Non-aqueous electrolyte and non-aqueous electrolyte battery

Abstract

Provided are: a non-aqueous electrolyte solution containing (I) a compound represented by general formula (1) described in the description; (II) at least one compound selected from the group consisting of compounds (2)-(5) described in the description; (III) a solute; and (IV) a non-aqueous organic solvent;

Description

Technical Field

[0001] This application relates to non-aqueous electrolytes and non-aqueous electrolyte batteries. Background Technology

[0002] In recent years, in addition to energy storage systems for small, high-energy-density applications such as information-related devices and communication equipment (personal computers, cameras, digital cameras, mobile phones, and smartphones), the demand for high-capacity, high-output, and high-energy-density batteries that can be used as auxiliary power sources for electric vehicles, hybrid vehicles, and fuel cell vehicles has expanded dramatically. Furthermore, even in large-scale, power-related energy storage systems, the demand for batteries capable of long-term operation is increasing. As a candidate for these various energy storage systems, non-aqueous electrolyte batteries, such as lithium-ion batteries, are being actively developed. Non-aqueous electrolyte batteries typically consist of a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte.

[0003] Patent document 1 proposes a scheme to improve charge-discharge efficiency and cycle characteristics by using sulfonic anhydride in the electrolyte.

[0004] Patent document 2 proposes a scheme to improve cycle characteristics and low-temperature characteristics by using silicon compounds in the electrolyte.

[0005] Patent document 3 proposes a scheme to improve preservation characteristics by using a non-aqueous electrolyte containing lithium difluorosulfonyl imide as a solute.

[0006] Patent document 4 proposes a scheme to suppress self-discharge and improve the storage characteristics after charging by using lithium monofluorophosphate and lithium difluorophosphate in the electrolyte.

[0007] Patent document 5 proposes a scheme to maintain high input / output characteristics and impedance characteristics even after durability testing by using a non-aqueous electrolyte containing fluorosulfonate.

[0008] Patent document 6 proposes a scheme to suppress the decomposition of the carbon anode that occurs during charge-discharge cycles by using a non-aqueous electrolyte containing cyclic sulfates.

[0009] Existing technical documents Patent documents Patent Document 1: Japanese Patent No. 4379567 Patent Document 2: Japanese Patent No. 3497812 Patent Document 3: Japanese Patent No. 4847675 Patent Document 4: Japanese Patent No. 3439085 Patent Document 5: Japanese Patent No. 5353923 Patent Document 6: Japanese Patent No. 3760540 Summary of the Invention

[0010] (a) Technical problems to be solved As mentioned above, Patent Document 1 proposes to improve the charge-discharge efficiency and cycle characteristics of a secondary battery by using an electrolyte containing sulfonic anhydride. However, through the research of the inventors of this application, it has been found that the secondary battery described in Patent Document 1 has the problem of high initial resistance.

[0011] This application was made in view of the above circumstances, and its purpose is to provide a non-aqueous electrolyte that can reduce the initial resistance of a non-aqueous electrolyte battery, and a non-aqueous electrolyte battery with low initial resistance.

[0012] (II) Technical Solution To address the aforementioned problems, the inventors of this application conducted thorough research and discovered that by including specific sulfonic anhydride and specific compounds in a non-aqueous electrolyte containing a non-aqueous organic solvent and solute, a non-aqueous electrolyte battery with low initial resistance can be provided. Specifically, the above-mentioned technical problems can be solved through the following configuration.

[0013] [1] A non-aqueous electrolyte containing: (I) The compounds represented by the following general formula (1), (II) Select at least one compound from the group consisting of compounds (2) to (5) below. (III) Solute, and (IV) Non-aqueous organic solvents [Chemical Formula 1] In general formula (1), R 1 The alkylene group refers to an alkylene group having 1 to 6 carbon atoms, wherein oxygen atoms are optionally present between the carbon-carbon bonds in the alkylene group, and furthermore, any hydrogen atom in the alkylene group is optionally substituted with a halogen atom. Compound (2): at least one compound selected from the group consisting of compounds represented by general formula (2-A), compounds represented by general formula (2-B), and compounds represented by general formula (2-C). [Chemical Formula 2] In general formula (2-A), R 21 and R 22Each of these groups independently represents an organic group or fluorine atom selected from the group consisting of alkoxy groups with 1 to 10 carbon atoms, alkenoxy groups with 2 to 10 carbon atoms, alkynoxy groups with 2 to 10 carbon atoms, cycloalkoxy groups with 3 to 10 carbon atoms, cycloalkenoxy groups with 3 to 10 carbon atoms, and aryloxy groups with 6 to 10 carbon atoms, wherein any hydrogen atom in the organic group is optionally replaced by a fluorine atom, and an oxygen atom is optionally present between the carbon-carbon bonds in the organic group. M1 m＋ The cation can be a proton, a metal cation, or an onium cation, where m represents the valence of the corresponding cation. Compounds represented by general formula (2-A) contain at least one PF bond. In general formula (2-B), X 21 The term "organic group" or "fluorine atom" is selected from the group consisting of alkyl (1-10 carbon atoms), alkenyl (2-10 carbon atoms), alkynyl (2-10 carbon atoms), cycloalkyl (3-10 carbon atoms), cycloalkenyl (3-10 carbon atoms), aryl (6-10 carbon atoms), alkoxy (1-10 carbon atoms), alkenyloxy (2-10 carbon atoms), alkynyloxy (2-10 carbon atoms), cycloalkoxy (3-10 carbon atoms), cycloalkenyloxy (3-10 carbon atoms), and aryloxy (6-10 carbon atoms), wherein any hydrogen atom in the organic group is optionally replaced by a fluorine atom, and an oxygen atom is optionally present between the carbon-carbon bonds in the organic group, wherein the organic group contains at least one fluorine atom. M1 m＋ It can be a proton, a metal cation, or an onium cation, where m represents the valence of the corresponding cation. In general formula (2-C), X 22 ~X 25 Each of the following groups independently represents an organic group or fluorine atom selected from the group consisting of alkyl (1-10 carbon atoms), alkenyl (2-10 carbon atoms), alkynyl (2-10 carbon atoms), cycloalkyl (3-10 carbon atoms), cycloalkenyl (3-10 carbon atoms), aryl (6-10 carbon atoms), alkoxy (1-10 carbon atoms), alkenyloxy (2-10 carbon atoms), alkynyloxy (2-10 carbon atoms), cycloalkoxy (3-10 carbon atoms), cycloalkenyloxy (3-10 carbon atoms), and aryloxy (6-10 carbon atoms), wherein any hydrogen atom in the organic group is optionally replaced by a fluorine atom, and an oxygen atom is optionally present between the carbon-carbon bonds in the organic group, wherein the organic group contains at least one fluorine atom, M1 m＋ The cation can be a proton, a metal cation, or an onium cation, where m represents the valence of the corresponding cation. Compounds represented by the general formula (2-C) contain at least one BF bond. Compound (3): The compound represented by the following general formula (3), [Chemical Formula 3] In general formula (3), R 31 This indicates a group with carbon-carbon unsaturated bonds, multiple R 31 Whether they are the same or different, R 32 This refers to an alkyl group having 1 to 10 fluorine atoms or carbon atoms, wherein the alkyl group optionally has at least one of fluorine atoms and oxygen atoms, and in the presence of multiple R... 32 In the case of multiple R 32 They are the same or different, where v represents an integer from 2 to 4. Compound (4): The compound represented by the following general formula (4), [Chemical Formula 4] In general formula (4), R 41 and R 42 Each of the following groups independently represents a hydrogen atom, an alkyl group with 1 to 2 carbon atoms, an alkenyl group with 2 to 5 carbon atoms, or an aryl group with 6 to 10 carbon atoms, wherein any hydrogen atom in the alkenyl group or the aryl group may be optionally substituted with a halogen atom, and n4 is 0 or 1. Compound (5): The compound represented by the following general formula (5).

[0014] [Chemical Formula 5] In general formula (5), R 50 ~R 53 Each of the following can be independently represented as a hydrogen atom, a fluorine atom, an alkyl group with 1 to 5 carbon atoms, or a fluoroalkyl group with 1 to 4 carbon atoms, and n51 represents an integer from 1 to 3.

[0015] [2] According to the non-aqueous electrolyte of [1], wherein the content of (I) is 0.01% by mass or more and 10% by mass or less relative to the total amount of the non-aqueous electrolyte.

[0016] [3] According to the non-aqueous electrolyte of [1] or [2], wherein the content of (II) is 0.01% by mass or more and 10% by mass or less relative to the total amount of the non-aqueous electrolyte.

[0017] [4] The non-aqueous electrolyte according to any one of [1] to [3], wherein the compound represented by the general formula (1) is at least one compound selected from the group consisting of 1,2-ethanedisulfonic anhydride and 1,3-propanedisulfonic anhydride.

[0018] [5] The non-aqueous electrolyte according to any one of [1] to [4], wherein the compound (2) is at least one compound selected from the group consisting of lithium difluorophosphate, lithium fluorosulfonate, lithium trifluoromethanesulfonate and lithium tetrafluoroborate.

[0019] [6] The non-aqueous electrolyte according to any one of [1] to [5], wherein the compound (3) is at least one compound selected from the group consisting of trivinylmethylsilane, trivinylfluorosilane and tetravinylsilane.

[0020] [7] The non-aqueous electrolyte according to any one of [1] to [6], wherein the compound (4) is at least one compound selected from the group consisting of 1,3,2-dioxothiacyclopentane-2,2-dioxide and 1,3,2-dioxothiacyclohexane-2,2-dioxide.

[0021] [8] The non-aqueous electrolyte according to any one of [1] to [7], wherein (III) is at least one selected from the group consisting of LiPF6, LiSbF6, LiAsF6, LiClO4, LiN(CF3SO2)2, LiN(FSO2)2, LiN(POF2)2, LiCF3SO3, LiC4F9SO3, LiAlO2, LiAlCl4, LiCl and LiI, or at least one selected from the group consisting of NaPF6, NaSbF6, NaAsF6, NaClO4, NaN(CF3SO2)2, NaN(FSO2)2, NaN(POF2)2, NaCF3SO3, NaC4F9SO3, NaAlO2, NaAlCl4, NaCl and NaI.

