Gel solid electrolyte, solid lithium ion battery, preparation method and application

Abstract

The invention discloses a gel solid electrolyte, a solid lithium ion battery, a preparation method and application. The preparation method of the gel solid electrolyte comprises the following steps: mixing a lithium salt with perfluorohexanone to prepare an electrolyte, mixing the electrolyte with a curing agent, and carrying out a curing reaction to prepare the gel solid electrolyte, wherein the lithium salt is soluble in the perfluorohexanone. The invention provides the preparation method of the gel solid electrolyte based on in-situ curing, and the gel solid electrolyte prepared by the preparation method has safe and flame-retardant characteristics and ionic conductivity, is not easy to leak and is high in safety.

Description

Technical Field

[0001] The present invention relates to the field of lithium ion batteries, and in particular to a gel solid electrolyte, a solid lithium ion battery, a preparation method and an application thereof. Background Art

[0002] As an important component of modern energy storage, lithium-ion batteries provide efficient energy in many fields. However, the thermal runaway and electrolyte leakage problems of lithium-ion batteries cannot be ignored. These two phenomena are interrelated and may cause serious consequences, posing a major challenge to the safety and reliability of batteries.

[0003] Thermal runaway is an extremely dangerous state that may occur in lithium-ion batteries under certain conditions, involving a series of complex physical and chemical changes. When the battery is working normally, the various reactions inside are in a relatively balanced and stable state, and the storage and release of electrical energy are achieved through the migration of ions between the positive and negative electrodes. However, due to defects in the manufacturing process, the electrodes are partially in poor contact, or the diaphragm is broken due to external impact, wear, etc. during use, so that the positive and negative electrodes are in direct contact, resulting in an internal short circuit. Once a short circuit occurs, the current increases sharply and a large amount of heat is generated instantly, which not only accelerates the chemical reaction rate inside the battery, but also causes the temperature to rise rapidly. As the temperature rises, the electrolyte inside the battery begins to decompose. The electrolyte in a lithium-ion battery is usually an organic liquid substance, and its main function is to conduct ions between the positive and negative electrodes of the battery to achieve charge transfer and the battery's charging and discharging functions. At high temperatures, organic solvents will decompose to produce flammable gases, such as carbon monoxide and hydrogen. The production of these gases increases the internal pressure of the battery, providing fuel for subsequent possible combustion, further exacerbating the development of thermal runaway.

[0004] Therefore, new electrolytes with better safety are urgently needed. Summary of the invention

[0005] In view of the problem of poor safety of existing electrolytes, a gel solid electrolyte, a solid lithium ion battery, a preparation method and an application are provided.

[0006] In a first aspect, in some embodiments, a method for preparing a gel solid electrolyte is provided, the method for preparing the gel solid electrolyte comprising the following steps:

[0007] Mixing lithium salt and perfluorohexanone to prepare an electrolyte, mixing the electrolyte with a curing agent, and performing a curing reaction to prepare the gel solid electrolyte;

[0008] Wherein, the lithium salt is soluble in perfluorohexanone.

[0009] In some embodiments, in the method for preparing the gel solid electrolyte provided, the mass ratio of the electrolyte to the curing agent is (1-9): (1-9) based on the amount of materials added.

[0010] In some embodiments, in the method for preparing the gel solid electrolyte provided, the mass ratio of the electrolyte to the curing agent is (7-9): (1-3) based on the amount of feed.

[0011] In some embodiments, in the method for preparing the gel solid electrolyte provided, the lithium salt includes one or more of lithium chloride and lithium nitrate.

[0012] In some embodiments, in the method for preparing the gel solid electrolyte provided, the concentration of the lithium salt in the electrolyte is 1 mol / L~2 mol / L.

[0013] In some embodiments, in the method for preparing the gel solid electrolyte provided, the curing agent includes polyethylene glycol diacrylate.

[0014] In some embodiments, in the preparation method of the gel solid electrolyte provided, the curing reaction is carried out at 50° C. to 70° C., and the curing reaction time is 0.5 h to 2 h.

