0038] Preferably, the mass ratio of the electrolyte salt and the organic polymer is 1:(1.5-5).

[0039] According to some embodiments of the present disclosure, the electrolyte salt comprises a lithium salt. The lithium salt has good ionic conductivity, moderate solvation ability and high electrochemical stability. In this way, the use of lithium salt as the electrolyte salt is conducive to improving the ionic conductivity of the solid-state electrolyte.

[0040] Further, the electrolyte salt comprises at least one of LiCl, LiNO3, LiCF3SO3, Li(FSO2)2N and C2F6LiNO4S2. The above-mentioned lithium salts (i.e. LiCl, LiNO3, LiCF3SO3, Li(FSO2)2N and C2F6LiNO4S2) all have good thermal stability and electrochemical stability, so when at least one of the above-mentioned lithium salts is selected as the electrolyte salt, it is conducive to reducing the risk of thermal runaway, keeping the solid-state electrolyte in good stability during the cycle of battery charging and discharging, and improving the use safety of the solid-state electrolyte.

[0041] The preparation method of the solid-state electrolyte according to the second aspect of the present disclosure comprises the following steps: in-situ polymerization of monomers of the organic polymer, the electrolyte salt and the initiator, i.e. the preparation is completed.

[0042] Under the initiation of the initiator, the organic polymer is in-situ polymerized and combined with the cations separated from the electrolyte salt, so that the anions separated from the electrolyte salt are decomposed into an electrode-electrolyte interface layer rich in inorganic phase, thereby effectively inhibiting the side reaction between the electrode and the solid-state electrolyte, improving the stability of the solid-state electrolyte, and further improving the ionic conductivity of the solid-state electrolyte.

[0043] The preparation method of the solid-state electrolyte according to the embodiments of the present disclosure simplifies the preparation method, reduces the temperature and time conditions of the preparation, thereby improving the preparation efficiency of the solid-state electrolyte, and is conducive to reducing the cost of the solid-state electrolyte and the battery using the above-mentioned solid-state electrolyte.

[0044] Further, the concentration of the electrolyte salt is 0.05 mol / L to 5 mol / L. When the concentration of the electrolyte salt is less than 0.05 mol / L, the electrolyte salt is less, and the electrode-electrolyte interface layer rich in inorganic phase generated by decomposition of the electrolyte salt is difficult to meet the effect of inhibiting the side reaction between the electrode and the electrolyte; when the concentration of the electrolyte salt is greater than 5 mol / L, the electrolyte salt is more, and the electrolyte salt is difficult to fully dissolve, reducing the fullness of the in-situ polymerization reaction of the monomer of the organic polymer, the electrolyte salt and the initiator, and easily reducing the quality of the solid-state electrolyte. Therefore, by setting the concentration of the electrolyte salt to 0.05 mol / L to 5 mol / L, the electrolyte salt is fully dissolved, the monomer of the organic polymer, the electrolyte salt and the initiator are fully polymerized in-situ, and the quality of the solid-state electrolyte is improved, and by making the thickness of the electrode-electrolyte interface layer appropriate, the quality of the solid-state electrolyte is improved, and the application of the solid-state electrolyte in the battery is facilitated.

[0045] The weight ratio of the initiator to the electrolyte salt is w, wherein w satisfies: 0.01wt%≤w≤10wt%. When the weight ratio of the initiator to the electrolyte salt is less than 0.01wt%, the free radicals generated by decomposition of the initiator cannot completely promote the polymerization reaction of the monomer of the organic polymer in the solid-state electrolyte, reducing the polymerization efficiency and degree of the organic polymer, so that the electrode-electrolyte interface layer rich in inorganic phase generated by decomposition of the electrolyte anion cannot be induced, and the effect of inhibiting the side reaction between the electrode and the electrolyte is difficult to meet. When the weight ratio of the initiator to the electrolyte salt is greater than 10wt%, the initiator will cause the organic polymer to be fully initiated and polymerized, and part of the initiator is wasted, thereby increasing the cost of the solid-state electrolyte. Therefore, by setting the weight ratio of the initiator to the electrolyte salt to 10wt%, it is beneficial to ensure that the initiator initiates the polymerization of the monomer of the organic polymer, while avoiding the waste of the initiator and reducing the cost of the battery.