[0022] [9] The non-aqueous electrolyte according to any one of [1] to [8], wherein the (IV) comprises at least one selected from the group consisting of cyclic esters, chain esters, cyclic ethers, chain ethers, sulfone compounds, sulfoxide compounds and ionic liquids.

[0023]

[10] According to the non-aqueous electrolyte of [9], wherein the cyclic ester is a cyclic carbonate.

[0024]

[11] According to the non-aqueous electrolyte of

[10] , wherein the cyclic carbonate is at least one selected from the group consisting of ethylene carbonate, propylene carbonate and fluoroethylene carbonate.

[0025]

[12] According to the non-aqueous electrolyte of [9], wherein the chain ester is a chain carbonate.

[0026]

[13] According to the non-aqueous electrolyte of

[12] , wherein the chain carbonate is at least one selected from the group consisting of ethyl methyl carbonate, dimethyl carbonate, diethyl carbonate and methyl propyl carbonate.

[0027]

[14] A non-aqueous electrolyte battery, comprising at least a positive electrode, a negative electrode, a separator and any one of [1] to

[13] a non-aqueous electrolyte.

[0028] (III) Beneficial Effects This application provides a non-aqueous electrolyte that can reduce the initial resistance of a non-aqueous electrolyte battery, and a non-aqueous electrolyte battery with low initial resistance. Detailed Implementation

[0029] In this manual, "~" is used to indicate the lower and upper limits, including the values ​​listed before and after it.

[0030] The present application will now be described in detail. The description of the constituent elements described below is an example of the implementation of the present application and is not limited to these specific contents.

[0031] 1. Regarding non-aqueous electrolytes The non-aqueous electrolyte of this application contains: (I) The compounds represented by the following general formula (1), (II) Select at least one compound from the group consisting of compounds (2) to (5) below. (III) Solute, and (IV) Non-aqueous organic solvents.

[0032] [Chemical Formula 6] In general formula (1), R 1 This refers to an alkylene group having 1 to 6 carbon atoms. The carbon-carbon bonds in the alkylene group may optionally contain oxygen atoms. Furthermore, any hydrogen atom in the alkylene group may optionally be substituted with a halogen atom.

[0033] Compound (2): at least one compound selected from the group consisting of the compound represented by the following general formula (2-A), the compound represented by the following general formula (2-B) and the compound represented by the following general formula (2-C).

[0034] [Chemical Formula 7] In general formula (2-A), R 21 and R 22Each of these groups independently represents an organic group or fluorine atom selected from the group consisting of alkoxy groups with 1 to 10 carbon atoms, alkenoxy groups with 2 to 10 carbon atoms, alkynoxy groups with 2 to 10 carbon atoms, cycloalkoxy groups with 3 to 10 carbon atoms, cycloalkenoxy groups with 3 to 10 carbon atoms, and aryloxy groups with 6 to 10 carbon atoms, wherein any hydrogen atom in the organic group is optionally replaced by a fluorine atom, and an oxygen atom is optionally present between the carbon-carbon bonds in the organic group. M1 m＋ The cation is a proton, a metal cation, or an onium cation, where m represents the valence of the corresponding cation, and the compound represented by the general formula (2-A) contains at least one PF bond.

[0035] In general formula (2-B), X 21 The term "organic group" or "fluorine atom" is selected from the group consisting of alkyl (1-10 carbon atoms), alkenyl (2-10 carbon atoms), alkynyl (2-10 carbon atoms), cycloalkyl (3-10 carbon atoms), cycloalkenyl (3-10 carbon atoms), aryl (6-10 carbon atoms), alkoxy (1-10 carbon atoms), alkenyloxy (2-10 carbon atoms), alkynyloxy (2-10 carbon atoms), cycloalkoxy (3-10 carbon atoms), cycloalkenyloxy (3-10 carbon atoms), and aryloxy (6-10 carbon atoms), wherein any hydrogen atom in the organic group is optionally replaced by a fluorine atom, and an oxygen atom is optionally present between the carbon-carbon bonds in the organic group, wherein the organic group contains at least one fluorine atom. M1 m＋ It can be a proton, a metal cation, or an onium cation, where m represents the valence of the corresponding cation.

[0036] In general formula (2-C), X 22 ~X 25 Each of the following groups independently represents an organic group or fluorine atom selected from the group consisting of alkyl (1-10 carbon atoms), alkenyl (2-10 carbon atoms), alkynyl (2-10 carbon atoms), cycloalkyl (3-10 carbon atoms), cycloalkenyl (3-10 carbon atoms), aryl (6-10 carbon atoms), alkoxy (1-10 carbon atoms), alkenyloxy (2-10 carbon atoms), alkynyloxy (2-10 carbon atoms), cycloalkoxy (3-10 carbon atoms), cycloalkenyloxy (3-10 carbon atoms), and aryloxy (6-10 carbon atoms), wherein any hydrogen atom in the organic group is optionally replaced by a fluorine atom, and an oxygen atom is optionally present between the carbon-carbon bonds in the organic group, wherein the organic group contains at least one fluorine atom, M1 m＋ The cation is a proton, a metal cation, or an onium cation, where m represents the valence of the corresponding cation, and the compound represented by the general formula (2-C) contains at least one BF bond.

[0037] Compound (3): The compound represented by the following general formula (3).

[0038] [Chemical Formula 8] In general formula (3), R 31 This indicates a group with carbon-carbon unsaturated bonds, multiple R 31 Whether they are the same or different, R 32 The alkyl group represents an alkyl group having 1 to 10 fluorine atoms or carbon atoms, wherein the alkyl group optionally has at least one of fluorine atoms and oxygen atoms, and a plurality of R groups are present. 32 In the case of multiple R 32 They can be the same or different, and v represents an integer from 2 to 4.

[0039] Compound (4): The compound represented by the following general formula (4).

[0040] [Chemical Formula 9] In general formula (4), R 41 and R 42 Each of the following can independently represent a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an aryl group having 6 to 10 carbon atoms, wherein any hydrogen atom of the alkenyl group or the aryl group may be optionally substituted with a halogen atom, and n4 is 0 or 1.

[0041] Compound (5): The compound represented by the following general formula (5).

[0042] [Chemical Formula 10] In general formula (5), R 50 ~R 53 Each of the following can be independently represented as a hydrogen atom, a fluorine atom, an alkyl group with 1 to 5 carbon atoms, or a fluoroalkyl group with 1 to 4 carbon atoms, and n51 represents an integer from 1 to 3.

[0043] Regarding the compounds represented by general formula (1) (I) The compounds represented by general formula (1) (also referred to as "(I)") contained in the non-aqueous electrolyte of this application are described.

[0044] In general formula (1), R 1 The alkylene groups representing 1 to 6 carbon atoms can be either straight-chain or branched. As R 1 Examples include methylene, ethylene, n-propylene, isopropylene, n-butylene, and n-hexylene.

[0045] R 1In alkylene groups representing 1 to 6 carbon atoms, the carbon-carbon bonds may optionally include oxygen atoms. Furthermore, R 1 The hydrogen atoms of the alkylene group having 1 to 6 carbon atoms may be optionally replaced by halogen atoms (e.g., fluorine, chlorine, bromine, iodine, etc.).

[0046] R 1 Preferably, it refers to an alkylene group having 2 to 3 carbon atoms.

[0047] (I) Preferably, it is at least one compound selected from the group consisting of 1,2-ethanedisulfonic anhydride and 1,3-propanedisulfonic anhydride.

[0048] The non-aqueous electrolyte of this application can use a single compound as (I), or two or more compounds can be mixed in any combination or ratio as (I) depending on the application.

[0049] The compounds represented by general formula (1) can be prepared by various methods.

[0050] In the non-aqueous electrolyte of this application, the content of (I) (also referred to as "concentration of (I)") relative to the total amount of the non-aqueous electrolyte can be 0.01% by mass or more and 10% by mass or less. The lower limit of the concentration of (I) can be 0.08% by mass or more, 0.3% by mass or more, or 0.8% by mass or more. The upper limit of the concentration of (I) can be 8% by mass or less, 5% by mass or less, 4% by mass or less, 3% by mass or less, or 1.5% by mass or less.

[0051] Regarding (II), at least one compound selected from the group consisting of compounds (2) to (5) The non-aqueous electrolyte of this application contains (II) at least one compound selected from the group consisting of compounds (2) to (5) (also referred to as "(II)").

[0052] Compound (2) is at least one compound selected from the group consisting of the compound represented by the following general formula (2-A), the compound represented by the following general formula (2-B) and the compound represented by the following general formula (2-C).

[0053] [Chemical Formula 11] In general formula (2-A), R 21 and R 22Each of these groups independently represents an organic group or fluorine atom selected from the group consisting of alkoxy groups with 1 to 10 carbon atoms, alkenoxy groups with 2 to 10 carbon atoms, alkynoxy groups with 2 to 10 carbon atoms, cycloalkoxy groups with 3 to 10 carbon atoms, cycloalkenoxy groups with 3 to 10 carbon atoms, and aryloxy groups with 6 to 10 carbon atoms, wherein any hydrogen atom in the organic group is optionally replaced by a fluorine atom, and an oxygen atom is optionally present between the carbon-carbon bonds in the organic group. M1 m＋ The cation is a proton, a metal cation, or an onium cation, where m represents the valence of the corresponding cation, and the compound represented by the general formula (2-A) contains at least one PF bond.

[0054] In general formula (2-B), X 21 The term "organic group" or "fluorine atom" is selected from the group consisting of alkyl (1-10 carbon atoms), alkenyl (2-10 carbon atoms), alkynyl (2-10 carbon atoms), cycloalkyl (3-10 carbon atoms), cycloalkenyl (3-10 carbon atoms), aryl (6-10 carbon atoms), alkoxy (1-10 carbon atoms), alkenyloxy (2-10 carbon atoms), alkynyloxy (2-10 carbon atoms), cycloalkoxy (3-10 carbon atoms), cycloalkenyloxy (3-10 carbon atoms), and aryloxy (6-10 carbon atoms), wherein any hydrogen atom in the organic group is optionally replaced by a fluorine atom, and an oxygen atom is optionally present between the carbon-carbon bonds in the organic group, wherein the organic group contains at least one fluorine atom. M1 m＋ It can be a proton, a metal cation, or an onium cation, where m represents the valence of the corresponding cation.

