Curable composition for electrolyte gels and method for producing the same, as well as electrolyte gels, storage batteries and electronic devices

Abstract

To provide a curable composition for electrolyte gel that offers superior flame retardancy, ensures high solubility of electrolyte, and yields a cured product with a high resistance value, and uses thereof.SOLUTION: A curable composition for electrolyte gel disclosed herein includes component (A): a vinyl polymer with a crosslinkable functional group and an ether bond, component (B): a phosphoric diester, component (C): an initiator, and component (D): an electrolyte.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a curable composition for electrolyte gels and a method for producing the same, as well as an electrolyte gel, a storage battery, and an electronic device. [Background technology]

[0002] Rechargeable batteries, such as lithium-ion batteries, are increasingly being used as energy storage devices in numerous applications, particularly due to their high energy density or specific energy and low self-discharge properties. For example, lithium-ion batteries are already used as batteries in automobiles (especially as energy storage devices in electric vehicles), as rechargeable batteries in IoT-related devices such as laptop computers and smartphones, and as rechargeable batteries in stationary storage devices for homes and industries.

[0003] Lithium-ion batteries contain an electrolyte, which is located inside or between two different electrodes, the anode and the cathode. In this case, electrochemical energy is stored in the battery through the conversion of chemical energy into electrical energy.

[0004] Patent Document 1 discloses a flame-retardant composition for polymer solid electrolytes, characterized by containing a fluorine-containing phosphate ester represented by a specific formula. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2003-238821 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, the conventional technologies described above had room for improvement in terms of flame retardancy, solubility of the electrolytic material, and resistance of the cured product.

[0007] One aspect of the present invention aims to realize a curable composition for electrolyte gels that exhibits excellent flame retardancy, high solubility of the electrolyte, and low resistance of the cured product, and to enable its use. [Means for solving the problem]

[0008] To solve the above problems, a curable composition for electrolyte gels according to one aspect of the present invention comprises (A) a vinyl polymer having a crosslinkable functional group and an ether bond, (B) a phosphate diester, (C) an initiator, and (D) an electrolytic substance.

[0009] Furthermore, a method for producing a curable composition for an electrolyte gel according to one aspect of the present invention is a method for producing a curable composition for an electrolyte gel comprising: (A) component: a vinyl polymer having a crosslinkable functional group and an ether bond; (B) component: a phosphate diester; (C) component: an initiator; and (D) component: an electrolytic substance, comprising: (I) a step of mixing component (B) and component (D); (II) a step of mixing component (A) into the solution obtained in step (I); and (III) a step of mixing component (C) into the solution obtained in step (II). [Effects of the Invention]

[0010] According to one aspect of the present invention, a curable composition for electrolyte gels that exhibits excellent flame retardancy, high solubility of the electrolyte, and low resistance of the cured product, and its use can be provided. [Modes for carrying out the invention]

[0011] The following describes in detail some examples of embodiments of the present invention, but the present invention is not limited to these. Unless otherwise specified herein, "A to B" representing a numerical range means "greater than or equal to A and less than or equal to B". Furthermore, all references cited herein are incorporated herein by reference.

[0012] [1. Curable composition for electrolyte gels] A curable composition for electrolyte gels according to one aspect of the present invention comprises (A) a vinyl polymer having a crosslinkable functional group and an ether bond, (B) a phosphate diester, (C) an initiator, and (D) an electrolyte. In this specification, "curable composition for electrolyte gels" means a curable composition for obtaining an electrolyte gel. Hereinafter, "curable composition for electrolyte gels" will also be simply referred to as "curable composition." An electrolyte gel can be obtained by curing the curable composition. In this specification, "curing" means "gelation."

[0013] In conventional techniques such as those described in Patent Document 1, when preparing an electrolyte gel, it was necessary to add an organic solvent to ensure the ionic conductivity of the electrolyte. However, because the electrolyte gel contained an organic solvent, there was a concern about ignition if an ignition source was near the electrolyte gel. Furthermore, when an organic solvent was used to dissolve the electrolyte, it was difficult to dissolve and fill the electrolyte at a high concentration. As a result, the resistance value of the electrolyte gel increased, and consequently, it was difficult to set a high ionic conductivity.

[0014] The inventors have found that flame retardancy can be imparted to the electrolyte gel by using component (B). Furthermore, the inventors have discovered that while there was room for improvement in terms of the solubility of component (D) when using the triester phosphate described in Patent Document 1, when using diester phosphate as component (B), component (D) can be dissolved in the curable composition at a high concentration without the use of an organic solvent. This makes it possible to lower the resistance value of the electrolyte gel.

[0015] Furthermore, since the curable composition contains component (C), it can be cured at room temperature, by heating, or by UV curing. Generally, a vinyl polymer having a crosslinkable functional group cures at room temperature in the presence of component (C). However, even in the presence of component (C), if component (D) is further present, the curable composition does not cure at room temperature. In contrast, it has been found that using a vinyl polymer having a crosslinkable functional group and an ether bond as component (A) enables curing at room temperature. Although this is speculation, it is considered that since component (A) holds component (D) via the ether structure and then crosslinks, the inhibition of curing at room temperature caused by component (D) can be suppressed. Since the curable composition exhibits good curability, it can also suppress the generation of bleed on the surface of the cured product. Furthermore, it is speculated that the ability to highly load component (D) due to component (A) having an ether structure also contributes to reducing the resistance value of the electrolyte gel.

[0016] Note that when a cured product is obtained by polymerizing a composition containing an acrylic monomer as a main component, the resulting cured product is hard and inferior in flexibility due to the large number of reaction sites. When the cured product is used as an electrolyte gel to be incorporated in a lithium ion storage battery or the like, it is preferable that the cured product has flexibility because it is resistant to impact. The curable composition contains component (A), which is a vinyl polymer having a crosslinkable functional group. Therefore, the number of reaction sites can be controlled, and the resulting cured product is rubber-like and has flexibility.

[0017] [Component (A): a vinyl polymer having a crosslinkable functional group and an ether bond] The curable composition contains, as component (A), a vinyl polymer having a crosslinkable functional group and an ether bond. Various types of vinyl monomers can be used as the vinyl monomer constituting the main chain of the vinyl polymer.

