Nonaqueous electrolyte solution, nonaqueous electrolyte battery, and method for producing nonaqueous electrolyte battery

Abstract

Provided are: a nonaqueous electrolyte solution which contains (I) a solute, (II) a nonaqueous organic solvent, and (III) at least one compound that is selected from the group consisting of a compound represented by general formula (1) and a compound represented by general formula (2); a nonaqueous electrolyte battery which includes the nonaqueous electrolyte solution; and a method for producing the nonaqueous electrolyte battery.

Description

Non-aqueous electrolyte, non-aqueous electrolyte battery, and method for manufacturing non-aqueous electrolyte battery

[0001] The present disclosure relates to a nonaqueous electrolyte, a nonaqueous electrolyte battery, and a method for manufacturing a nonaqueous electrolyte battery.

[0002] In recent years, there has been a rapid increase in demand for high-capacity, high-power, and high-energy-density batteries suitable for use in compact, high-energy-density energy storage systems for information-related and communication devices, such as personal computers, video cameras, digital cameras, mobile phones, and smartphones, as well as for use as auxiliary power sources in electric vehicles, hybrid vehicles, and fuel cell vehicles. Furthermore, there is a growing demand for batteries with long-term usability in large-scale energy storage systems for power storage applications. Non-aqueous electrolyte batteries, such as lithium-ion batteries, have been actively developed as candidates for these various energy storage systems. Non-aqueous electrolyte batteries typically contain a positive electrode, a negative electrode, and a non-aqueous electrolyte. To improve the durability of non-aqueous electrolyte batteries, optimization of various battery components, including the active materials of the positive and negative electrodes, has been explored. Non-aqueous electrolyte-related technologies are no exception, and various additives have been proposed to suppress degradation due to decomposition of the non-aqueous electrolyte on the surfaces of the active positive and negative electrodes. Patent Document 1 describes that the use of a nonaqueous electrolyte containing at least one of a dinitramide salt and a nitramide salt as a main electrolyte, a secondary electrolyte, or an additive provides cycle characteristics equivalent to those of lithium hexafluorophosphate, which is generally used as a main electrolyte, and also describes that when applied to a lithium-sulfur battery, the charge-discharge efficiency and self-discharge characteristics are improved.

[0003] US Patent Application Publication No. 2006 / 0154144

[0004] However, as a result of investigations by the inventors, it was found that the nonaqueous electrolyte containing lithium dinitramide used in the examples of Patent Document 1 leaves room for improvement in terms of high-temperature storage characteristics when used in a nonaqueous electrolyte battery. The present disclosure aims to provide a nonaqueous electrolyte that can exhibit excellent high-temperature storage characteristics when used in a nonaqueous electrolyte battery, and a method for manufacturing such a nonaqueous electrolyte battery. Another aim of the present disclosure is to provide a nonaqueous electrolyte battery having excellent high-temperature storage characteristics.

[0005] [1] A non-aqueous electrolyte solution comprising: (I) a solute; (II) a non-aqueous organic solvent; and (III) at least one compound selected from the group consisting of compounds represented by the following general formula (1) and compounds represented by the following general formula (2):

[0006]

[0007] [A in general formula (1)] １ is -N(H)- or -N － (M １ ＋ )-. M １ ＋ represents a metal cation or an onium cation. １ represents a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyloxy group having 2 to 10 carbon atoms, an aryloxy group having 6 to 15 carbon atoms, an OH group, or O － Mx ＋ , or N(Rx) ２ Represents Mx ＋ represents a metal cation or an onium cation. Each Rx independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or a fluorosulfonyl group. Multiple Rx's may be the same or different. Multiple Rx's may be bonded to each other.

[0008]

[0009] [A in general formula (2)] ２ is -N(H)- or -N － (M ２ ＋ )-. M ２ ＋ represents a metal cation or an onium cation. ２ and R ３each independently represents a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyloxy group having 2 to 10 carbon atoms, an aryloxy group having 6 to 15 carbon atoms, an OH group, or O － My ＋ , or N(Ry) ２ Represents My ＋ represents a metal cation or an onium cation. Each Ry independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or a fluorosulfonyl group. Multiple Ry's may be the same or different. Multiple Ry's may be bonded to each other.] [2] R in the general formula (1) １ is a fluorine atom, a methyl group, an ethyl group, an ethenyl group, a methoxy group, O － Mx ＋ , or N(Rx) ２ [3] The nonaqueous electrolyte solution according to [1], wherein R in the general formula (2) is ２ and R ３ At least one of the groups is a fluorine atom, a methyl group, an ethyl group, an ethenyl group, a methoxy group, or O － My ＋ , or N(Ry) ２ [4] The nonaqueous electrolyte solution according to [1], wherein A in the general formula (1) is １ is —N(H)— or —N － (M １ ＋ )- and M １ ＋ [5] The nonaqueous electrolyte solution according to [1] or [2], wherein A in the general formula (2) is a lithium ion or a sodium ion. ２ is —N(H)— or —N － (M ２ ＋ )- and M ２ ＋[6] The nonaqueous electrolyte solution according to any one of [1] to [5], wherein the concentration of (III) is 0.01 to 10 mass % relative to the total amount of the nonaqueous electrolyte solution. [7] The nonaqueous electrolyte solution according to [1] or [3], wherein (I) is LiPF ６ , LiBF ４ , LiSbF ６ , LiAsF ６ , LiClO ４ , LiN(SO ２ F) ２ , LiAlO ２ , LiAlCl ４ [8] The nonaqueous electrolyte solution according to any one of [1] to [6], wherein (I) is at least one selected from the group consisting of NaPF 6, LiCl 6, and LiI 6. ６ , NaBF ４ , NaSbF ６ , NaAsF ６ , NaClO ４ , NaN(SO ２ F) ２ , NaAlO ２ , NaAlCl ４, NaCl, and NaI. [9] The nonaqueous electrolyte solution according to any one of [1] to [6], wherein (II) comprises at least one selected from the group consisting of a cyclic ester, a chain ester, a cyclic ether, a chain ether, a sulfone compound, a sulfoxide compound, and an ionic liquid.

[10] The nonaqueous electrolyte solution according to [9], wherein the cyclic ester comprises a cyclic carbonate.

[11] The nonaqueous electrolyte solution according to

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

[12] The nonaqueous electrolyte solution according to [9], wherein the chain ester comprises a chain carbonate.

[13] The nonaqueous electrolyte solution according to

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

[14] The nonaqueous electrolyte solution according to [9], wherein the cyclic ether comprises at least one selected from the group consisting of tetrahydrofuran, 2-methyltetrahydrofuran, furan, tetrahydropyran, 1,3-dioxane, 1,4-dioxane, 1,3-dioxolane, and trioxane.

[15] The nonaqueous electrolyte solution according to

[12] , wherein the chain ether comprises at least one selected from the group consisting of diethyl ether, dipropyl ether, diisopropyl ether, dibutyl ether, dimethoxymethane, trimethoxymethane, 1,The nonaqueous electrolyte solution according to [9], which contains at least one selected from the group consisting of 2-dimethoxyethane, diethoxyethane, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether.

[16] Further, cyclohexylbenzene, cyclohexylfluorobenzene, biphenyl, 2-fluorobiphenyl, tert-butylbenzene, tert-amylbenzene, 2-fluorotoluene, fluorobenzene, difluoroanisole, vinylene carbonate, vinylene carbonate oligomer (having a number average molecular weight of 170 to 5000 in terms of polystyrene), vinylethylene carbonate, divinylethylene carbonate, fluoroethylene carbonate, ethynylethylene carbonate, trans-difluoroethylene carbonate, methylpropargyl carbonate, ethylpropargyl carbonate, dipropargyl carbonate, dimethylvinylene carbonate, dimethyl dicarbonate, bis(1,1,1,3,3,3-hexafluoro- 1-propyl) carbonate, bis(2,2,2-trifluoroethyl) carbonate, 1,6-diisocyanatohexane, maleic anhydride, succinic anhydride, 1,4-dioxane-2,6-dione, glutaric anhydride, methanedisulfonic anhydride, 1,3-propane sultone, 1,3-propene sultone, 1,4-butane sultone, 2,4-butane sultone, 1,3,2-dioxathiolane-2,2-dioxide, 4-propyl-1,3,2-dioxathiolane-2,2-dioxide, methylenemethane disulfonate, dimethylenemethane disulfonate, trimethylenemethane disulfonate, methyl methanesulfonate, methanesulfonyl fluoride, ethenesulfonyl fluoride, 1,2-ethanedisulfonic anhydride, methanesulfonic anhydride, N,N'-carbonylbis(N-methylsulfamoyl fluoride), difluoro(picolinato)borate, phenyl difluorophosphate, tripropargyl phosphate, tetrafluoro(picolinato)phosphate, (ethoxy)pentafluorocyclotriphosphazene, succinonitrile, methyldifluorovinylsilane, methylfluorodivinylsilane, dimethyldivinylsilane, trivinylmethylsilane, trivinylfluorosilane, tetravinylsilane, tris(trimethylsilyl)borate, tris(trimethylsilyl)phosphate, 1,3-dimethyl-1,3-divinyl-1,3-di(1,1,1,3,3,3-Hexafluoroisopropyl)disiloxane, fluorosulfonate, trifluoromethanesulfonate, pentafluoroethanesulfonate, nonafluorobutanesulfonate, monomethyl sulfate, monoethyl sulfate, bis(trifluoromethanesulfonyl)imide salt, bis(pentafluoroethanesulfonyl)imide salt, (trifluoromethanesulfonyl)(nonafluorobutanesulfonyl)imide salt, (trifluoromethanesulfonyl)(pentafluoroethanesulfonyl)imide salt, (trifluoromethanesulfonyl)(fluorosulfonyl)imide salt, (pentafluoroethanesulfonyl)(fluorosulfonyl)imide salt, (difluorophosphoryl)(fluorosulfonyl)imide salt, (difluorophosphoryl)(fluorosulfonyl)imide salt, The nonaqueous electrolyte solution according to any one of [1] to

[15] , which contains at least one selected from the group consisting of a bis(difluorophosphoryl)imide salt, a bis(difluorophosphoryl)imide salt, a monofluorophosphate, a difluorophosphate, a tetrafluoro(malonato)phosphate, a tris(oxalato)phosphate, a difluorobis(oxalato)phosphate, a tetrafluorooxalatophosphate, a bis(oxalato)borate, a difluorooxalatoborate, a difluoro(malonato)borate, a tris(trifluoromethanesulfonyl)methide salt, a tris(fluorosulfonyl)methide salt, an acrylate, a methacrylate, a nitrate, a nitrite, hexafluoroisopropanol, and trifluoroethanol.

[17] A nonaqueous electrolyte battery comprising at least a positive electrode, a negative electrode, and the nonaqueous electrolyte solution according to any one of [1] to

[16] .

[18] The nonaqueous electrolyte battery according to

[17] , wherein the negative electrode contains at least one of an alkali metal, an alkali metal alloy, and a material that intercalates an alkali metal.

[19] A method for producing a nonaqueous electrolyte battery, comprising a step of injecting the nonaqueous electrolyte according to any one of [1] to

[16] .

[0010] According to the present disclosure, it is possible to provide a nonaqueous electrolyte that can exhibit excellent high-temperature storage characteristics when used in a nonaqueous electrolyte battery, a method for manufacturing the nonaqueous electrolyte battery, and a nonaqueous electrolyte battery having excellent high-temperature storage characteristics.

[0011] In this specification, the word "to" is used to mean that the numerical values ​​before and after it are included as the lower limit and upper limit.

[0012] The present disclosure will be described in detail below, but the following description of the constituent elements is an example of an embodiment of the present disclosure, and the present disclosure is not limited to these specific contents.