[0055] In general formula (2-C), X 22 ~X 25 Each of the following groups independently represents an organic group or fluorine atom selected from the group consisting of alkyl (1-10 carbon atoms), alkenyl (2-10 carbon atoms), alkynyl (2-10 carbon atoms), cycloalkyl (3-10 carbon atoms), cycloalkenyl (3-10 carbon atoms), aryl (6-10 carbon atoms), alkoxy (1-10 carbon atoms), alkenyloxy (2-10 carbon atoms), alkynyloxy (2-10 carbon atoms), cycloalkoxy (3-10 carbon atoms), cycloalkenyloxy (3-10 carbon atoms), and aryloxy (6-10 carbon atoms), wherein any hydrogen atom in the organic group is optionally replaced by a fluorine atom, and an oxygen atom is optionally present between the carbon-carbon bonds in the organic group, wherein the organic group contains at least one fluorine atom, M1 m＋ The cation is a proton, a metal cation, or an onium cation, where m represents the valence of the corresponding cation, and the compound represented by the general formula (2-C) contains at least one BF bond.

[0056] In general formula (2-A), R21 and R 22 Each of these groups independently represents an organic group or fluorine atom selected from the group consisting of alkoxy groups with 1 to 10 carbon atoms, alkenoxy groups with 2 to 10 carbon atoms, alkynoxy groups with 2 to 10 carbon atoms, cycloalkoxy groups with 3 to 10 carbon atoms, cycloalkenoxy groups with 3 to 10 carbon atoms, and aryloxy groups with 6 to 10 carbon atoms. Any hydrogen atom in the organic group may optionally be replaced by a fluorine atom. M1 m＋ It can be a proton, a metal cation, or an onium cation. m represents the valence of the corresponding cation. Among them, the compound represented by general formula (2-A) contains at least one PF bond.

[0057] In general formula (2-B), X 21 This refers to an organic group or fluorine atom selected from the group consisting of alkyl (1-10 carbon atoms), alkenyl (2-10 carbon atoms), alkynyl (2-10 carbon atoms), cycloalkyl (3-10 carbon atoms), cycloalkenyl (3-10 carbon atoms), aryl (6-10 carbon atoms), alkoxy (1-10 carbon atoms), alkenyloxy (2-10 carbon atoms), alkynyloxy (2-10 carbon atoms), cycloalkoxy (3-10 carbon atoms), cycloalkenyloxy (3-10 carbon atoms), and aryloxy (6-10 carbon atoms). The organic group contains at least one fluorine atom. M1 m＋ It can be a proton, a metal cation, or an onium cation. m represents the valence of the corresponding cation.

[0058] In general formula (2-C), X 22 ~X 25 Each of these groups independently represents an organic group or fluorine atom selected from the group consisting of alkyl (1-10 carbon atoms), alkenyl (2-10 carbon atoms), alkynyl (2-10 carbon atoms), cycloalkyl (3-10 carbon atoms), cycloalkenyl (3-10 carbon atoms), aryl (6-10 carbon atoms), alkoxy (1-10 carbon atoms), alkenyloxy (2-10 carbon atoms), alkynyloxy (2-10 carbon atoms), cycloalkoxy (3-10 carbon atoms), cycloalkenyloxy (3-10 carbon atoms), and aryloxy (6-10 carbon atoms). The organic group contains at least one fluorine atom. M1 m＋ For protons, metal cations, or onium cations, m represents the valence of the corresponding cation. Compounds represented by the general formula (2-C) contain at least one BF bond.

[0059] In general formula (2-A), R 21 and R 22The alkoxy group can be linear or branched. Any hydrogen atom in the alkoxy group may be optionally replaced by a fluorine atom, and the carbon-carbon bonds in the alkoxy group may optionally contain oxygen atoms. Examples of alkoxy groups include methoxy, ethoxy, propoxy, isopropoxy, butoxy, sec-butoxy, tert-butoxy, pentoxy, trifluoromethoxy, 2,2-difluoroethoxy, 2,2,2-trifluoroethoxy, 2,2,3,3-tetrafluoropropoxy, 1,1,1-trifluoroisopropoxy, and 1,1,1,3,3,3-hexafluoroisopropoxy, which are alkoxy groups or fluorinated alkoxy groups with 1 to 10 carbon atoms.

[0060] R 21 and R 22 The olefin group represented can be linear or branched. Any hydrogen atom in the olefin group may be optionally replaced by a fluorine atom. An oxygen atom may be optionally present between the carbon-carbon bonds in the olefin group. In addition to carbon-carbon double bonds, unsaturated bonds other than carbon-carbon double bonds may also exist in the olefin group. Examples of olefin groups include ethyleneoxy, 1-propenoxy, 2-propenoxy, isopropenoxy, 2-butenoxy, 3-butenoxy, and 1,3-butadieneoxy, which are olefin groups with 2 to 10 carbon atoms or contain fluorinated olefin groups.

[0061] R 21 and R 22 The alkynyloxy group can be straight-chain or branched. Any hydrogen atom in the alkynyloxy group may optionally be replaced by a fluorine atom. An oxygen atom may optionally be present between the carbon-carbon bonds in the alkynyloxy group. In addition to the carbon-carbon triple bond, unsaturated bonds other than the carbon-carbon triple bond may also exist in the alkynyloxy group. Examples of alkynyloxy groups include acetylynoxy, 2-propynoxy, and 1,1-dimethyl-2-propynoxy, which are alkynoxy groups with 2 to 10 carbon atoms or contain fluorine.

[0062] R 21 and R 22 Any hydrogen atom in the cycloalkoxy group may be optionally substituted with at least one of an alkyl group and a fluorine atom. An oxygen atom may optionally be present between the carbon-carbon bonds in the cycloalkoxy group. Examples of cycloalkoxy groups include cyclopentoxy, cyclohexyloxy, and other cycloalkoxy groups with 3 to 10 carbon atoms, or fluorinated cycloalkoxy groups.

[0063] R 21 and R 22 Any hydrogen atom in the cycloalkenyloxy group may be optionally substituted with at least one of an alkyl group and a fluorine atom. An oxygen atom may optionally be present between the carbon-carbon bonds in the cycloalkenyloxy group. Examples of cycloalkenyloxy groups include cyclopentenyloxy, cyclohexenyloxy, and other cycloalkenyloxy groups with 3 to 10 carbon atoms, or fluorinated cycloalkenyloxy groups.

[0064] R21 and R 22 Any hydrogen atom of the aryloxy group may be optionally replaced by at least one of an alkyl group and a fluorine atom. Examples of aryloxy groups include phenoxy, tolyloxy, xyleneoxy, and other aryloxy groups with 6 to 10 carbon atoms or fluorinated aryloxy groups.

[0065] The compound represented by general formula (2-A) contains at least one PF bond. Preferably, it has m R bonds. 21 and m R 22 At least one of them represents a fluorine atom.

[0066] If R 21 and R 22 Each alkoxy group, being independently a fluorine atom or having a fluorine atom, is preferred because its strong electron-withdrawing properties increase the degree of ionic dissociation, thereby increasing the ionic conductivity in the solution or composition.

[0067] If R 21 and R 22 If the anion is fluorine, the increased mobility due to the smaller anion size results in a very high ionic conductivity in the solution or composition, which is therefore more preferable.

[0068] In addition, R 21 and R 22 The number of carbon atoms is preferably 6 or less. If the number of carbon atoms is 6 or less, there is a tendency for the aforementioned ionic conductivity to be relatively high, which is therefore preferred.

[0069] In general formula (2-A), M1 m＋ This refers to protons, metal cations, or onium cations. There are no particular limitations on the type of substance, provided it does not impair the performance of the non-aqueous electrolyte and the non-aqueous electrolyte battery of this application; a wide variety of substances can be selected from the above.

[0070] As M1 m＋ Metal cations that can be used to represent metal cations include: alkali metal cations such as lithium ion, sodium ion, potassium ion, rubidium ion, and cesium ion; alkaline earth metal cations such as magnesium ion, calcium ion, and barium ion; and silver ion, copper ion, and iron ion.

[0071] As M1 m＋ Examples of onion cations that can be used to represent onion cations include tetraalkylammonium, tetraalkylphosphonium, and imidazolium derivatives.

[0072] m represents the valence of the corresponding cation, which can be 1 to 3, or 1 or 2.

[0073] In particular, from the perspective of playing a role in promoting ion conduction in non-aqueous electrolyte batteries, M1 m＋Preferably, lithium ions, sodium ions, potassium ions, tetramethylammonium ions, tetraethylammonium ions, tetrabutylphosphonium ions, etc.

[0074] Furthermore, when M1 m＋ When used in lithium-ion batteries, lithium-ion batteries are preferred, and when used in sodium-ion batteries, sodium-ion batteries are preferred.

[0075] The following are specific examples of anionic structures of compounds represented by general formula (2-A), but are not limited to them.

[0076] [Chemical Formula 12] In general formula (2-B), X 21 The alkyl group represented can be straight-chain or branched. Any hydrogen atom in the alkyl group may optionally be replaced by a fluorine atom. An oxygen atom may optionally be present between the carbon-carbon bonds in the alkyl group. The alkyl group contains at least one fluorine atom. Examples of alkyl groups with 1 to 10 carbon atoms include trifluoromethyl, 2,2-difluoroethyl, 2,2,2-trifluoroethyl, 2,2,3,3-tetrafluoropropyl, and 1,1,1,3,3,3-hexafluoroisopropyl.

[0077] X 21 The alkenyl group can be linear or branched. Any hydrogen atom in the alkenyl group may be optionally replaced by a fluorine atom. An oxygen atom may be optionally present between the carbon-carbon bonds in the alkenyl group. In addition to carbon-carbon double bonds, other unsaturated bonds may also exist in the alkenyl group. The alkenyl group contains at least one fluorine atom.

[0078] X 21 The alkynyl group can be linear or branched. Any hydrogen atom in the alkynyl group may be optionally replaced by a fluorine atom. An oxygen atom may be optionally present between the carbon-carbon bonds in the alkynyl group. In addition to the carbon-carbon triple bond, unsaturated bonds other than the carbon-carbon triple bond may also exist in the alkynyl group. The alkynyl group contains at least one fluorine atom.