[0018] The vinyl-based monomer constituting the main chain of the vinyl polymer preferably includes a vinyl-based monomer having an ether bond. Examples of the vinyl-based monomer having an ether bond include (meth)acrylate ester-based monomers having an ether bond. It can also be said that a (meth)acrylate ester-based monomer having an ether bond has both an ester bond and an ether bond. Examples of the (meth)acrylate ester-based monomer having an ether bond include methoxypolyethylene glycol (meth)acrylate, methoxypropylene glycol (meth)acrylate, methoxytriethylene glycol (meth)acrylate, 2-methoxyethyl (meth)acrylate, 3-methoxypropyl (meth)acrylate, 2-methoxybutyl (meth)acrylate, 2-ethylcarbitoloxy (meth)acrylate, and phenoxyethyl (meth)acrylate.

[0019] From the viewpoint of curability, the vinyl polymer preferably contains the ether bond in a side chain thereof. It can also be said that the vinyl polymer preferably has a side chain containing an ether bond. Further, the side chain containing an ether bond is preferably at least one selected from the group consisting of a methoxypolyethylene glycol group, a methoxypropylene glycol group, a methoxytriethylene glycol group, a methoxyethyl group, an ethylcarbitol group and a phenoxyethyl group.

[0020] Other usable vinyl monomers include, specifically, (meth)acrylic acid; methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, tert-butyl (meth)acrylate, n-pentyl (meth)acrylate, n-hexyl (meth)acrylate, cyclohexyl (meth)acrylate, n-heptyl (meth)acrylate, n-octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and (meth)acrylic acid. Nonyl lylate, decyl (meth)acrylate, dodecyl (meth)acrylate, phenyl (meth)acrylate, toluyl (meth)acrylate, benzyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, stearyl (meth)acrylate, glycidyl (meth)acrylate, 2-aminoethyl (meth)acrylate, γ-(methacryloyloxypropyl)trimethoxysilane, ethylene oxide adduct of (meth)acrylic acid, trifluoromethylmethyl (meth)acrylate, (meth)acrylic 2-Trifluoromethylethyl Acid, 2-Perfluoroethylethyl (meth)acrylate, 2-Perfluoroethyl-2-Perfluorobutylethyl (meth)acrylate, 2-Perfluoroethyl (meth)acrylate, perfluoromethyl (meth)acrylate, diperfluoromethylmethyl (meth)acrylate, 2-Perfluoromethyl-2-Perfluoroethylmethyl (meth)acrylate, 2-Perfluorohexylethyl (meth)acrylate, 2-Perfluorodecylethyl (meth)acrylate, 2-Perfluorohexadeci (Meth)acrylic acid ester monomers such as ethyl ethyl; styrene monomers such as styrene, vinyltoluene, α-methylstyrene, chlorostyrene, styrenesulfonic acid and its salts; fluorine-containing vinyl monomers such as perfluoroethylene, perfluoropropylene, and vinylidene fluoride; silicon-containing vinyl monomers such as vinyltrimethoxysilane and vinyltriethoxysilane; maleic anhydride, maleic acid, monoalkyl and dialkyl esters of maleic acid; fumaric acid, monoalkyl and dialkyl esters of fumaric acid;Examples include maleimide monomers such as maleimide, methyl maleimide, ethyl maleimide, propyl maleimide, butyl maleimide, hexyl maleimide, octyl maleimide, dodecyl maleimide, stearyl maleimide, phenyl maleimide, and cyclohexyl maleimide; nitrile group-containing vinyl monomers such as acrylonitrile and methacrylonitrile; amide group-containing vinyl monomers such as acrylamide and methacrylamide; vinyl esters such as vinyl acetate, vinyl propionate, vinyl pivalate, vinyl benzoate, and vinyl cinnamate; alkenes such as ethylene and propylene; conjugated dienes such as butadiene and isoprene; and vinyl chloride, vinylidene chloride, allyl chloride, and allyl alcohol.

[0021] These can be used individually or copolymerized. Here, (meth)acrylic acid refers to acrylic acid and / or methacrylic acid.

[0022] In order to dissolve an electrolyte in a curable composition at a high concentration without the presence of a solvent, the proportion of monomers having ether bonds in the vinyl polymer is preferably more than 30 mol%, more preferably 40 mol% to 100%, and even more preferably 50 mol% to 99%.

[0023] The main chain of the vinyl polymer is preferably a (meth)acrylic polymer because the product exhibits excellent physical properties such as flexibility, viscosity, and elongation at low temperatures. Specifically, the main chain of the vinyl polymer is preferably produced by polymerizing (meth)acrylic acid ester monomers, and more preferably by polymerizing acrylic acid ester monomers. Here, "primarily" means that 50 mol% or more of the monomer units constituting the vinyl polymer are (meth)acrylic acid ester monomers, and preferably 70 mol% or more are (meth)acrylic acid ester monomers.

[0024] Particularly preferred acrylic acid ester monomers include alkyl acrylate monomers, specifically ethyl acrylate, 2-methoxyethyl acrylate, stearyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, and 2-methoxybutyl acrylate. These preferred monomers may be copolymerized with other monomers, or even block copolymerized.

[0025] The molecular weight distribution of the vinyl polymer, i.e., the ratio of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn) (Mw / Mn) measured by gel permeation chromatography (GPC), is not particularly limited, but is preferably less than 1.8, more preferably 1.7 or less, even more preferably 1.6 or less, even more preferably 1.5 or less, particularly preferably 1.4 or less, and most preferably 1.3 or less. If the molecular weight distribution is too large, the viscosity at the same crosslinking point increases, making it difficult to handle. In this specification, GPC measurement is performed using chloroform as the mobile phase, the measurement is performed on a polystyrene gel column, and the number-average molecular weight, etc., can be determined in terms of polystyrene equivalent.

[0026] The number-average molecular weight of the vinyl polymer is not particularly limited, but when measured by GPC, it is preferably in the range of 500 to 1,000,000, more preferably 1,000 to 100,000, even more preferably 5,000 to 80,000, and even more preferably 8,000 to 50,000. If the molecular weight is too low, it becomes easy to handle with low viscosity, but the resulting cured product tends to have insufficient elongation and / or poor flexibility. On the other hand, if the molecular weight is too high, it tends to become difficult to handle.

