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

Abstract

Disclosed is a nonaqueous electrolyte solution for a nonaqueous electrolyte battery that comprises at least one of a positive electrode that contains a layered rock salt type positive electrode active material having a density of an active material layer of a specific value or more, a positive electrode that contains an olivine type positive electrode active material, a positive electrode that contains a spinel type positive electrode active material, a negative electrode that contains a graphite negative electrode active material, a negative electrode that contains an Si-containing negative electrode active material and graphite, and a negative electrode that contains a titanium-containing oxide negative electrode active material, the electrodes being set forth in the description. The nonaqueous electrolyte solution contains (I) a solute, (II) a nonaqueous organic solvent, and (III) a compound represented by general formula (1) that is set forth in the description. Also disclosed are: a nonaqueous electrolyte battery which comprises at least one of the above-described electrodes, and the above-described 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 for a nonaqueous electrolyte battery having an electrode in which the density of an active material layer is equal to or greater than a specific value, a nonaqueous electrolyte battery having the electrode and the nonaqueous electrolyte, and a method for manufacturing a nonaqueous electrolyte battery.

[0002] In recent years, in order to increase the capacity of non-aqueous electrolyte batteries, the density of the positive electrode active material layer and the density of the negative electrode active material layer (hereinafter, these may be collectively referred to as the "density of the electrode active material layer") of non-aqueous electrolyte batteries have been increasing.

[0003] Meanwhile, a lithium secondary battery has been disclosed in which a compound in which a halogen group is bonded to at least one selected from the group consisting of phosphite esters, phosphate esters, borate esters, sulfate esters, and sulfite esters is contained in the solvent of the nonaqueous electrolyte, in order to sufficiently suppress the reaction between the nonaqueous electrolyte and the negative electrode during charge and discharge and to obtain a lithium secondary battery with excellent cycle characteristics (Patent Document 1).

[0004] Japanese Patent Application Publication No. 2002-025609

[0005] The density of the electrode active material layer is increased, and in particular, the density of the positive electrode active material layer containing the layered rock salt type positive electrode active material is 2.50 g / cm ３ a positive electrode containing an olivine-type positive electrode active material and having a positive electrode active material layer with a density of 1.50 g / cm ３ a positive electrode containing a spinel-type positive electrode active material and having a positive electrode active material layer with a density of 2.00 g / cm ３ a positive electrode containing a graphite negative electrode active material and a negative electrode active material layer having a density of 1.00 g / cm ３ a negative electrode containing a Si-containing negative electrode active material and graphite, and a negative electrode active material layer having a density of 1.00 g / cm ３ and a negative electrode containing a titanium-containing oxide negative electrode active material and having a density of 1.50 g / cm ３ The inventors' investigations have revealed that when a nonaqueous electrolyte battery has an electrode configuration including at least one of the above negative electrodes, the wettability of the nonaqueous electrolyte to the electrode surface decreases.

[0006] Therefore, the present disclosure aims to provide a nonaqueous electrolyte that can improve the wettability of the electrode surface even when the density of the electrode active material layer is equal to or higher than a specific value, a nonaqueous electrolyte battery including at least one of the positive electrode and negative electrode and the nonaqueous electrolyte, and a method for manufacturing the nonaqueous electrolyte battery.

[0007] That is, the present invention is as follows: [1] A cathode active material layer containing a layered rock salt type cathode active material and having a density of 2.50 g / cm ３ a positive electrode containing an olivine-type positive electrode active material and having a positive electrode active material layer with a density of 1.50 g / cm ３ a positive electrode containing a spinel-type positive electrode active material and having a positive electrode active material layer with a density of 2.00 g / cm ３ a positive electrode containing a graphite negative electrode active material and a negative electrode active material layer having a density of 1.00 g / cm ３ a negative electrode containing a Si-containing negative electrode active material and graphite, and a negative electrode active material layer having a density of 1.00 g / cm ３ and a negative electrode containing a titanium-containing oxide negative electrode active material and having a density of 1.50 g / cm ３ A nonaqueous electrolyte solution for a nonaqueous electrolyte battery including at least one of the above negative electrodes, the nonaqueous electrolyte solution comprising: (I) a solute; (II) a nonaqueous organic solvent; and (III) a compound represented by the following general formula (1):

[0008]

[0009] [In general formula (1), each R independently represents an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, or an aryl group.]

[0010] [2] The nonaqueous electrolyte battery contains a layered rock salt type positive electrode active material, and the density of the positive electrode active material layer is 2.50 to 5 g / cm ３ a positive electrode containing an olivine-type positive electrode active material and having a positive electrode active material layer with a density of 1.50 to 3 g / cm ３ a positive electrode containing a spinel-type positive electrode active material and having a positive electrode active material layer having a density of 2.00 to 4 g / cm ３ a positive electrode containing a graphite negative electrode active material and a negative electrode active material layer having a density of 1.00 to 3 g / cm ３ a negative electrode comprising a Si-containing negative electrode active material and graphite, and a negative electrode active material layer having a density of 1.00 to 3 g / cm３ and a negative electrode containing a titanium-containing oxide negative electrode active material and having a density of a negative electrode active material layer of 1.50 to 3 g / cm ３ The nonaqueous electrolyte solution according to [1], further comprising at least one negative electrode selected from the group consisting of:

[0011] [3] The nonaqueous electrolyte solution according to [1] or [2], wherein R in the general formula (1) is an alkyl group having a fluorine atom. [4] The nonaqueous electrolyte solution according to any one of [1] to [3], wherein the content of (III) relative to the total amount of the nonaqueous electrolyte solution is 0.015 to 9 mass%.

[0012] [5] The nonaqueous electrolyte solution according to any one of [1] to [4], wherein (III) is at least one selected from the group consisting of tris(1,1,1,3,3,3-hexafluoro-2-propyl) phosphite, tris(2,2,2-trifluoroethyl) phosphite, tris(2,2-difluoroethyl) phosphite, and tris(2-fluoroethyl) phosphite.

[0013] [6] The (I) is LiPF ６ , LiBF ４ , LiSbF ６ , LiAsF ６ , LiClO ４ , LiN(FSO ２ ) ２ , LiAlO ２ , LiAlCl ４ , LiCl, and LiI.

[0014] [7] The compound (I) is NaPF ６ , NaBF ４ , NaSbF ６ , NaAsF ６ , NaClO ４ , NaN(FSO ２ ) ２ , NaAlO ２ , NaAlCl ４ 10. The nonaqueous electrolyte solution according to any one of [1] to [5], wherein the nonaqueous electrolyte solution is at least one selected from the group consisting of NaCl, NaI, and NaI.

[0015] [8] The nonaqueous electrolyte solution according to any one of [1] to [7], 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. [9] The nonaqueous electrolyte solution according to [8], wherein the cyclic ester comprises a cyclic carbonate.

[10] The nonaqueous electrolyte solution according to [9], wherein the cyclic carbonate comprises at least one selected from the group consisting of ethylene carbonate and propylene carbonate.

[11] The nonaqueous electrolyte solution according to any one of [8] to

[10] , wherein the chain ester comprises a chain carbonate.

[12] The nonaqueous electrolyte solution according to

[11] , 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.

[13] The non-aqueous electrolyte solution according to any one of [8] to

[12] , 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.

[14] The non-aqueous electrolyte solution according to any one of [8] to

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

[0016]

[15] Further, cyclohexylbenzene, cyclohexylfluorobenzene, biphenyl, 2-fluorobiphenyl, tert-butylbenzene, tert-amylbenzene, 2-fluorotoluene, fluorobenzene, difluoroanisole, vinylene carbonate, vinylene carbonate oligomers (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, dimethyldicarbonate, bis(1,1,1,3,3,3-hexafluoro-1-propyl)carbonate, bis(2,2,2-trifluoroethyl)carbonate, 1,6-diisocyanatohexa sultone, maleic anhydride, succinic anhydride, 1,4-dioxane-2,6-dione, glutaric anhydride, methanedisulfonic anhydride, 1,2-ethanedisulfonic anhydride, methanesulfonic anhydride, 2-sulfobenzoic anhydride, 1,3-propanedisulfonic anhydride, 1,3-propanesulfonic anhydride, 1,3-propanesulfonic anhydride, 1,3-propenesultone, 1,4-butanesultone, 2,4-butanesultone, 1,3,2-dioxathiolane-2,2-dioxide, 4-propanesulfonic anhydride Pyr-1,3,2-dioxathiolane-2,2-dioxide, 1,3-dithiolane-1,1,3,3-tetraoxide, 1,3-dithiane-1,1,3,3-tetraoxide, 1,2-oxathiolan-5-one-2,2-dioxide, methylenemethane disulfonate, dimethylenemethane disulfonate, trimethylenemethane disulfonate, methyl methanesulfonate, methanesulfonyl fluoride, ethenesulfonyl fluoride, 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)(trifluoromethanesulfonyl)imide salt, bis(difluorophosphoryl)imide salt, (fluorosulfonyl) The non-aqueous electrolyte solution according to any one of [1] to

[14] , containing at least one selected from the group consisting of (fluorosulfonyl)(lithium carbonyloxymethanesulfonate)imide, (fluorosulfonyl)(carbonyldi(2-propenyl)phosphoryl)imide salt, (carbonyldi(propargyl)phosphoryl)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.