[0079] X 21 Any hydrogen atom in the cycloalkyl group may be optionally substituted with at least one of an alkyl group and a fluorine atom. An oxygen atom may optionally be present between the carbon-carbon bonds in the cycloalkyl group. The cycloalkyl group contains at least one fluorine atom.

[0080] X 21 Any hydrogen atom in the cycloalkenyl group may be optionally substituted with at least one of an alkyl group and a fluorine atom. An oxygen atom may optionally be present between the carbon-carbon bonds in the cycloalkenyl group. The cycloalkenyl group contains at least one fluorine atom.

[0081] X 21Any hydrogen atom of the aryl group may be optionally substituted with at least one of an alkyl group and a fluorine atom. The aryl group contains at least one fluorine atom.

[0082] X 21 The alkoxy group can be linear or branched. Any hydrogen atom in the alkoxy group may optionally be replaced by a fluorine atom. An oxygen atom may optionally be present between the carbon-carbon bonds in the alkoxy group. The alkoxy group contains at least one fluorine atom. Examples of fluoroalkoxy groups with 1 to 10 carbon atoms include, for example, trifluoromethoxy, 2,2-difluoroethoxy, 2,2,2-trifluoroethoxy, 2,2,3,3-tetrafluoropropoxy, 1,1,1-trifluoroisopropoxy, and 1,1,1,3,3,3-hexafluoroisopropoxy.

[0083] X 21 The olefin group represented can be linear or branched. Any hydrogen atom in the olefin group may optionally be replaced by a fluorine atom. An oxygen atom may optionally be present between the carbon-carbon bonds in the olefin group. In addition to carbon-carbon double bonds, unsaturated bonds other than carbon-carbon double bonds may also exist in the olefin group. The olefin group contains at least one fluorine atom.

[0084] X 21 The alkynyloxy group can be straight-chain or branched. Any hydrogen atom in the alkynyloxy group may optionally be replaced by a fluorine atom. An oxygen atom may optionally be present between the carbon-carbon bonds in the alkynyloxy group. In addition to the carbon-carbon triple bond, unsaturated bonds other than the carbon-carbon triple bond may also exist in the alkynyloxy group. The alkynyloxy group contains at least one fluorine atom.

[0085] X 21 Any hydrogen atom in the represented cycloalkoxy group may optionally be substituted with at least one of an alkyl group and a fluorine atom. An oxygen atom may optionally be present between the carbon-carbon bonds in the cycloalkoxy group. The cycloalkoxy group contains at least one fluorine atom.

[0086] X 21 Any hydrogen atom in the cycloalkenyloxy group may optionally be substituted with at least one of an alkyl group and a fluorine atom. An oxygen atom may optionally be present between the carbon-carbon bonds in the cycloalkenyloxy group. The cycloalkenyloxy group contains at least one fluorine atom.

[0087] X 21 Any hydrogen atom of the aryloxy group may be optionally substituted with at least one of an alkyl group and a fluorine atom. The aryloxy group contains at least one fluorine atom.

[0088] In the general formula (2-B), if X 21 If the material is an alkyl group or an alkoxy group, it tends to have a lower internal resistance when a coating is formed on the electrode, and is therefore preferred.

[0089] In the general formula (2-B), if X 21 If the atom is fluorine, its strong electron-withdrawing property leads to increased ionic dissociation, resulting in higher ionic conductivity in the solution or composition, thus making it preferred. Furthermore, if X... 21 If the anion is fluorine, the increased mobility due to the smaller anion size results in very high ionic conductivity in the solution or composition, which is therefore preferred.

[0090] Furthermore, if X 21 When the number of carbon atoms is 6 or less, there is a tendency for the aforementioned ionic conductivity to be relatively high, which is therefore preferred. More preferably, the number of carbon atoms is 1 to 4, and even more preferably, the number of carbon atoms is 1 to 3. Specifically, trifluoromethyl, trifluoromethoxy, trifluoroethoxy, etc. can be listed, and trifluoromethyl with a small anion size is particularly preferred.

[0091] For M1 in general formula (2-B) m＋ The explanation, specific examples, and preferred range of m are respectively related to M1 in the aforementioned general formula (2-A). m＋ The descriptions, specific examples, and preferred ranges for m are the same.

[0092] The following are specific examples of anionic structures of compounds represented by general formula (2-B), but are not limited thereto.

[0093] [Chemical Formula 13] For X in general formula (2-C) 22 ~X 25 The description, specific examples, and preferred range are respectively related to X in the aforementioned general formula (2-B). 21 The description, specific examples, and preferred scope are the same. Additionally, the X... 22 ~X 25 More preferably, it is an alkyl group or a fluorine atom having a fluorine atom, and particularly preferably a fluorine atom.

[0094] For M1 in general formula (2-C) m＋ The explanation, specific examples, and preferred range of m are respectively related to M1 in the aforementioned general formula (2-A). m＋ The descriptions, specific examples, and preferred ranges for m are the same.

[0095] The following are specific examples of anionic structures of compounds represented by general formula (2-C), but are not limited to them.

[0096] [Chemical Formula 14] Compound (2) is preferably at least one compound selected from the group consisting of difluorophosphate, fluorosulfonate, trifluoromethanesulfonate and tetrafluoroborate, and more preferably at least one compound selected from the group consisting of lithium difluorophosphate, lithium fluorosulfonate, lithium trifluoromethanesulfonate and lithium tetrafluoroborate.

[0097] Compound (3) is the compound represented by the following general formula (3).

[0098] [Chemical Formula 15] In general formula (3), R 31 This indicates a group containing carbon-carbon unsaturated bonds. Multiple R groups... 31 They are the same or different from each other. 32 This refers to an alkyl group having 1 to 10 fluorine atoms or carbon atoms, wherein the alkyl group may have at least one of fluorine atoms and oxygen atoms. Multiple R groups are present. 32 In the case of multiple R 32 They can be the same or different. v represents an integer from 2 to 4.

[0099] As R 31 The groups containing carbon-carbon unsaturated bonds mentioned include alkenyl groups with 2 to 8 carbon atoms, such as vinyl, allyl, 1-propenyl, isopropenyl, 2-butenyl, and 1,3-butadienyl; or alkynyl groups with 2 to 8 carbon atoms, such as alkynyloxy, acetylene, 2-propynyl, and 1,1-dimethyl-2-propynyl; or aryl groups with 6 to 12 carbon atoms, such as alkynyloxy, phenyl, tolyl, and xylene; or aryloxy groups derived from these groups. Furthermore, the above-mentioned groups may contain fluorine and oxygen atoms. Preferably, groups containing carbon-carbon unsaturated bonds with 6 or fewer carbon atoms are used. If the number of carbon atoms is 6 or fewer, there is a tendency for a decrease in resistance when a coating is formed on the electrode. 31 The group represented by the carbon-carbon unsaturated bond is preferably selected from the group consisting of vinyl, allyl, 1-propenyl, ethynyl and 2-propynyl.

[0100] R 32 The alkyl group can be straight-chain or branched. Any hydrogen atom in the alkyl group can be replaced by a fluorine atom. An oxygen atom may optionally be present between the carbon-carbon bonds in the alkyl group. Examples of alkyl groups include methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, pentyl, etc. Furthermore, the above groups may have at least one of a fluorine atom and an oxygen atom.

[0101] If R 32If the group selected is from the group consisting of fluorine atom, methyl, ethyl, propyl, 2,2,2-trifluoroethyl, 2,2,3,3-tetrafluoropropyl, 1,1,1-trifluoroisopropyl and 1,1,1,3,3,3-hexafluoroisopropyl, then there is a tendency for the initial resistance to be lower when a coating is formed on the electrode, which is preferred from the perspective of output characteristics.

[0102] In general formula (3), v represents an integer from 2 to 4, preferably 3 or 4, and particularly preferably 4.

[0103] The following are specific examples of compounds represented by general formula (3), but are not limited thereto.

[0104] [Chemical Formula 16] Compound (3) is preferably at least one compound selected from the group consisting of trivinylmethylsilane, trivinylfluorosilane and tetravinylsilane.

[0105] Compound (4) is the compound represented by the following general formula (4).

[0106] [Chemical Formula 17] In general formula (4), R 41 and R 42 Each of the following can independently represent a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an aryl group having 6 to 10 carbon atoms. Any hydrogen atom in the alkenyl or aryl group may optionally be substituted with a halogen atom. n4 is 0 or 1.

[0107] As R 41 and R 42 The alkyl group can be represented by, for example, methyl and ethyl.

[0108] R 41 and R 42 The alkenyl group can be linear or branched. Examples of alkenyl groups include vinyl, allyl, 1-propenyl, isopropenyl, 2-butenyl, and 1,3-butadienyl.

[0109] R 41 and R 42 The hydrogen atom of the aryl group may be optionally replaced by an alkyl group. Examples of aryl groups include phenyl, tolyl, and xylyl.

[0110] At least one hydrogen atom of any of the alkenyl and aryl groups may optionally be substituted with a halogen atom. Examples of halogen atoms include fluorine, bromine, and iodine, but fluorine is preferred.

[0111] R41 and R 42 The preferred representation is a hydrogen atom.

[0112] When n4 is 0, R 41 The bonded carbon atom and R 42 The carbon atoms are bonded by single bonds.

[0113] Compound (4) is preferably at least one compound selected from the group consisting of 1,3,2-dioxothiacyclopentane-2,2-dioxide and 1,3,2-dioxothiacyclohexane-2,2-dioxide.

[0114] The following are specific examples of compounds represented by general formula (4), but are not limited thereto.

[0115] [Chemical Formula 18] Compound (5) is the compound represented by the following general formula (5).

[0116] [Chemical Formula 19] In general formula (5), R 50 ~R 53 Each can independently represent a hydrogen atom, a fluorine atom, an alkyl group with 1 to 5 carbon atoms, or a fluoroalkyl group with 1 to 4 carbon atoms. n51 represents an integer from 1 to 3.

[0117] In general formula (5), R 50 ~R 53 The alkyl group can be straight-chain or branched. Examples of alkyl groups include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, and pentyl.