[0027] From the viewpoint of the flexibility of the resulting cured product, the lower limit of the content of component (A) in 100% by weight of the curable composition is preferably 5% by weight or more, and more preferably 10% by weight or more. The upper limit of the content of component (A) in 100% by weight of the curable composition is less than 100% by weight, and from the viewpoint of ionic conductivity, it is preferably 50% by weight or less, and more preferably 30% by weight or less. Since component (B) in the curable composition has good compatibility with the resin component, it is also possible to reduce the addition ratio of component (A).

[0028] <Synthesis method for vinyl polymers> The vinyl polymer can be obtained by various polymerization methods. The polymerization method is not particularly limited, but radical polymerization is preferred in terms of monomer versatility and ease of control, and among radical polymerization methods, controlled radical polymerization is more preferred. This controlled radical polymerization method can be classified into "chain transfer agent method" and "living radical polymerization method". Living radical polymerization is even more preferred because it is easy to control the molecular weight and molecular weight distribution of the obtained vinyl polymer, and atom transfer radical polymerization is particularly preferred in terms of raw material availability and ease of introducing functional groups to the polymer ends. For each of these polymerization methods, see, for example, Japanese Patent Application Publication No. 2005-232419 and Japanese Patent Application Publication No. 2006-291073.

[0029] <Crosslinkable functional group> The crosslinkable functional group of the vinyl polymer is not particularly limited, but it is preferable that it be at least one selected from the group consisting of radical crosslinkable functional groups, epoxy groups, and hydrolyzable silyl groups, in terms of excellent storage stability and properties of the cured product after crosslinking.

[0030] When rubbery properties are particularly required for the cured product obtained by curing the aforementioned curable composition, it is preferable that at least one of the crosslinkable functional groups be located at the end of the molecular chain, in order to allow for a large molecular weight between crosslinking points, which greatly affects rubber elasticity. More preferably, the vinyl polymer has all of its crosslinkable functional groups at the ends of the molecular chain.

[0031] (Radical crosslinkable functional group) The radical crosslinkable functional group is not particularly limited, but examples include vinyl groups and (meth)acryloyl groups. When the crosslinkable functional group of the vinyl polymer is a radical crosslinkable functional group, the lower limit of the number of radical crosslinkable functional groups in the molecule of the vinyl polymer is preferably 1.0 or more on average per molecule, more preferably 1.2 or more, and even more preferably 1.4 or more. The upper limit of the number of radical crosslinkable functional groups is preferably 2 or less on average per molecule. If the number of radical crosslinkable functional groups is within the above range, the vinyl polymers are sufficiently crosslinked by the catalyst and initiator, and a cured product with sufficient strength can be obtained.

[0032] In one embodiment, the (meth)acryloyl group has a structure represented by the following general formula (1). -OC(O)C(R 5 )=CH2(1) In general formula (1), R 5 R is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms. The hydrocarbon group may optionally be substituted with one or more heteroatoms selected from the group consisting of oxygen, nitrogen, sulfur, fluorine, chlorine, bromine, and iodine atoms. 5 Specific examples include H, CH3, CH2CH3, (CH2) n Examples include CH3 (where n is an integer from 2 to 19), C6H5, CH2OH, CN, etc. (A) From the viewpoint of the reactivity of component R 5 H or CH3 is preferred.

[0033] One example of a method for introducing (meth)acryloyl groups into a polymer is the method described in paragraphs

[0081] to

[0090] of Japanese Patent No. 5536383.

[0034] (Epoxy group) In one embodiment, examples of the epoxy group include, but are not particularly limited to, a glycidyl group, a glycidyl ether group, a 3,4-epoxycyclohexyl group, an oxetane group, an aminoglycidyl group, a phenoxyglycidyl group, and the like. When the crosslinkable functional group of component (A) is an epoxy group, the lower limit of the average number of epoxy groups contained in one molecule of component (A) is preferably 1.0 or more per molecule, more preferably 1.4 or more, and still more preferably 2.0 or more. The upper limit of the number of epoxy groups is preferably 4.0 or less on average per molecule.

[0035] (Hydrolyzable silyl group) In one embodiment, examples of the hydrolyzable silyl group include groups represented by general formula (2). -[Si(R 1 ) 2-b (Y) b O] m -Si(R 2 ) 3-a (Y) a (2) In the formula, R 1 and R 2 are each an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, or a triorganosiloxy group represented by (R')3SiO- (where R' is a monovalent hydrocarbon group having 1 to 20 carbon atoms, and the three R' may be the same or different); when two or more R 1 or two or more R 2 are present, they may be the same or different. Y represents a hydroxyl group or a hydrolyzable group, and when two or more Y are present, they may be the same or different. a represents 0, 1, 2, or 3, and b represents 0, 1, or 2. m is an integer of 0 to 19; provided that the condition a + mb ≧ 1 is satisfied.

[0036] Examples of hydrolyzable groups include commonly used groups such as hydrogen atoms, alkoxy groups, acyloxy groups, ketoximate groups, amino groups, amide groups, aminooxy groups, mercapto groups, and alkenyloxy groups. Of these, alkoxy groups, amide groups, and aminooxy groups are preferred, with alkoxy groups being particularly preferred due to their mild hydrolysis and ease of handling. Among alkoxy groups, those with fewer carbon atoms are more reactive. That is, the reactivity decreases in the order of methoxy group > ethoxy group > propoxy group, and these can be selected according to the purpose and application.

[0037] Hydrolyzable groups or hydroxyl groups can be bonded to one silicon atom in the range of 1 to 3, and (a + Σb) is preferably in the range of 1 to 5. When two or more hydrolyzable groups or hydroxyl groups are bonded to a hydrolyzable silyl group, they may be the same or different. There is one or more silicon atoms forming the hydrolyzable silyl group, but in the case of silicon atoms linked by siloxane bonds, etc., it is preferable that there be 20 or fewer. In particular, hydrolyzable silyl groups represented by general formula (3) are preferred because they are readily available. -Si(R 2 ) 3-a (Y) a (3) (In the formula, R 2 (and Y is the same as above, and a is an integer from 1 to 3) While not particularly limited, a is preferably 2 or higher because it results in good curability and physical properties of the cured product.

[0038] Such vinyl polymers having hydrolyzable silyl groups often utilize polymers in which two hydrolyzable groups are bonded to each silicon atom. However, when used at low temperatures, or when a very fast curing rate is required, the curing rate is insufficient. Furthermore, if flexibility after curing is desired, the crosslinking density must be reduced, which can lead to stickiness (surface tack) due to insufficient crosslinking density. In such cases, it is preferable to use a group with a value of 3 (e.g., a trimethoxy functional group).