[0015] In a second aspect, in some embodiments, a gel solid electrolyte is provided, wherein the gel solid electrolyte is prepared by the preparation method.

[0016] In a third aspect, in some embodiments, there is provided a use of the gel solid electrolyte in the preparation of a solid-state lithium-ion battery.

[0017] In a fourth aspect, in some embodiments, a solid-state lithium-ion battery is provided, wherein the solid-state lithium-ion battery comprises the gel solid electrolyte.

[0018] The present application provides a method for preparing a gel solid electrolyte based on in-situ curing. The gel solid electrolyte prepared by the preparation method provided above has both safe flame retardant properties and ion conductivity, is not prone to leakage, and has high safety. DETAILED DESCRIPTION

[0019] In order to facilitate understanding of the present invention, the present invention is described more fully below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0021] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:

[0022] The terms "and / or", "or / and", and "and / or" used in this application include any one of two or more related listed items, and also include any and all combinations of related listed items, and the arbitrary and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items. It should be noted that when at least three items are connected by at least two conjunctions selected from "and / or", "or / and", and "and / or", it should be understood that in this application, the technical solution undoubtedly includes technical solutions that are all connected by "logical and", and undoubtedly includes technical solutions that are all connected by "logical or". For example, "A and / or B" includes three parallel solutions of A, B and "a combination of A and B".

[0023] In the present application, "plurality", "multiple", "multiple times", "multiples", etc., unless otherwise specified, refer to a number greater than 2 or equal to 2. For example, "one or more" means one or greater than or equal to two.

[0024] The terms "combination thereof", "any combination thereof", "any combination thereof" and the like used in this application include all suitable combinations of any two or more of the listed items.

[0025] As used in this application, "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements that are inherent to such process, method, article, or apparatus.

[0026] In this application, the "suitable" mentioned in "suitable combination", "suitable method", "any suitable method", etc. is based on the ability to implement the technical solution of this application, solve the technical problems of this application, and achieve the expected technical effects of this application.

[0027] In the present application, "preferred", "better", "more preferred" and "suitable" are only used to describe implementation methods or examples with better effects. It should be understood that they do not constitute limitations on the scope of protection of the present application.

[0028] In the present application, "further", "further", "particularly" and the like are used for descriptive purposes to indicate differences in content, but should not be construed as limiting the scope of protection of the present application.

[0029] In this application, "optionally", "optional", and "optional" mean optional or dispensable, that is, any one of the two parallel schemes of "yes" or "no". If multiple "options" appear in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction, each "optional" is independent.

[0030] In the present invention, in the "first aspect", "second aspect", "third aspect", "fourth aspect", etc., the terms "first", "second", "third", "fourth", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0031] In this application, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0032] In this application, numerical values ​​represent approximate measured values ​​or range limits to cover slight deviations from given values ​​and embodiments having approximately the mentioned values ​​and embodiments having exactly the mentioned values. Except in the working examples provided at the end of the detailed description, all numerical values ​​of (such as amount or condition) parameters in this specification (including the appended claims) should be understood to be modified by the term "approximately" in all cases, regardless of whether "approximately" actually appears before the numerical value. "Approximately" means that the numerical value allows a certain slight imprecision (close to the exact value of the value to a certain extent; approximately or reasonably approximate the value; almost). If the imprecision provided by "approximately" is not understood separately in this art in this common sense, then "approximately" used herein refers to at least the deviation that can be caused by the common methods of measuring and using such parameters. For example, "approximately" may include less than or equal to 5%, optionally less than or equal to 4%, optionally less than or equal to 3%, optionally less than or equal to 2%, optionally less than or equal to 1%, optionally less than or equal to 0.5%, and optionally less than or equal to 0.1% deviation in some aspects.

[0033] Additionally, disclosure of ranges includes disclosure of all values ​​within the entire range and further subdivided ranges, including endpoints and subranges given within those ranges.