[0046] According to some embodiments of the present disclosure, the initiator includes at least one of tin chloride, indium chloride and aluminum triflate. Among them, the tin chloride can promote the activation of the functional groups of the monomer of the organic polymer by providing chloride ions or as a Lewis acid to play a role in initiating or catalyzing polymerization. As an initiator, indium chloride is beneficial to improve the stereoregularity of the organic polymer formed by polymerization of the monomer of the organic polymer, and generate an organic polymer with a specific microstructure. As a Lewis acid catalyst, aluminum triflate is beneficial to promote the polymerization of the monomer of the organic polymer to form an organic polymer.

[0047] The reaction temperature of the in-situ polymerization reaction is 45-55 DEG C, and the reaction time is 25-35 min. Under the above reaction temperature and reaction time, the monomer of the organic polymer is polymerized in-situ under the initiation of the initiator, and at the same time, the anion of the electrolyte salt is decomposed into the electrode-electrolyte interface layer rich in inorganic phase.

[0048] The battery according to the third aspect of the present disclosure comprises a solid-state electrolyte, a positive electrode sheet and a negative electrode sheet. The solid-state electrolyte is prepared by the preparation method according to the second aspect of the present disclosure.

[0049] The battery according to the present disclosure has the advantages of improving the conductivity of the battery, thereby improving the charging and discharging efficiency of the battery and improving the use efficiency of the battery.

[0050] The battery pack according to the fourth aspect of the present disclosure comprises at least one battery according to the third aspect of the present disclosure.

[0051] The battery pack according to the present disclosure has the advantages of improving the stability of the battery pack in charging or discharging, prolonging the service life of the battery pack, and improving the market competitiveness of the battery pack.

[0052] The electrical equipment according to the fifth aspect of the present disclosure comprises at least one battery pack according to the fourth aspect of the present disclosure.

[0053] The electrical equipment according to the present disclosure has the advantages of improving the operation stability of the electrical equipment, improving the user experience, and improving the market competitiveness of the electrical equipment.

[0054] The embodiments of the present disclosure are described in detail below. It should be noted that the embodiments described below are exemplary and are used to explain the present disclosure, and cannot be understood as a limitation of the present disclosure. In addition, if not specifically stated, all reagents used in the following embodiments are commercially available or can be synthesized according to the methods described herein or known methods, and the reaction conditions not listed are also easily obtained by those skilled in the art.

[0055] Embodiment 1

[0056] The embodiment is a solid-state electrolyte of 3-methyl-1,2-epoxybutane ring-opening polymerization, which is obtained by polymerization reaction of a monomer of an organic polymer, an electrolyte salt and an initiator at 50°C for 30 min. The electrolyte salt is LiTFSI (lithium bis(trifluoromethanesulfonyl)imide, C2F6LiNO4S2), the monomer of the organic polymer is 3-methyl-1,2-epoxybutane, and the initiator is aluminum triflate. The concentration of the solid-state electrolyte is 1.2 mol / L, and the initiator accounts for 1% of the total mass of the electrolyte. The weight ratio of the electrolyte salt to the organic polymer in the solid-state electrolyte is 1:3.

[0057] Example 2

[0058] Example 2 differs from Example 1 in that the concentration of the electrolyte salt is 0.05 mol / L, and the weight ratio of the electrolyte salt to the organic polymer is 1:71.

[0059] Example 3

[0060] Example 3 differs from Example 1 in that the concentration of the electrolyte salt is 5 mol / L, and the weight ratio of the electrolyte salt to the organic polymer is 1:0.7.

[0061] Example 4

[0062] Example 4 differs from Example 1 in that the concentration of the electrolyte salt is 0.72 mol / L, and the weight ratio of the electrolyte salt to the organic polymer is 1:5.

[0063] Example 5

[0064] Example 5 differs from Example 1 in that the concentration of the electrolyte salt is 0.18 mol / L, and the weight ratio of the electrolyte salt to the organic polymer is 1:20.

[0065] Example 6

[0066] Example 6 differs from Example 1 in that the concentration of the electrolyte salt is 0.09 mol / L, and the weight ratio of the electrolyte salt to the organic polymer is 1:40.

[0067] Example 7

[0068] Example 7 differs from Example 1 in that the concentration of the electrolyte salt is 0.065 mol / L, and the weight ratio of the electrolyte salt to the organic polymer is 1:55.

[0069] Example 8

[0070] Example 8 differs from Example 1 in that the initiator accounts for 0.01 wt% of the total mass of the electrolyte.

[0071] Example 9

[0072] Example 9 differs from Example 1 in that the initiator is 10 wt% of the total mass of the electrolyte.