[0017]

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

[15] , wherein at least one of the positive electrode and the negative electrode contains a layered rock salt type positive electrode active material, and the density of the positive electrode active material layer is 2.50 g / cm ３ a positive electrode containing an olivine-type positive electrode active material and having a positive electrode active material layer with a density of 1.50 g / cm ３ a positive electrode containing a spinel-type positive electrode active material and having a positive electrode active material layer with a density of 2.00 g / cm ３a positive electrode containing a graphite negative electrode active material and a negative electrode active material layer having a density of 1.00 g / cm ３ a negative electrode containing a Si-containing negative electrode active material and graphite, and a negative electrode active material layer having a density of 1.00 g / cm ３ and a negative electrode containing a titanium-containing oxide negative electrode active material and having a density of 1.50 g / cm ３ A non-aqueous electrolyte battery, wherein at least one of the negative electrodes is selected from the above.

[0018]

[17] A layered rock salt type positive electrode active material having a density of 2.50 g / cm ３ a positive electrode containing an olivine-type positive electrode active material and having a positive electrode active material layer with a density of 1.50 g / cm ３ a positive electrode containing a spinel-type positive electrode active material and having a positive electrode active material layer with a density of 2.00 g / cm ３ a positive electrode containing a graphite negative electrode active material and a negative electrode active material layer having a density of 1.00 g / cm ３ a negative electrode containing a Si-containing negative electrode active material and graphite, and a negative electrode active material layer having a density of 1.00 g / cm ３ and a negative electrode containing a titanium-containing oxide negative electrode active material and having a density of 1.50 g / cm ３ A method for manufacturing a nonaqueous electrolyte battery, comprising the step of impregnating at least one of the above negative electrodes with a nonaqueous electrolyte, wherein the nonaqueous electrolyte contains: (I) a solute; (II) a nonaqueous organic solvent; and (III) a compound represented by the following general formula (1):

[0019]

[0020] [In general formula (1), each R independently represents an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, or an aryl group.]

[0021] According to the present disclosure, it is possible to provide a nonaqueous electrolyte that can improve wettability to the electrode surface even in a nonaqueous electrolyte battery having an electrode with an active material layer density equal to or greater than a specific value, a nonaqueous electrolyte battery including the electrode and the nonaqueous electrolyte, and a method for manufacturing the nonaqueous electrolyte battery.

[0022] 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.

[0023] 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.

[0024] 1. Regarding the non-aqueous electrolyte The non-aqueous electrolyte of the present disclosure contains a layered rock salt type positive electrode active material and has a positive electrode active material layer density of 2.50 g / cm ３ a positive electrode containing an olivine-type positive electrode active material and having a positive electrode active material layer with a density of 1.50 g / cm ３ a positive electrode containing a spinel-type positive electrode active material and having a positive electrode active material layer with a density of 2.00 g / cm ３ a positive electrode containing a graphite negative electrode active material and a negative electrode active material layer having a density of 1.00 g / cm ３ a negative electrode containing a Si-containing negative electrode active material and graphite, and a negative electrode active material layer having a density of 1.00 g / cm ３ and a negative electrode containing a titanium-containing oxide negative electrode active material and having a density of 1.50 g / cm ３ The nonaqueous electrolyte solution for a nonaqueous electrolyte battery having at least one of the above-mentioned negative electrodes (hereinafter, these positive and negative electrodes are also referred to as "specific electrodes") contains: (I) a solute; (II) a nonaqueous organic solvent; and (III) a compound represented by the above general formula (1).

[0025] <Regarding (I) Solute> The solute (I) (also referred to as "(I)") contained in the nonaqueous electrolyte solution of the present disclosure will be described below. The solute (I) can be any of various solutes conventionally used in the field of nonaqueous electrolyte solutions, without any particular limitations. Such a solute is preferably an ionic salt composed of a pair of any 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. For example, such a solute is preferably an ionic salt composed 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 ions, 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(FSO ２ ) ２ , LiAlO ２ , LiAlCl ４ , LiCl, and LiI, or NaPF ６ , NaBF ４ , NaSbF ６ , NaAsF ６ , NaClO ４ , NaN(FSO ２ ) ２ , NaAlO ２ , NaAlCl ４ At least one selected from the group consisting of NaCl and NaI can be preferably mentioned.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] <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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] <Regarding (III) Compound Represented by General Formula (1)> The compound (III) represented by general formula (1) (also referred to as "(III)") contained in the nonaqueous electrolyte solution of the present disclosure will be described.

[0045]

[0046] [In general formula (1), each R independently represents an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, or an aryl group.]

[0047] Examples of the alkyl group represented by R include linear or branched alkyl groups having 1 to 10 carbon atoms, and specific examples thereof include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, an isobutyl group, a tert-butyl group, an n-pentyl group, an isopentyl group, a neopentyl group, an n-hexyl group, and an n-heptyl group.

[0048] The cycloalkyl group represented by R includes cycloalkyl groups having 3 to 10 carbon atoms, and specific examples thereof include a cyclopropyl group, a cyclopentyl group, and a cyclohexyl group.

[0049] The alkenyl group represented by R includes linear or branched alkenyl groups having 2 to 10 carbon atoms, and specific examples thereof include a vinyl group, an allyl group, a 1-propenyl group, an isopropenyl group, a 1-methyl-2-propenyl group, a 2-methyl-2-propenyl group, a 1,1-dimethyl-2-propenyl group, a 1-butenyl group, a 2-butenyl group, a 3-butenyl group, a 3-methyl-2-butenyl group, a 1,3-butadienyl group, and a 1-pentynyl group.

[0050] The alkynyl group represented by R includes linear or branched alkynyl groups having 2 to 10 carbon atoms, and specific examples thereof include an ethynyl group, a 1-propynyl group, a 2-propynyl group, a 1-methyl-2-propynyl group, a 1,1-dimethyl-2-propynyl group, a 2-butynyl group, a 3-butynyl group, and a 4-butynyl group.

[0051] The aryl group represented by R includes aryl groups having 6 to 10 carbon atoms, and specific examples thereof include a phenyl group, a tolyl group, and a xylyl group.

[0052] At least one of the hydrogen atoms of the alkyl group, cycloalkyl group, alkenyl group, alkynyl group, and aryl group may be substituted with a substituent. Examples of the substituent include a halogen atom, a nitrile group, an isocyanate group, a carbonyl group, an ether group, an ester group, an alkyl group, or a group formed by combining two or more of these. Examples of the halogen atom as the substituent include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. Examples of the alkyl group as the substituent include a linear or branched alkyl group having 1 to 10 carbon atoms.

[0053] R preferably has a fluorine atom as a substituent, and more preferably is an alkyl group having a fluorine atom. Specific examples of the alkyl group having a fluorine atom include a 1,1,1,3,3,3-hexafluoro-2-propyl group, a 2,2,2-trifluoroethyl group, a 2,2-difluoroethyl group, and a 2-fluoroethyl group.

[0054] The three R's in the general formula (1) may be the same or different from one another, but from the viewpoint of ease of synthesis, it is preferable that the three R's are the same group.

[0055] Specific examples of the compound represented by formula (1) are shown below, but the invention is not limited to these.

[0056]

[0057] Among these, the compound represented by general formula (1), i.e., (III), is preferably at least one selected from the group consisting of tris(1,1,1,3,3,3-hexafluoro-2propyl) phosphite, tris(2,2,2-trifluoroethyl) phosphite, tris(2,2-difluoroethyl) phosphite, and tris(2-fluoroethyl) phosphite.

[0058] In the nonaqueous electrolyte solution of the present disclosure, the content of the component (III) (hereinafter also referred to as the "concentration of (III)") relative to the total amount (100% by mass) of the nonaqueous electrolyte solution is preferably 0.01% by mass or more, more preferably 0.015% by mass, even more preferably 0.03% by mass or more, particularly preferably 0.1% by mass or more, and most preferably 0.25% by mass or more. The upper limit of the concentration of (III) is preferably 10% by mass or less, more preferably 9% by mass or less, even more preferably 6% by mass or less, particularly preferably 4% by mass or less, and most preferably 2.5% by mass or less. By setting the concentration of (III) to 0.01% by mass or more, the effect of improving the wettability of the nonaqueous electrolyte solution to the electrode surface is easily obtained. On the other hand, by setting the concentration of (III) to 10% by mass or less, the increase in viscosity of the nonaqueous electrolyte solution can be suppressed, and the effect of suppressing the increase in initial resistance of a nonaqueous electrolyte battery using the nonaqueous electrolyte solution is easily obtained. The content of the component (III) relative to the total amount of the non-aqueous electrolyte is preferably 0.01 to 10% by mass, more preferably 0.015 to 9% by mass.