[0034] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0035] In the present application, when it comes to numerical intervals (i.e., numerical ranges), unless otherwise specified, the optional numerical distribution is considered continuous within the above numerical interval, and includes the two numerical endpoints (i.e., the minimum and maximum values) of the numerical range, and each numerical value between the two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to the integers within the numerical interval, it includes the two endpoint integers of the numerical range, and each integer between the two endpoints. In this article, it is equivalent to directly listing each integer, such as t is an integer selected from 1 to 10, indicating that t is any integer selected from the group of integers consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10. In addition, when multiple ranges are provided to describe features or characteristics, these ranges can be combined. In other words, unless otherwise specified, the ranges disclosed herein should be understood to include any and all subranges included therein.

[0036] The temperature parameters in this application, unless otherwise specified, are allowed to be either constant temperature treatment or to vary within a certain temperature range. It should be understood that the constant temperature treatment allows the temperature to fluctuate within the accuracy range controlled by the instrument. Fluctuations within the range of ±5°C, ±4°C, ±3°C, ±2°C, and ±1°C are allowed.

[0037] In the present application, % (w / w) and wt% both represent weight percentage, % (v / v) refers to volume percentage, and % (w / v) refers to mass volume percentage.

[0038] "Room temperature" in this application generally refers to 5°C ~ 30°C, for example, 5°C, 6°C, 7°C, 8°C, 9°C, 10°C, 11°C, 12°C, 13°C, 14°C, 15°C, 16°C, 17°C, 18°C, 19°C, 20°C, 21°C, 22°C, 23°C, 24°C, 25°C, 26°C, 27°C, 28°C, 29°C, 30°C, preferably refers to 25±5°C.

[0039] Perfluorohexanone is an important fluorinated ketone compound with the chemical formula C6F 12 O, molecular weight is 316.0444, it is a clear, colorless, odorless liquid at room temperature, boiling point is 49℃, melting point is -108℃, density is 1.6g / cm³, and toxicity is low. The high proportion of fluorine atoms in the molecular structure makes its molecular structure very stable, not easy to react chemically with other substances, and has high stability at room temperature.

[0040] Lithium-ion batteries are currently widely used, but the safety challenges brought about by thermal runaway limit the promotion of lithium-ion batteries. How to ensure the safety of battery use is one of the biggest problems facing battery technology today. Replacing traditional organic liquid electrolytes with solid electrolytes is a measure to solve battery safety issues. In order to ensure application safety, fire extinguishing agents are required, which has a great impact on the energy density of battery modules. If fire extinguishing agents can replace electrolytes, the safety performance of lithium-ion batteries will be greatly improved.

[0041] In one embodiment, a method for preparing a gel solid electrolyte is provided, comprising the following steps:

[0042] Mixing lithium salt and perfluorohexanone to prepare an electrolyte, mixing the electrolyte with a curing agent, and performing a curing reaction to prepare the gel solid electrolyte;

[0043] Among them, lithium salt is soluble in perfluorohexanone.

[0044] In one embodiment, in the preparation method of the provided gel solid electrolyte, the mass ratio of the electrolyte to the curing agent is (1-9): (1-9) based on the feeding amount, and the mass ratio of the electrolyte to the curing agent can also be (7-9): (1-3). For example, the mass ratio of the electrolyte to the curing agent can be 1:1, 1:3, 1:5, 1:7, 1:9, 2:1, 2:3, 2:5, 2:7, 2:9, 3:1, 3:5, 3:7, 4:1, 4:3, 4:5, 4:7, 4:9, 5:1, 5:3, 5:5, 5:7, 5:9, 6:1, 6:5, 6:7, 6:8, 6:9, 7:1, 7:2, 7:3, 7:4, 7:5, 7:6, 7:8, 7:9, 8:1, 8:3, 8:5, 8:7, 8:9, and 9:1, 9:2, 9:4, 9:5, 9:8, etc. The mass ratio of the electrolyte to the curing agent can also be a range consisting of any two of the aforementioned ratios.