[0073] Example 10

[0074] Example 10 differs from Example 1 in that the monomer of the organic polymer is 3-fluoromethyloxetane.

[0075] Example 11

[0076] Example 11 differs from Example 1 in that the monomer of the organic polymer is 3-chloromethyloxetane.

[0077] Example 12

[0078] Example 12 differs from Example 1 in that the monomer of the organic polymer is 3-iodomethyloxetane.

[0079] Example 13

[0080] Example 13 differs from Example 1 in that the concentration of the electrolyte salt is 2.4 mol / L, and the weight ratio of the electrolyte salt and the organic polymer is 1:1.5.

[0081] Comparative Example 1

[0082] This comparative example is a 1,3-dioxolane ring-opening polymerized polymer solid-state electrolyte, which is composed of a monomer of an organic polymer, an electrolyte salt, and an initiator, wherein the electrolyte salt is LiTFSI, the monomer of the organic polymer is 1,3-dioxolane, and the initiator is aluminum triflate. Among them, the concentration of the solid-state electrolyte is 1.2 mol / L, and the initiator is 1% of the total mass of the electrolyte.

[0083] Comparative Example 2

[0084] Comparative Example 2 differs from Example 1 in that the organic polymer is tetrahydrofuran.

[0085] Performance Test

[0086] 1. The solid-state electrolyte of the new polymer monomer ring-opening polymerization in Examples 1-8 was selected as the research object, and the solid-state electrolyte of 1,3-dioxolane and tetrahydrofuran ring-opening polymerization in Comparative Examples 1-2 was selected as the control group. First, we will measure the lithium ion transference number of the mixed assembled Li||Li symmetrical battery of the solid-state electrolyte. The specific test results are shown in Table 1, wherein the thickness of the lithium sheet is 450 microns.

[0087] 2. The solid-state electrolytes of the new polymeric monomers in Examples 1-8 were chosen as the research object, and the solid-state electrolytes of 1,3-dioxolane and tetrahydrofuran ring-opening polymerization in Comparative Examples 1-2 were chosen as the control group. Li||Cu half-batteries were assembled to measure the average coulombic efficiency of lithium metal. The specific test results are shown in Table 1, wherein the thickness of the lithium sheet is 450 microns, and the copper foil is 9 microns.

[0088] 3. The solid-state electrolytes of 3-methyl oxetane ring-opening polymerization in Examples 1-8 were chosen as the research object, and the solid-state electrolytes of 1,3-dioxolane ring-opening polymerization in Comparative Examples 1-2 were chosen as the control group. Li||NMC811 full batteries were assembled to measure the long cycle performance of lithium metal batteries, wherein the cutoff voltage was 2.8-4.4V. The specific test results are shown in Table 1, wherein the thickness of the lithium sheet is 450 microns.

[0089] Table 1 Test data of Examples 1-13 and Comparative Examples 1-2

[0090] Test results

[0091] As shown in Table 1, Comparative Example 1 is a solid-state electrolyte of 1,3-dioxolane ring-opening polymerization, and the lithium ion transference number is only 0.52. The lithium ion transference number of Comparative Example 2 is only 0.5. It is worth noting that Example 1 is a polymer solid-state electrolyte of 3-methyl oxetane ring-opening polymerization, and the lithium ion transference number is as high as 0.86. This is mainly because after the ring-opening polymerization of 3-methyl oxetane, the structure of the polymer has changed significantly. There are two methyl groups between the two oxygen atoms in the polymer chain of 1,3-dioxolane ring-opening polymerization, and there are three methyl groups between the two oxygen atoms in the polymer chain of 3-methyl oxetane ring-opening polymerization. This unique carbon chain structure can significantly weaken the binding force of lithium ions, which significantly improves the lithium ion transference number. When the proportion of electrolyte salt increases or decreases, the lithium ion transference number of the solid-state electrolyte decreases significantly (Examples 2 and 3).

[0092] In addition, with reference to Examples 1, 8 and 9, the amount of initiator can also significantly affect the lithium ion transference number of the solid-state battery. When the amount of initiator is small (for example, 0.01wt%), the degree of monomer polymerization is not enough, the flowability of the solid-state electrolyte is large, and lithium ions cannot be transported through the solid-state electrolyte. When the amount of initiator is large (for example, 10wt%), a large amount of initiator remains, which easily leads to the blocking of lithium ion diffusion. Other expanded structures also have similar mechanisms and properties (Examples 10 and 11).