[0059] In the nonaqueous electrolyte solution of the present disclosure, as (III), 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.

[0060] The compound represented by general formula (1) can be purchased as a commercially available product or produced by a known method. Commercially available products include, for example, triethyl phosphite, triphenyl phosphite, tris(2,2,2-trifluoroethyl phosphite), and tris(1,1,1,3,3,3-hexafluoro-2propyl) phosphite, all manufactured by TCI. Non-commercially available products include, for example, tris(4-fluorophenyl) phosphite, which can be obtained by stirring 4-fluorophenol and phosphorus trichloride in an ethyl methyl carbonate solvent in the presence of triethylamine.

[0061] <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.

[0062] Examples of other components include aromatic compounds such as cyclohexylbenzene, cyclohexylfluorobenzene, biphenyl, 2-fluorobiphenyl, tert-butylbenzene, tert-amylbenzene, 2-fluorotoluene, fluorobenzene, and difluoroanisole; Carbonate compounds such as vinylene carbonate (hereinafter sometimes referred to as "VC"), vinylene carbonate oligomers (having a number average molecular weight of 170 to 5000 in terms of polystyrene), vinyl ethylene carbonate, divinyl ethylene carbonate, fluoroethylene carbonate (hereinafter sometimes referred to as "FEC"), 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, and bis(2,2,2-trifluoroethyl)carbonate; isocyanate compounds such as 1,6-diisocyanatohexane; organic acid anhydrides such as maleic anhydride, succinic anhydride, 1,4-dioxane-2,6-dione, glutaric anhydride, methanedisulfonic anhydride, 1,2-ethanedisulfonic anhydride, methanesulfonic anhydride, 2-sulfobenzoic anhydride, and 1,3-propanedisulfonic anhydride; sulfonate compounds and sulfonyl compounds such as 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, 1,3-dithiolane-1,1,3,3-tetraoxide, 1,3-dithiane-1,1,3,3-tetraoxide, 1,2-oxathiolan-5-one-2,2-dioxide, methylenemethane disulfonate, dimethylenemethane disulfonate, trimethylenemethane disulfonate, methyl methanesulfonate, methanesulfonyl fluoride, ethenesulfonyl fluoride, and N,N'-carbonylbis(N-methylsulfamoyl fluoride); borate compounds such as difluoro(picolinato)borate;phosphoric acid ester compounds such as phenyl difluorophosphate, tripropargyl phosphate, tetrafluoro(picolinato)phosphate, etc.; phosphazene compounds such as (ethoxy)pentafluorocyclotriphosphazene, etc.; nitrile compounds such as succinonitrile, etc.; silane compounds such as methyldifluorovinylsilane, methylfluorodivinylsilane, dimethyldivinylsilane, trivinylmethylsilane, trivinylfluorosilane, tetravinylsilane, tris(trimethylsilyl)borate, tris(trimethylsilyl)phosphate, etc.; siloxane compounds such as 1,3-dimethyl-1,3-divinyl-1,3-di(1,1,1,3,3,3-hexafluoroisopropyl)disiloxane, etc.; sulfonates such as fluorosulfonate, trifluoromethanesulfonate, pentafluoroethanesulfonate, nonafluorobutanesulfonate (among which, fluorosulfonate and trifluoromethanesulfonate are preferred), monoalkyl sulfates such as monomethyl sulfate, monoethyl sulfate, etc.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, (fluorosulfonyl)(calcium imide salts such as (trifluoromethanesulfonyl)imide salt, (fluorosulfonyl)(carbonyldi(2-propenyl)phosphoryl)imide salt, (carbonyldi(propargyl)phosphoryl)imide salt (among which, preferably, bis(trifluoromethanesulfonyl)imide salt, (trifluoromethanesulfonyl)(fluorosulfonyl)imide salt, (difluorophosphoryl)(fluorosulfonyl)imide salt, (difluorophosphoryl)(trifluoromethanesulfonyl)imide salt, and bis(difluorophosphoryl)imide salt), or imide compounds in which a hydrogen atom is bonded to the nitrogen atom instead of a cation in the above imide salts, Examples of suitable salts include phosphates such as monofluorophosphates, difluorophosphates, tetrafluoro(malonato)phosphates, tris(oxalato)phosphates, difluorobis(oxalato)phosphates, and tetrafluorooxalatophosphates; borates such as bis(oxalato)borate, difluorooxalatoborate, and difluoro(malonato)borate; methide salts such as tris(trifluoromethanesulfonyl)methide salts and tris(fluorosulfonyl)methide salts; carboxylates such as acrylates and methacrylates; inorganic salts such as nitrates and nitrites; and fluorine-containing alcohols such as hexafluoroisopropanol and trifluoroethanol. The cation in the above salts may be an alkali metal ion, an alkaline earth metal ion, or a quaternary ammonium.

[0063] 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.

[0064]

[0065] The nonaqueous electrolyte solution of the present disclosure may further include 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, dimethyldicarbonate, bis(1,1,1,3,3,3-hexafluoro-1-propyl)carbonate, bis(2,2,2-trifluoroethyl)carbonate, 1,6-diisocyanate ...methylvinylene carbonate, dimethyldicarbonate, bis(1,1,1,3,3,3-hexafluoro-1-propyl)carbonate, bis(2,2,2-trifluoroethyl)carbonate, 1,6-diisocyanate, methylpropargyl carbonate, ethylpropargyl carbonate, dipropyldicarbonate, methylpropargyl carbonate, methylpropargyl carbonate, ethylpropargyl carbonate, dipropyldicarbonate, methylpropargyl carbonate, methylpropargyl carbonate, methylpropargyl carbonate, methylpropargyl carbonate, methylpropargyl carbonate, methylpropargyl carbonate, methylpropargyl carbonate, methylpropargyl carbonate, methylpropargyl carbonate, methylpropargyl carbonate, methylpropargyl carbonate, Hydroxyhexane, maleic anhydride, succinic anhydride, 1,4-dioxane-2,6-dione, glutaric anhydride, methanedisulfonic anhydride, 1,2-ethanedisulfonic anhydride, methanesulfonic anhydride, 2-sulfobenzoic anhydride, 1,3-propanedisulfonic anhydride, 1,3-propanesulfonic anhydride, 1,3-propanesulfonic anhydride, 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, 1,3-dithiolane-1,1,3,3-tetraoxide, 1,3-dithiane-1,1,3,3-tetraoxide, 1,2-oxathiolan-5-one-2,2-dioxide, methylenemethane disulfonate, dimethylenemethane disulfonate, trimethylenemethane disulfonate, methyl methanesulfonate, methanesulfonyl fluoride, ethenesulfonyl fluoride, 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)(trifluoromethanesulfonyl)imide salt, bis(difluorophosphoryl)imide salts, (fluorosulfonyl)(lithium carbonyloxymethanesulfonate)imide, (fluorosulfonyl)(carbonyldi(2-propenyl)phosphoryl)imide salts, (carbonyldi(propargyl)phosphoryl)imide salts, monofluorophosphates, difluorophosphates, tetrafluoro(malonato)phosphates, tris(oxalato)phosphates, difluorobis(oxalato)phosphates, tetrafluorooxalatophosphates, bis(oxalato)borates, difluorooxalatoborates, difluoro(malonato)borates, tris(trifluoromethanesulfonyl)methide salts, tris(fluorosulfonyl)methide salts, acrylates, methacrylates, nitrates, nitrites, hexafluoroisopropanol, and trifluoroethanol.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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 70.0 mass % or less.

[0071] 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.

[0072] 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.

[0073] The nonaqueous electrolyte of the present disclosure is suitably used in a nonaqueous electrolyte battery (preferably a nonaqueous electrolyte secondary battery) that includes at least one of the specific electrodes described above.

[0074] The nonaqueous electrolyte battery contains a layered rock salt type positive electrode active material and the density of the positive electrode active material layer is 2.50 to 5 g / cm ３ a positive electrode containing an olivine-type positive electrode active material and having a positive electrode active material layer with a density of 1.50 to 3 g / cm ３ a positive electrode containing a spinel-type positive electrode active material and having a positive electrode active material layer having a density of 2.00 to 4 g / cm ３ a positive electrode containing a graphite negative electrode active material and a negative electrode active material layer having a density of 1.00 to 3 g / cm ３ a negative electrode comprising a Si-containing negative electrode active material and graphite, and a negative electrode active material layer having a density of 1.00 to 3 g / cm ３ and a negative electrode containing a titanium-containing oxide negative electrode active material and having a density of a negative electrode active material layer of 1.50 to 3 g / cm ３ It is preferable that the negative electrode is provided with at least one of the negative electrodes.