[0118] R 50 ~R 53 The fluoroalkyl group represented can be either straight-chain or branched. Examples of fluoroalkyl groups include trifluoromethyl, 2,2-difluoroethyl, 2,2,2-trifluoroethyl, 2,2,3,3-tetrafluoropropyl, and 1,1,1,3,3,3-hexafluoroisopropyl.

[0119] R 50 ~R 53 Preferably, it is a hydrogen atom, a fluorine atom, or a trifluoromethyl group, and more preferably a hydrogen atom.

[0120] In general formula (5), n51 represents an integer from 1 to 3, which can be 1 or 2, preferably 1.

[0121] Examples of compounds (5) include 1,3-propenyl sulfonyl lactone (1-propenyl-1,3-sulfonic acid lactone), 1,4-butene sulfonyl lactone, 2,4-pentene sulfonyl lactone, 3,5-pentene sulfonyl lactone, 1-fluoro-1,3-propenyl sulfonyl lactone, 1-trifluoromethyl-1,3-propenyl sulfonyl lactone, 1,1,1-trifluoro-2,4-butene sulfonyl lactone, 1,4-butene sulfonyl lactone, 1,5-pentene sulfonyl lactone, etc.

[0122] Compound (5) is preferably 1-propenyl 1,3-sulfonyl lactone.

[0123] The non-aqueous electrolyte of this application can use a single compound as (II), or two or more compounds can be mixed in any combination or ratio as (II) depending on the application.

[0124] In the non-aqueous electrolyte of this application, the content of (II) relative to the total amount of the non-aqueous electrolyte (also referred to as "concentration of (II)") can be 0.01% by mass or more and 10% by mass or less. The lower limit of the concentration of (II) can be 0.08% by mass or more, 0.1% by mass or more, or 0.2% by mass or more. The upper limit of the concentration of (II) can be 8% by mass or less, 6% by mass or less, or 5% by mass or less.

[0125] Regarding (III) solute The (III) solute (also referred to as "(III)") contained in the non-aqueous electrolyte of this application will be described.

[0126] (III) The solute is not particularly limited, and may be at least one selected from the group consisting of LiPF6, LiSbF6, LiAsF6, LiClO4, LiN(CF3SO2)2, LiN(FSO2)2, LiN(POF2)2, LiCF3SO3, LiC4F9SO3, LiAlO2, LiAlCl4, LiCl and LiI, or at least one selected from the group consisting of NaPF6, NaSbF6, NaAsF6, NaClO4, NaN(CF3SO2)2, NaN(FSO2)2, NaN(POF2)2, NaCF3SO3, NaC4F9SO3, NaAlO2, NaAlCl4, NaCl and NaI.

[0127] The non-aqueous electrolyte of this application may use a single compound as (III), or may mix two or more compounds in any combination or ratio as (III) depending on the application.

[0128] The concentration of (III) is not particularly limited relative to the total amount of non-aqueous electrolyte. For example, the lower limit of the concentration of (III) can be set to 0.5 mol / L or more, 0.7 mol / L or more, or 0.9 mol / L or more. Furthermore, the upper limit of the concentration of (III) can be set to 2.5 mol / L or less, 2 mol / L or less, or 1.5 mol / L or less. In addition, when using two or more solutes as (III), it is preferable that the total concentration of these solutes is within the above-mentioned range.

[0129] There is no particular limitation on the liquid temperature when (III) is dissolved in (IV) non-aqueous organic solvent; it can be -20 to 80°C or 0 to 60°C.

[0130] Regarding (IV) non-aqueous organic solvents The (IV) non-aqueous organic solvent (also referred to as "(IV)") contained in the non-aqueous electrolyte of this application will be described. There is no particular limitation on the type of (IV) non-aqueous organic solvent, and any non-aqueous organic solvent may be used.

[0131] The following non-aqueous organic solvents can be listed as specific examples of (IV) non-aqueous organic solvents.

[0132] In addition to cyclic carbonates such as propylene carbonate (hereinafter sometimes referred to as "PC"), ethylene carbonate (hereinafter sometimes referred to as "EC"), fluoroethylene carbonate (hereinafter sometimes referred to as "FEC"), and butenyl carbonate, γ-butyrolactone and γ-valerolactone can also be listed as cyclic esters. Furthermore, for the aforementioned FEC, when its content is 10% by mass or less relative to the total amount of the non-aqueous electrolyte, it is defined as other additives as described later.

[0133] In addition to diethyl carbonate (hereinafter sometimes referred to as "DEC"), dimethyl carbonate (hereinafter sometimes referred to as "DMC"), methyl ethyl carbonate (hereinafter sometimes referred to as "EMC"), methyl propyl carbonate, methyl acetate, methyl propionate, ethyl propionate (hereinafter sometimes referred to as "EP"), etc., other chain esters include methyl acetate, methyl propionate, ethyl propionate, etc.

[0134] Examples of cyclic ethers include tetrahydrofuran, 2-methyltetrahydrofuran, and dioxane.

[0135] Examples of chain ethers include dimethoxyethane and diethyl ether.

[0136] In addition, examples include sulfone compounds such as dimethyl sulfoxide and sulfolane. Furthermore, ionic liquids can also be listed.

[0137] (IV) The non-aqueous organic solvent may contain at least one selected from the group consisting of cyclic esters, chain esters, cyclic ethers, chain ethers, sulfone compounds, sulfoxide compounds and ionic liquids.

[0138] Cyclic esters are cyclic carbonates, which can be at least one selected from the group consisting of ethylene carbonate, propylene carbonate, and fluoroethylene carbonate.

[0139] The chain ester is a chain carbonate, which can be at least one selected from the group consisting of methyl ethyl carbonate, dimethyl carbonate, diethyl carbonate and methyl propyl carbonate.

[0140] The non-aqueous electrolyte of this application can use a single compound as (IV), or two or more compounds can be mixed in any combination or ratio as (IV) depending on the application.

[0141] The content of cyclic carbonates is not particularly limited and can be arbitrary as long as it does not significantly impair the effectiveness of this application. When used alone, the content can be set to 3% by volume or more in 100% by volume of a non-aqueous organic solvent, or it can be set to 5% by volume or more. By setting it within this range, it is easy to avoid the decrease in conductivity caused by the decrease in the dielectric constant of the non-aqueous electrolyte, and it is easy to make the high-current discharge characteristics, stability relative to the negative electrode, and cycle characteristics of the non-aqueous electrolyte battery good. In addition, it can be set to 90% by volume or less, preferably 85% by volume or less, and more preferably 80% by volume or less. By setting it within this range, it is easy to make the viscosity of the non-aqueous electrolyte within a suitable range, easy to suppress the decrease in ionic conductivity, and thus easy to make the load characteristics of the non-aqueous electrolyte battery good.

[0142] Furthermore, cyclic carbonates can be used in any combination of two or more. One preferred combination is a combination of ethylene carbonate and propylene carbonate. In this case, the volume ratio of ethylene carbonate to propylene carbonate is preferably 99:1 to 40:60, particularly preferably 95:5 to 50:50. Further, the amount of propylene carbonate in the total non-aqueous organic solvent is not particularly limited, and can be arbitrary as long as it does not significantly impair the effect of this application. It can be 1% by volume or more, preferably 2% by volume or more, more preferably 3% by volume or more, and furthermore, it can be 30% by volume or less, preferably 25% by volume or less, more preferably 20% by volume or less. If propylene carbonate is included within this range, the low-temperature characteristics can be further improved while maintaining the characteristics of the combination of ethylene carbonate and dialkyl carbonate, which is therefore preferred.

[0143] Chain esters can be used alone, or two or more can be used simultaneously in any combination and ratio.

[0144] The content of the chain ester is not particularly limited, but in a 100% volume non-aqueous organic solvent, it can be 15% by volume or more, preferably 20% by volume or more, and more preferably 25% by volume or more. Furthermore, it can be 90% by volume or less, preferably 85% by volume or less, and more preferably 80% by volume or less. By keeping the content of the chain ester within the above range, it is easy to make the viscosity of the non-aqueous electrolyte within a suitable range, to easily suppress the decrease in ionic conductivity, and thus to easily make the input-output characteristics and charge-discharge rate characteristics of the non-aqueous electrolyte battery within a good range. Furthermore, it is easy to avoid the decrease in conductivity caused by the decrease in the dielectric constant of the non-aqueous electrolyte, and to easily make the input-output characteristics and charge-discharge rate characteristics of the non-aqueous electrolyte battery within a good range.

[0145] Furthermore, by combining ethylene carbonate in specific amounts relative to specific chain esters, battery performance can be significantly improved.

[0146] For example, when dimethyl carbonate and ethyl methyl carbonate are selected as specific chain esters, the content of ethylene carbonate is not particularly limited, and can be arbitrary as long as it does not significantly impair the effect of this application. It can be set to 5% by volume or more, preferably 10% by volume or more, and further, it can be set to 45% by volume or less, preferably 40% by volume or less. The content of dimethyl carbonate can be set to 20% by volume or more, preferably 30% by volume or more, and further, it can be set to 50% by volume or less, preferably 45% by volume or less. The content of ethyl methyl carbonate can be set to 20% by volume or more, preferably 30% by volume or more, and further, it can be set to 50% by volume or less, preferably 45% by volume or less. By keeping the content within the above range, it is possible to reduce the low-temperature precipitation temperature of the electrolyte, while also reducing the viscosity of the non-aqueous electrolyte and increasing the ionic conductivity, thus achieving high input and output even at low temperatures.

[0147] The content of the chain ether is not particularly limited, and can be arbitrary as long as it does not significantly impair the effect of this application. In 100% by volume of a non-aqueous organic solvent, it can be 1% by volume or more, preferably 2% by volume or more, more preferably 3% by volume or more. Furthermore, it can be 30% by volume or less, preferably 25% by volume or less, more preferably 20% by volume or less. If the content of the chain ether is within the above range, it is easy to ensure the improvement of lithium-ion dissociation degree of the chain ether and the improvement of ionic conductivity caused by viscosity reduction. In addition, when the negative electrode active material is a carbonaceous material, the phenomenon of co-intercalation of the chain ether and lithium ions can be suppressed, thus enabling the input / output characteristics and charge / discharge rate characteristics to be within a suitable range.