[0093] As shown in Table 1, the coulombic efficiency of the Li||Cu half-cell of Comparative Example 1 decreases as the current density increases, which is mainly due to the low lithium ion transference number of Comparative Example 1, resulting in the formation of irreversible lithium dendrites and dead lithium during lithium metal deposition. At a current density of 0.5 mA / cm 2 , the lithium metal coulombic efficiency of Comparative Example 1 is 89.7%. In sharp contrast, the lithium metal coulombic efficiency of Example 1 is 99.4% at a current density of 0.5 mA / cm 2 , and only decreases to 97.3% as the current density increases. This is mainly due to the high lithium ion transference number of Example 1, which allows uniform lithium metal deposition, and the organic polymer induces anion decomposition to form a LiF-containing interfacial layer, inhibiting side reactions between the electrolyte and lithium metal, further improving the lithium metal coulombic efficiency.

[0094] As shown in Table 1, the capacity retention of Comparative Example 1 and Comparative Example 2 is only 26% and 12% after 50 cycles. In contrast, Example 1 has excellent lithium ion transference number and lithium metal coulombic efficiency, and its capacity retention is still 93% after 50 cycles, and this excellent electrochemical performance is also reflected in other extended structures (Example 10 and Example 11). In the full cell, the performance behavior of the solid-state electrolyte is consistent with the lithium ion transference number and the lithium metal coulombic efficiency.

[0095] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure.

[0096] In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example.

[0097] Although the embodiments of the present disclosure have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made hereto without departing from the principles and spirit of the present disclosure, and the scope of the present disclosure is defined by the claims and their equivalents.

Claims

1. A solid state electrolyte, characterized by, Comprising: Electrolyte salts and organic polymers, the monomer of which has the structural formula shown in formula A below: In formula A, R1-R3 are independently selected from hydrogen, alkyl or haloalkyl having 1-3 carbon atoms, alkoxy or haloalkoxy having 1-3 carbon atoms, phenyl, halo-phenyl, phenoxy or halo-phenoxy.

2. The solid-state electrolyte of claim 1, wherein, R1-R3 are independently selected from hydrogen, methyl, halo-methyl, methoxy or halo-methoxy, phenyl, halo-phenyl, phenoxy or halo-phenoxy.

3. The solid-state electrolyte of claim 1 or 2, wherein, The monomer of the organic polymer comprises 3-methyl oxetane, 3-fluoromethyl oxetane, 3-chloromethyl oxetane or 3,3-dimethyl ethylene.

4. The solid-state electrolyte of claim 1 or 2, wherein, The monomer of the organic polymer comprises 3-iodomethyl oxetane or oxetane-3-carboxaldehyde.

5. The solid-state electrolyte of any one of claims 1-4, wherein, The mass ratio of the electrolyte salt to the organic polymer is 1:(0.7-71).

6. The solid-state electrolyte of claim 5, wherein, The mass ratio of the electrolyte salt to the organic polymer is 1:(1.5-5).

7. The solid-state electrolyte of any one of claims 1-6, wherein, The electrolyte salt comprises a lithium salt.

8. The solid-state electrolyte of claim 7, wherein, The electrolyte salt comprises at least one of LiCl, LiNO3, LiCF3SO3, Li(FSO2)2N and C2F6LiNO4S2.

9. A method of producing the solid-state electrolyte according to any one of claims 1 to 8, characterized by, Comprising the following steps: in-situ polymerization reaction of a monomer of an organic polymer, an electrolyte salt and an initiator.

10. The method of claim 9, wherein, The concentration of the electrolyte salt is 0.05 mol / L-5 mol / L; and / or The weight ratio of the initiator to the electrolyte salt is w, wherein the w satisfies: 0.01wt%≤w≤10wt%.

11. The production method according to claim 9 or 10, characterized by, The initiator comprises at least one of tin chloride, indium chloride and aluminum triflate.

12. The production method according to any one of claims 9 to 11, characterized by, The reaction temperature of the in-situ polymerization reaction is 45°C-55°C, and the reaction time is 25 min-35 min.

13. A battery, characterized by Comprising: A solid-state electrolyte according to any one of claims 1-8, or prepared according to any one of claims 9-12; A positive electrode sheet; and A negative electrode sheet.

14. A battery pack, characterized by Comprising at least one battery according to claim 13.

15. An electrical device, characterized by Comprising at least one battery pack according to claim 14.

Images