[0075] The specific electrodes will be described in detail in the section on non-aqueous electrolyte batteries below.

[0076] The nonaqueous electrolyte solution of the present disclosure improves the wettability of the specific electrode surface, which reduces the time required to impregnate the specific electrode with the nonaqueous electrolyte solution during the manufacture of a nonaqueous electrolyte battery, i.e., the time required for the standing step for impregnation of the specific electrode with the nonaqueous electrolyte solution after injecting the nonaqueous electrolyte solution into a battery cell, thereby improving the production efficiency of nonaqueous electrolyte batteries.

[0077] <Regarding wettability of electrode surface> The wettability of the nonaqueous electrolyte to the electrode surface can be evaluated as follows. In a −45° C. dew point environment at 25° C., 5 μL of nonaqueous electrolyte is dropped onto an electrode sheet cut to 5 cm × 5 cm using a microsyringe (Hamilton syringe 7105KH), and video is captured from above using a camera. The droplet areas 3 seconds and 15 seconds after droplet arrival are calculated by binarization to evaluate the droplet area increase. A larger droplet area increase indicates that the electrolyte has spread to the electrode surface.

[0078] 2. Regarding the nonaqueous electrolyte battery The nonaqueous electrolyte battery of the present disclosure contains at least the nonaqueous electrolyte of the present disclosure and a layered rock salt type positive electrode active material, and the density of the positive electrode active material layer is 2.50 g / cm ３a positive electrode containing an olivine-type positive electrode active material and having a positive electrode active material layer with a density of 1.50 g / cm ３ a positive electrode containing a spinel-type positive electrode active material and having a positive electrode active material layer with a density of 2.00 g / cm ３ a positive electrode containing a graphite negative electrode active material and a negative electrode active material layer having a density of 1.00 g / cm ３ a negative electrode containing a Si-containing negative electrode active material and graphite, and a negative electrode active material layer having a density of 1.00 g / cm ３ and a negative electrode containing a titanium-containing oxide negative electrode active material and having a density of 1.50 g / cm ３ The nonaqueous electrolyte battery of the present disclosure includes at least one of the above-described negative electrodes. It may further include a separator, an exterior body, etc. Furthermore, a solid electrolyte may be used as a medium for impregnating the nonaqueous electrolyte solution instead of the separator. The nonaqueous electrolyte battery of the present disclosure includes at least a positive electrode, a negative electrode, and the nonaqueous electrolyte solution of the present disclosure, and it is preferable that at least one of the positive electrode and the negative electrode is at least one of the specific electrodes. It is preferable that the nonaqueous electrolyte battery of the present disclosure is a nonaqueous electrolyte secondary battery.

[0079] [Negative electrode] The negative electrode contains graphite as a negative electrode active material and the density of the negative electrode active material layer is 1.00 g / cm ３ a negative electrode containing a Si-containing negative electrode active material and graphite, and a negative electrode active material layer having a density of 1.00 g / cm ３ and a negative electrode containing a titanium-containing oxide negative electrode active material and having a density of 1.50 g / cm ３ As long as the nonaqueous electrolyte battery of the present disclosure has at least one of the above-mentioned specific electrodes, other negative electrodes may also be used.

[0080] The density of the negative electrode active material layer containing graphite negative electrode active material is 1.00 g / cm ３Negative electrode above <Negative electrode active material> (Graphite negative electrode active material) Examples of graphite negative electrode active materials include artificial graphite and natural graphite, and examples of the shape of graphite include scaly, flaky, spherical, and clay-like. Examples of artificial graphite include carbon materials having a d value of the (002) lattice plane in X-ray diffraction of 0.350 nm or less, such as pyrolytic carbons, cokes (e.g., pitch coke, needle coke, petroleum coke, etc.), graphites, organic polymer compound sintered bodies (e.g., phenolic resins, furan resins, etc., sintered at an appropriate temperature and carbonized), carbon fiber, activated carbon, etc. may also be graphitized. As the graphite negative electrode active material, one type may be used alone, or two or more types of compounds may be used in combination. Furthermore, a simple substance or a compound containing one or more elements selected from the group consisting of B, C, N, F, Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Zn, Zr, and W may be present on a part or all of the surface of the graphite particles.

[0081] The graphite negative electrode active material may be used alone or in combination with other negative electrode active materials, such as a negative electrode active material containing a Si-containing negative electrode active material and graphite, or a titanium-containing oxide, which will be described later. When other negative electrode active materials are used, the content of the other negative electrode active materials is preferably less than 50% by mass, and more preferably 25% by mass or less, based on the total amount of the negative electrode active materials.

[0082] <Negative electrode current collector> The negative electrode has a negative electrode current collector. Examples of the negative electrode current collector that can be used include copper, stainless steel, nickel, titanium, and alloys thereof. For sodium ion batteries, aluminum and its alloys can also be used.

[0083] <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. It is preferable that a negative electrode active material layer be formed on both surfaces of the 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.

[0084] <Density of Negative Electrode Active Material Layer> The density of the negative electrode active material layer containing graphite negative electrode active material is 1.00 g / cm ３ or more, and 1.10 g / cm ３ or more, 1.20 g / cm ３ or more, 1.30 g / cm ３ or more, 1.40 g / cm ３ or more, 1.50 g / cm ３ and may be greater than 1.60 g / cm ３ or more, 1.70 g / cm ３ The density of the negative electrode active material layer containing the graphite negative electrode active material may be 3 g / cm or more. ３ Preferably, it is 2.5 g / cm or less. ３ or less, and ３ or less, 2.2 g / cm ３ or less, 2.1 g / cm ３ or less, and ３ The density of the negative electrode active material layer containing the graphite negative electrode active material may be 1.00 to 3 g / cm ３ It is preferable that:

[0085] The density of the negative electrode active material layer containing Si-containing negative electrode active material and graphite is 1.00 g / cm ３ Negative electrode <Negative electrode active material> (Si-containing negative electrode active material) The Si-containing negative electrode active material is preferably at least one selected from the group consisting of Si and Si metal oxides. Si and Si metal oxides are collectively referred to as Si-containing compounds in this specification. Examples of Si-containing compounds include Si, SiOx (0<x≦2), SiC, SiN, etc., and SiOx and SiC are preferred from the viewpoint of reversibly extractable capacity and cycle characteristics. The range of x is preferably 0.1 to 1.6, more preferably 0.3 to 1.4. In addition, a simple substance or a compound containing one or more elements selected from the group consisting of B, C, N, F, Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Zn, Zr, and W may be present on part or all of the surface of the Si-containing compound particles.

[0086] As the graphite, the graphite described above in the graphite negative electrode active material can be used.

[0087] The total content of the Si-containing negative electrode active material contained in the negative electrode active material may be 0.1 to 50 mass %, preferably 0.1 to 30 mass %, and more preferably 1 to 25 mass %, when the total amount of the Si-containing negative electrode active material and graphite contained in the negative electrode active material is taken as 100 mass %.

[0088] The negative electrode active material containing the Si-containing negative electrode active material and graphite may be used alone or in combination with other negative electrode active materials such as a graphite negative electrode active material or a titanium-containing oxide described below. When other negative electrode active materials are used, the content of the other negative electrode active materials is preferably less than 50 mass % and more preferably 25 mass % or less relative to the total amount of the negative electrode active materials.

[0089] The above description can be applied to the negative electrode current collector and the negative electrode active material layer as is.

[0090] <Density of Negative Electrode Active Material Layer> The density of the negative electrode active material layer containing the Si-containing negative electrode active material and graphite was 1.00 g / cm ３ or more, and 1.10 g / cm ３or more, 1.20 g / cm ３ or more, 1.30 g / cm ３ or more, 1.40 g / cm ３ or more, 1.50 g / cm ３ or more, 1.60 g / cm ３ The density of the negative electrode active material layer containing the Si-containing negative electrode active material and graphite may be 3 g / cm or more. ３ Preferably, it is 2.5 g / cm or less. ３ or less, and ３ or less, 2.2 g / cm ３ or less, 2.1 g / cm ３ or less, and ３ The density of the negative electrode active material layer containing the Si-containing negative electrode active material and graphite may be 1.00 to 3 g / cm ３ It is preferable that:

[0091] The density of the negative electrode active material layer containing a titanium-containing oxide negative electrode active material is 1.50 g / cm ３ Negative electrode having the above structure <Negative electrode active material> (Titanium-containing oxide) Examples of the titanium-containing oxide include anatase-type titanium dioxide, rutile-type titanium dioxide, brookite-type titanium dioxide, spinel-type lithium titanate, ramsdellite-type lithium titanate, and monoclinic niobium-titanium composite oxide. From the viewpoint of reversible capacity and cycle characteristics, brookite-type titanium dioxide, spinel-type lithium titanate, and monoclinic niobium-titanium composite oxide are preferred, and spinel-type lithium titanate is more preferred. Specifically, Li ４＋α Ti ５ O １２ (α varies within the range of 0≦α≦3 depending on the charge / discharge reaction), Li ２＋β Ti ３ O ７(β varies within the range of 0≦β≦3 depending on the charge / discharge reaction). Titanium-containing oxides may be used alone as the negative electrode active material, or two or more types of compounds may be used in combination. Furthermore, some of the titanium atoms may be substituted with other elements such as Mg, Al, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, and Zr. Furthermore, a simple substance or a compound containing one or more elements selected from the group consisting of B, C, N, F, Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Zn, Zr, and W may be present on part or all of the surface of the titanium-containing oxide particles.