[0045] In one embodiment, in the preparation method of the provided gel solid electrolyte, the lithium salt includes one or more of lithium chloride and lithium nitrate. The lithium salt used can be dissolved in perfluorohexanone, and the electrolyte prepared by using the lithium salt containing one or more of lithium chloride and lithium nitrate and perfluorohexanone has ion conductivity and flame retardancy.

[0046] In one embodiment, in the preparation method of the provided gel solid electrolyte, the concentration of the lithium salt in the electrolyte is 1 mol / L~2 mol / L. For example, the concentration of the lithium salt in the electrolyte can be 1 mol / L, 1.1 mol / L, 1.2 mol / L, 1.3 mol / L, 1.4 mol / L, 1.5 mol / L, 1.6 mol / L, 1.7 mol / L, 1.8 mol / L, 1.9 mol / L, 2 mol / L, etc. The concentration of the lithium salt in the electrolyte can also be a range consisting of any two of the aforementioned values.

[0047] In one embodiment, in the method for preparing a gel solid electrolyte provided, the curing agent includes polyethylene glycol diacrylate.

[0048] Without limitation, the gel solid electrolyte is prepared by using a curing agent such as polyethylene glycol diacrylate, and the prepared gel solid electrolyte has good mechanical properties.

[0049] In one embodiment, in the preparation method of the provided gel solid electrolyte, the curing reaction is carried out at 50°C to 70°C, for example, the curing reaction can be carried out at 50°C, 51°C, 52°C, 53°C, 54°C, 55°C, 56°C, 57°C, 58°C, 59°C, 60°C, etc., and the curing reaction can be carried out within the range of any two of the above values. The curing reaction time is 0.5h to 2h, for example, the curing time can be 0.5h, 1h, 1.5h, 2h, etc., and the curing time can also be within the range of any two of the above values.

[0050] In one embodiment, a gel solid electrolyte is provided, and the gel solid electrolyte is prepared by the preparation method.

[0051] The provided gel solid electrolyte has excellent safety, flame retardancy and ion conductivity and is not prone to leakage.

[0052] In one embodiment, a use of the gel solid electrolyte in preparing a solid-state lithium-ion battery is provided.

[0053] In one embodiment, a solid-state lithium-ion battery is provided, wherein the solid-state lithium-ion battery comprises the gel solid electrolyte.

[0054] It can be understood that, in one embodiment, the provided solid-state lithium-ion battery further includes a positive electrode sheet and a negative electrode sheet.

[0055] It can be understood that in one embodiment, in the solid-state lithium-ion battery provided, the gel solid electrolyte is located between the positive electrode sheet and the negative electrode sheet.

[0056] It can be understood that in one embodiment, the above-mentioned positive electrode sheet can be a conventional positive electrode sheet in the art, which can specifically include a positive electrode collector and a positive electrode functional layer coated on the positive electrode collector, and the raw materials of the positive electrode functional layer can include positive electrode active materials, conductive agents and binders.

[0057] It can be understood that in one embodiment, the positive electrode active material can be at least one of conventional positive electrode active materials such as lithium iron phosphate, lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium manganese oxide, and lithium nickel cobalt oxide.

[0058] It can be understood that in one embodiment, the conductive agent can be one or more conventional conductive agents such as conductive carbon black (Super-P), Ketjen black, acetylene black, carbon nanotubes (CNT), graphene, flake graphite, etc.

[0059] It can be understood that, in one embodiment, the binder can be one or more conventional binders such as polytetrafluoroethylene, polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), etc.

[0060] It can be understood that, in one embodiment, the negative electrode sheet in the provided solid-state lithium-ion battery can be a conventional negative electrode sheet in the art, which contains a negative electrode current collector and a negative electrode active material coated on the surface of the negative electrode current collector.

[0061] It can be understood that in one embodiment, the negative electrode active material can specifically include at least one of a carbon-based material, metallic lithium, a metallic lithium alloy, and a silicon-based material, wherein the carbon-based material can be, for example, graphite or other materials.