[0013] 1. Regarding the Non-Aqueous Electrolyte The non-aqueous electrolyte of the present disclosure contains (I) a solute, (II) a non-aqueous organic solvent, and (III) at least one compound selected from the group consisting of compounds represented by the following general formula (1) and compounds represented by the following general formula (2):

[0014]

[0015] [A in general formula (1)] １ is -N(H)- or -N － (M １ ＋ )-. M １ ＋ represents a metal cation or an onium cation. １ represents a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyloxy group having 2 to 10 carbon atoms, an aryloxy group having 6 to 15 carbon atoms, an OH group, or O － Mx ＋ , or N(Rx) ２ Represents Mx ＋ represents a metal cation or an onium cation. Each Rx independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or a fluorosulfonyl group. Multiple Rx's may be the same or different. Multiple Rx's may be bonded to each other.

[0016]

[0017] [A in general formula (2)] ２ is -N(H)- or -N － (M ２ ＋ )-. M ２＋ represents a metal cation or an onium cation. ２ and R ３ each independently represents a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyloxy group having 2 to 10 carbon atoms, an aryloxy group having 6 to 15 carbon atoms, an OH group, or O － My ＋ , or N(Ry) ２ Represents My ＋ represents a metal cation or an onium cation. Each Ry independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or a fluorosulfonyl group. Multiple Rys may be the same or different. Multiple Rys may be bonded to each other.]

[0018] <Regarding (I) Solute> The solute (I) (also referred to as "(I)") contained in the nonaqueous electrolyte solution of the present disclosure will be described. The solute (I) can be any of various solutes that have been conventionally used in the field of such nonaqueous electrolyte solutions, without any particular limitations. Such a solute is preferably an ionic salt consisting of any pair of cation and anion. Various solutes can be used without any particular limitations as long as they exist in an ionic state as a cation and an anion in a nonaqueous organic solvent. Such a solute is preferably an ionic salt consisting of a pair of at least one cation selected from the group consisting of alkali metal ions such as lithium ions and sodium ions, alkaline earth metal ions, and quaternary ammonium, and at least one anion selected from the group consisting of hexafluorophosphate anion, tetrafluoroborate anion, hexafluoroantimonate anion, hexafluoroarsenate anion, perchlorate anion, bis(fluorosulfonyl)imide anion, aluminate anion, tetrachloroaluminate anion, chloride ion, and iodide ion. Specifically, LiPF ６ , LiBF ４ , LiSbF ６, LiAsF ６ , LiClO ４ , LiN(SO ２ F) ２ , LiAlO ２ , LiAlCl ４ , LiCl and LiI, or NaPF ６ , NaBF ４ , NaSbF ６ , NaAsF ６ , NaClO ４ , NaN(SO ２ F) ２ , NaAlO ２ , NaAlCl ４ At least one selected from the group consisting of NaCl and NaI can be preferably mentioned.

[0019] In particular, in consideration of the energy density, output characteristics, life, and the like of the nonaqueous electrolyte battery, it is preferable that the cation is at least one selected from the group consisting of lithium ions, sodium ions, potassium ions, magnesium ions, and quaternary ammonium cations, and that the anion is at least one selected from the group consisting of hexafluorophosphate anions, tetrafluoroborate anions, and bis(fluorosulfonyl)imide anions.

[0020] In the nonaqueous electrolyte solution of the present disclosure, as (I), one type of compound may be used alone, or two or more types of compounds may be mixed in any combination and ratio depending on the application.

[0021] The concentration of (I) relative to the total amount of the nonaqueous electrolyte is not particularly limited. For example, the lower limit of the concentration of (I) may be 0.5 mol / L or more, 0.7 mol / L or more, or 0.9 mol / L or more. The upper limit of the concentration of (I) may be 5 mol / L or less, 4 mol / L or less, or 2 mol / L or less. A concentration of 0.5 mol / L or more is preferable because the ionic conductivity is less likely to decrease, and the cycle characteristics and output characteristics of the nonaqueous electrolyte battery are less likely to decrease. On the other hand, a concentration of 5 mol / L or less is preferable because the viscosity of the nonaqueous electrolyte is less likely to increase, and the ionic conductivity is less likely to decrease. Note that when two or more types of (I) are used, it is preferable that the total concentration of these solutes is in the above-mentioned range.

[0022] The temperature of the solution when (I) is dissolved in (II) the nonaqueous organic solvent is not particularly limited, but may be −20 to 80° C. or 0 to 60° C. Furthermore, the cation of the solute is more preferably a lithium ion when used in a lithium ion battery, and more preferably a sodium ion when used in a sodium ion battery.

[0023] <Regarding (II) Non-aqueous Organic Solvent> The non-aqueous organic solvent (II) (also referred to as "(II)") contained in the non-aqueous electrolyte solution of the present disclosure will be described. The type of non-aqueous organic solvent (II) is not particularly limited, and any non-aqueous organic solvent can be used. Such non-aqueous organic solvent preferably contains at least one selected from the group consisting of cyclic esters, chain esters, cyclic ethers, chain ethers, sulfone compounds, sulfoxide compounds, amide compounds, nitrile compounds, and ionic liquids, and more preferably contains at least one selected from the group consisting of cyclic esters, chain esters, cyclic ethers, chain ethers, sulfone compounds, sulfoxide compounds, and ionic liquids. Note that cyclic carbonates are a sub-concept of cyclic esters, and chain carbonates are a sub-concept of chain esters. Specific examples of the non-aqueous organic solvent (II) include the following non-aqueous organic solvents. Examples of cyclic esters include cyclic carbonates such as propylene carbonate (hereinafter sometimes referred to as "PC"), ethylene carbonate (hereinafter sometimes referred to as "EC"), and butylene carbonate, as well as γ-butyrolactone and γ-valerolactone. Examples of chain esters include diethyl carbonate (hereinafter sometimes referred to as "DEC"), dimethyl carbonate (hereinafter sometimes referred to as "DMC"), ethyl methyl carbonate (hereinafter sometimes referred to as "EMC"), methyl propyl carbonate, ethyl propyl carbonate, methyl butyl carbonate, 2,2,2-trifluoroethyl methyl carbonate, 2,2,2-trifluoroethyl ethyl carbonate, and 2,2,2-trifluoroethyl propyl carbonate. In addition to chain carbonates such as 1,1,1,3,3,3-hexafluoro-1-propylmethyl carbonate, 1,1,1,3,3,3-hexafluoro-1-propylethyl carbonate, and 1,1,1,3,3,3-hexafluoro-1-propylpropyl carbonate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate (hereinafter sometimes referred to as "EP"), methyl 2-fluoropropionate, and ethyl 2-fluoropropionate.Examples of cyclic ethers include tetrahydrofuran, 2-methyltetrahydrofuran, furan, tetrahydropyran, 1,3-dioxane, 1,4-dioxane, 1,3-dioxolane, and trioxane. Examples of chain ethers include diethyl ether, dipropyl ether, diisopropyl ether, dibutyl ether, dimethoxymethane, trimethoxymethane, 1,2-dimethoxyethane, diethoxyethane, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether. Other examples include sulfone compounds and sulfoxide compounds such as dimethyl sulfoxide and sulfolane, N,N-dimethylformamide, acetonitrile, and propionitrile. Other examples include ionic liquids.

[0024] (II) The nonaqueous 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.

[0025] The cyclic ester may include a cyclic carbonate, and the cyclic carbonate may include at least one selected from the group consisting of ethylene carbonate and propylene carbonate.

[0026] The chain ester may include a chain carbonate, and the chain carbonate may include at least one selected from the group consisting of ethyl methyl carbonate, dimethyl carbonate, diethyl carbonate, and methyl propyl carbonate.

[0027] The cyclic ether may include at least one selected from the group consisting of tetrahydrofuran, 2-methyltetrahydrofuran, furan, tetrahydropyran, 1,3-dioxane, 1,4-dioxane, 1,3-dioxolane, and trioxane.

[0028] The chain ether may include at least one selected from the group consisting of diethyl ether, dipropyl ether, diisopropyl ether, dibutyl ether, dimethoxymethane, trimethoxymethane, 1,2-dimethoxyethane, diethoxyethane, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether.

[0029] The nonaqueous electrolyte solution of the present disclosure may use one type of compound alone as (II), or two or more types of compounds may be mixed in any combination and ratio depending on the application. Among these, from the viewpoints of electrochemical stability against oxidation-reduction and chemical stability related to heat and reactions with the solute, it is particularly preferable to include at least one selected from the group consisting of PC, EC, DEC, DMC, and EMC.

[0030] Furthermore, it is preferable that the nonaqueous organic solvent contains, for example, one or more cyclic carbonates having a high dielectric constant and one or more chain carbonates or chain esters having a low liquid viscosity, since this increases the ionic conductivity of the electrolyte solution. Specifically, it is more preferable to use a nonaqueous organic solvent containing the following combinations: (1) Combination of EC and EMC, (2) Combination of EC and DEC, (3) Combination of EC, DMC and EMC, (4) Combination of EC, DEC and EMC, (5) Combination of EC, EMC and EP, (6) Combination of PC and DEC, (7) Combination of PC and EMC, (8) Combination of PC and EP, (9) Combination of PC, DMC and EMC, (10) Combination of PC, DEC and EMC, (11) Combination of PC, DEC and EP, (12) Combination of PC, EC and EMC, (13) Combination of PC, EC, DMC and EMC, (14) Combination of PC, EC, DEC and EMC, (15) Combination of PC, EC, EMC and EP

[0031] The concentration of the nonaqueous organic solvent in the present disclosure is not particularly limited as long as it functions as a nonaqueous organic solvent, but may be, for example, 40 to 99 mass %, preferably 50 to 95 mass %, and particularly preferably 70 to 93 mass %, relative to the total amount (100 mass %) of the nonaqueous electrolyte solution.

[0032] The content of the cyclic carbonate is not particularly limited and may be any content as long as it does not significantly impair the effects of the present disclosure. However, when one type is used alone, the content may be 3 vol% or more, more preferably 5 vol% or more, based on 100 vol% of the nonaqueous organic solvent. By setting the content within this range, a decrease in electrical conductivity due to a decrease in the dielectric constant of the nonaqueous electrolyte can be avoided, and the large-current discharge characteristics, stability with respect to the negative electrode, and cycle characteristics of the nonaqueous electrolyte battery can be easily maintained within good ranges. The content may also be 90 vol% or less, preferably 85 vol% or less, and more preferably 80 vol% or less. Setting the content within this range allows the viscosity of the nonaqueous electrolyte to be within an appropriate range, suppresses a decrease in ionic conductivity, and ultimately facilitates the load characteristics of the nonaqueous electrolyte battery to be easily maintained within good ranges.

[0033] Furthermore, any combination of two or more cyclic carbonates can be used. 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, and particularly preferably 95:5 to 50:50. Furthermore, the amount of propylene carbonate relative to the total nonaqueous organic solvent is not particularly limited and may be any amount as long as it does not significantly impair the effects of the present disclosure. However, it may be 1% by volume or more, preferably 2% by volume or more, more preferably 3% by volume or more, or 30% by volume or less, preferably 25% by volume or less, and more preferably 20% by volume or less. When propylene carbonate is contained in this range, for example, in the case of combining ethylene carbonate with a dialkyl carbonate, this is preferred because it maintains the properties of the combination of ethylene carbonate and a dialkyl carbonate while providing even better low-temperature properties.

[0034] The chain ester may be used alone or in any combination and ratio of two or more. The content of the chain ester is not particularly limited, but may be 15% by volume or more, preferably 20% by volume or more, more preferably 25% by volume or more, and may be 90% by volume or less, preferably 85% by volume or less, more preferably 80% by volume or less, based on 100% by volume of the nonaqueous organic solvent. By setting the content of the chain ester within the above range, the viscosity of the nonaqueous electrolyte can be set to an appropriate range, a decrease in ionic conductivity can be suppressed, and the input / output characteristics and charge / discharge rate characteristics of the nonaqueous electrolyte battery can be easily set to good ranges. Furthermore, a decrease in electrical conductivity due to a decrease in the dielectric constant of the nonaqueous electrolyte can be avoided, and the input / output characteristics and charge / discharge rate characteristics of the nonaqueous electrolyte battery can be easily set to good ranges. Furthermore, by combining a specific chain ester with ethylene carbonate at a specific content, battery performance can be significantly improved.