[0039] Furthermore, while groups with a value of 3 (e.g., trimethoxy functional group) harden faster than groups with a value of 2 (e.g., dimethoxy functional group), groups with a value of 2 may have superior storage stability and mechanical properties (e.g., elongation). To balance hardening and physical properties, groups with a value of 2 (e.g., dimethoxy functional group) and groups with a value of 3 (e.g., trimethoxy functional group) may be used in combination.

[0040] For example, when Y is the same, the more a there is, the higher the reactivity of Y. Therefore, by selecting various values ​​of Y and a, it is possible to control the curability and the mechanical properties of the cured product, and the selection can be made according to the purpose and application. In addition, when a is 1, it can be used as a chain extender by mixing with at least one polymer having a hydrolyzable silyl group, specifically a polymer consisting of polysiloxane, polyoxypropylene, or polyisobutylene. It is possible to obtain a composition that has low viscosity before curing, high elongation at break, low bleeding, and low surface contamination after curing.

[0041] The number of hydrolyzable silyl groups in component (A) is not particularly limited, but from the viewpoint of the curability of the composition and the physical properties of the cured product, it is preferable to have an average of one or more per molecule, more preferably 1.1 to 4.0, and even more preferably 1.2 to 3.5.

[0042] Known methods can be used to introduce hydrolyzable silyl groups into vinyl polymers. For example, the method described in paragraphs

[0083] to

[0117] of Japanese Patent Publication No. 2007-302749 can be used. Methods for producing vinyl polymers having hydrolyzable silyl groups at the molecular chain ends, particularly (meth)acrylic polymers, are disclosed in Japanese Patent Publication No. 3-14068, Japanese Patent Publication No. 4-55444, Japanese Patent Publication No. 6-211922, etc.

[0043] (Other resins) (A) Component can be used alone or in combination with other resins, but other resins may be used in combination.

[0044] [(B) Component: Diester phosphate] The curable composition contains a phosphate diester as component (B). This allows component (D) to be dissolved in the curable composition, thereby ensuring the ionic conductivity of the resulting electrolyte gel.

[0045] Examples of phosphate diesters include dimethyl phosphate, dibutyl phosphate, di-2-ethylhexyl phosphate, diisodecyl phosphate, dibutoxyethyl acid phosphate, diisotridecyl acid phosphate, dioleyl acid phosphate, diethylene glycol acid phosphate, diphenyl phosphate, and dibenzyl phosphate. The curable composition only needs to contain at least a phosphate diester. The curable composition may or may not further contain phosphate and / or phosphate esters other than phosphate diesters (phosphate monoesters, phosphate triesters).

[0046] Specific examples of phosphate esters other than the phosphates and / or phosphate diesters mentioned above include phosphoric anhydride, monobutyl phosphate, monoisodecyl phosphate, tributyl phosphate, tris(2-ethylhexyl) phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, 2-ethylhexyl diphenyl phosphate, cresyl diphenyl phosphate, cresyl di2,6-xylenyl phosphate, tris(chloropropyl) phosphate, and the like.

[0047] The curable composition may contain a mixture containing a phosphate diester. That is, a mixture containing a phosphate diester may be used as a source of phosphate diester. In this specification, a mixture containing a phosphate diester means a mixture that may contain phosphoric acid, phosphate monoester and / or phosphate triester in addition to a phosphate diester. Examples of such mixtures containing a phosphate diester include methyl acid phosphate, butyl acid phosphate, 2-ethylhexyl acid phosphate, isodecyl acid phosphate, etc. Alternatively, although phosphate diester is listed as the main component, commercially available products that may also contain phosphoric acid and / or phosphate esters other than phosphate diester can be used. The content of phosphate diester in 100% by weight of such a mixture may be, for example, 5% by weight or more, 30% by weight or more, or 50% by weight or more.

[0048] From the viewpoint of applicability, the content of component (B) in the curable composition is preferably 5 to 1000 parts by weight, more preferably 10 to 500 parts by weight, and even more preferably 20 to 400 parts by weight, per 100 parts by weight of component (A).

[0049] [(C) Ingredient: Initiator] The curable composition contains an initiator as component (C). Component (C) is not particularly limited, but radical initiators and / or redox initiators are preferred from the viewpoint of curability. In one embodiment, component (C) is a radical initiator. Examples of radical initiators include thermal radical initiators and photoradical initiators.

[0050] Organic peroxides can be used as thermal radical initiators. Specific examples include hydroperoxides, dialkylperoxides, peroxycarboxylic acids, peroxyesters, diacylperoxides, peroxycarbonates, ketone peroxides, and peroxyketals. From the viewpoint of curability and storage stability, peroxyesters, peroxycarbonates, ketone peroxides, and peroxyketals are preferred, with peroxyesters and peroxycarbonates being particularly preferred. Examples of peroxyesters include t-butylperoxy-2-ethylhexanoate, t-hexylperoxy-2-ethylhexanoate, and t-butylperoxybenzoate.

[0051] In addition to organic peroxides, azo-based initiators can also be used as thermal radical initiators. Specific examples include azobisisobutyronitrile and dimethylazobisisobutyrate.

[0052] From the viewpoint of curability and storage stability, the content of the thermal radical initiator in the curable composition is preferably 0.1 to 20 parts by weight, more preferably 0.5 to 15 parts by weight, and even more preferably 1 to 10 parts by weight, per 100 parts by weight of component (A).

[0053] (C) When component C is to function as an initiator of an oxidation-reduction system, it is necessary to use a reducing agent in addition to the organic peroxide mentioned above. There are no particular limitations on the type of reducing agent, and ordinary reducing agents can be used. Specific examples of reducing agents include sulfinic acid, organic amines, and transition metal salts. Examples of organic amines include azo compounds such as p-toluidine (p-methylaniline); azo compounds such as azoisobutyrate dinitrile; α-aminosulfones such as bis-(tolylsulfonemethyl)amine, bis-(tolylsulfonemethyl)ethylamine, and bis-(tolylsulfonemethyl)-benzylamine; tertiary amines such as diisopropyl-p-toluidine, dimethylaniline, and dimethyl-p-toluidine; amine-aldehyde condensation products, such as condensation products of primary amines such as aniline or butylamine and aliphatic aldehydes such as butyraldehyde; and thiourea derivatives such as 2-mercaptobenzimidazole, methylthiourea, dibutylthiourea, tetramethylthiourea, and ethylenethiourea. Examples of transition metal salts include cobalt naphthenate, copper naphthenate, and vanadylacetylacetonate. Among these, organic amines and transition metal salts are preferred in terms of reactivity, with p-toluidine and vanadylacetylacetonate being more preferred. Organic amines are particularly preferred from the viewpoint of curability, storage stability, and influence on ionic conductivity.