[0092] The titanium-containing oxide may be used alone or in combination with other negative electrode active materials such as a graphite negative electrode active material or a negative electrode active material containing a Si-containing negative electrode active material and graphite. When the other negative electrode active material is used, the content of the other negative electrode active material is preferably less than 50 mass % and more preferably 25 mass % or less relative to the total amount of the negative electrode active material.

[0093] The above description can be applied to the negative electrode current collector and the negative electrode active material layer as is.

[0094] <Density of Negative Electrode Active Material Layer> The density of the negative electrode active material layer containing a titanium-containing oxide negative electrode active material is 1.50 g / cm ３ or more, and 1.60 g / cm ３ or more, 1.70 g / cm ３ or more, 1.80 g / cm ３ or more, 1.90 g / cm ３ or more, and 2.00 g / cm ３ or more, 2.10 g / cm ３ or more, 2.20 g / cm ３ The density of the titanium-containing oxide negative electrode active material may be 3 g / cm or more. ３ It is preferable that the density is 2.9 g / cm or less. ３ or less, 2.8 g / cm ３ or less, 2.7 g / cm ３ or less, 2.6 g / cm ３or less, and 2.5 g / cm ３ The density of the negative electrode active material layer containing the titanium-containing oxide negative electrode active material may be 1.50 to 3 g / cm ３ It is preferable that:

[0095] Other Negative Electrodes Preferred examples of other negative electrodes include negative electrodes that contain, as a negative electrode active material, one or more metals selected from lithium metal, hard carbon, Sn, and Al, or alloys containing these metals, or alloys of these metals and lithium, or Si-containing negative electrode active material and graphite, and do not correspond to the specific electrodes.

[0096] [Positive Electrode] The positive electrode contains a layered rock salt type positive electrode active material and the density of the positive electrode active material layer is 2.50 g / cm ３ a positive electrode containing an olivine-type positive electrode active material and having a positive electrode active material layer with a density of 1.50 g / cm ３ and a positive electrode containing a spinel-type positive electrode active material and having a density of 2.00 g / cm ３ As long as the nonaqueous electrolyte battery of the present disclosure has at least one of the above-mentioned specific electrodes, other positive electrodes may also be used.

[0097] The density of the positive electrode active material layer containing the layered rock salt type positive electrode active material is 2.50 g / cm ３ The above positive electrode <Positive electrode active material> (Layered rock salt type positive electrode active material) The layered rock salt type positive electrode active material is Li １＋ａ M １ O ２ (-0.2≦a≦0.1), and M １ is at least one element selected from the group consisting of Mn, Co, and Ni. １ may be partially substituted with other elements such as Mg, Al, Ti, V, Cr, Fe, Cu, Zn, Zr, Ta, etc. Furthermore, the layered rock salt type positive electrode active material may have, on a part or all of the particle surface, a simple substance or a compound containing one or more elements selected from the group consisting of Li, B, C, N, F, Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Zn, Zr, and W.

[0098] For example, the above Li １＋ａM １ O ２ Examples of the compound represented by the formula (I) include lithium-cobalt composite oxide, lithium-nickel composite oxide, lithium-nickel-cobalt composite oxide, lithium-nickel-cobalt-aluminum composite oxide, lithium-cobalt-manganese composite oxide, lithium-nickel-manganese composite oxide, and lithium-nickel-manganese-cobalt composite oxide. Specific examples include LiCoO ２ , LiNiO ２ , Li[Ni 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 , 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 , Li[Ni ０．８ Co ０．２ ]O ２ , Li[Ni ０．８５ Co ０．１０ Al ０．０５ ]O ２ , Li[Ni ０．８７ Co ０．１０ Al ０．０３ ]O ２ , Li[Ni ０．９０ Co ０．０７ Al ０．０３ ]O ２ , Li[Ni ０．６ Co ０．３ Al ０．１]O ２ , Li １．０５ [Ni ０．８ Co ０．１ Mn ０．１ ]O ２ , Li １．1 [Ni ０．２ Mn ０．８ ]O ２ etc.

[0099] The layered rock salt type positive electrode active material is yLiM ２ O ２ (1-y)Li ２ M ３ O ３ (y is a number that satisfies 0<y<1, and M ２ has an average oxidation number of 3 ＋ At least one metal element is M ３ has an average oxidation number of 4 ＋ At least one metal element is ２ is preferably one metal element selected from trivalent V, Cr, Mn, Fe, Co, and Ni, but the average oxidation number may be trivalent with equal amounts of divalent and tetravalent metals. ３ is preferably one or more metal elements selected from Ti, Mn, and Zr.

[0100] The above yLiM ２ O ２ (1-y)Li ２ M ３ O ３ Specifically, the lithium-excess layered transition metal oxide represented by the formula (I) is 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 ２MnO 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 ] etc.

[0101] As the layered rock salt type positive electrode active material, the above Li １＋ａ M １ O ２ or yLiM ２ O ２ (1-y)Li ２ M ３ O ３ The compound represented by the formula (I) may be used alone or in combination of two or more compounds.

[0102] Furthermore, the positive electrode active material may be used in combination with a positive electrode active material having not only a layered rock salt structure but also another structure such as an olivine structure or a spinel structure. When a positive electrode active material having another structure is used, the content of the positive electrode active material having another structure is preferably less than 50 mass % and more preferably 25 mass % or less with respect to the total amount of the positive electrode active material.

[0103] <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.

[0104] <Positive Electrode Active Material Layer> The positive electrode has, for example, a positive electrode active material layer formed on at least one surface of a positive electrode current collector. Preferably, positive electrode active material layers are formed on both surfaces of the 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 above 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.

[0105] <Density of Positive Electrode Active Material Layer> The density of the positive electrode active material layer containing the layered rock salt type positive electrode active material is 2.50 g / cm ３ or more, and 2.60 g / cm ３ or more, 2.70 g / cm ３ or more, 2.80 g / cm ３ or more, 2.90 g / cm ３ or more, and 3.00 g / cm ３ and may be greater than 3.10 g / cm ３ or more, 3.20 g / cm ３ The density of the positive electrode active material layer containing the layered rock salt type positive electrode active material may be 5 g / cm or more. ３ Preferably, it is 4.5 g / cm or less. ３ or less, 4.25 g / cm ３ or less, and ３ or less, 3.9 g / cm ３ or less, 3.8 g / cm ３ The density of the positive electrode active material layer containing the layered rock salt type positive electrode active material may be 2.50 to 5 g / cm ３ It is preferable that:

[0106] The density of the positive electrode active material layer containing an olivine type positive electrode active material is 1.50 g / cm ３ The above positive electrode <Positive electrode active material> (Olivine type positive electrode active material) The olivine type positive electrode active material is Li ｂ M４ P.O. ４ (0<b≦1), and M ４ is at least one element selected from the group consisting of Mn, Fe, Co, and Ni. ４ From the viewpoint of battery capacity and cycle characteristics, M preferably contains Fe, Mn, or both Fe and Mn, and more preferably contains Fe or both Fe and Mn. ４ A part of these elements may be substituted with other elements such as Mg, Al, Ti, V, Cr, Zr, etc. The olivine-type positive electrode active material may have, on a part or all of the particle surface, a simple substance or a compound containing one or more elements selected from the group consisting of B, C, N, F, Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Zn, Zr, and W.

[0107] The above Li ｂ M ４ P.O. ４ Specifically, LiMnPO ４ , LiFePO ４ , LiCoPO ４ , LiNiPO ４ , LiFe ０．５ Mn ０．５ P.O. ４ , LiFe ０．４ Mn ０．６ P.O. ４ , LiFe ０．３ Mn ０．７ P.O. ４ , LiFe ０．５ Mn ０．４ Mg ０．１ P.O. ４ , LiFe ０．５ Mn ０．４５ Zr ０．０５ P.O. ４ etc.