[0148] The content of sulfone compounds is not particularly limited, and can be arbitrary as long as it does not significantly impair the effects of this application. In 100% by volume of a non-aqueous organic solvent, it can be 0.3% by volume or more, preferably 0.5% by volume or more, more preferably 1% by volume or more. Furthermore, it can be 40% by volume or less, preferably 35% by volume or less, more preferably 30% by volume or less. If the content of sulfone compounds is within the above range, it is easy to obtain improved durability, such as improved cycle characteristics and storage characteristics. In addition, it allows the viscosity of the non-aqueous electrolyte to be within a suitable range, preventing a decrease in conductivity, and allowing the input / output characteristics and charge / discharge rate characteristics of the non-aqueous electrolyte battery to be within a suitable range.

[0149] Regarding other additives The above is a description of the basic composition of the non-aqueous electrolyte of this application. As long as it does not impair the purpose of this application, additives commonly used in the non-aqueous electrolyte of this application may be added in any ratio.

[0150] When the non-aqueous electrolyte of this application contains other additives, the content of the other additives may be more than 0.01% by mass and less than 10% by mass relative to the total amount of the non-aqueous electrolyte.

[0151] Specific examples of other additives include vinylene carbonate (hereinafter sometimes referred to as "VC"), oligomers of vinylene carbonate (with a number average molecular weight of 170-5000 when converted from polystyrene), fluoroethylene carbonate, trans-difluoroethylene carbonate, 1,6-hexamethylene diisocyanate, ethynyl ethylene carbonate, 1,3-propane sulpholactone (hereinafter sometimes referred to as "1,3-PS"), methane disulfonate, and methane sulfonyl... Fluorine, tris(trimethylsilyl)borate, (ethoxy)pentafluorocyclotriphosphazene, tetrafluoro(pyridinium carboxylate) phosphate, difluoro(pyridinium carboxylate) phosphate, 1,3-dimethyl-1,3-divinyl-1,3-bis(1,1,1,3,3,3-hexafluoroisopropyl)disiloxane, tert-butylbenzene, tert-amylbenzene, fluorobenzene, cyclohexylbenzene, biphenyl, difluoroanisole, 4,5-dimethyl-1,3-dioxacyclopenten-2-one, and nitrates, etc. By including the above-mentioned additives in the non-aqueous electrolyte of this application, at least one of the following effects can be improved: overcharge protection, negative electrode coating formation, and positive electrode effect.

[0152] The non-aqueous electrolyte of this application is suitable for use in non-aqueous electrolyte batteries (preferably non-aqueous electrolyte secondary batteries).

[0153] 2. Regarding non-aqueous electrolyte batteries The non-aqueous electrolyte battery of this application includes at least the non-aqueous electrolyte, negative electrode, and positive electrode described above. Additionally, it may include a separator or casing, etc.

[0154] The non-aqueous electrolyte battery of this application preferably includes at least a positive electrode, a negative electrode, a separator, and the non-aqueous electrolyte of this application.

[0155] The non-aqueous electrolyte battery of this application is preferably a non-aqueous electrolyte secondary battery.

[0156] As a negative electrode, there are no particular limitations; materials in which alkali metal ions, primarily lithium or sodium ions, or alkaline earth metal ions can be reversibly inserted and extracted can be used.

[0157] For example, in the case of a lithium-ion secondary battery with lithium as the primary cation, the negative electrode active material constituting the negative electrode is a material capable of lithium-ion doping / dedoping. Examples include: carbon materials with a d-value of less than 0.340 nm for the (002) crystal plane in X-ray diffraction; carbon materials with a d-value greater than 0.340 nm for the (002) crystal plane in X-ray diffraction; oxides of one or more metals selected from Si, Sn, and Al; metals selected from Si, Sn, and Al, or alloys containing these metals, or alloys of these metals or alloys with lithium; and materials containing at least one substance selected from lithium titanium oxides. These negative electrode active materials can be used individually or in combination of two or more. Furthermore, lithium metal, metal nitrides, tin compounds, conductive polymers, etc., can be used.

[0158] For example, in the case of a sodium-ion secondary battery where the cation is primarily sodium, the negative electrode active material can be sodium metal, alloys of sodium metal with other metals such as tin, intermetallic compounds of sodium metal with other metals, various carbon materials, primarily hard carbon, metal oxides such as titanium oxide, metal nitrides, elemental tin, tin compounds, activated carbon, conductive polymers, etc. In addition, phosphorus (elemental) materials such as red phosphorus and black phosphorus, phosphorus compounds such as Co-P, Cu-P, Sn-P, Ge-P, and Mo-P, antimony (elemental), and antimony compounds such as Sb / C and Bi-Sb can be used. These negative electrode active materials can be used individually or in combination.

[0159] As a positive electrode, there are no particular limitations; materials in which alkali metal ions, primarily lithium or sodium ions, or alkaline earth metal ions can be reversibly inserted and extracted can be used.

[0160] For example, when the cation is lithium, as a positive electrode material, lithium-containing transition metal composite oxides such as LiCoO2, LiNiO2, LiMnO2, and LiMn2O4 can be used; substances formed by mixing multiple transition metals such as Co, Mn, and Ni in these lithium-containing transition metal composite oxides; substances formed by replacing some of the transition metals in these lithium-containing transition metal composite oxides with other metals besides transition metals; phosphate compounds of transition metals such as LiFePO4, LiCoPO4, and LiMnPO4, which are called olivine; oxides such as TiO2, V2O5, and MoO3; sulfides such as TiS2 and FeS; or conductive polymers such as polyacetylene, poly(p-phenylene), polyaniline, and polypyrrole; activated carbon; free radical-generating polymers; and carbon materials.

[0161] For example, when the cation is sodium, NaCrO2 or NaFe can be used as the positive electrode material (positive electrode active material). 0.5 Co 0.5 O2, NaFe 0.4 Mn 0.3 Ni 0.3 O2, NaNi 0.5 Ti 0.3 Mn 0.2 O2, NaNi 1 / 3 Ti 1 / 3 Mn 1 / 3 O2, NaNi 0.33 Ti 0.33 Mn 0.16 Mg 0.17 O2, Na 2 / 3 Ni 1 / 3 Ti 1 / 6 Mn 1 / 2 O2, Na 2 / 3 Ni 1 / 3 Mn 2 / 3 Sodium-containing transition metal complex oxides such as O2; substances formed by mixing multiple transition metals such as Co, Mn, and Ni into these sodium-containing transition metal complex oxides; substances formed by replacing some of the transition metals in these sodium-containing transition metal complex oxides with other metals besides the transition metals; polyanionic compounds such as NaFePO4, NaVPO4F, Na3V2(PO4)3, and Na2Fe2(SO4)3; and compounds with the formula Na... a M b [Fe(CN)6] cThe terms refer to sodium salts of Prussian blue analogues (M = Cr, Mn, Fe, Co, Ni, Cu or Zn, 0≤a≤2, 0.5≤b≤1.5, 0.5≤c≤1.5), oxides such as TiO2, V2O5, and MoO3, sulfides such as TiS2 and FeS, or conductive polymers such as polyacetylene, poly(p-phenylene), polyaniline, and polypyrrole, activated carbon, free radical-generating polymers, and carbon materials.

[0162] Acetylene black, Ketjen black, carbon fiber, or graphite can be added to the positive or negative electrode material as conductive materials, and polytetrafluoroethylene, polyvinylidene fluoride, or SBR resin as binders, etc., and can be further used to form sheet-like electrode sheets.

[0163] As a diaphragm to prevent contact between the positive and negative electrodes, nonwoven fabrics or porous sheets made of polypropylene, polyethylene, paper, or glass fiber can be used.

[0164] Electrochemical devices in shapes such as coin-shaped, cylindrical, square, or aluminum laminate can be assembled from the above elements.

[0165] Example The present application will be specifically described below using examples, but the present application is not limited to these examples.

[0166] [Examples 1-1 to 1-67, Comparative Examples 1-1 to 1-37] <Preparation of Non-Aqueous Electrolytes> In a glove box with a dew point below -60°C, EC, EMC, and DMC (as part of (III)) were mixed in a volume ratio of EC:EMC:DMC = 25:50:25. Then, while maintaining the internal temperature below 40°C, LiPF6 (as part of (II)) was added and dissolved at a concentration of 1.0 mol / L relative to the total amount of the non-aqueous electrolyte, and compound (1-1) (as part of (I)) was added and dissolved at a concentration of 0.5% by mass relative to the total amount of the non-aqueous electrolyte. The mixture was stirred for 1 hour to prepare the non-aqueous electrolyte of Comparative Example 1-1.

[0167] In addition, except for changing the type or concentration of (I), the type or concentration of (II), and the type or concentration of other additives as shown in Tables 1-4, the non-aqueous electrolytes of each example and comparative example were prepared using the same steps as the non-aqueous electrolytes of Comparative Examples 1-1 above.

[0168] The following shows the compounds used in the examples and comparative examples. Only compound numbers are shown in the table.

[0169] (1-1): 1,2-Isodisulfonic anhydride (1-2): 1,3-Propanedisulfonic anhydride (2-1): Lithium difluorophosphate (2-2): Lithium fluorosulfonate (2-3): Lithium tetrafluoroborate (3-1): Trivinylmethylsilane (3-2): Trivinylfluorosilane (3-3): Tetravinylsilane (4-1): 1,3,2-Dioxothiacyclopentane-2,2-dioxide (5-1): 1-Propylene-1,3-Sulfolactone (1-R): 2,1,3-Benzodioxathiole-1,1,3,3-tetraoxide (3-R): Trimethylvinylsilane (Making of NCM811 positive electrode) To 92.0% by mass of LiNi 0.8 Mn 0.1 Co 0.1 O2 powder is mixed with 3.5% by mass of polyvinylidene fluoride (hereinafter also referred to as "PVDF") as a binder and 4.5% by mass of acetylene black as a conductive material, and further added relative to LiNi 0.8 Mn 0.1 Co 0.1 A positive electrode paste was prepared by combining O2 powder, binder, and conductive material in a total mass of 45% N-methyl-2-pyrrolidone (hereinafter also referred to as "NMP"). The paste was coated on both sides of aluminum foil (A1085), dried, and pressurized before being stamped into a 4cm × 5cm shape, thus obtaining the NCM811 positive electrode for testing.