[0054] When an oxidation-reduction initiator is used as component (C), from the viewpoint of curability and storage stability, the content of the reducing agent in the curable composition is preferably 0.01 to 20 parts by weight, more preferably 0.05 to 10 parts by weight, and even more preferably 0.1 to 5 parts by weight, per 100 parts by weight of component (A).

[0055] Examples of photoradical initiators include acetophenone, propiophenone, benzophenone, xanthol, fluorein, benzaldehyde, anthraquinone, triphenylamine, carbazole, 3-methylacetophenone, 4-methylacetophenone, 3-pentylacetophenone, 2,2-diethoxyacetophenone, 4-methoxyacetophenone, 3-bromoacetophenone, 4-allylacetophenone, p-diacetylbenzene, 3-methoxybenzophenone, 4-methylbenzophenone, 4-chlorobenzophenone, 4,4'-dimethoxybenzophenone, 4-chloro-4'-benzylbenzophenone, and 3-chloroxantone. Examples include 3,9-dichloroxantone, 3-chloro-8-nonylxantone, benzoyl, benzoin methyl ether, benzoin butyl ether, bis(4-dimethylaminophenyl)ketone, benzyl methoxyketal, 2-chlorothioxantone, 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one, and 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone-1.

[0056] Furthermore, acylphosphine oxide-based photopolymerization initiators are another example of photoradical initiators. Acylphosphine oxide-based photopolymerization initiators are preferred because they exhibit excellent deep curing properties when irradiated with UV light. Specific examples of acylphosphine oxide-based photopolymerization initiators include 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, bis(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentylphosphine oxide, bis(2,6-dimethylbenzoyl)-phenylphosphine oxide, bis(2,4,6-trimethylbenzoyl)-isobutylphosphine oxide, bis(2,6-dimethoxybenzoyl)-isobutylphosphine oxide, and bis(2,6-dimethoxybenzoyl)-phenylphosphine oxide. Among these, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, and bis(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentylphosphine oxide are preferred.

[0057] Among the photoradical initiators mentioned above, 1-hydroxycyclohexyl-phenyl-ketone, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 2,2-dimethoxy-1,2-diphenylethane-1-one, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide are preferred due to their high reactivity. In one embodiment, the curable composition contains both acylphosphine oxide and phenyl ketone compounds.

[0058] From the viewpoint of curability and storage stability, the content of the photoradical initiator in the curable composition is preferably 0.01 to 20 parts by weight, more preferably 0.05 to 15 parts by weight, and even more preferably 0.1 to 10 parts by weight, per 100 parts by weight of component (A).

[0059] [(D) Component: Electrolyte] The curable composition contains an electrolytic substance as component (D). There are no particular limitations on component (D), and any ordinary electrolytic substance can be used. Component (D) may be an electron pair compound of a fluorine atom-containing anion and a lithium cation. There are no particular limitations on the electron pair compound of a fluorine atom-containing anion and a lithium cation, but specific examples include lithium hexafluorophosphate, LiPF3(CF2CF3)3, bis(trifluoromethanesulfonyl)imide lithium, bis(perfluoroethanesulfonyl)imide lithium, (fluorosulfonyl)(nonafluorobutanesulfonyl)imide lithium, bis(fluorosulfonyl)imide lithium, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium trifluoromethanesulfonate, tris(trifluoromethanesulfonyl)methidolithium, bis(oxalato)borate lithium, and difluoro(oxalato)borate lithium. Among these, lithium hexafluorophosphate and bis(trifluoromethanesulfonyl)imide lithium are preferred in terms of stability and ionic conductivity. Other possible components for (D) include 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide, N-(2-methoxyethyl)-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide, and methyltrioctylammonium bis(trifluoromethylsulfonyl)imide.

[0060] From the viewpoint of viscosity and ionic conductivity of the curable composition, the content of component (D) in the curable composition is preferably 10 to 1000 parts by weight, more preferably 50 to 800 parts by weight, and even more preferably 100 to 700 parts by weight, per 100 parts by weight of component (A).

[0061] As described above, the curable composition can dissolve component (D) at a high concentration. The content of component (D) in 100% by weight of the curable composition may be 20% by weight or more, 30% by weight or more, 40% by weight or more, or 50% by weight or more.