[0062] In one embodiment, the solid-state lithium-ion battery may be a conventional solid-state lithium-ion battery, for example, a soft-pack battery, a button battery, or a mold battery.

[0063] The above-mentioned battery can be a wound battery or a stacked battery, which can be prepared according to conventional methods in the art. For example, the positive electrode sheet, the gel solid electrolyte and the negative electrode sheet can be placed in sequence, assembled by a winding or stacking method, and then packaged to make the above-mentioned solid-state lithium-ion battery.

[0064] The solid-state lithium-ion battery prepared using the gel solid electrolyte provided above has high safety, can effectively control thermal runaway, and is not prone to electrolyte leakage and combustion and explosion.

[0065] The provided solid-state lithium ion has a wide range of application scenarios. Without limitation, the provided solid-state lithium ion battery can be applied to mobile phones, tablet computers, laptop computers, pure electric vehicles, hybrid electric vehicles, home energy storage systems and industrial energy storage power stations, and can also be applied to the aerospace field and the medical equipment field.

[0066] To make the purpose, technical scheme and advantages of the present invention clearer, the implementation scheme of the present application will be described in detail below in conjunction with some embodiments. It should be understood that these embodiments are only used to illustrate the present application and are not used to limit the scope of the present application. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other. The experimental methods for which the conditions are not specified in the following examples are preferably referred to the guidance given in this application, and can also be based on the experimental manual or conventional conditions in the field, or can also be based on the conditions recommended by the manufacturer, or refer to experimental methods known in the art. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0067] 1. Preparation of gel solid electrolyte

[0068] Example 1

[0069] 1. Solubility test of lithium salt in fire extinguishing agent perfluorohexanone

[0070] Lithium hexafluorophosphate (LiPF6), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium chloride (LiCl), lithium fluoride (LiF), lithium phosphate (Li3PO4) and lithium nitrate (LiNO3) were added to the fire extinguishing agent perfluorohexanone at a concentration of 1 mol / L, respectively, and magnetically stirred and dispersed for 1 hour. The results can be seen in Table 1.

[0071] Table 1

[0072]

[0073] The above test screens lithium salts that can be dissolved in perfluorohexanone, which have the potential to be used in lithium-ion batteries. As shown in Table 1, lithium chloride and lithium nitrate can be dissolved in perfluorohexanone. However, lithium hexafluorophosphate, lithium bis(trifluoromethanesulfonyl)imide, lithium fluoride and lithium phosphate cannot be dissolved in perfluorohexanone.

[0074] 2. Ion conductivity test of fire extinguishing agent-based electrolyte

[0075] LiCl and LiNO3 were added to the fire extinguishing agent perfluorohexanone at a concentration of 1 mol / L to prepare an electrolyte. After magnetic stirring for 1 hour, the ion conductivity was tested.

[0076] The ionic conductivity test method is as follows: the prepared electrolyte is assembled into a steel symmetrical cell for electrochemical testing.

[0077] The ionic conductivity test results can be found in Table 2.

[0078] Table 2

[0079]

[0080] It can be seen from Table 2 that the ionic conductivity of perfluorohexanone containing 1 mol / L LiCl is 0.45 mS / cm, and the ionic conductivity of perfluorohexanone containing 1 mol / L LiNO3 is 0.32 mS / cm, which proves that LiCl and LiNO3 have the ability of ion conduction after being dissolved in the fire extinguishing agent perfluorohexanone.

[0081] 3. Preparation of Gel Solid Electrolyte

[0082] LiCl was dissolved in perfluorohexanone to obtain an electrolyte containing 1 mol / L LiCl, and then the prepared electrolyte and polyethylene glycol diacrylate (PEGDA) were mixed in a mass ratio of 1:9, and cured at 60°C for 1 hour to obtain a gel solid electrolyte.