[0170] (Production of natural graphite anode) A negative electrode paste was prepared by mixing 97.0% by weight of natural graphite powder, 2.0% by weight of styrene-butadiene rubber as a binder, 1.0% by weight of sodium carboxymethyl cellulose, and water. This paste was coated onto one side of a copper foil, dried, and then pressed into a 4.5cm × 5.5cm shape to obtain the experimental natural graphite negative electrode.

[0171] (Fabrication of silicon-containing graphite anodes) A negative electrode paste was prepared by mixing 7.0% by mass of nano-silicon, 3.0% by mass of conductive material (manufactured by Denka Company Limited, HS-100), 2.0% by mass of carbon nanofiber (manufactured by Showa Denko K.K., VGCF), 2.0% by mass of styrene-butadiene rubber (hereinafter also referred to as "SBR"), 1.0% by mass of sodium carboxymethyl cellulose (hereinafter also referred to as "CMC"), and water into 85.0% by mass of artificial graphite powder. This paste was coated onto one side of a copper foil, dried, pressurized, and then stamped into a 4.5cm × 5.5cm shape, thus obtaining the experimental silicon-containing graphite negative electrode.

[0172] (The fabrication of non-aqueous electrolyte batteries as described in Tables 1-4) In an argon atmosphere with a dew point below -50°C, the terminals were fused to the aforementioned NCM811 positive electrode, and then the two sides were clamped by two polyethylene separators (5cm × 6cm). Further, two natural graphite negative electrodes with pre-fused terminals were used to clamp the outer sides so that the active material surfaces of the negative and positive electrodes faced each other. These were then placed in an aluminum-laminated bag with an opening on one side, and the prepared non-aqueous electrolyte was vacuum-injected. The opening was then sealed by heat, thereby producing the aluminum-laminated non-aqueous electrolyte batteries of the examples and comparative examples described in Tables 1-4 below.

[0173] (Evaluation of non-aqueous electrolyte batteries) -Initial charge and discharge- The fabricated non-aqueous electrolyte battery was placed in a 25°C constant temperature bath and connected to a charge / discharge device under these conditions. The charge / discharge rate was 0.38 mA / cm². 2 Charge to 4.2V at a current density of 0.38mA / cm². Maintain 4.2V for 1 hour, then charge at 0.38mA / cm². 2 Discharge the battery to 2.5V using a current density. Perform three charge-discharge cycles to stabilize the battery. Use the discharge capacity of the third cycle as the initial charge-discharge capacity.

[0174] <Initial Resistance> After initial charge and discharge at 25℃ and 0.38 mA / cm 2 Charge to 4.2V and directly measure the resistance value (initial resistance) through impedance measurement.

[0175] <High-Temperature Storage Characteristics> With a charging upper limit voltage of 4.2V and a charging current of 0.38mA / cm 2 The non-aqueous electrolyte batteries, after the initial charge-discharge cycle, were charged and then removed from the charge-discharge device maintained at 25°C and stored in a 60°C constant temperature bath for 14 days. Then, they were placed back into the charge-discharge device maintained at 25°C at a rate of 0.38 mA / cm².2 The battery was discharged until the discharge cutoff voltage reached 2.5V, and the battery degradation was evaluated using the discharge capacity retention rate after storage. After discharge, the capacity was measured at 0.38 mA / cm². 2 Charge to 4.2V at a current density of 0.38mA / cm 2 The current density was used to discharge the battery to 2.5V, and the capacity obtained at this point was taken as the discharge capacity after storage at 60℃. The discharge capacity retention rate after storage at 60℃ was calculated using the following formula.

[0176] (Discharge capacity retention rate after storage at 60℃) Discharge capacity retention rate after storage at 60℃ (%) = (Discharge capacity after storage at 60℃ / Initial charge / discharge capacity) × 100 (Resistance value after storage at 60℃) Next, at 25℃ and 0.38mA / cm 2 Charge to 4.2V and directly measure the resistance value (resistance value after storage at 60℃) through impedance measurement.

[0177] In Tables 1-4 below, the initial resistance value represents the relative value when Comparative Example 1-1 is set to 100, "E1" represents the discharge capacity retention rate after storage at 60°C (relative value when Comparative Example 1-1 is set to 100), and "E2" represents the resistance value after storage at 60°C (relative value when Comparative Example 1-1 is set to 100).

[0178] [Table 1] [Table 2] [Table 3] [Table 4] As shown in Tables 1-4, when comparing the non-aqueous electrolyte batteries containing the non-aqueous electrolyte of the examples under the same conditions of type and concentration of (II) and type and concentration of other additives, the initial resistance of the non-aqueous electrolyte battery containing the non-aqueous electrolyte of the examples is lower than that of the non-aqueous electrolyte battery containing the corresponding comparative examples. Furthermore, it is known that the E1 of the non-aqueous electrolyte battery containing the non-aqueous electrolyte of the examples is larger than that of the non-aqueous electrolyte battery containing the comparative examples, and the E2 of the non-aqueous electrolyte battery containing the non-aqueous electrolyte of the examples is smaller than that of the non-aqueous electrolyte battery containing the comparative examples.

[0179] Furthermore, it is known that if the concentration of (I) is 0.01% by mass or more and 10% by mass or less, the initial resistance reduction effect is easily achieved; if it is 0.1% by mass or more and 1.5% by mass or less, the initial resistance is the lowest. Furthermore, it is known that the E1 of the non-aqueous electrolyte battery containing the non-aqueous electrolyte of the embodiment is larger than the E1 of the non-aqueous electrolyte battery containing the corresponding comparative example, and the E2 of the non-aqueous electrolyte battery containing the non-aqueous electrolyte of the embodiment is smaller than the E2 of the non-aqueous electrolyte battery containing the corresponding comparative example.

[0180] If we focus on type (I), then according to the comparison of Examples 1-4 and Examples 1-17 in Table 1, it can be seen that the initial resistance reduction effect of (1-1) is greater than that of (1-2).

[0181] If we focus on the type of compound (2), then according to the comparison of Examples 1-3 with Examples 1-13 with Examples 1-15, Examples 1-4 with Examples 1-14 with Examples 1-16, Examples 1-17 with Examples 1-18 with Examples 1-19, and Examples 1-20 with Examples 1-21 with Examples 1-22 in Table 1, it can be seen that the magnitude of the initial resistance reduction effect is (2-3) > (2-1) > (2-2).

[0182] If we focus on the type of compound (3), then according to the comparison of Examples 1-23 with Examples 1-25 with Examples 1-29, Examples 1-24 with Examples 1-26 with Examples 1-30, and Examples 1-39 with Examples 1-40 with Examples 1-41 in Table 2, it can be seen that the magnitude of the initial resistance reduction effect is (3-1)≈(3-3)>(3-2).

[0183] [Examples 2-1 to 2-59, Comparative Examples 2-1 to 2-28] In a glove box with a dew point below -60°C, EC, EMC, and DMC (as part of (III)) were mixed in a volume ratio of EC:EMC:DMC = 25:50:25. Then, while maintaining the internal temperature below 40°C, LiPF6 (as part of (III)) was added and dissolved under stirring to make its concentration 1.0 mol / L relative to the total amount of the non-aqueous electrolyte, compound (1-1) (as part of (I)) was added and dissolved to make its concentration 0.5% by mass relative to the total amount of the non-aqueous electrolyte, and FEC and VC (as other additives) were added and dissolved to make their concentrations 5.0% by mass and 2.0% by mass relative to the total amount of the non-aqueous electrolyte, respectively. The mixture was stirred for 1 hour to prepare the non-aqueous electrolyte of Comparative Example 2-1.

[0184] In addition, except for changing the type or concentration of (I), the type or concentration of (II), and the type or concentration of other additives as shown in Tables 5-10, the non-aqueous electrolytes of each example and comparative example were prepared using the same steps as the non-aqueous electrolyte of Comparative Example 2-1 above.

[0185] (The fabrication of non-aqueous electrolyte batteries is described in Tables 5-10) Under an argon atmosphere with a dew point below -50°C, the terminals were fused to the aforementioned NCM811 positive electrode, and then the two sides were clamped by two polyethylene separators (5cm × 6cm). Further, two silicon-containing graphite negative electrodes with pre-fused terminals were used to clamp the outer sides so that the active material surfaces of the negative and positive electrodes faced each other. Then, they were placed into an aluminum-laminated bag with an opening on one side, and the prepared non-aqueous electrolyte was vacuum-injected. The opening was then sealed by heat, thereby producing the aluminum-laminated non-aqueous electrolyte batteries of the examples and comparative examples described in Tables 5-10 below.

[0186] (Evaluation of non-aqueous electrolyte batteries) -Initial charge and discharge- The fabricated non-aqueous electrolyte battery was placed in a 25°C constant temperature bath and connected to a charge / discharge device under these conditions. The charge / discharge rate was 0.38 mA / cm². 2 Charge to 4.2V at a current density of 0.38mA / cm². Maintain 4.2V for 1 hour, then charge at 0.38mA / cm². 2 Discharge the battery to 2.5V using a current density. Set this as one charge-discharge cycle and perform a total of 3 charge-discharge cycles to stabilize the battery.

[0187] <Initial Resistance> After initial charge and discharge at 25℃ and 0.38 mA / cm 2 Charge to 4.2V and directly measure the resistance value (initial resistance) through impedance measurement.

[0188] <Cyclic performance test at 25°C> Charge-discharge tests were conducted at an ambient temperature of 25°C to evaluate cycle characteristics. The circuit was charged to 4.2V and discharged to 2.5V at a rate of 1.9mA / cm. 2 The current density was repeatedly charged and discharged. Then, the degradation of the battery cell was evaluated using the discharge capacity retention rate after 200 cycles. The discharge capacity retention rate after 200 cycles was calculated using the following formula. In addition, the discharge capacity of the first cycle in the cycle characteristic test at an ambient temperature of 25°C was set as the initial discharge capacity.