[0062] [(E) Component: Radical-reactive monomer] The curable composition may further contain a radical-reactive monomer as component (E) from the viewpoint of viscosity adjustment, adjustment of the mechanical properties of the cured product, compatibility with electrolytes, etc. Component (E) is not particularly limited, but specific examples include (meth)acrylic acid; methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, tert-butyl (meth)acrylate, n-pentyl (meth)acrylate, n-hexyl (meth)acrylate, cyclohexyl (meth)acrylate, n-heptyl (meth)acrylate, n-octyl (meth)acrylate, (meth ) 2-ethylhexyl acrylate, nonyl (meth)acrylate, decyl (meth)acrylate, dodecyl (meth)acrylate, phenyl (meth)acrylate, toluyl (meth)acrylate, benzyl (meth)acrylate, 2-methoxyethyl (meth)acrylate, 3-methoxypropyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, stearyl (meth)acrylate, glycymethyl (meth)acrylate (Meth)acrylic acid ester monomers such as zyl, 2-aminoethyl (meth)acrylate, phenoxyethyl (meth)acrylate, γ-(methacryloyloxypropyl)trimethoxysilane, ethylene oxide adducts of (meth)acrylic acid, trifluoromethylmethyl (meth)acrylate, 2-trifluoromethylethyl (meth)acrylate, 2-perfluoroethylethyl (meth)acrylate, 2-perfluoroethyl-2-perfluorobutylethyl (meth)acrylate, 2-perfluoroethyl (meth)acrylate, perfluoromethyl (meth)acrylate, diperfluoromethylmethyl (meth)acrylate, 2-perfluoromethyl-2-perfluoroethylmethyl (meth)acrylate, 2-perfluorohexylethyl (meth)acrylate, 2-perfluorodecylethyl (meth)acrylate, and 2-perfluorohexadecylethyl (meth)acrylate; styrene monomers such as styrene, vinyltoluene, α-methylstyrene, chlorostyrene, styrene sulfonic acid and its salts;Fluorine-containing vinyl monomers such as perfluoroethylene, perfluoropropylene, and vinylidene fluoride; silicon-containing vinyl monomers such as vinyltrimethoxysilane and vinyltriethoxysilane; maleic anhydride, maleic acid, and monoalkyl and dialkyl esters of maleic acid; fumaric acid, and monoalkyl and dialkyl esters of fumaric acid; maleimide monomers such as maleimide, methyl maleimide, ethyl maleimide, propyl maleimide, butyl maleimide, hexyl maleimide, octyl maleimide, dodecyl maleimide, stearyl maleimide, phenyl maleimide, and cyclohexyl maleimide; nitriles such as acrylonitrile and methacrylonitrile. Examples include vinyl monomers containing amide groups; acrylamides, amino monomers; vinyl monomers containing amide groups such as dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate, acrylic morpholine, and methacrylamide; vinyl esters such as vinyl acetate, vinyl propionate, vinyl pivalate, vinyl benzoate, and vinyl cinnamate; alkenes such as ethylene and propylene; conjugated dienes such as butadiene and isoprene; vinyl chloride, vinylidene chloride, allyl chloride, allyl alcohol, (2-oxo-1,3-dioxolan-4-yl)methyl (meth)acrylate, vinylethylene carbonate, and polyethylene glycol monoacrylate. In terms of viscosity and solubility in electrolytes, 4-hydroxybutyl (meth)acrylate (i.e., 4-hydroxybutyl (meth)acrylate), acrylic morpholine, allyl alcohol, (2-oxo-1,3-dioxolan-4-yl)methyl (meth)acrylate, and vinyl ethylene carbonate are preferred as curable compositions.

[0063] From the viewpoint of viscosity, curability, and flexibility of the cured product of the curable composition, the content of component (E) in the curable composition is preferably 1 to 100 parts by weight, more preferably 2 to 80 parts by weight, and even more preferably 3 to 70 parts by weight, per 100 parts by weight of component (A).

[0064] [Other ingredients] The curable composition may contain other components in addition to components (A), (B), (C), (D), and (E). These other components may be used individually or in combination of two or more. Examples of these other components are described below.

[0065] <Leveling agent> The curable composition may contain a leveling agent to adjust the surface irregularities after curing. Examples of leveling agents include fluorine-based, silicone-based, acrylic-based, ether-based, or ester-based leveling agents.

[0066] <Antifoaming agent> The curable composition may contain an antifoaming agent to prevent the generation of bubbles. Preferred examples include acrylic, silicone, or fluorine-based antifoaming agents.

[0067] <Adhesion-enhancing agent> The curable composition may contain an adhesion promoter to improve adhesion to the substrate. Preferred adhesion promoters include crosslinkable silyl group-containing compounds and vinyl monomers having polar groups, and even more preferably silane coupling agents and vinyl monomers containing acidic groups.

[0068] As a silane coupling agent, for example, a silane coupling agent can be used that has both a functional group containing atoms other than carbon and hydrogen atoms in its molecule and a crosslinkable silyl group. Examples of functional groups containing atoms other than carbon and hydrogen atoms include epoxy groups, isocyanate groups, isocyanurate groups, carbamate groups, amino groups, mercapto groups, carboxyl groups, halogeno groups, and (meth)acrylic groups.

[0069] <Filler> The curable composition may contain a filler to ensure a certain level of strength. The filler is not particularly limited, but silica other than fumed silica (e.g., crystalline silica, fused silica, hydrated silica), dolomite, carbon black, titanium oxide, or activated zinc oxide are preferred from the viewpoint of improving the packing rate with a small amount. In particular, if a cured product with high strength is to be obtained with these fillers, it is preferable to use at least one filler selected mainly from crystalline silica, fused silica, hydrated silica, carbon black, or activated zinc oxide.

[0070] <Plasticizer> The curable composition may contain plasticizers to adjust viscosity, slump, or mechanical properties such as hardness, tensile strength, or elongation after curing. Examples of plasticizers include phthalate ester compounds such as dibutyl phthalate, diisononyl phthalate (DINP), diheptyl phthalate, di(2-ethylhexyl) phthalate, diisodecyl phthalate (DIDP), and butyl benzyl phthalate; terephthalate ester compounds such as bis(2-ethylhexyl)-1,4-benzenedicarboxylate (e.g., EASTMAN 168 (manufactured by EASTMAN CHEMICAL)); and 1,2-cyclohexanedicarboxylic acid diisononyl ester (e.g., Hexamoll Examples include non-phthalate ester compounds such as DINCH (manufactured by BASF); aliphatic polycarboxylic acid ester compounds such as dioctyl adipate, dioctyl sebacate, dibutyl sebacate, diisodecyl succinate, and tributyl acetylcitrate; unsaturated fatty acid ester compounds such as butyl oleate and methyl acetylricinoleate; alkyl sulfonate phenyl esters (Mesamoll (manufactured by LANXESS)); phosphate ester compounds such as tricresyl phosphate and tributyl phosphate; trimellitic acid ester compounds; chlorinated paraffin; hydrocarbon oils such as alkyldiphenyl and partially hydrogenated terphenyl; process oils; and epoxy plasticizers such as epoxidized soybean oil and benzyl epoxy stearate.

[0071] [Method for producing a curable composition] The method for producing the curable composition preferably includes the steps of: (I) mixing component (B) and component (D); (II) mixing component (A) into the solution obtained in step (I); and (III) mixing component (C) into the solution obtained in step (II).

[0072] First, in step (I), a homogeneous electrolyte solution can be obtained by adding component (B) to component (D), or by adding component (D) to component (B) and mixing and stirring. In step (I), it can also be said that component (D) is dispersed and dissolved in component (B). Then, in step (II), component (A) is added to the solution obtained in step (I) and further mixed and stirred. Here, it is preferable to completely dissolve component (D). Finally, in step (III), component (C) is added to the solution obtained in step (II) and mixed and stirred. After that, component (E) and other components may be added.