[0035] For example, when dimethyl carbonate, ethyl methyl carbonate, or a mixture of dimethyl carbonate and ethyl methyl carbonate is selected as the specific chain ester, the content of ethylene carbonate is not particularly limited and may be any content as long as it does not significantly impair the effects of the present disclosure, but may be 5% by volume or more, preferably 10% by volume or more, or 45% by volume or less, preferably 40% by volume or less. The content of dimethyl carbonate may be 20% by volume or more, preferably 30% by volume or more, or 50% by volume or less, preferably 45% by volume or less. The content of ethyl methyl carbonate may be 20% by volume or more, preferably 30% by volume or more, or 50% by volume or less, preferably 45% by volume or less. By setting the content within the above range, the low-temperature deposition temperature of the electrolyte is lowered, while also reducing the viscosity of the nonaqueous electrolyte, improving ionic conductivity and making it easier to obtain high input / output even at low temperatures.

[0036] The content of the chain ether is not particularly limited and may be any content as long as it does not significantly impair the effects of the present disclosure. It may be 1% by volume or more, preferably 2% by volume or more, more preferably 3% by volume or more, or 30% by volume or less, preferably 25% by volume or less, more preferably 20% by volume or less, based on 100% by volume of the nonaqueous organic solvent. If the content of the chain ether is within the above range, for example, in the case of a lithium-ion battery in which the cation is mainly lithium, it is easy to ensure the effect of improving the degree of lithium ion dissociation of the chain ether and improving ionic conductivity due to reduced viscosity. Furthermore, when the negative electrode active material is a carbonaceous material, the phenomenon of co-intercalation of the chain ether with lithium ions can be suppressed, making it easier to maintain the input / output characteristics and charge / discharge rate characteristics within appropriate ranges.

[0037] The content of the sulfone compound is not particularly limited and may be any content as long as it does not significantly impair the effects of the present disclosure, but may be 0.3 vol% or more, preferably 0.5 vol% or more, more preferably 1 vol% or more, and may be 40 vol% or less, preferably 35 vol% or less, more preferably 30 vol% or less, relative to 100 vol% of the nonaqueous organic solvent. If the content of the sulfone compound is within the above range, it is easy to obtain an effect of improving durability such as cycle characteristics and storage characteristics, and it is also possible to keep the viscosity of the nonaqueous electrolyte within an appropriate range, avoid a decrease in electrical conductivity, and make it easy to keep the input / output characteristics and charge / discharge rate characteristics of the nonaqueous electrolyte battery within appropriate ranges.

[0038] <Regarding (III)> The nonaqueous electrolyte solution of the present disclosure contains (III) at least one compound selected from the group consisting of compounds represented by the following general formula (1) and compounds represented by the following general formula (2) (also referred to as "(III)"):

[0039]

[0040] [A in general formula (1)] １ is -N(H)- or -N － (M １ ＋ )-. M １ ＋represents a metal cation or an onium cation. １ represents a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyloxy group having 2 to 10 carbon atoms, an aryloxy group having 6 to 15 carbon atoms, an OH group, or O － Mx ＋ , or N(Rx) ２ Represents Mx ＋ represents a metal cation or an onium cation. Each Rx independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or a fluorosulfonyl group. Multiple Rx's may be the same or different. Multiple Rx's may be bonded to each other.

[0041]

[0042] [A in general formula (2)] ２ is -N(H)- or -N － (M ２ ＋ )-. M ２ ＋ represents a metal cation or an onium cation. ２ and R ３ each independently represents a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyloxy group having 2 to 10 carbon atoms, an aryloxy group having 6 to 15 carbon atoms, an OH group, or O － My ＋ , or N(Ry) ２ Represents My ＋ represents a metal cation or an onium cation. Each Ry independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or a fluorosulfonyl group. Multiple Rys may be the same or different. Multiple Rys may be bonded to each other.]

[0043] The compound represented by general formula (1) will be explained.１ is -N(H)- or -N － (M １ ＋ )-. M １ ＋ represents a metal cation or an onium cation. Examples of metal cations include alkali metal ions and alkaline earth metal ions, and specific examples include lithium ions, sodium ions, potassium ions, and magnesium ions. Examples of onium cations include quaternary ammonium cations. A in general formula (1) １ is —N(H)— or —N － (M １ ＋ )- and M １ ＋ is preferably a lithium ion or a sodium ion.

[0044] R in general formula (1) １ represents a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyloxy group having 2 to 10 carbon atoms, an aryloxy group having 6 to 15 carbon atoms, an OH group, or O － Mx ＋ , or N(Rx) ２ Represents R １ The alkyl group having 1 to 10 carbon atoms represented by may be linear or branched, and preferably has 1 to 5 carbon atoms. Examples of such alkyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, n-pentyl, n-hexyl, n-octyl, and n-decyl groups. The alkyl group having 1 to 10 carbon atoms preferably does not have a substituent (i.e., it is preferably an unsubstituted alkyl group having 1 to 10 carbon atoms). R １The alkoxy group having 1 to 10 carbon atoms represented by may be linear or branched, and preferably has 1 to 5 carbon atoms. Examples of such an alkoxy group include a methoxy group, an ethoxy group, an n-propyloxy group, an isopropyloxy group, an n-butyloxy group, a sec-butyloxy group, a tert-butyloxy group, an n-pentyloxy group, an n-hexyloxy group, an n-octyloxy group, and an n-decyloxy group. The alkoxy group having 1 to 10 carbon atoms may have a substituent. R １ The alkenyl group having 2 to 10 carbon atoms represented by R may be a straight-chain or branched-chain alkenyl group, and is preferably an alkenyl group having 2 to 5 carbon atoms. The alkenyl group may have two or more unsaturated bonds. Suitable examples of such alkenyl groups include vinyl, 1-propenyl, 2-propenyl, 1-methylvinyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-methylpropenyl, 1-pentenyl, and 1,3-butadienyl. The alkenyl group having 2 to 10 carbon atoms may have a substituent. R １ Examples of the alkenyloxy group having 2 to 10 carbon atoms represented by include linear or branched alkenyloxy groups, and are preferably alkenyloxy groups having 2 to 5 carbon atoms. The alkenyloxy group may have two or more unsaturated bonds. Suitable examples of such alkenyloxy groups include vinyloxy groups, 1-propenyloxy groups, 2-propenyloxy groups, 1-methylvinyloxy groups, 1-butenyloxy groups, 2-butenyloxy groups, 3-butenyloxy groups, 1-methylpropenyloxy groups, 1-pentenyloxy groups, and 1,3-butadienyloxy groups. The alkenyloxy group having 2 to 10 carbon atoms may have a substituent. R １The alkynyloxy group having 2 to 10 carbon atoms represented by R may be a straight-chain or branched-chain alkynyloxy group, and is preferably an alkynyloxy group having 2 to 5 carbon atoms. The alkynyloxy group may have two or more unsaturated bonds. Suitable examples of such alkynyloxy groups include an ethynyloxy group, a 1-propynyloxy group, a 2-propynyloxy group, a 1-methylethynyloxy group, a 1-butynyloxy group, a 2-butynyloxy group, a 3-butynyloxy group, a 1-methylpropynyloxy group, and a 1-pentynyloxy group. The alkynyloxy group having 2 to 10 carbon atoms may have a substituent. R １ Suitable examples of the aryloxy group having 6 to 15 carbon atoms represented by R include a phenyloxy group and a naphthyloxy group. Aryloxy groups also include those having a linking group such as a methylene group, and suitable examples include a benzyloxy group. The aryloxy group having 6 to 15 carbon atoms may have a substituent. R １ is a fluorine atom, a methyl group, an ethyl group, an ethenyl group, a methoxy group, O － Mx ＋ , or N(Rx) ２ In one preferred embodiment,

[0045] Mx ＋ represents a metal cation or an onium cation. Examples of metal cations include alkali metal ions and alkaline earth metal ions, specifically lithium ions, sodium ions, potassium ions, magnesium ions, etc. Examples of onium cations include quaternary ammonium cations, etc.

[0046] Each Rx independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or a fluorosulfonyl group. The alkyl group having 1 to 10 carbon atoms represented by Rx may be linear or branched, and preferably has 1 to 5 carbon atoms. Examples of such alkyl groups include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, an n-octyl group, and an n-decyl group. The alkyl group having 1 to 10 carbon atoms may have a substituent. The alkenyl group having 2 to 10 carbon atoms represented by Rx includes a linear or branched alkenyl group, and preferably has 2 to 5 carbon atoms. In addition, the alkenyl group may have two or more unsaturated bonds. Suitable examples of such alkenyl groups include vinyl, 1-propenyl, 2-propenyl, 1-methylvinyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-methylpropenyl, 1-pentenyl, and 1,3-butadienyl groups. The alkenyl group having 2 to 10 carbon atoms may have a substituent. The alkynyl group having 2 to 10 carbon atoms represented by Rx includes linear or branched alkynyl groups, and is preferably an alkynyl group having 2 to 5 carbon atoms. The alkynyl group may also have two or more unsaturated bonds. Suitable examples of such alkynyl groups include ethynyl, 1-propynyl, 2-propynyl, 1-methylethynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-methylpropynyl, and 1-pentynyl groups. The alkynyl group having 2 to 10 carbon atoms may have a substituent.

[0047] Multiple Rx's may be the same or different. Multiple Rx's may be bonded to each other. When multiple Rx's are bonded to each other, they may form a 3- to 10-membered ring or a 5- to 8-membered ring containing a nitrogen atom as a ring member. The ring may have a substituent.

[0048] Specific examples of the compound represented by general formula (1) are shown below, but the compound is not limited to these. １"-" is the same as "-N" in the general formula (1). － (M １ ＋ )-" is synonymous with "

[0049]

[0050] The compound represented by general formula (2) will be explained. ２ is -N(H)- or -N － (M ２ ＋ )-. M ２ ＋ represents a metal cation or an onium cation. Examples of metal cations include alkali metal ions and alkaline earth metal ions, and specific examples include lithium ions, sodium ions, potassium ions, and magnesium ions. Examples of onium cations include quaternary ammonium cations. A in general formula (2) ２ is —N(H)— or —N － (M ２ ＋ )- and M ２ ＋ is preferably a lithium ion or a sodium ion.