[0083] Example 2

[0084] LiCl was dissolved in perfluorohexanone to obtain an electrolyte containing 1 mol / L LiCl, and then the prepared electrolyte and polyethylene glycol diacrylate (PEGDA) were mixed in a mass ratio of 3:7, and cured at 60°C for 1 hour to obtain a gel solid electrolyte.

[0085] Example 3

[0086] LiCl was dissolved in perfluorohexanone to obtain an electrolyte containing 1 mol / L LiCl, and then the prepared electrolyte and polyethylene glycol diacrylate (PEGDA) were mixed in a mass ratio of 5:5, and cured at 60°C for 1 hour to obtain a gel solid electrolyte.

[0087] Example 4

[0088] LiCl was dissolved in perfluorohexanone to obtain an electrolyte containing 1 mol / L LiCl, and then the prepared electrolyte and polyethylene glycol diacrylate (PEGDA) were mixed in a mass ratio of 7:3, and cured at 60°C for 1 hour to obtain a gel solid electrolyte.

[0089] Example 5

[0090] LiCl was dissolved in perfluorohexanone to obtain an electrolyte containing 1 mol / L LiCl, and then the prepared electrolyte and polyethylene glycol diacrylate (PEGDA) were mixed in a mass ratio of 9:1, and cured at 60°C for 1 hour to obtain a gel solid electrolyte.

[0091] 2. Performance Test

[0092] The electrolytes obtained in Examples 1 to 5 were subjected to ion conductivity tests and open flame tests.

[0093] The ionic conductivity test method is as follows: The electrolytes obtained in Examples 1 to 5 are assembled into steel symmetrical cells for electrochemical testing.

[0094] The open flame test method is as follows: the gel solid electrolyte obtained in Examples 1 to 5 is exposed to an igniter flame, and the flame temperature is about 300 degrees.

[0095] The ionic conductivity test results and open flame test results can be found in Table 3.

[0096] Table 3

[0097]

[0098] It can be seen from Table 3 that the gel solid electrolytes prepared in Examples 1 to 5 have excellent electrochemical properties and are flame retardant to open flames.

[0099] The provided gel solid electrolyte has excellent electrochemical properties and is flame retardant. It also solves the problem of easy leakage of electrolytes in current batteries and has high safety.

[0100] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0101] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims, and the description can be used to interpret the content of the claims.

[0102] The applicant declares that the present invention illustrates the detailed process equipment and process flow of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed process equipment and process flow, that is, it does not mean that the present invention must rely on the above-mentioned detailed process equipment and process flow to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A method for preparing a gel solid electrolyte, characterized in that: The following steps are involved: Mixing lithium salt and perfluorohexanone to prepare an electrolyte, mixing the electrolyte with a curing agent, and performing a curing reaction to prepare the gel solid electrolyte; Wherein, the lithium salt is soluble in perfluorohexanone.

2. The preparation method according to claim 1, characterized in that: Calculated by feed amount, the mass ratio of the electrolyte to the curing agent is (1-9): (1-9).

3. The preparation method according to claim 1 or 2, characterized in that: Calculated by feed amount, the mass ratio of the electrolyte to the curing agent is (7-9): (1-3).

4. The preparation method according to any one of claims 1 to 3, characterized in that The lithium salt includes one or more of lithium chloride and lithium nitrate.

5. The preparation method according to any one of claims 1 to 4, characterized in that The concentration of lithium salt in the electrolyte is 1 mol / L to 2 mol / L.

6. The preparation method according to any one of claims 1 to 5, characterized in that The curing agent includes polyethylene glycol diacrylate.

7. The preparation method according to any one of claims 1 to 6, characterized in that The curing reaction is carried out at 50° C. to 70° C., and the curing reaction time is 0.5 h to 2 h.

8. A gel solid electrolyte, characterized in that: The compound is prepared by the preparation method according to any one of claims 1 to 7.

9. Use of the gel solid electrolyte according to claim 8 in preparing a solid-state lithium-ion battery.

10. A solid-state lithium-ion battery, characterized in that: The solid-state lithium-ion battery comprises the gel solid-state electrolyte according to claim 8.

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