[0073] The above manufacturing method can be carried out at room temperature, but it is preferable to carry it out for a short time while heating in order to suppress the incorporation of moisture. Specifically, the heating temperature should be between 50°C and 300°C, preferably between 60°C and 200°C, and more preferably between 70°C and 150°C.

[0074] Examples of equipment used for mixing include agitation and defoaming devices such as three-roll mills and planetary mixers. These devices can be used individually or in combination.

[0075] [2. Electrolyte Gel] An electrolyte gel according to one embodiment of the present invention is obtained by curing the above-described curable composition. That is, the electrolyte gel contains the above-described components (A) to (D), and components (E) and other components may be optionally added. The electrolyte gel may also be referred to as a gel-like electrolyte, polymer electrolyte, or electrolytic layer gel.

[0076] The curing composition can be cured by leaving it at room temperature, but it may also be cured by light irradiation, heating, and / or contact with moisture. Light and electron beams can be used for curing by light irradiation. Examples of light and / or electron beam sources include high-pressure mercury lamps, low-pressure mercury lamps, electron beam irradiation devices, halogen lamps, light-emitting diodes, semiconductor lasers, and metal halides. The temperature for curing by light irradiation is preferably 0 to 150°C, and more preferably 5 to 120°C. The temperature for curing by heating is preferably 50 to 150°C, and more preferably 70 to 100°C. The relative humidity for curing by contact with moisture is preferably 5 to 95%, and more preferably 10 to 80%.

[0077] [3. Storage Batteries and Electronic Devices] One embodiment of the present invention also includes a battery equipped with the electrolyte gel described above. The battery may have an electrolyte gel between the positive electrode and the negative electrode. The battery may or may not have a separator between the positive electrode and the negative electrode in addition to the electrolyte gel. Examples of such batteries include lithium-ion batteries, nickel-metal hydride batteries, NAS batteries, and the like.

[0078] Furthermore, one embodiment of the present invention also includes an electronic device comprising the electrolyte gel described above. Examples of such electronic devices include dimmable panels, dye-sensitized solar cells, sensors, actuators, and optoelectronic devices.

[0079] The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[0080] One embodiment of the present invention may include the following configuration: <1> A curable composition for electrolyte gels comprising: (A) component: a vinyl polymer having a crosslinkable functional group and an ether bond; (B) component: a phosphate diester; (C) component: an initiator; and (D) component: an electrolytic substance. <2> The aforementioned component (A) contains the ether bond in its side chain. <1> A curable composition for electrolyte gels as described above. <3> The side chain containing the ether bond is at least one selected from the group consisting of a methoxypolyethylene glycol group, a methoxypropylene glycol group, a methoxytriethylene glycol group, a methoxyethyl group, an ethyl carbitol group, and a phenoxyethyl group. <2> A curable composition for electrolyte gels as described above. <4> The polymerization ratio of the monomer having an ether bond in component (A) is greater than 30 mol%, <1> ~ <3> A curable composition for electrolyte gels as described in any one of the following. <5> The crosslinkable functional group of component (A) is at least one selected from the group consisting of radical crosslinkable functional groups, epoxy groups, and hydrolyzable silyl groups. <1> ~ <4> A curable composition for electrolyte gels as described in any one of the following. <6> The main chain of component (A) is a (meth)acrylic polymer. <1> ~ <5> A curable composition for electrolyte gels as described in any one of the following. <7> (C) Component is a radical initiator. <1> ~ <6> A curable composition for electrolyte gels as described in any one of the following. <8> The aforementioned component (D) is an electron pair compound of a fluorine atom-containing anion and a lithium cation. <1> ~ <7> A curable composition for electrolyte gels as described in any one of the following. <9> The content of component (D) in 100% by weight of the curable composition for electrolyte gel is 20% by weight or more. <1> ~ <8> A curable composition for electrolyte gels as described in any one of the following. <10> <1> ~ <9> An electrolyte gel obtained by curing one of the curable compositions for electrolyte gels described in any one of the above. <11> <10> A storage battery comprising the electrolyte gel described above. <12> <10> An electronic device comprising the electrolyte gel described above. <13> A method for producing a curable composition for an electrolyte gel, comprising: (A) component: a vinyl polymer having a crosslinkable functional group and an ether bond; (B) component: a phosphate diester; (C) component: an initiator; and (D) component: an electrolytic substance, the method comprising: (I) a step of mixing component (B) and component (D); (II) a step of mixing component (A) into the solution obtained in step (I); and (III) a step of mixing component (C) into the solution obtained in step (II).

[0081] The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Examples]

[0082] The present invention will be described in detail below with reference to examples, but it is not limited to these examples. Unless otherwise specified, "%" hereafter refers to "weight%".

[0083] [Evaluation Method] [UV curability] The condition of the resulting cured sheet was observed and evaluated as follows. ○ (Good): A cured product that retains its shape is obtained, and no bleeding material is observed on the surface of the cured product. × (Defective): A cured product that can retain its shape is not obtained, or even if a cured product that can retain its shape is obtained, bleeding material is observed on the surface of the cured product.

[0084] [Resistance value of hardened material] The obtained cured sheet was tested using a tester (3200 Count W / Bargraph MCD008, manufactured by Multi Measuring Instruments Co., Ltd.) to measure the resistance between the gauge marks (5 cm length).

[0085] [Flexibility of hardened material] The rubber hardness of the cured sheet was measured under a load of 1 kg using the hardness test described in JIS K 7312.

[0086] [Flame retardant] The resulting hardened sheet was exposed to a lighter flame, and the presence or absence of ignition and its state were observed.