[0051] R in general formula (2) ２ and R ３ each independently represents a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyloxy group having 2 to 10 carbon atoms, an aryloxy group having 6 to 15 carbon atoms, an OH group, or O － My ＋ , or N(Ry) ２ Represents R ２ and R ３ may be the same or different. ２ and R ３The alkyl group having 1 to 10 carbon atoms represented by may be a straight chain or branched chain, and preferably has 1 to 5 carbon atoms. Examples of such an alkyl group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, an n-octyl group, and an n-decyl group. The alkyl group having 1 to 10 carbon atoms may have a substituent. R ２ and R ３ The alkoxy group having 1 to 10 carbon atoms represented by may be linear or branched, and preferably has 1 to 5 carbon atoms. Examples of such an alkoxy group include a methoxy group, an ethoxy group, an n-propyloxy group, an isopropyloxy group, an n-butyloxy group, a sec-butyloxy group, a tert-butyloxy group, an n-pentyloxy group, an n-hexyloxy group, an n-octyloxy group, and an n-decyloxy group. The alkoxy group having 1 to 10 carbon atoms may have a substituent. R ２ and R ３ The alkenyl group having 2 to 10 carbon atoms represented by R may be a straight-chain or branched-chain alkenyl group, and is preferably an alkenyl group having 2 to 5 carbon atoms. The alkenyl group may have two or more unsaturated bonds. Suitable examples of such alkenyl groups include vinyl, 1-propenyl, 2-propenyl, 1-methylvinyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-methylpropenyl, 1-pentenyl, and 1,3-butadienyl. The alkenyl group having 2 to 10 carbon atoms may have a substituent. R ２ and R ３Examples of the alkenyloxy group having 2 to 10 carbon atoms represented by include linear or branched alkenyloxy groups, and are preferably alkenyloxy groups having 2 to 5 carbon atoms. The alkenyloxy group may have two or more unsaturated bonds. Suitable examples of such alkenyloxy groups include vinyloxy groups, 1-propenyloxy groups, 2-propenyloxy groups, 1-methylvinyloxy groups, 1-butenyloxy groups, 2-butenyloxy groups, 3-butenyloxy groups, 1-methylpropenyloxy groups, 1-pentenyloxy groups, and 1,3-butadienyloxy groups. The alkenyloxy group having 2 to 10 carbon atoms may have a substituent. R ２ and R ３ The alkynyloxy group having 2 to 10 carbon atoms represented by R may be a straight-chain or branched-chain alkynyloxy group, and is preferably an alkynyloxy group having 2 to 5 carbon atoms. The alkynyloxy group may have two or more unsaturated bonds. Suitable examples of such alkynyloxy groups include an ethynyloxy group, a 1-propynyloxy group, a 2-propynyloxy group, a 1-methylethynyloxy group, a 1-butynyloxy group, a 2-butynyloxy group, a 3-butynyloxy group, a 1-methylpropynyloxy group, and a 1-pentynyloxy group. The alkynyloxy group having 2 to 10 carbon atoms may have a substituent. R ２ and R ３ Suitable examples of the aryloxy group having 6 to 15 carbon atoms represented by R include a phenyloxy group and a naphthyloxy group. Aryloxy groups also include those having a linking group such as a methylene group, and suitable examples include a benzyloxy group. The aryloxy group having 6 to 15 carbon atoms may have a substituent. R ２ and R ３ At least one of the groups is a fluorine atom, a methyl group, an ethyl group, an ethenyl group, a methoxy group, or O － My ＋ , or N(Ry) ２ In one preferred embodiment,

[0052] My ＋represents a metal cation or an onium cation. Examples of metal cations include alkali metal ions and alkaline earth metal ions, specifically lithium ions, sodium ions, potassium ions, magnesium ions, etc. Examples of onium cations include quaternary ammonium cations, etc.

[0053] Each Ry independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or a fluorosulfonyl group. The alkyl group having 1 to 10 carbon atoms represented by Ry may be linear or branched, and preferably has 1 to 5 carbon atoms. Examples of such alkyl groups include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, an n-octyl group, and an n-decyl group. The alkyl group having 1 to 10 carbon atoms may have a substituent. The alkenyl group having 2 to 10 carbon atoms represented by Ry includes a linear or branched alkenyl group, and preferably has 2 to 5 carbon atoms. In addition, the alkenyl group may have two or more unsaturated bonds. Suitable examples of such alkenyl groups include vinyl, 1-propenyl, 2-propenyl, 1-methylvinyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-methylpropenyl, 1-pentenyl, and 1,3-butadienyl groups. The alkenyl group having 2 to 10 carbon atoms may have a substituent. The alkynyl group having 2 to 10 carbon atoms represented by Ry includes linear or branched alkynyl groups, and is preferably an alkynyl group having 2 to 5 carbon atoms. The alkynyl group may also have two or more unsaturated bonds. Suitable examples of such alkynyl groups include ethynyl, 1-propynyl, 2-propynyl, 1-methylethynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-methylpropynyl, and 1-pentynyl groups. The alkynyl group having 2 to 10 carbon atoms may have a substituent.

[0054] Multiple Ry's may be the same or different. Multiple Ry's may be bonded to each other. When multiple Ry's are bonded to each other, they may form a 3- to 10-membered ring or a 5- to 8-membered ring containing a nitrogen atom as a ring member. The ring may have a substituent.

[0055] Specific examples of the compound represented by general formula (2) are shown below, but are not limited to these. ２ "-" is the same as "-N" in the general formula (2). － (M ２ ＋ )-" is synonymous with "

[0056]

[0057] The content of (III) in the nonaqueous electrolyte solution of the present disclosure may be 0.01% by mass or more and 10% by mass or less, 0.07% by mass or more and 5.5% by mass or less, or 0.08% by mass or more and 5% by mass or less, relative to the total amount of the nonaqueous electrolyte solution.

[0058] <Regarding Other Components That May Be Included> The nonaqueous electrolyte solution of the present disclosure is configured using the above-described components as basic constituents, but the nonaqueous electrolyte solution of the present disclosure may contain the components described below (hereinafter also referred to as "other components that may be included" or "other components") in any combination and ratio, as long as the gist of the present disclosure is not impaired. As the other components, for example, other additives commonly used in this technical field may be added in any ratio.

[0059] Other components include, for example, aromatic compounds such as cyclohexylbenzene, cyclohexylfluorobenzene, biphenyl, 2-fluorobiphenyl, tert-butylbenzene, tert-amylbenzene, 2-fluorotoluene, fluorobenzene, and difluoroanisole, vinylene carbonate (hereinafter sometimes referred to as "VC"), vinylene carbonate oligomers (having a number average molecular weight of 170 to 5,000 in terms of polystyrene), vinylethylene carbonate, divinylethylene carbonate, fluoroethylene carbonate (hereinafter sometimes referred to as "FEC"), ethynylethylene carbonate, trans-difluoroethylene carbonate, methylpropargyl carbonate, ethylpropargyl carbonate, dipropargyl carbonate, dimethylvinylene carbonate, dimethyldicarbonate, bis(1,1,1,3 ,3,3-hexafluoro-1-propyl)carbonate, bis(2,2,2-trifluoroethyl)carbonate, etc.; isocyanate compounds such as 1,6-diisocyanatohexane, etc.; organic acid anhydrides such as maleic anhydride, succinic anhydride, 1,4-dioxane-2,6-dione, glutaric anhydride, methanedisulfonic anhydride, etc.; 1,3-propane sultone, 1,3-propene sultone, 1,4-butane sultone, etc. t, 2,4-butane sultone, 1,3,2-dioxathiolane-2,2-dioxide, 4-propyl-1,3,2-dioxathiolane-2,2-dioxide, methylenemethane disulfonate, dimethylenemethane disulfonate, trimethylenemethane disulfonate, methyl methanesulfonate, methanesulfonyl fluoride, ethenesulfonyl fluoride, 1,2-ethanedisulfonic anhydride, methanesulfonic anhydride, N,sulfonic acid ester compounds such as N'-carbonylbis(N-methylsulfamoyl fluoride), boric acid ester compounds such as difluoro(picolinato)borate, phosphoric acid ester compounds such as phenyl difluorophosphate, tripropargyl phosphate, and tetrafluoro(picolinato)phosphate, phosphazene compounds such as (ethoxy)pentafluorocyclotriphosphazene, nitrile compounds such as succinonitrile, silane compounds such as methyldifluorovinylsilane, methylfluorodivinylsilane, dimethyldivinylsilane, trivinylmethylsilane, trivinylfluorosilane, tetravinylsilane, tris(trimethylsilyl)borate, and tris(trimethylsilyl)phosphate, 1,3-dimethyl-1,3-divinyl-1,3-di(1,1,1,3,3,siloxane compounds such as (3-hexafluoroisopropyl)disiloxane; sulfonates such as fluorosulfonates, trifluoromethanesulfonates, pentafluoroethanesulfonates, and nonafluorobutanesulfonates (of which fluorosulfonates and trifluoromethanesulfonates are particularly preferred); monoalkyl sulfates such as monomethyl sulfate and monoethyl sulfate; bis(trifluoromethanesulfonyl)imide salts, bis(pentafluoroethanesulfonyl)imide salts, (trifluoromethanesulfonyl)(nonafluorobutanesulfonyl)imide salts, (trifluoromethanesulfonyl)(pentafluoroethanesulfonyl)imide salts, (trifluoromethanesulfonyl)(fluorosulfonyl)imide salts, (pentafluoroethanesulfonyl)(fluorosulfonyl)imide salts, (difluorophosphoryl)(fluorosulfonyl)imide salts, (difluorophosphoryl)(trifluoromethanesulfonyl)imide salts, and bis(difluorophosphoryl)imide Salts (among which preferred are imide salts such as bis(trifluoromethanesulfonyl)imide salt, (trifluoromethanesulfonyl)(fluorosulfonyl)imide salt, (difluorophosphoryl)(fluorosulfonyl)imide salt, (difluorophosphoryl)(trifluoromethanesulfonyl)imide salt, and bis(difluorophosphoryl)imide salt), phosphates such as monofluorophosphate, difluorophosphate, tetrafluoro(malonato)phosphate, tris(oxalato)phosphate, difluorobis(oxalato)phosphate, and tetrafluorooxalatophosphate, borates such as bis(oxalato)borate, difluorooxalatoborate, and difluoro(malonato)borate, methide salts such as tris(trifluoromethanesulfonyl)methide salt and tris(fluorosulfonyl)methide salt, carboxylates such as acrylates and methacrylates, inorganic salts such as nitrates and nitrites, and fluorine-containing alcohols such as hexafluoroisopropanol and trifluoroethanol.

[0060] The nonaqueous electrolyte solution of the present disclosure may further contain the following compounds in order to improve the cycle capacity retention rate and gas generation during cycle testing.

[0061]

[0062] By adding the above-mentioned other components to the nonaqueous electrolyte solution of the present disclosure, at least one of the overcharge prevention effect, the negative electrode film formation effect, and the positive electrode protection effect may be enhanced.

[0063] In addition, the electrolyte for a non-aqueous electrolyte battery may be quasi-solidified with a gelling agent or a crosslinked polymer, as in the case of a non-aqueous electrolyte battery known as a lithium polymer battery. Examples of the polymer include a polymer having polyethylene oxide in the main chain or side chain, a homopolymer or copolymer of polyvinylidene fluoride, a methacrylic acid ester polymer, and polyacrylonitrile.

[0064] When the non-aqueous electrolyte solution of the present disclosure contains other components, the content of the other components may be 0.01% by mass or more and 10% by mass or less relative to the total amount of the non-aqueous electrolyte solution. Among the other components, the content of fluoroethylene carbonate may be 0.01% by mass or more and 55% by mass or less relative to the total amount of the non-aqueous electrolyte solution.

[0065] Furthermore, the content of bis(trifluoromethanesulfonyl)imide salt, trifluoromethanesulfonate salt, and nonafluorobutanesulfonate salt relative to the total amount of the nonaqueous electrolyte may be 0.01 mass % or more and 20 mass % or less.

[0066] Furthermore, the content of bis(1,1,1,3,3,3-hexafluoro-1-propyl) carbonate and bis(2,2,2-trifluoroethyl) carbonate relative to the total amount of the nonaqueous electrolyte may be 0.1 mass % or more and 70 mass % or less.

[0067] Furthermore, when the other component is an ionic salt, the cation is more preferably a lithium ion when used in a lithium ion battery, and more preferably a sodium ion when used in a sodium ion battery.

[0068] The nonaqueous electrolyte solution of the present disclosure may contain a total of four or more alkali metal salts by using multiple types of salt compounds of the solutes (lithium salts, sodium salts, etc.) and other components, depending on the required properties, or may contain a total of five or more alkali metal salts.

[0069] The nonaqueous electrolyte of the present disclosure is suitable for use in nonaqueous electrolyte batteries (preferably nonaqueous electrolyte secondary batteries).

[0070] 2. Regarding the Non-Aqueous Electrolyte Battery The non-aqueous electrolyte battery of the present disclosure includes at least the non-aqueous electrolyte of the present disclosure, a negative electrode, and a positive electrode. It may further include a separator, an exterior body, etc. Alternatively, a solid electrolyte may be used as a medium for impregnating the non-aqueous electrolyte instead of the separator. The non-aqueous electrolyte battery of the present disclosure preferably includes at least a positive electrode, a negative electrode, a separator, and the non-aqueous electrolyte of the present disclosure. The non-aqueous electrolyte battery of the present disclosure is preferably a non-aqueous electrolyte secondary battery.