[0189] (Discharge capacity retention after 200 cycles) Discharge capacity retention after 200 cycles (%) = (Discharge capacity after 200 cycles / Initial discharge capacity) × 100 (Resistance value after 200 cycles) At 25℃, 0.38mA / cm 2 The non-aqueous electrolyte battery after the above cycle characteristic test was charged to 4.2V, and the resistance value (resistance value after 200 cycles) was measured directly by impedance measurement.

[0190] In Tables 5-10 below, the initial resistance value represents the relative value when Comparative Example 2-1 is set to 100, "E3" represents the discharge capacity retention rate after the cycle characteristic test at 25°C (the relative value when Comparative Example 2-1 is set to 100), and "E4" represents the resistance value after the cycle characteristic test at 25°C (the relative value when Comparative Example 2-1 is set to 100).

[0191] [Table 5] [Table 6] [Table 7] [Table 8] [Table 9] [Table 10] As shown in Tables 5-10, the initial resistance of the non-aqueous electrolyte battery containing the non-aqueous electrolyte of the embodiments is lower than that of the non-aqueous electrolyte battery containing the corresponding comparative examples. Furthermore, it is known that the E3 of the non-aqueous electrolyte battery containing the non-aqueous electrolyte of the embodiments is larger than that of the non-aqueous electrolyte battery containing the corresponding comparative examples, and the E4 of the non-aqueous electrolyte battery containing the non-aqueous electrolyte of the embodiments is smaller than that of the non-aqueous electrolyte battery containing the corresponding comparative examples.

[0192] If we focus on type (I), then according to the comparison of Examples 2-4 and 2-17 in Table 6, it can be seen that the initial resistance reduction effect of (1-1) is greater than that of (1-2).

[0193] If we focus on the type of compound (2), then according to the comparison of Examples 2-3 with Examples 2-13 with Examples 2-15, Examples 2-4 with Examples 2-14 with Examples 2-16, and Examples 2-17 with Examples 2-18 with Examples 2-19 in Table 6, it can be seen that the magnitude of the initial resistance reduction effect is (2-3) > (2-1) > (2-2).

[0194] Industrial applicability According to this application, a non-aqueous electrolyte that can reduce the initial resistance of a non-aqueous electrolyte battery and a non-aqueous electrolyte battery with low initial resistance can be provided.

[0195] Although this application has been described in detail with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made to this application without departing from the spirit and scope thereof.

[0196] This application is based on Japanese Patent Application No. 2023-123780, filed on July 28, 2023, the contents of which are incorporated herein by reference.

Claims

1. A non-aqueous electrolyte, comprising: (I) The compounds represented by the following general formula (1), (II) Select at least one compound from the group consisting of compounds (2) to (5) below. (III) Solute, and (IV) Non-aqueous organic solvents [Chemical Formula 1] ， In general formula (1), R 1 The alkylene group refers to an alkylene group having 1 to 6 carbon atoms, wherein oxygen atoms are optionally present between the carbon-carbon bonds in the alkylene group, and furthermore, any hydrogen atom in the alkylene group is optionally substituted with a halogen atom. Compound (2): at least one compound selected from the group consisting of compounds represented by general formula (2-A), compounds represented by general formula (2-B), and compounds represented by general formula (2-C). [Chemical Formula 2] ， In general formula (2-A), R 21 and R 22 Each of these groups independently represents an organic group or fluorine atom selected from the group consisting of alkoxy groups with 1 to 10 carbon atoms, alkenoxy groups with 2 to 10 carbon atoms, alkynoxy groups with 2 to 10 carbon atoms, cycloalkoxy groups with 3 to 10 carbon atoms, cycloalkenoxy groups with 3 to 10 carbon atoms, and aryloxy groups with 6 to 10 carbon atoms, wherein any hydrogen atom in the organic group is optionally replaced by a fluorine atom, and an oxygen atom is optionally present between the carbon-carbon bonds in the organic group. M1 m＋ It can be a proton, a metal cation, or an onium cation, where m represents the valence of the corresponding cation. Compounds represented by general formula (2-A) contain at least one PF bond. In general formula (2-B), X 21 The term "organic group" or "fluorine atom" is selected from the group consisting of alkyl (1-10 carbon atoms), alkenyl (2-10 carbon atoms), alkynyl (2-10 carbon atoms), cycloalkyl (3-10 carbon atoms), cycloalkenyl (3-10 carbon atoms), aryl (6-10 carbon atoms), alkoxy (1-10 carbon atoms), alkenyloxy (2-10 carbon atoms), alkynyloxy (2-10 carbon atoms), cycloalkoxy (3-10 carbon atoms), cycloalkenyloxy (3-10 carbon atoms), and aryloxy (6-10 carbon atoms), wherein any hydrogen atom in the organic group is optionally replaced by a fluorine atom, and an oxygen atom is optionally present between the carbon-carbon bonds in the organic group, wherein the organic group contains at least one fluorine atom. M1 m＋ It can be a proton, a metal cation, or an onium cation, where m represents the valence of the corresponding cation. In general formula (2-C), X 22 ~X 25 Each of the following groups independently represents an organic group or fluorine atom selected from the group consisting of alkyl (1-10 carbon atoms), alkenyl (2-10 carbon atoms), alkynyl (2-10 carbon atoms), cycloalkyl (3-10 carbon atoms), cycloalkenyl (3-10 carbon atoms), aryl (6-10 carbon atoms), alkoxy (1-10 carbon atoms), alkenyloxy (2-10 carbon atoms), alkynyloxy (2-10 carbon atoms), cycloalkoxy (3-10 carbon atoms), cycloalkenyloxy (3-10 carbon atoms), and aryloxy (6-10 carbon atoms), wherein any hydrogen atom in the organic group is optionally replaced by a fluorine atom, and an oxygen atom is optionally present between the carbon-carbon bonds in the organic group, wherein the organic group contains at least one fluorine atom, M1 m＋ The cation can be a proton, a metal cation, or an onium cation, where m represents the valence of the corresponding cation. Compounds represented by the general formula (2-C) contain at least one BF bond. Compound (3): The compound represented by the following general formula (3), [Chemical Formula 3] ， In general formula (3), R 31 This indicates a group with carbon-carbon unsaturated bonds, multiple R 31 Choose either the same or different from each other, R 32 The alkyl group represents an alkyl group having 1 to 10 fluorine atoms or carbon atoms, wherein the alkyl group optionally has at least one of fluorine atoms and oxygen atoms, and a plurality of R groups are present. 32 In the case of multiple R 32 Choose any two numbers that are the same or different from each other, where v represents an integer from 2 to 4. Compound (4): The compound represented by the following general formula (4), [Chemical Formula 4] ， In general formula (4), R 41 and R 42 Each of the following groups independently represents a hydrogen atom, an alkyl group with 1 to 2 carbon atoms, an alkenyl group with 2 to 5 carbon atoms, or an aryl group with 6 to 10 carbon atoms, wherein any hydrogen atom in the alkenyl group or the aryl group may be optionally substituted with a halogen atom, and n4 is 0 or 1. Compound (5): The compound represented by the following general formula (5), [Chemical Formula 5] ， In general formula (5), R 50 ~R 53 Each of the following can be independently represented as a hydrogen atom, a fluorine atom, an alkyl group with 1 to 5 carbon atoms, or a fluoroalkyl group with 1 to 4 carbon atoms, and n51 represents an integer from 1 to 3.

2. The non-aqueous electrolyte according to claim 1, wherein, The content of (I) relative to the total amount of the non-aqueous electrolyte is 0.01% by mass or more and 10% by mass or less.

3. The non-aqueous electrolyte according to claim 1 or 2, wherein, The content of (II) relative to the total amount of the non-aqueous electrolyte is 0.01% by mass or more and 10% by mass or less.

4. The non-aqueous electrolyte according to claim 1 or 2, wherein, The compound represented by the general formula (1) is at least one compound selected from the group consisting of 1,2-ethanedisulfonic anhydride and 1,3-propanedisulfonic anhydride.

5. The non-aqueous electrolyte according to claim 1 or 2, wherein, The compound (2) is at least one compound selected from the group consisting of lithium difluorophosphate, lithium fluorosulfonate, lithium trifluoromethanesulfonate and lithium tetrafluoroborate.

6. The non-aqueous electrolyte according to claim 1 or 2, wherein, The compound (3) is at least one compound selected from the group consisting of trivinylmethylsilane, trivinylfluorosilane and tetravinylsilane.

7. The non-aqueous electrolyte according to claim 1 or 2, wherein, The compound (4) is at least one compound selected from the group consisting of 1,3,2-dioxothiacyclopentane-2,2-dioxide and 1,3,2-dioxothiacyclohexane-2,2-dioxide.

8. The non-aqueous electrolyte according to claim 1 or 2, wherein, The (III) is at least one selected from the group consisting of LiPF6, LiSbF6, LiAsF6, LiClO4, LiN(CF3SO2)2, LiN(FSO2)2, LiN(POF2)2, LiCF3SO3, LiC4F9SO3, LiAlO2, LiAlCl4, LiCl and LiI, or at least one selected from the group consisting of NaPF6, NaSbF6, NaAsF6, NaClO4, NaN(CF3SO2)2, NaN(FSO2)2, NaN(POF2)2, NaCF3SO3, NaC4F9SO3, NaAlO2, NaAlCl4, NaCl and NaI.

9. The non-aqueous electrolyte according to claim 1 or 2, wherein, The (IV) comprises at least one selected from the group consisting of cyclic esters, chain esters, cyclic ethers, chain ethers, sulfone compounds, sulfoxide compounds and ionic liquids.

10. The non-aqueous electrolyte according to claim 9, wherein, The cyclic ester is a cyclic carbonate.

11. The non-aqueous electrolyte according to claim 10, wherein, The cyclic carbonate is at least one selected from the group consisting of ethylene carbonate, propylene carbonate, and fluoroethylene carbonate.

12. The non-aqueous electrolyte according to claim 9, wherein, The chain ester is a chain carbonate.

13. The non-aqueous electrolyte according to claim 12, wherein, The chain carbonate is at least one selected from the group consisting of methyl ethyl carbonate, dimethyl carbonate, diethyl carbonate, and methyl propyl carbonate.

14. A non-aqueous electrolyte battery, comprising at least a positive electrode, a negative electrode, a separator, and the non-aqueous electrolyte as described in claim 1 or 2.

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