[0087] [Electrolyte gel for lithium-ion batteries] [Materials used in the examples and comparative examples] ●(A) component • RC-P(MEA) (Having a radically crosslinkable functional group: A radical-curable telechelic polyacrylate with a main chain skeleton composed solely of 2-methoxyethyl acrylate, manufactured by Kaneka Corporation, number average molecular weight 6,000, molecular weight distribution 1.1, with methoxyethyl groups as side chains) • MM200C (a polyacrylate obtained by copolymerizing 2-methoxyethyl acrylate / n-butyl acrylate / ethyl acrylate in a molar ratio of 94 / 3 / 3, with a radical crosslinkable functional group introduced to one end of the main chain; manufactured by Kaneka Corporation; molecular weight 3,000; molecular weight distribution 1.1; having methoxyethyl groups as side chains) ●(B) Component AP-8 (2-ethylhexyl acid phosphate, manufactured by Daihachi Chemical Industry Co., Ltd., containing approximately 40-50% monoester, approximately 50-60% diester, and less than 1% triester) • DP-4 (Dibutyl phosphate, manufactured by Daihachi Chemical Industry Co., Ltd., containing approximately 19% monoester, 60% diester, and 19.5% triester) ●(C) component • Omnirad1173 (2-hydroxy-2-methyl-1-phenylpropan-1-one, manufactured by BASF) • Omnirad819 (bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, manufactured by BASF) ●(D) Component • Bis(trifluoromethanesulfonyl)imide lithium (LiTFSI) ● Polymers other than component (A) • Ebecryl 11 (PEO chain diacrylate, manufactured by Daicel Ornex Co., Ltd.) ●(B) Component other than phosphate esters • Tricresyl phosphate (TCP, phosphate triester) [Examples 1-4] In a container, component (B) was mixed with component (D) in the amounts listed in Table 1, and the mixture was stirred with a spatula to dissolve component (D). The mixture was then heated at 100°C for 1 hour to promote dissolution. Furthermore, component (A) was added to the container, stirred with a spatula, and then held at 100°C for 30 minutes to completely dissolve component (D). Finally, component (C) was added and mixed with a spatula to completely dissolve it, obtaining a curable composition for electrolyte gel. The obtained curable composition for electrolyte gel was poured into a mold of a predetermined size and cured using UV light (using a high-pressure mercury lamp, cumulative light intensity = 1866 mJ / cm²). 2 A 1mm thick cured sheet was obtained.

[0088] [Comparative Example 1] A curable composition for electrolyte gels and a cured sheet were obtained in the same manner as in Example 2, except that Ebecryl11, a polymer in which a radically crosslinkable functional group is introduced at the end of the polyethylene oxide (PEO) main chain, was used instead of component (A).

[0089] [Comparative Example 2] A curable composition for electrolyte gels was prepared in the same manner as in Example 1, except that tricresyl phosphate was used as a triester-type phosphate ester instead of component (B).

[0090] [Evaluation Results] The compositions and evaluation results of the examples and comparative examples are shown in Table 1 below.

[0091] [Table 1]

[0092] (Solubility of electrolytic substances) The curable composition for electrolyte gel in Comparative Example 2 used a triester-type substance as the phosphate ester, and therefore could not dissolve the electrolyte at high concentrations.

[0093] (UV curable) In Examples 1-4, a cured product with a uniform composition and no bleed material on the surface was obtained, whereas in Comparative Example 1, bleed material, presumably component (B), was observed. In other words, in Comparative Example 1, a tendency for component separation was observed.

[0094] (Resistance value of hardened material) Comparative Example 1, in which component (A) was not added, showed a higher resistance value compared to Examples 1-4.

[0095] (Flexibility of the hardened material) The hardness of the cured product in Comparative Example 1 was higher compared to Examples 1-4, and the electrolyte gel was less flexible.

[0096] (Flame retardant) In Examples 1-4 and Comparative Example 1, there was no ignition or spread of fire. In this specification, "no ignition or spread of fire" means "no ignition" and / or "no spread of fire."

[0097] (Overall assessment) It was found that when a vinyl polymer having crosslinkable functional groups and ether bonds is used as component (A) and a phosphate diester is used as component (B), the electrolyte (D) can be blended at a high filler content of 50% by weight or more without using organic solvents. Even in such cases, it was found that a highly flexible and uniform electrolyte gel can be obtained, and low resistance can be achieved. The obtained electrolyte gel also exhibited excellent flame retardancy. When the obtained electrolyte gel is implemented in a lithium-ion battery, it is expected to exhibit excellent charge / discharge performance and durability. [Industrial applicability]

[0098] One aspect of the present invention can be used, for example, in storage batteries and electronic devices.

Claims

1. A curable composition for electrolyte gels comprising: (A) component: a vinyl polymer having a crosslinkable functional group and an ether bond; (B) component: a phosphate diester; (C) component: an initiator; and (D) component: an electrolytic substance.

2. The curable composition for electrolyte gels according to claim 1, wherein component (A) contains the ether bond in its side chain.

3. The curable composition for electrolyte gels according to claim 2, wherein the side chain containing the ether bond is at least one selected from the group consisting of a methoxypolyethylene glycol group, a methoxypropylene glycol group, a methoxytriethylene glycol group, a methoxyethyl group, an ethyl carbitol group, and a phenoxyethyl group.

4. The curable composition for electrolyte gels according to claim 1, wherein the polymerization ratio of the monomer having an ether bond in component (A) is greater than 30 mol%.

5. The curable composition for electrolyte gels according to claim 1, wherein the crosslinkable functional group of component (A) is at least one selected from the group consisting of radical crosslinkable functional groups, epoxy groups, and hydrolyzable silyl groups.

6. The curable composition for electrolyte gels according to claim 1, wherein the main chain of component (A) is a (meth)acrylic polymer.

7. The curable composition for electrolyte gels according to claim 1, wherein component (C) is a radical initiator.

8. The curable composition for electrolyte gels according to claim 1, wherein component (D) is an electron pair compound of a fluorine atom-containing anion and a lithium cation.

9. The electrolyte gel curable composition according to claim 1, wherein the content of component (D) in 100% by weight of the electrolyte gel curable composition is 20% by weight or more.

10. An electrolyte gel obtained by curing a curable composition for electrolyte gels according to any one of claims 1 to 9.

11. A storage battery comprising the electrolyte gel described in claim 10.

12. An electronic device comprising the electrolyte gel described in claim 10.

13. A method for producing a curable composition for an electrolyte gel, comprising: (A) component: a vinyl polymer having a crosslinkable functional group and an ether bond; (B) component: a phosphate diester; (C) component: an initiator; and (D) component: an electrolytic substance, Step (I) of mixing component (B) and component (D), Step (II) involves mixing the solution obtained in step (I) with component (A), A method for producing a curable composition for an electrolyte gel, comprising the step (III) of mixing the solution obtained in step (II) with component (C).

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