[0071] [Negative Electrode] The negative electrode is not particularly limited, but may contain at least one of an alkali metal, an alkali metal alloy, and a material that intercalates an alkali metal. As the negative electrode, a material that can reversibly insert and extract alkali metal ions such as lithium ions and sodium ions, or alkaline earth metal ions, may be used.

[0072] [Negative electrode active material] For example, in the case of a lithium ion battery in which the cation is mainly lithium, the negative electrode active material constituting the negative electrode is capable of doping and dedoping lithium ions, such as carbon materials having a d value of 0.340 nm or less in the lattice plane (002) plane in X-ray diffraction such as artificial graphite or natural graphite, carbon materials having a d value of more than 0.340 nm in the lattice plane (002) plane in X-ray diffraction such as hard carbon, lithium metal, alloys of lithium metal and other metals (e.g., alloys of lithium metal and one or more metals selected from Si, Sn, Al, alloys of lithium metal and alloys containing one or more metals selected from Si, Sn, Al, etc.), intermetallic compounds of lithium metal and other metals, metal oxides (e.g., oxides of one or more metals selected from Si, Sn, Al, lithium titanium oxide, etc.), metal nitrides, tin (simple substance), tin compounds, activated carbon, conductive polymers, etc. containing at least one selected from. In addition, as the negative electrode active material, Si and / or Si metal oxide and a carbon material can be preferably mentioned. The Si is silicon metal. The Si metal oxide may be a compound represented by SiOx (where x is a value between 0.5 and 1.5). The total content of Si and / or Si metal oxide contained in the negative electrode active material may be 0.1 to 50% by mass, preferably 0.1 to 30% by mass, based on 100% by mass of the total amount of the Si and / or Si metal oxide and the carbon material contained in the negative electrode active material. Graphite is preferred as the carbon material, and various types of artificial graphite, natural graphite, and hard carbon (non-graphitizable carbon) can be used. Graphite exhibits minimal change in its crystalline structure due to the absorption and desorption of lithium, resulting in high energy density and excellent cycle characteristics. The shape of the graphite may be fibrous, spherical, granular, or flake-like. Amorphous carbon and graphite coated with amorphous carbon are more preferred because they reduce the reactivity of the material surface with the electrolyte. These negative electrode active materials can be used alone or in combination of two or more.

[0073] For example, in the case of a sodium-ion battery in which the cation is primarily sodium, the negative electrode active material constituting the negative electrode may be sodium metal, an alloy of sodium metal with other metals such as tin, an intermetallic compound of sodium metal with other metals, various carbon materials such as hard carbon, metal oxides such as titanium oxide, metal nitrides, tin (element), tin compounds, activated carbon, conductive polymers, etc. In addition to these, phosphorus (element) such as red phosphorus or black phosphorus, phosphorus compounds such as Co—P, Cu—P, Sn—P, Ge—P, or Mo—P, antimony (element), or antimony compounds such as Sb / C or Bi—Sb, etc. may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0074] [Negative Electrode Current Collector] The negative electrode has a negative electrode current collector. For example, copper, stainless steel, nickel, titanium, or alloys thereof can be used as the negative electrode current collector. For sodium ion batteries, aluminum or its alloys can also be used.

[0075] [Negative Electrode Active Material Layer] The negative electrode has, for example, a negative electrode active material layer formed on at least one surface of a negative electrode current collector. The negative electrode active material layer is composed of, for example, the above-mentioned negative electrode active material, a binder, and, if necessary, a conductive agent. Examples of the binder include polytetrafluoroethylene, polyvinylidene fluoride, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, styrene butadiene rubber (hereinafter also referred to as "SBR"), carboxymethyl cellulose, methyl cellulose, cellulose acetate phthalate, hydroxypropyl methyl cellulose, polyvinyl alcohol, and polyimide. Examples of the conductive agent that can be used include carbon materials such as acetylene black, ketjen black, furnace black, carbon fiber, graphite, and fluorinated graphite.

[0076] [Positive Electrode] The positive electrode is not particularly limited, but may be made of a material that allows reversible insertion and desorption of alkali metal ions such as lithium ions and sodium ions, or alkaline earth metal ions.

[0077] [Positive Electrode Active Material] For example, when the cation is lithium, the positive electrode material (positive electrode active material) is LiCoO ２ , LiNiO ２ , LiMnO ２ , LiMn ２ O ４ Lithium-containing transition metal composite oxides such as Li[Ni], Li[Ni], Co[Ni], Mn[Ni], Ni[Ni], Co[Ni], Mn[Ni], Ni[Ni], Co[Ni], Mn[Ni], Ni[Ni], Co[Ni], Mn[Ni], Ni[Ni], Mn[Ni], Co[Ni], Mn[Ni], Ni[Ni], Mn[Ni], Co[Ni], Mn[Ni], Mn[Ni], Ni[Ni], Mn ... １／３ Mn １／３ Co １／３ ]O ２ , Li[Ni ０．４５ Mn ０．３５ Co ０．２ ]O ２ , Li[Ni ０．５ Mn ０．３ Co ０．２ ]O ２ , Li[Ni ０．６ Mn ０．２ Co ０．２ ]O ２ , Li[Ni ０．８ Mn ０．１ Co ０．１ ]O ２ (hereinafter, sometimes referred to as "NCM811"), Li[Ni ０．４９ Mn ０．３ Co ０．２ Zr ０．０１ ]O ２ , Li[Ni ０．４９ Mn ０．３ Co ０．２ Mg ０．０１ ]O ２ , LiNi ０．８ Co ０．２ O ２ , LiNi ０．８５ Co ０．１０ Al ０．０５ O ２ , LiNi ０．８７ Co ０．１０ Al ０．０３ O ２ , LiNi ０．９０ Co ０．０７ Al ０．０３ O ２ , LiNi ０．６Co ０．３ Al ０．１ O ２、 LiNi ０．５ Mn １．５ O ４、 LiNi ０．５ Mn ０．５ O ２、 LiNi ０．１ Mn １．９ O ４、 LiCo ０．５ Mn ０．５ O ２ , 0.5 [LiNi ０．５ Mn ０．５ O ２ ] 0.5 [Li ２ MnO ３ ], 0.5[LiNi １／３ Co １／３ Mn １／３ O ２ ] 0.5 [Li ２ MnO ３ ], 0.5[LiNi ０．３７５ Co ０．２５ Mn ０．３７５ O ２ ] 0.5 [Li ２ MnO ３ ], 0.5[LiNi ０．３７５ Co ０．１２５ Fe ０．１２５ Mn ０．３７５ O ２ ] 0.5 [Li ２ MnO ３ ], 0.45[LiNi ０．３７５ Co ０．２５ Mn ０．３７５ O ２ ] 0.10 [Li ２ TiO ３ ] 0.45 [Li ２ MnO ３ In addition, LiFePO , which is called olivine, ４ , LiCoPO ４ , LiMnPO ４ , LiNiPO ４ transition metal phosphate compounds such as TiO ２ , V ２ O ５ , MoO ３ oxides such as TiS ２ , FeS, MoS２ Alternatively, sulfides such as polyacetylene, polyparaphenylene, polyaniline, and polypyrrole, conductive polymers such as activated carbon, radical-generating polymers, and carbon materials may be used.

[0078] For example, when the cation is sodium, the positive electrode material (positive electrode active material) is NaCrO ２ , NaFe ０．５ Co ０．５ O ２ , NaFe ０．４ Mn ０．３ Ni ０．３ O ２ , NaNi ０．５ Ti ０．３ Mn ０．２ O ２ , NaNi １／３ Ti １／３ Mn １／３ O ２ , NaNi ０．３３ Ti ０．３３ Mn ０．１６ Mg ０．１７ O ２ , Na ２／３ Ni １／３ Ti １／６ Mn １／２ O ２ , Na ２／３ Ni １／３ Mn ２／３ O ２ sodium-containing transition metal composite oxides such as those described above, in which a plurality of transition metals such as Co, Mn, and Ni are mixed, sodium-containing transition metal composite oxides in which a part of the transition metal is replaced with a metal other than the transition metal, NaFePO ４ , NaVPO ４ F, Na ３ V ２ (P.O. ４ ) ３ , Na ２ Fe ２ (SO ４ ) ３ Polyanion type compounds such as those of the formula Na α M ００１ β [Fe(CN) ６ ] γThe sodium salt of a Prussian blue analogue represented by ００１ = Cr, Mn, Fe, Co, Ni, Cu or Zn, and 0≦α≦2, 0.5≦β≦1.5, 0.5≦γ≦1.5), TiO ２ , V ２ O ５ , MoO ３ oxides such as TiS ２ , FeS, MoS ２ Alternatively, sulfides such as polyacetylene, polyparaphenylene, polyaniline, and polypyrrole, conductive polymers such as activated carbon, radical-generating polymers, and carbon materials may be used.

[0079] [Positive Electrode Current Collector] The positive electrode has a positive electrode current collector. As the positive electrode current collector, for example, aluminum, stainless steel, nickel, titanium, or an alloy thereof can be used.

[0080] [Positive Electrode Active Material Layer] The positive electrode comprises, for example, a positive electrode active material layer formed on at least one surface of a positive electrode current collector. The positive electrode active material layer is composed of, for example, the above-mentioned positive electrode active material, a binder, and, if necessary, a conductive agent. Examples of the binder include those described in [Negative Electrode Active Material Layer]. Examples of the conductive agent include carbon materials such as acetylene black, ketjen black, furnace black, carbon fiber, graphite (granular graphite or flake graphite), and fluorinated graphite. For the positive electrode, it is preferable to use acetylene black or ketjen black, which have low crystallinity.

[0081] [Method for producing electrodes (positive and negative electrodes)] The electrodes can be obtained, for example, by dispersing and kneading the active material, binder, and optionally conductive agent in predetermined amounts in a solvent such as N-methyl-2-pyrrolidone (NMP) or water, applying the resulting paste to a current collector, and drying to form an active material layer. The resulting electrode is preferably compressed by a method such as a roll press to adjust it to an electrode with an appropriate density.

[0082] [Separator] The nonaqueous electrolyte battery of the present disclosure may include a separator. Examples of separators used to prevent contact between the positive electrode and the negative electrode include nonwoven fabrics or porous sheets made of polyolefins such as polypropylene and polyethylene, cellulose, paper, or glass fiber. These films are preferably microporous so that the electrolyte can penetrate and ions can easily pass through. Examples of polyolefin separators include microporous polymer films such as porous polyolefin films, which electrically insulate the positive electrode and negative electrode and are permeable to lithium ions. Specific examples of porous polyolefin films include porous polyethylene films alone, or multilayer films formed by stacking porous polyethylene films and porous polypropylene films. Other examples include composite films of porous polyethylene and polypropylene films. The nonaqueous electrolyte of the present disclosure may be impregnated into the separator and retained therein. There are no particular limitations on the impregnation method, and any known method may be used. Specifically, the electrolyte can be finally injected into a battery equipped with a positive electrode, a separator, and a negative electrode to impregnate the battery.

[0083] [Exterior Body] As the exterior body of the nonaqueous electrolyte battery of the present disclosure, for example, a coin-shaped, cylindrical, or rectangular metal can, or even a laminate exterior body, etc. Suitable metal can materials include, for example, nickel-plated steel, stainless steel, nickel-plated stainless steel, aluminum or its alloy, nickel, titanium, etc. As the laminate exterior body, for example, an aluminum laminate film, a SUS laminate film, or a laminate film of silica-coated polypropylene, polyethylene, etc., can be used.

[0084] The configuration of the nonaqueous electrolyte battery according to this embodiment is not particularly limited, but may be configured, for example, such that an electrode element in which a positive electrode and a negative electrode are arranged opposite each other, and a nonaqueous electrolyte are enclosed in an exterior body. The shape of the nonaqueous electrolyte battery is not particularly limited, but an electrochemical device in the shape of a coin, cylinder, square, aluminum laminate sheet, or the like can be assembled from the above components.

[0085] 3. Method for Manufacturing a Non-Aqueous Electrolyte Battery The method for manufacturing a non-aqueous electrolyte battery according to the present disclosure includes a step of injecting the non-aqueous electrolyte according to the present disclosure. The method for injecting the electrolyte is not particularly limited, and can be a conventional method. For example, vacuum injection can be used.