[0108] Li as an olivine-type positive electrode active material ｂ M ４ P.O. ４ The compound represented by the formula (I) may be used alone or in combination of two or more compounds.

[0109] Furthermore, the positive electrode active material may be used in combination with a positive electrode active material having not only an olivine structure but also another structure such as a layered rock salt structure or a spinel structure. When a positive electrode active material having another structure is used, the content of the positive electrode active material having another structure is preferably less than 50 mass % and more preferably 25 mass % or less with respect to the total amount of the positive electrode active material.

[0110] The above description can be applied to the positive electrode current collector and the positive electrode active material layer as is.

[0111] <Density of Positive Electrode Active Material Layer> The density of the positive electrode active material layer containing the olivine type positive electrode active material is 1.50 g / cm ３ or more, and 1.60 g / cm ３ or more, 1.70 g / cm ３ or more, 1.80 g / cm ３ or more, 1.90 g / cm ３ or more, and 2.00 g / cm ３ or more, 2.10 g / cm ３ or more, 2.20 g / cm ３ The density of the positive electrode active material layer containing the olivine type positive electrode active material may be 3 g / cm or more. ３ It is preferable that the density is 2.9 g / cm or less. ３ or less, 2.8 g / cm ３ or less, 2.7 g / cm ３ or less, 2.6 g / cm ３ or less, and 2.5 g / cm ３ The density of the positive electrode active material layer containing the olivine type positive electrode active material may be 1.50 to 3 g / cm ３ It is preferable that:

[0112] The density of the positive electrode active material layer containing a spinel-type positive electrode active material is 2.00 g / cm ３ The above positive electrode <Positive electrode active material> (Spinel type positive electrode active material) The spinel type positive electrode active material is Li ｃ M ５ O ４―ｄ D ｄ (0<c≦1) (0≦d≦1), and M５ is at least one element selected from the group consisting of Mn, Co, and Ni. D may be a halogen atom, particularly a fluorine atom. ５ may be partially substituted with other elements such as Mg, Al, Ti, V, Cr, Fe, Cu, Zn, Ga, Zr, Ta, etc. In addition, the spinel-type positive electrode active material may have, on a part or all of the particle surface, a simple substance or a compound containing one or more elements selected from the group consisting of Li, B, C, N, F, Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Zn, Zr, and W.

[0113] For example, the above Li ｃ M ５ O ４―ｄ D ｄ Examples of the compound represented by the formula (I) include lithium manganese composite oxide and lithium manganese-nickel composite oxide. ２ O ４ , LiMn １．９５ Al ０．０５ O ４ , LiMn １．９ Al ０．１ O ４ , LiMn １．９ Ni ０．１ O ４ , LiMn １．５ Ni ０．５ O ４、 LiMn １．５ Ni ０．４５ Fe ０．０５ O ４ Also, LiMn １．５ Ni ０．５ O ３．９５ F ０．０５ Specific examples include the following. A preferred embodiment is one in which d is 0.

[0114] As a spinel-type positive electrode active material, the above Li ｃ M ５ O ４―ｄ D ｄ The compound represented by the formula (I) may be used alone or in combination of two or more compounds.

[0115] Furthermore, the cathode active material may be used in combination with a cathode active material having not only a spinel structure but also another structure such as a layered rock salt structure or an olivine structure. When a cathode active material having another structure is used, the content of the cathode active material having another structure is preferably less than 50% by mass, and more preferably 25% by mass or less, based on the total amount of the cathode active material.

[0116] The above description can be applied to the positive electrode current collector and the positive electrode active material layer as is.

[0117] <Density of Positive Electrode Active Material Layer> The density of the positive electrode active material layer containing a spinel-type positive electrode active material is 2.00 g / cm ３ or more, and 2.10 g / cm ３ or more, 2.20 g / cm ３ or more, and 2.30 g / cm ３ or more, 2.40 g / cm ３ or more, 2.50 g / cm ３ or more, 2.60 g / cm ３ or more, 2.70 g / cm ３ The density of the positive electrode active material layer containing the spinel-type positive electrode active material may be 4 g / cm or more. ３ Preferably, it is 3.75 g / cm or less. ３ or less, 3.5 g / cm ３ or less, 3.4 g / cm ３ or less, 3.3 g / cm ３ or less, 3.2 g / cm ３ The density of the positive electrode active material layer containing the spinel-type positive electrode active material may be 2.00 to 4 g / cm ３ It is preferable that:

[0118] Other Positive Electrodes The other positive electrodes are not particularly limited, but include the positive electrodes shown below that do not fall under the category of specific electrodes.

[0119] <Positive electrode active material> For example, when the cation is lithium, the positive electrode material (positive electrode active material) may be the layered rock salt type positive electrode active material, the olivine type positive electrode active material, the spinel type positive electrode active material, or TiO ２ , V２ 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.

[0120] 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 M００１ β [Fe(CN) ６ ] γ The 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.

[0121] The above description can be applied to the positive electrode current collector and the positive electrode active material layer as is.

[0122] [Method for producing electrodes (positive electrode and negative electrode)] The electrodes can be obtained, for example, by dispersing and kneading an active material, a binder, and, if necessary, a conductive agent in predetermined blending amounts in a solvent such as N-methyl-2-pyrrolidone (hereinafter, sometimes referred to as "NMP") or water, applying the resulting paste to a current collector, and drying to form an active material layer.

[0123] The negative electrode active material layer and the positive electrode active material layer may be densified by processing means such as roller pressing. The density of the active material layer can be varied by, for example, changing the roller pressing conditions (pressure, etc.). The density of the electrode active material layer can be calculated from the thickness and mass of an electrode sheet cut into a 5 cm x 5 cm size. The thickness of the electrode sheet is measured using a micrometer (Mitutoyo Coolant-Proof Micrometer MDC-25MX), and the thickness of the current collector is calculated by subtracting the thickness from the measured thickness to obtain the thickness of the electrode active material layer. The mass of the electrode sheet is weighed using an electronic balance (Mettler Toledo Top-Pan Balance MS603TS / A00), and the mass of the current collector is calculated by subtracting the mass from the measured mass to obtain the mass of the electrode active material layer. The density of the electrode active material layer is calculated from the quotient of the mass of the electrode active material layer and the volume of the electrode active material layer.

[0124] The positive electrode and the negative electrode may be formed into a sheet-like electrode sheet.

[0125] [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.

[0126] [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.

[0127] 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.

[0128] 3. Method for manufacturing a nonaqueous electrolyte battery The method for manufacturing a nonaqueous electrolyte battery according to the present disclosure is a method for manufacturing a nonaqueous electrolyte battery comprising: a layered rock salt type positive electrode active material; and a positive electrode active material layer having a density of 2.50 g / cm. ３ a positive electrode containing an olivine-type positive electrode active material and having a positive electrode active material layer with a density of 1.50 g / cm ３ a positive electrode containing a spinel-type positive electrode active material and having a positive electrode active material layer with a density of 2.00 g / cm ３ a positive electrode containing a graphite negative electrode active material and a negative electrode active material layer having a density of 1.00 g / cm ３ a negative electrode containing Si and / or Si metal oxide and graphite, and a negative electrode active material layer having a density of 1.00 g / cm ３ and a negative electrode containing a titanium-containing oxide negative electrode active material and having a density of 1.50 g / cm ３ A method for manufacturing a nonaqueous electrolyte battery includes a step of impregnating at least one of the above negative electrodes with a nonaqueous electrolyte, wherein the nonaqueous electrolyte contains: (I) a solute; (II) a nonaqueous organic solvent; and (III) a compound represented by the following general formula (1):

[0129]

[0130] [In general formula (1), each R independently represents an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, or an aryl group.]

[0131] The above description can be applied to the non-aqueous electrolyte and the non-aqueous electrolyte battery.

[0132] The nonaqueous electrolyte solution of the present disclosure improves the wettability of the specific electrode surface, which reduces the time required to impregnate the specific electrode with the nonaqueous electrolyte solution during the manufacture of a nonaqueous electrolyte battery, i.e., the time required for the standing step for impregnation of the specific electrode with the nonaqueous electrolyte solution after injecting the nonaqueous electrolyte solution into a battery cell, thereby improving the production efficiency of nonaqueous electrolyte batteries.

[0133] The present disclosure will be specifically described below using examples, but the present disclosure is not limited to such examples.

[0134] The compounds of formula (III) used in each example are shown below.

[0135]

[0136] [Preparation of Nonaqueous Electrolytes in Examples and Comparative Examples] [Non-aqueous Electrolyte No. 0] EC, DMC, and EMC were used as non-aqueous organic solvents and mixed in a volume ratio of EC:DMC:EMC = 3:3:4. Next, LiPF 6 was added as a solute. ６ was added and dissolved in the non-aqueous electrolyte so that the content thereof became 1.0 mol / L, thereby preparing non-aqueous electrolyte No. 0 as a comparative non-aqueous electrolyte.