[0086] The present disclosure will be specifically described below using examples, but the present disclosure is not limited to such examples.

[0087] Synthesis Example 1-1: Synthesis of Compound (1-1-Li)

[0088]

[0089] 30 g of acetonitrile (hereinafter also referred to as "MeCN") and 0.45 g (6.5 mmol) of lithium nitrate were added to a 50 ml recovery flask, and after stirring at 20 to 30°C, 0.98 g (7.8 mmol) of fluorosulfonyl isocyanate was slowly added. After stirring at 30°C or below for 1 hour, the mixture was concentrated to obtain 0.69 g of compound (1-1-Li) (recovery rate: 70%).

[0090] Synthesis Example 1-2: Synthesis of compound (1-5-Li)

[0091]

[0092] 30 g of MeCN and 0.30 g (4.4 mmol) of lithium nitrate were added to a 50 ml recovery flask and stirred at 20 to 30°C, after which 0.66 g (4.8 mmol) of methoxysulfonyl isocyanate was slowly added. After stirring at 30°C or lower for 1 hour, the mixture was concentrated to obtain 0.51 g of compound (1-5-Li) (recovery rate: 72%).

[0093] Synthesis Example 1-3: Synthesis of Compound (1-11-Li)

[0094]

[0095] 30 g of MeCN and 0.25 g (3.6 mmol) of lithium nitrate were added to a 50 ml recovery flask and stirred at 20 to 30°C, after which 0.67 g (3.8 mmol) of pyrrolidine-1-sulfonyl isocyanate was slowly added. After stirring at 30°C or lower for 1 hour, the mixture was concentrated to obtain 0.53 g of compound (1-11-Li) (recovery rate: 73%).

[0096] Synthesis Example 2-1 Synthesis of Compound (2-1-Li)

[0097]

[0098] 30 g of MeCN and 0.35 g (5.1 mmol) of lithium nitrate were added to a 50 ml recovery flask and stirred at 20 to 30°C, after which 0.84 g (6.6 mmol) of difluorophosphoryl isocyanate was slowly added. After stirring at 30°C or lower for 1 hour, the mixture was concentrated to obtain 0.51 g of compound (2-1-Li) (recovery rate: 66%).

[0099] Synthesis Example 2-2: Synthesis of compound (2-6-Li)

[0100]

[0101] A 50 ml recovery flask was charged with 30 g of tetrahydrofuran and 0.25 g (1.6 mmol) of compound (2-1-Li). After stirring at 20 to 30°C, 0.13 g (1.6 mmol) of 2-mercaptoethanol was slowly added at -10°C or below. After stirring for 10 hours, 0.12 g (3.3 mmol) of lithium hydride was slowly added. The lower layer was removed by decantation, and pressure filtration was performed. To the resulting solid, 30 g of ethyl acetate was added, and centrifugal sedimentation was performed at 2000 rpm for 1 hour. The supernatant was pressure filtered, and the filtrate was concentrated to dryness, yielding 0.13 g of compound (2-6-Li) (recovery rate 62%).

[0102] Furthermore, the above compounds were subjected to a cation exchange reaction to obtain the following compounds (1-1-Na), (1-5-Na), (1-11-Na), (2-1-Na), and (2-6-Na).

[0103]

[0104] [Preparation of Non-Aqueous Electrolyte] (Preparation of Non-Aqueous Electrolyte 1-1) A mixed solvent of EC, DMC, and EMC in a volume ratio of 3:3:4 was used as a non-aqueous organic solvent, and LiPF 6 was added as a solute to the solvent. ６ The compound represented by the formula (1-1-Li) was dissolved as (III) in a concentration of 0.05% by mass relative to the total amount of the nonaqueous electrolyte solution to give a concentration of 1.0 mol / L, to give a nonaqueous electrolyte solution 1-1. The above preparation was carried out while maintaining the liquid temperature at 25°C.

[0105] Examples 1-2 to 1-10 (Preparation of Non-Aqueous Electrolytes 1-2 to 1-10) Non-aqueous electrolytes 1-2 to 1-10 were prepared by dissolving in the same manner as in the preparation of non-aqueous electrolyte 1-1, except that the type and concentration of (III) were changed as shown in Table 1.

[0106] Comparative Example 1-1 (Preparation of Comparative Non-Aqueous Electrolyte Solution 1-1) Comparative non-aqueous electrolyte solution 1-1 was prepared by dissolving in the same manner as in the preparation of non-aqueous electrolyte solution 1-1, except that (III) was not added.

[0107] Comparative Examples 1-2 to 1-4 (Preparation of Comparative Non-Aqueous Electrolytes 1-2 to 1-4) Comparative non-aqueous electrolytes 1-2 to 1-4 were prepared by dissolving in the same manner as in the preparation of non-aqueous electrolyte 1-1, except that lithium dinitramide (hereinafter also referred to as "DN") was used as a comparative compound instead of (III) and its concentration was changed as shown in Table 1. Note that DN was obtained as follows with reference to Patent Document 1 and used.

[0108] Synthesis of DN: 5.5 ml of fuming nitric acid and 2 ml of fuming sulfuric acid were added to a 50 ml recovery flask, and 2.0 g of lithium sulfamate was slowly added at -40°C. After stirring for 30 minutes at -40°C, 40 ml of ice water was poured in, and the mixture was neutralized to pH 7.0 with an aqueous LiOH solution. The neutralized solution was evaporated to dryness and extracted with 2 ml of acetone. 20 ml of 2-propanol was added to the acetone solution, and the mixture was dried under reduced pressure to obtain DN-Na. DN-Na was also obtained by a cation exchange reaction of the above compound.

[0109]

[0110] Examples 2-1 to 2-5, Comparative Examples 2-1 to 2-2 (Preparation of non-aqueous electrolyte solutions 2-1 to 2-5 and comparative non-aqueous electrolyte solutions 2-1 to 2-2) Furthermore, as other additives (1), VC, as other additives (2), bis(oxalato)lithium borate (hereinafter also referred to as "BOB") was added to the concentrations shown in Table 2, except that it was dissolved. Non-aqueous electrolyte solutions 1-4, 1-6 to 1-9, comparative non-aqueous electrolyte solutions 1-1, 1-3 were prepared in the same manner as in the preparation of non-aqueous electrolyte solutions 2-1 to 2-5, and comparative non-aqueous electrolyte solutions 2-1 to 2-2, respectively. Note that other additives (1) and other additives (2) correspond to the other components that may be contained as described above.

[0111] <Examples 3-1 to 3-5, Comparative Examples 3-1 to 3-2> to <Examples 9-1 to 9-5, Comparative Examples 9-1 to 9-2> As shown in Tables 2 to 3, except that the other additive (2) was changed from BOB to the compound shown in each table, non-aqueous electrolytes 2-1 to 2-5 and comparative non-aqueous electrolytes 2-1 to 2-2 were dissolved in the same manner as in the preparation of the non-aqueous electrolytes and comparative non-aqueous electrolytes shown in each table. In addition, "DFBOP" means difluorobis (oxalato) lithium phosphate, "DFOB" means difluorooxalato lithium borate, "TFOP" means tetrafluorooxalato lithium phosphate, "DTD" means 1,3,2-dioxathiolane-2,2-dioxide, "DFPFSI" means (difluorophosphoryl) (fluorosulfonyl) imide lithium, "FS" means lithium fluorosulfonate, and "TV-Si" means tetravinylsilane.

[0112] <Examples 10-1 to 10-5, Comparative Examples 10-1 to 10-2> to <Examples 33-1 to 33-5, Comparative Examples 33-1 to 33-2> As shown in Tables 4 to 9, the compound described in "Additional Solute" in each table was added as a solute in the amount described, and the other additive (2) was changed to the compound described in each table. The nonaqueous electrolytes 2-1 to 2-5 and the comparative nonaqueous electrolytes 2-1 to 2-2 were dissolved in the same manner as in the preparation of the nonaqueous electrolytes and comparative nonaqueous electrolytes described in each table. Note that "DFP" means lithium difluorophosphate, "FSI" means lithium bis(fluorosulfonyl)imide, and "BF ４ " means lithium tetrafluoroborate.

[0113] Examples 34-1 to 34-10, Comparative Examples 34-1 to 34-4 to Examples 59-1 to 59-5, Comparative Examples 59-1 to 59-2 A mixed solution of EC, FEC, DMC, and EMC in a volume ratio of 3:0.2:3:3.8 was obtained as a mixed solution of a nonaqueous organic solvent and other components. LiPF was added as a solute to the mixed solution. ６ and FSI were dissolved to concentrations of 1.0 mol / L and 0.1 mol / L, respectively, and as shown in Tables 10 to 16, the other additive (2) was changed to the compound shown in each table. As a further solute, the compound shown in "additional solute" in each table was added in the amount shown. Except for this, the nonaqueous electrolyte solutions and comparative nonaqueous electrolyte solutions shown in each table were prepared by dissolving in the same manner as in the preparation of the electrolyte solutions shown in Tables 1 to 9.

[0114] Example 60-1 (Preparation of Nonaqueous Electrolyte 60-1) A mixed solution of EC, PC, FEC, and EMC in a volume ratio of 2:1:0.2:6.8 was obtained as a mixed solution of a nonaqueous organic solvent and other components. Sodium hexafluorophosphate (hereinafter "NaPF") was added as a solute to the mixed solution. ６ ") to a concentration of 1.0 mol / L, and the compound represented by the formula (1-1-Na) as (III) was dissolved in a concentration of 0.05 mass% relative to the total amount of the nonaqueous electrolyte to prepare nonaqueous electrolyte 60-1. The above preparation was carried out while maintaining the liquid temperature at 25°C.

[0115] <Examples 60-2 to 60-10> (Preparation of non-aqueous electrolyte solutions 60-2 to 60-10) Non-aqueous electrolyte solutions 60-2 to 60-10 were prepared by dissolving in the same manner as in the preparation of non-aqueous electrolyte solution 60-1, except that the type and concentration of (III) were changed as shown in Table 17.

[0116] Comparative Example 60-1 (Preparation of Comparative Non-Aqueous Electrolyte Solution 60-1) Comparative non-aqueous electrolyte solution 60-1 was prepared by dissolving in the same manner as in the preparation of non-aqueous electrolyte solution 60-1, except that (III) was not added.

[0117] Comparative Examples 60-2 to 60-4 (Preparation of Comparative Non-Aqueous Electrolytes 60-2 to 60-4) Comparative non-aqueous electrolytes 60-2 to 60-4 were prepared by dissolving in the same manner as in the preparation of non-aqueous electrolyte 60-1, except that DN-Na was used as the comparative compound instead of (III) and its concentration was changed as shown in Table 17.

[0118] Examples 61-1 to 61-5, Comparative Examples 61-1 to 61-2 (Preparation of Nonaqueous Electrolytes 61-1 to 61-5, and Comparative Non-Aqueous Electrolytes 61-1 to 61-2) Furthermore, as other additive (1), sodium difluorobis(oxalato)phosphate (hereinafter also referred to as "DFBOP-Na") was added to the concentration shown in Table 18. Except for being dissolved, non-aqueous electrolytes 60-4, 60-6 to 60-9, and comparative non-aqueous electrolytes 60-1 and 60-3 were prepared in the same manner as in the preparation of non-aqueous electrolytes 60-4, 60-6 to 60-9, and comparative non-aqueous electrolytes 60-1 and 60-3, and non-aqueous electrolytes 61-1 to 61-5 and comparative non-aqueous electrolytes 61-1 to 61-2 were obtained, respectively.

[0119] <Examples 62-1 to 62-5, Comparative Examples 62-1 to 62-4> to <Examples 67-1 to 67-5, Comparative Examples 67-1 to 67-2> As shown in Tables 18 to 19, except that the other additive (1) was changed from DFBOP-Na to the compound described in each table, non-aqueous electrolytes 61-1 to 61-5, comparative non-aqueous electrolytes 61-1 to 61-2 were dissolved in the same manner as in the preparation of the non-aqueous electrolytes and comparative non-aqueous electrolytes described in each table. Note that "DFOB-Na" means sodium difluorooxalatoborate, "TFOP-Na" means sodium tetrafluorooxalatophosphate, "DFPFSI-Na" means (difluorophosphoryl) (fluorosulfonyl) imide sodium, and "FS-Na" means sodium fluorosulfonate.

[0120] <Examples 68-1 to 68-5, Comparative Examples 68-1 to 68-2> to <Examples 88-1 to 88-5, Comparative Examples 88-1 to 88-2> As shown in Tables 20 to 25, the compound described in "Additional Solute" in each table was added in the amount described, and the other additives (1) were changed to the compounds described in each table. Except for this, the nonaqueous electrolytes 61-1 to 61-5 and the comparative nonaqueous electrolytes 61-1 to 61-2 were dissolved in the same manner as in the preparation of the nonaqueous electrolytes and comparative nonaqueous electrolytes described in each table. Note that "DFP-Na" means sodium difluorophosphate, "FSI-Na" means sodium bis(fluorosulfonyl)imide, and "BF ４ "-Na" means sodium tetrafluoroborate.

[0121] <Example 89-1> (Preparation of non-aqueous electrolyte solution 89-1) As a non-aqueous organic solvent, 1,3-dioxolane (hereinafter also referred to as "DOL"), dimethoxymethane (hereinafter also referred to as "DME") was used in a volume ratio of 1:2 mixed solvent, and FSI was dissolved in the solvent as a solute to a concentration of 0.8 mol / L, and the compound represented by the above formula (1-1-Li) as (III) was dissolved to a concentration of 1.0 mass% with respect to the total amount of non-aqueous electrolyte solution, to give non-aqueous electrolyte solution 89-1. The above preparation was carried out while maintaining the liquid temperature at 25 ° C.

[0122] <Examples 89-2 to 89-9> (Preparation of non-aqueous electrolyte solutions 89-2 to 89-9) Non-aqueous electrolyte solutions 89-2 to 89-9 were prepared by dissolving in the same manner as in the preparation of non-aqueous electrolyte solution 89-1, except that the type and concentration of (III) were changed as shown in Table 26.

[0123] Comparative Example 89-1 (Preparation of Comparative Non-Aqueous Electrolyte Solution 89-1) Comparative non-aqueous electrolyte solution 89-1 was prepared by dissolving in the same manner as in the preparation of non-aqueous electrolyte solution 89-1, except that (III) was not added.

[0124] Comparative Examples 89-2 to 89-4 (Preparation of Comparative Non-Aqueous Electrolytes 89-2 to 89-4) Comparative non-aqueous electrolytes 89-2 to 89-4 were prepared by dissolving in the same manner as in the preparation of non-aqueous electrolyte 89-1, except that DN was used as the comparative compound instead of (III) and its concentration was changed as shown in Table 26.

[0125] [Preparation of non-aqueous electrolyte battery] (Preparation of NCM622 positive electrode) LiNi ０．６ Co ０．２ Mn ０．２ O ２ 90.0% by mass of the powder was mixed with 5.0% by mass of polyvinylidene fluoride (hereinafter also referred to as "PVDF") as a binder and 5.0% by mass of acetylene black as a conductive material, and N-methyl-2-pyrrolidone (hereinafter also referred to as "NMP") was further added to prepare a positive electrode composite paste. This paste was applied to both sides of aluminum foil (A1085), dried, pressed, and then punched out to a 4 cm x 5 cm piece to obtain a test NCM622 positive electrode.

[0126] (Preparation of NCM811 positive electrode) LiNi ０．８ Mn ０．１ Co ０．１ O ２ A positive electrode composite paste was prepared by mixing 92.0% by mass of the powder with 3.5% by mass of PVDF as a binder and 4.5% by mass of acetylene black as a conductive material, followed by addition of NMP. This paste was applied to both sides of aluminum foil (A1085), dried, pressed, and then punched out to a 4 cm x 5 cm piece to obtain a test NCM811 positive electrode.

[0127] (Sodium ion battery positive electrode: NaNi０．５ Ti ０．３ Mn ０．２ O ２ Preparation of positive electrode) NaNi was used as the positive electrode active material. ０．５ Ti ０．３ Mn ０．２ O ２ 90.0 mass% of the above, 5.0 mass% of acetylene black as a conductive agent, and 5.0 mass% of PVDF as a binder were mixed, and NMP was further added as a solvent to prepare a positive electrode composite paste. This paste was applied to both sides of aluminum foil (A1085), dried, pressed, and then punched out to 4 cm x 5 cm to prepare a test NaNi ０．５ Ti ０．３ Mn ０．２ O ２ The positive electrode was obtained.

[0128] (Preparation of Sulfur Positive Electrode) A positive electrode composite paste was prepared by mixing 80.0 mass% of a sulfur-CNT composite (sulfur:carbon = 70:30 weight ratio) as a positive electrode active material, 10.0 mass% of a conductive material (HS-100 manufactured by Denka), 6.5 mass% of styrene-butadiene rubber (hereinafter also referred to as "SBR"), 3.5 mass% of sodium carboxymethyl cellulose (hereinafter also referred to as "CMC"), and water. This paste was applied to one side of aluminum foil (A1085), dried, pressed, and then punched into a circular electrode with a diameter of 10 mm to obtain a test sulfur positive electrode.

[0129] (Preparation of Natural Graphite Negative Electrode) 92.0% by mass of natural graphite powder, 3.0% by mass of conductive material (HS-100 manufactured by Denka), 2.0% by mass of carbon nanofiber (VGCF manufactured by Showa Denko), 2.0% by mass of SBR, 1.0% by mass of CMC, and water were mixed to prepare a negative electrode composite paste. This paste was applied to one side of copper foil, dried, pressed, and then punched out to 4.5 cm x 5.5 cm to obtain a test natural graphite negative electrode.

[0130] (Preparation of silicon-containing graphite negative electrode) 85.0% by mass of artificial graphite powder, 7.0% by mass of nanosilicon, 3.0% by mass of conductive material (HS-100 manufactured by Denka), 2.0% by mass of carbon nanofiber (VGCF manufactured by Showa Denko), 2.0% by mass of SBR, 1.0% by mass of CMC, and water were mixed to prepare a negative electrode composite paste. This paste was applied to one side of copper foil, dried, pressed, and then punched out to 4.5 cm x 5.5 cm to obtain a silicon-containing graphite negative electrode for testing.

[0131] (Preparation of Hard Carbon Negative Electrode) 90.0% by mass of hard carbon powder (Carbotron P, manufactured by Kureha Corporation) and 10% by mass of PVDF as a binder were mixed, and NMP was further added as a solvent to prepare a negative electrode composite paste. This paste was applied to one side of aluminum foil (A1085), dried, pressed, and then punched out to 4.5 cm × 5.5 cm to obtain a test hard carbon negative electrode.

[0132] (Preparation of Lithium Metal Negative Electrode) A lithium metal test electrode was obtained by punching out a sheet of lithium metal into a circular electrode having a diameter of 12 mm.

[0133] (Preparation of Nonaqueous Electrolyte Battery) In an argon atmosphere with a dew point of −50° C. or less, a terminal was welded to the above-mentioned NCM622 positive electrode, and then the electrode was sandwiched between two polyethylene separators (5 cm × 6 cm). The outer surface of the separator was then sandwiched between two natural graphite negative electrodes with terminals previously welded, with the negative electrode active material surface facing the positive electrode active material surface. These were then placed in an aluminum laminate bag with an opening on one side. After vacuum-injecting the nonaqueous electrolyte, the opening was heat-sealed to prepare aluminum-laminated nonaqueous electrolyte batteries (lithium ion batteries) according to the examples and comparative examples in Tables 1 to 9. In addition, in the examples and comparative examples in Tables 10 to 16, nonaqueous electrolyte batteries (lithium ion batteries) were similarly prepared using NCM811 as the positive electrode and silicon-containing graphite as the negative electrode. In addition, in the examples and comparative examples in Tables 17 to 25, NaNi was used as the positive electrode. ０．５ Ti ０．３ Mn ０．２ O ２Similarly, nonaqueous electrolyte batteries (sodium ion batteries) were fabricated using hard carbon negative electrodes as the positive and negative electrodes. For the Examples and Comparative Examples in Table 26, a coin-type nonaqueous electrolyte battery (lithium-sulfur battery) was fabricated by using a sulfur positive electrode as the positive electrode and a lithium metal negative electrode as the negative electrode, positioned so that they faced each other in an argon atmosphere with a dew point of −50° C. or lower, interposing a polyethylene separator (15 mm in diameter) between them, and then injecting the electrolyte solution prepared above.

[0134] [Evaluation] <Initial Charge / Discharge Test: Lithium-Ion Battery> First, conditioning was performed using the prepared cell at an ambient temperature of 25° C. under the following conditions. That is, in the initial charge / discharge test, the cell was charged at a constant current and constant voltage of 5 mA at an upper charge voltage of 4.2 V, discharged at a constant current of 10 mA to a discharge cut-off voltage of 2.5 V, and then charged at a constant current and constant voltage of 10 mA at an upper charge voltage of 4.2 V, and discharged at a constant current of 10 mA to a discharge cut-off voltage of 2.5 V. This charge / discharge cycle was repeated three times. The discharge capacity in the third cycle was taken as the initial discharge capacity.

[0135] <Initial Charge / Discharge Test: Sodium-Ion Battery> First, the fabricated cell was conditioned at an ambient temperature of 25° C. under the following conditions. That is, in the initial charge / discharge test, the cell was charged at a constant current and constant voltage of 5 mA at an upper charge voltage of 4.1 V, discharged at a constant current of 10 mA to a discharge cut-off voltage of 1.5 V, and then charged at a constant current and constant voltage of 10 mA at an upper charge voltage of 4.1 V, and discharged at a constant current of 10 mA to a discharge cut-off voltage of 1.5 V. This charge / discharge cycle was repeated three times. The discharge capacity in the third cycle was taken as the initial discharge capacity.

[0136] <Initial Charge / Discharge Test: Lithium-Sulfur Battery> First, the fabricated cell was conditioned at an ambient temperature of 25° C. under the following conditions. That is, in the initial charge / discharge test, a constant current discharge was performed at 0.24 mA to a discharge cut-off voltage of 1.8 V. Thereafter, a constant current / constant voltage charge was performed at 0.24 mA to a charge upper limit voltage of 2.5 V, and a constant current discharge was repeated twice at 0.24 mA to a discharge cut-off voltage of 1.8 V. The discharge capacity of the second charge was taken as the initial discharge capacity.

[0137] <Cycle Test (25°C): Lithium-ion Battery> The nonaqueous electrolyte battery after the initial charge / discharge test was subjected to constant-current / constant-voltage charging at 100 mA with an upper limit charge voltage of 4.2 V, and constant-current discharging at 100 mA to a discharge cut-off voltage of 2.5 V. This charge / discharge cycle at 100 mA in a 25°C environment was repeated 500 cycles. Thereafter, the battery was subjected to constant-current / constant-voltage charging at 10 mA with an upper limit charge voltage of 4.2 V, and constant-current discharging at 10 mA to a discharge cut-off voltage of 2.5 V, and the discharge capacity was recorded as the discharge capacity after the cycle test.

[0138] <Cycle Test (25° C.): Sodium Ion Battery> The sodium ion battery was evaluated in the same manner as the lithium ion battery, except that the upper limit charge voltage was changed to 4.1 V and the end-of-discharge voltage was changed to 1.5 V.

[0139] <Cycle Test (25°C): Lithium-Sulfur Battery> The nonaqueous electrolyte battery after the initial charge / discharge test was subjected to constant-current / constant-voltage charging at 1.2 mA and an upper limit charging voltage of 2.5 V, and constant-current discharging at 1.2 mA to a discharge cut-off voltage of 1.8 V. This charge / discharge cycle at 1.2 mA in a 25°C environment was repeated 50 cycles. Thereafter, the battery was subjected to constant-current / constant-voltage charging at 0.24 mA and an upper limit charging voltage of 2.5 V, and constant-current discharging at 0.24 mA to a discharge cut-off voltage of 1.8 V, and the discharge capacity was recorded as the discharge capacity after the cycle test.