[0137] [Non-aqueous electrolyte solutions Nos. 1 to 6] The non-aqueous electrolyte solutions (nonaqueous electrolyte solutions Nos. 1 to 3, 4-1 to 4-7, and 5 to 9) shown in Table 1-1 were prepared in the same manner as non-aqueous electrolyte solution No. 0, except that the compound represented by general formula (1) (III) shown in Table 1-1 (hereinafter, also referred to as "component (III)") was added and dissolved in an amount corresponding to the content shown in Table 1-1 relative to the total amount of the non-aqueous electrolyte solution.

[0138] [Preparation of layered rock salt type positive electrode (a-6)] Li[Ni ０．８ Mn ０．１ Co ０．１ ]O ２A positive electrode composite paste was prepared by mixing 93.0 mass% of NCM811 powder with 3.0 mass% of polyvinylidene fluoride (hereinafter also referred to as "PVDF") as a binder and 4.0 mass% of acetylene black as a conductive material, and then adding NMP. This paste was applied to both sides of aluminum foil (A1085) and dried, after which the active material layer density was 3.55 g / cm. ３ The pressed electrode was punched out to a size of 5 cm x 5 cm to obtain a layered rock salt type positive electrode a-6.

[0139] [Preparation of layered rock salt type positive electrodes (a-1 to a-5, a-7 to a-9) with variously changed active material layer densities] Layered rock salt type positive electrodes a-1 to a-5 and a-7 to a-9 were obtained in the same manner as the layered rock salt type positive electrode a-6, except that roll pressing was performed under variously changed roll pressing conditions (pressure) so as to achieve the predetermined active material layer densities shown in Table 1-1.

[0140] [Preparation of Olivine-Type Positive Electrode (b-3)] LiFePO ４ 91.0 mass% of the powder was mixed with 4.0 mass% of PVDF as a binder and 5.0 mass% of acetylene black as a conductive material, and NMP was further added to prepare a positive electrode composite paste. This paste was applied to both sides of an aluminum foil (A1085) and dried, after which the active material layer density was 2.40 g / cm. ３ The pressed electrode was punched out to a size of 5 cm x 5 cm to obtain an olivine type positive electrode b-3.

[0141] [Preparation of Olivine Type Positive Electrodes (b-1, b-2, b-4, b-5) with Variously Changed Active Material Layer Densities] Olivine type positive electrodes b-1, b-2, b-4, and b-5 were obtained in the same manner as the olivine type positive electrode b-3, except that roll pressing was performed under variously changed roll pressing conditions (pressure) so as to achieve the predetermined active material layer densities shown in Table 2-1.

[0142] [Preparation of Spinel-Type Positive Electrode (c-3)] LiMn ２ O ４92.0% by mass of the powder was mixed with 4.0% by mass of PVDF as a binder and 4.0% by mass of acetylene black as a conductive material, and NMP was further added to prepare a positive electrode composite paste. This paste was applied to both sides of an aluminum foil (A1085) and dried, after which the active material layer density was 3.02 g / cm. ３ The pressed electrode was punched out to a size of 5 cm x 5 cm, thereby obtaining a spinel-type positive electrode c-3.

[0143] [Preparation of Spinel-Type Positive Electrodes (c-1, c-2, c-4, c-5) with Variously Changed Active Material Layer Densities] Spinel-type positive electrodes c-1, c-2, c-4, and c-5 were obtained in the same manner as in the spinel-type positive electrode c-3, except that roll pressing was performed under variously changed roll pressing conditions (pressure) so as to achieve the predetermined active material layer densities shown in Table 3-1.

[0144] [Preparation of Graphite Negative Electrode (d-4)] 94.5% by mass of artificial graphite powder was mixed with 2.0% by mass of acetylene black, 0.5% by mass of carbon nanofiber, 2.0% by mass of styrene-butadiene rubber, and 1.0% by mass of sodium carboxymethyl cellulose, and water was added to prepare a negative electrode composite paste. This paste was applied to both sides of copper foil and dried, resulting in an active material layer density of 1.74 g / cm. ３ The pressed electrode was punched out to a size of 5 cm x 5 cm to obtain a graphite negative electrode d-4.

[0145] [Preparation of Graphite Negative Electrodes (d-1 to d-3, d-5, d-6) with Variously Changed Active Material Layer Densities] Graphite negative electrodes d-1 to d-3, d-5, and d-6 were obtained in the same manner as graphite negative electrode d-4, except that roll pressing was performed under variously changed roll pressing conditions (pressure) so as to achieve the predetermined active material layer densities shown in Table 4-1.

[0146] [Preparation of a negative electrode containing a Si-containing negative electrode active material and graphite (hereinafter also referred to as "Si-graphite negative electrode") (e-3)] 85.0% by mass of artificial graphite powder was mixed with 8.0% by mass of SiOx (x = 1), 3.0% by mass of acetylene black, 1.0% by mass of carbon nanofiber, 2.0% by mass of styrene butadiene rubber, and 1.0% by mass of sodium carboxymethyl cellulose, and water was further added to prepare a negative electrode composite paste. This paste was applied to both sides of copper foil and dried, and the active material layer density was 1.69 g / cm. ３ The pressed electrode was punched out to a size of 5 cm x 5 cm to obtain a Si-graphite negative electrode e-3.

[0147] [Preparation of Si-graphite negative electrodes (e-1, e-2, e-4, e-5) with variously changed active material layer densities] Si-graphite negative electrodes e-1, e-2, e-4, and e-5 were obtained in the same manner as Si-graphite negative electrode e-3, except that roll pressing was performed under variously changed roll pressing conditions (pressure) so as to achieve the predetermined active material layer densities shown in Table 5-1.

[0148] [Preparation of Titanium-Containing Oxide Negative Electrode (f-3)] Lithium titanate (Li) having a spinel structure ４ Ti ５ O １２ (hereinafter also referred to as "LTO"), 4.0% by mass of acetylene black, 0.5% by mass of carbon nanofiber, and 4.0% by mass of PVDF as a binder were mixed, and NMP was further added to prepare a negative electrode composite paste. This paste was applied to both sides of a copper foil and dried, after which the active material layer density was 2.31 g / cm ３ The pressed electrode was punched out to a size of 5 cm x 5 cm to obtain a titanium-containing oxide negative electrode f-3.

[0149] [Preparation of titanium-containing oxide negative electrodes (f-1, f-2, f-4, f-5) with variously changed active material layer densities] Titanium-containing oxide negative electrodes f-1, f-2, f-4, and f-5 were obtained in the same manner as titanium-containing oxide negative electrode f-3, except that roll pressing was performed under variously changed roll pressing conditions (pressure) so as to achieve the predetermined active material layer densities shown in Table 6-1.

[0150] [Example 1-1] In a dew point environment of -45°C and at 25°C, 5 μL of nonaqueous electrolyte No. 1 was dropped onto the positive electrode active material (NCN811) layer of the layered rock salt type positive electrode a-6 obtained above using a microsyringe (Hamilton syringe 7105KH), and a video was taken from above using a camera. The areas of the droplets 3 seconds and 15 seconds after the droplets had landed were calculated by binarization, and the increase in the droplet area was evaluated. The results are shown in Tables 1-1 and 1-2.

[0151] [Examples and Comparative Examples Relating to Tables 1-1 to 6-2] Evaluations were carried out in the same manner as in Example 1-1, except that the electrodes and non-aqueous electrolyte solutions used were changed to those shown in the respective tables. The respective results are shown in the respective tables.

[0152] The droplet area increase in the tables indicates a relative value when Comparative Example 1-1 in Tables 1-1 and 1-2, Comparative Example 2-1 in Tables 2-1 and 2-2, Comparative Example 3-1 in Tables 3-1 and 3-2, Comparative Example 4-1 in Tables 4-1 and 4-2, Comparative Example 5-1 in Tables 5-1 and 5-2, and Comparative Example 6-1 in Tables 6-1 and 6-2 are set to 100.

[0153]

[0154]

[0155]

[0156]

[0157]

[0158]

[0159]

[0160]

[0161]

[0162]

[0163]

[0164]

[0165] The results in Tables 1-1 to 6-2 show that when a nonaqueous electrolyte solution of the present disclosure containing component (III) is used, the wettability to the electrode surface is improved compared to when a comparative nonaqueous electrolyte solution not containing component (III) is used. Furthermore, Tables 1-2, 2-2, 3-2, 4-2, 5-2, and 6-2 show that, among component (III), the use of compounds (1) to (4) and (7) to (9) further improves wettability.