[0140] <Capacity retention rate after cycle test: lithium ion battery> The capacity retention rate after cycle test was calculated using the following formula. A larger value indicates better cycle characteristics. Capacity retention rate after cycle test (%) = (discharge capacity after cycle test / initial discharge capacity) x 100

[0141] <Capacity retention rate after cycle test: sodium ion battery> Evaluated in the same manner as for lithium ion batteries. A larger value indicates better cycle characteristics.

[0142] <Capacity retention rate after cycle test: lithium-sulfur battery> Evaluated in the same manner as for lithium-ion batteries. A larger value indicates better cycle characteristics.

[0143] <High-Temperature Storage Test (70°C): Lithium-Ion Battery> The nonaqueous electrolyte battery that had undergone the initial charge / discharge test was charged at a constant current and constant voltage of 10 mA at a charging upper limit voltage of 4.2 V, and then left at 70°C for 60 days. The battery was then left to stand for 4 hours at 25°C, and then discharged at a constant current of 10 mA to a discharge cut-off voltage of 2.5 V. The battery was further charged at a constant current and constant voltage of 10 mA at a charging upper limit voltage of 4.2 V, and then discharged at a constant current of 10 mA to a discharge cut-off voltage of 2.5 V, and the discharge capacity was recorded as the discharge capacity after the high-temperature storage test.

[0144] <High-Temperature Storage Test (70° C.): Sodium-Ion Battery> Except for changing the upper limit charge voltage to 4.1 V and the end-of-discharge voltage to 1.5 V, the battery was evaluated in the same manner as the lithium-ion battery.

[0145] <High-Temperature Storage Test (45°C): Lithium-Sulfur Battery> The nonaqueous electrolyte battery that had undergone the above initial charge / discharge test was charged at a constant current and constant voltage of 0.24 mA at a charging upper limit voltage of 2.5 V, and left for 24 hours in an environment at 45°C. Thereafter, the battery was left standing in an environment at 25°C for 2 hours, and then discharged at a constant current of 0.24 mA to a discharge cut-off voltage of 1.8 V. The battery was further charged at a constant current and constant voltage of 2.5 V and 0.24 mA, and then discharged at a constant current of 0.24 mA to a discharge cut-off voltage of 1.8 V, and the discharge capacity was recorded as the discharge capacity after the high-temperature storage test.

[0146] <Capacity Retention Rate After High-Temperature Storage Test: Lithium-Ion Battery> The capacity retention rate after the high-temperature storage test was calculated using the following formula. A larger value indicates better high-temperature storage characteristics. Capacity retention rate after high-temperature storage test (%) = (discharge capacity after high-temperature storage test / initial discharge capacity) x 100

[0147] <Capacity retention rate after high-temperature storage test: sodium ion battery> Evaluated in the same manner as for lithium ion batteries. A larger value indicates better high-temperature storage characteristics.

[0148] <Capacity retention rate after high-temperature storage test: lithium-sulfur battery> Evaluated in the same manner as for lithium-ion batteries. A larger value indicates better high-temperature storage characteristics.

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[0175] The above results demonstrate that the nonaqueous electrolyte batteries containing the nonaqueous electrolytes of the Examples have superior high-temperature storage characteristics compared to the nonaqueous electrolyte batteries containing the nonaqueous electrolytes of the Comparative Examples. Furthermore, when comparing the Examples and Comparative Examples, which have the same content of (III) and the same content of the comparative compound in the nonaqueous electrolyte, the Examples have superior cycle characteristics.

[0176] According to the present disclosure, it is possible to provide a nonaqueous electrolyte that can exhibit excellent high-temperature storage characteristics when used in a nonaqueous electrolyte battery, a method for manufacturing the nonaqueous electrolyte battery, and a nonaqueous electrolyte battery having excellent high-temperature storage characteristics.

[0177] Although the present disclosure has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present disclosure. This application is based on a Japanese patent application (Patent Application No. 2024-003378) filed on January 12, 2024, the contents of which are incorporated herein by reference.

Claims

1. A non-aqueous electrolyte containing (I) a solute, (II) a non-aqueous organic solvent, and (III) at least one compound selected from the group consisting of a compound represented by the following general formula (1) and a compound represented by the following general formula (2). [In general formula (1), A １ represents -N(H)- or -N － (M １ ＋ ). M １ ＋ represents a metal cation or an onium cation. R １ represents a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyloxy group having 2 to 10 carbon atoms, an aryloxy group having 6 to 15 carbon atoms, an OH group, O － Mx ＋ or N(Rx) ２ . Mx ＋ represents a metal cation or an onium cation. Rx each independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or a fluorosulfonyl group. A plurality of Rx may be the same or different. A plurality of Rx may be bonded to each other. ] [In general formula (2), A ２ represents -N(H)- or -N － (M ２ ＋ ). M ２ ＋ represents a metal cation or an onium cation. R ２ and R ３ each independently represent a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyloxy group having 2 to 10 carbon atoms, an aryloxy group having 6 to 15 carbon atoms, an OH group, O － My ＋ or N(Ry) ２ . My ＋ represents a metal cation or an onium cation. Each Ry independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or a fluorosulfonyl group. A plurality of Rys may be the same or different. A plurality of Rys may be bonded to each other.] 2. R in the general formula (1) １ is a fluorine atom, a methyl group, an ethyl group, an ethenyl group, a methoxy group, O － Mx ＋ , or N(Rx) ２ The non-aqueous electrolyte according to claim 1.

3. R in the general formula (2) ２ and R ３ at least one of which is a fluorine atom, a methyl group, an ethyl group, an ethenyl group, a methoxy group, O － My ＋ , or N(Ry) ２ The non-aqueous electrolyte according to claim 1.

4. A in the general formula (1) １ is -N(H)- or -N － (M １ ＋ )-, and M １ ＋ is a lithium ion or a sodium ion, The non-aqueous electrolyte according to claim 1.

5. A in the general formula (2) ２ is -N(H)- or -N － (M ２ ＋ )-, and M ２ ＋ is a lithium ion or a sodium ion, the non-aqueous electrolyte according to claim 1.

6. The non-aqueous electrolyte according to claim 1, wherein the concentration of the component (III) is 0.01 to 10% by mass based on the total amount of the non-aqueous electrolyte.

7. The (I) is at least one selected from the group consisting of LiPF ６ , LiBF ４ , LiSbF ６ , LiAsF ６ , LiClO ４ , LiN(SO ２ F) ２ , LiAlO ２ , LiAlCl ４ , LiCl, and LiI, and the non-aqueous electrolyte according to claim 1.

8. Wherein (I) is NaPF ６ , NaBF ４ , NaSbF ６ , NaAsF ６ , NaClO ４ , NaN(SO ２ F) ２ , NaAlO ２ , NaAlCl ４ , NaCl, and at least one selected from the group consisting of NaI, the non-aqueous electrolyte according to claim 1.

9. The non-aqueous electrolyte according to claim 1, wherein the component (II) contains at least one selected from the group consisting of a cyclic ester, a chain ester, a cyclic ether, a chain ether, a sulfone compound, a sulfoxide compound, and an ionic liquid.

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

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

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

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

14. The non-aqueous electrolyte according to claim 9, wherein the cyclic ether contains at least one selected from the group consisting of tetrahydrofuran, 2-methyltetrahydrofuran, furan, tetrahydropyran, 1,3-dioxane, 1,4-dioxane, 1,3-dioxolane, and trioxane.

15. The non-aqueous electrolyte according to claim 9, wherein the chain ether contains at least one selected from the group consisting of diethyl ether, dipropyl ether, diisopropyl ether, dibutyl ether, dimethoxymethane, trimethoxymethane, 1,2-dimethoxyethane, diethoxyethane, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether.

16. Further, cyclohexylbenzene, cyclohexylfluorobenzene, biphenyl, 2-fluorobiphenyl, tert-butylbenzene, tert-amylbenzene, 2-fluorotoluene, fluorobenzene, difluoroanisole, vinylene carbonate, an oligomer of vinylene carbonate (number average molecular weight in terms of polystyrene is 170 to 5000), vinyl ethylene carbonate, divinyl ethylene carbonate, fluoroethylene carbonate, ethynyl ethylene carbonate, trans-difluoroethylene carbonate, methyl propargyl carbonate, ethyl propargyl carbonate, dipropargyl carbonate, dimethyl vinylene carbonate, dimethyl dicarbonate, bis(1,1,1,3,3,3-hexafluoro-1-propyl) carbonate, bis(2,2,2-trifluoroethyl) carbonate, 1,6-diisocyanatohexane, maleic anhydride, succinic anhydride, 1,4-dioxane-2,6-dione, glutaric anhydride, methanedisulfonic anhydride, 1,3-propanesultone, 1,3-propenesultone, 1,4-butanesultone, 2,4-butanesultone, 1,3,2-dioxathiolane-2,2-dioxide, 4-propyl-1,3,2-dioxathiolane-2,2-dioxide, methylene methanedisulfonate, dimethylene methanedisulfonate, trimethylene methanedisulfonate, methyl methanesulfonate, methanesulfonyl fluoride, ethenesulfonyl fluoride, 1,2-ethanedisulfonic anhydride, methanesulfonic anhydride, N,N'-carbonylbis(N-methylsulfamoyl fluoride), difluoro(picolylato)borate, phenyl difluorophosphate, tripropargyl phosphate, tetrafluoro(picolylato)phosphate, (ethoxy)pentafluorocyclotriphosphazene, succinonitrile, methyl difluorovinylsilane, methylfluorodivinylsilane, dimethyldivinylsilane, trivinylmethylsilane, trivinylfluorosilane, tetravinylsilane, tris(trimethylsilyl)borate, tris(trimethylsilyl)phosphate, 1,3-dimethyl-1,3-divinyl-1,3-di(1,1,1,3,3,The non-aqueous electrolyte according to claim 1, containing at least one selected from the group consisting of 3-hexafluoroisopropyl) disiloxane, fluorosulfonate, trifluoromethanesulfonate, pentafluoroethanesulfonate, nonafluorobutanesulfonate, monomethyl sulfate, monoethyl sulfate, bis(trifluoromethanesulfonyl)imide salt, bis(pentafluoroethanesulfonyl)imide salt, (trifluoromethanesulfonyl)(nonafluorobutanesulfonyl)imide salt, (trifluoromethanesulfonyl)(pentafluoroethanesulfonyl)imide salt, (trifluoromethanesulfonyl)(fluorosulfonyl)imide salt, (pentafluoroethanesulfonyl)(fluorosulfonyl)imide salt, (difluorophosphoryl)(fluorosulfonyl)imide salt, (difluorophosphoryl)(trifluoromethanesulfonyl)imide salt, bis(difluorophosphoryl)imide salt, monofluorophosphate, difluorophosphate, tetrafluoro(malonato)phosphate, tris(oxalato)phosphate, difluorobis(oxalato)phosphate, tetrafluorooxalatophosphate, bis(oxalato)borate, difluorooxalatoborate, difluoro(malonato)borate, tris(trifluoromethanesulfonyl)methide salt, tris(fluorosulfonyl)methide salt, acrylate, methacrylate, nitrate, nitrite, hexafluoroisopropanol, and trifluoroethanol., 17. A non-aqueous electrolyte battery comprising at least a positive electrode, a negative electrode, and the non-aqueous electrolyte according to any one of claims 1 to 16.

18. The non-aqueous electrolyte battery according to claim 17, wherein the negative electrode contains at least one of an alkali metal, an alkali metal alloy, and a material that intercalates an alkali metal.

19. A method for manufacturing a non-aqueous electrolyte battery, comprising a step of injecting the non-aqueous electrolyte according to any one of claims 1 to 16.

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