[0166] According to the present disclosure, it is possible to provide a nonaqueous electrolyte that can improve wettability to the electrode surface even in a nonaqueous electrolyte battery having an electrode with an active material layer density equal to or greater than a specific value, a nonaqueous electrolyte battery including the electrode and the nonaqueous electrolyte, and a method for manufacturing the nonaqueous electrolyte battery.

[0167] 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. 2024-028752) filed on February 28, 2024, the contents of which are incorporated herein by reference.

Claims

1. A layered rock salt type positive electrode active material is contained, and the density of the positive electrode active material layer is 2.50 g / cm ３ a positive electrode containing an olivine-type positive electrode active material and having a positive electrode active material layer with a density of 1.50 g / cm ３ a positive electrode containing a spinel-type positive electrode active material and having a positive electrode active material layer with a density of 2.00 g / cm ３ a positive electrode containing a graphite negative electrode active material and a negative electrode active material layer having a density of 1.00 g / cm ３ a negative electrode containing a Si-containing negative electrode active material and graphite, and a negative electrode active material layer having a density of 1.00 g / cm ３ and a negative electrode containing a titanium-containing oxide negative electrode active material and having a density of 1.50 g / cm ３ A nonaqueous electrolyte solution for a nonaqueous electrolyte battery including at least one of the above negative electrodes, the nonaqueous electrolyte solution comprising: (I) a solute; (II) a nonaqueous organic solvent; and (III) a compound represented by the following general formula (1): [In general formula (1), each R independently represents an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, or an aryl group.] 2. The nonaqueous electrolyte battery contains a layered rock salt type positive electrode active material and the density of the positive electrode active material layer is 2.50 to 5 g / cm ３ a positive electrode containing an olivine-type positive electrode active material and having a positive electrode active material layer with a density of 1.50 to 3 g / cm ３ a positive electrode containing a spinel-type positive electrode active material and having a positive electrode active material layer having a density of 2.00 to 4 g / cm ３ a positive electrode containing a graphite negative electrode active material and a negative electrode active material layer having a density of 1.00 to 3 g / cm ３ a negative electrode comprising a Si-containing negative electrode active material and graphite, and a negative electrode active material layer having a density of 1.00 to 3 g / cm ３ and a negative electrode containing a titanium-containing oxide negative electrode active material and having a density of a negative electrode active material layer of 1.50 to 3 g / cm ３ The nonaqueous electrolyte according to claim 1 , comprising at least one negative electrode:

3. The nonaqueous electrolyte according to claim 1, wherein R in the general formula (1) is an alkyl group having a fluorine atom.

4. The non-aqueous electrolyte according to claim 1, wherein the content of (III) is 0.015 to 9 mass % relative to the total amount of the non-aqueous electrolyte.

5. The nonaqueous electrolyte solution according to claim 1, wherein (III) is at least one selected from the group consisting of tris(1,1,1,3,3,3-hexafluoro-2-propyl) phosphite, tris(2,2,2-trifluoroethyl) phosphite, tris(2,2-difluoroethyl) phosphite, and tris(2-fluoroethyl) phosphite.

6. The above (I) is LiPF ６ , LiBF ４ , LiSbF ６ , LiAsF ６ , LiClO ４ , LiN(FSO ２ ) ２ , LiAlO ２ , LiAlCl ４ 2. The nonaqueous electrolyte according to claim 1, wherein the nonaqueous electrolyte is at least one selected from the group consisting of LiCl, LiI, and LiI.

7. The above (I) is NaPF ６ , NaBF ４ , NaSbF ６ , NaAsF ６ , NaClO ４ , NaN(FSO ２ ) ２ , NaAlO ２ , NaAlCl ４ 2. The nonaqueous electrolyte according to claim 1, wherein the nonaqueous electrolyte is at least one selected from the group consisting of NaCl, NaI, and NaI.

8. The nonaqueous electrolyte according to claim 1, wherein (II) comprises at least one selected from the group consisting of cyclic esters, chain esters, cyclic ethers, chain ethers, sulfone compounds, sulfoxide compounds, and ionic liquids.

9. The nonaqueous electrolyte according to claim 8, wherein the cyclic ester comprises a cyclic carbonate.

10. The nonaqueous electrolyte according to claim 9, wherein the cyclic carbonate comprises at least one selected from the group consisting of ethylene carbonate and propylene carbonate.

11. The nonaqueous electrolyte according to claim 8, wherein the chain ester comprises a chain carbonate.

12. The nonaqueous electrolyte according to claim 11, 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.

13. The nonaqueous electrolyte according to claim 8, 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.

14. The nonaqueous electrolyte solution according to claim 8, wherein the chain ether comprises at least one selected from the group consisting of diethyl ether, dipropyl ether, diisopropyl ether, dibutyl ether, dimethoxymethane, trimethoxymethane, 1,2-dimethoxyethane, diethoxyethane, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether.

15. Furthermore, cyclohexylbenzene, cyclohexylfluorobenzene, biphenyl, 2-fluorobiphenyl, tert-butylbenzene, tert-amylbenzene, 2-fluorotoluene, fluorobenzene, difluoroanisole, vinylene carbonate, vinylene carbonate oligomers (number average molecular weight in terms of polystyrene of 170 to 5000), vinylethylene carbonate, divinylethylene carbonate, fluoroethylene carbonate, ethynylethylene carbonate, trans-difluoroethylene carbonate, methyl propargyl carbonate, ethyl propargyl 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-diisocyanatohexa sultone, maleic anhydride, succinic anhydride, 1,4-dioxane-2,6-dione, glutaric anhydride, methanedisulfonic anhydride, 1,2-ethanedisulfonic anhydride, methanesulfonic anhydride, 2-sulfobenzoic anhydride, 1,3-propanedisulfonic anhydride, 1,3-propanesulfonic anhydride, 1,3-propanesulfonic anhydride, 1,3-propenesultone, 1,4-butanesultone, 2,4-butanesultone, 1,3,2-dioxathiolane-2,2-dioxide, 4-propanesulfonic anhydride Pyr-1,3,2-dioxathiolane-2,2-dioxide, 1,3-dithiolane-1,1,3,3-tetraoxide, 1,3-dithiane-1,1,3,3-tetraoxide, 1,2-oxathiolan-5-one-2,2-dioxide, methylenemethane disulfonate, dimethylenemethane disulfonate, trimethylenemethane disulfonate, methyl methanesulfonate, methanesulfonyl fluoride, ethenesulfonyl fluoride, 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)(trifluoromethanesulfonyl)imide salt, bis(difluorophosphoryl)imide salt, ( The non-aqueous electrolyte solution according to claim 1, comprising at least one selected from the group consisting of (fluorosulfonyl)(lithium carbonyloxymethanesulfonate)imide, (fluorosulfonyl)(carbonyldi(2-propenyl)phosphoryl)imide salt, (carbonyldi(propargyl)phosphoryl)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.

16. A battery comprising at least a positive electrode, a negative electrode, and the nonaqueous electrolyte solution according to any one of claims 1 to 15, wherein at least one of the positive electrode and the negative electrode contains a layered rock salt type positive electrode active material, and the density of the positive electrode active material layer is 2.50 g / cm ３ a positive electrode containing an olivine-type positive electrode active material and having a positive electrode active material layer with a density of 1.50 g / cm ３ a positive electrode containing a spinel-type positive electrode active material and having a positive electrode active material layer with a density of 2.00 g / cm ３ a positive electrode containing a graphite negative electrode active material and a negative electrode active material layer having a density of 1.00 g / cm ３ a negative electrode containing a Si-containing negative electrode active material and graphite, and a negative electrode active material layer having a density of 1.00 g / cm ３ and a negative electrode containing a titanium-containing oxide negative electrode active material and having a density of 1.50 g / cm ３ A non-aqueous electrolyte battery, wherein at least one of the negative electrodes is selected from the above.

17. A layered rock salt type positive electrode active material is included, and the density of the positive electrode active material layer is 2.50 g / cm ３ a positive electrode containing an olivine-type positive electrode active material and having a positive electrode active material layer with a density of 1.50 g / cm ３ a positive electrode containing a spinel-type positive electrode active material and having a positive electrode active material layer with a density of 2.00 g / cm ３ a positive electrode containing a graphite negative electrode active material and a negative electrode active material layer having a density of 1.00 g / cm ３ a negative electrode containing a Si-containing negative electrode active material and graphite, and a negative electrode active material layer having a density of 1.00 g / cm ３ and a negative electrode containing a titanium-containing oxide negative electrode active material and having a density of 1.50 g / cm ３ A method for manufacturing a nonaqueous electrolyte battery, comprising the step of impregnating at least one of the above negative electrodes with a nonaqueous electrolyte, wherein the nonaqueous electrolyte contains: (I) a solute; (II) a nonaqueous organic solvent; and (III) a compound represented by the following general formula (1): [In general formula (1), each R independently represents an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, or an aryl group.]

Images