WO2014157421A1 - 非水電解質二次電池 - Google Patents
非水電解質二次電池 Download PDFInfo
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- WO2014157421A1 WO2014157421A1 PCT/JP2014/058689 JP2014058689W WO2014157421A1 WO 2014157421 A1 WO2014157421 A1 WO 2014157421A1 JP 2014058689 W JP2014058689 W JP 2014058689W WO 2014157421 A1 WO2014157421 A1 WO 2014157421A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/491—Porosity
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to a non-aqueous electrolyte secondary battery.
- a secondary battery that can be repeatedly charged and discharged is suitable as a power source for driving these motors, and a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery that can be expected to have a high capacity and a high output is attracting attention.
- a non-aqueous electrolyte secondary battery generally includes a positive electrode having a positive electrode active material layer containing a positive electrode active material (for example, a lithium-transition metal composite oxide) and a negative electrode active material (for example, a carbonaceous material such as graphite). And a negative electrode having a negative electrode active material layer including a battery element laminated with a separator interposed therebetween.
- a positive electrode active material for example, a lithium-transition metal composite oxide
- a negative electrode active material for example, a carbonaceous material such as graphite
- the binder for binding the active material used in the active material layer is an organic solvent binder (a binder that does not dissolve / disperse in water but dissolves / disperses in an organic solvent) and an aqueous binder (a binder that dissolves / disperses in water). )are categorized.
- the organic solvent-based binder requires a large amount of cost for materials, recovery, and disposal of the organic solvent, which may be industrially disadvantageous.
- water-based binders make it easy to procure water as a raw material, and since steam is generated during drying, capital investment in the production line can be greatly suppressed, and the environmental burden is reduced. There is an advantage that you can. Further, the water-based binder has an advantage that the binding effect is large even in a small amount compared to the organic solvent-based binder, the active material ratio per volume can be increased, and the capacity of the negative electrode can be increased.
- Patent Document 1 discloses a nonaqueous electrolyte secondary battery using styrene butadiene rubber (SBR), which is an aqueous binder, as a negative electrode binder.
- SBR styrene butadiene rubber
- the amount of gas generated from the electrode is larger than when the organic solvent binder is used.
- the amount of gas generated increases, battery characteristics may be affected, and the battery capacity may be reduced particularly when the battery is used for a long period of time.
- the present invention provides a non-aqueous solution that can efficiently discharge the generated gas to the outside of the electrode when a water-based binder is used as the binder of the negative electrode active material layer, and the battery capacity does not decrease even when used for a long time.
- An object is to provide an electrolyte secondary battery.
- the present inventors have conducted intensive research to solve the above problems. As a result, it has been found that the above problem can be solved by providing a high porosity layer having a specific porosity and thickness between the negative electrode active material layer and the separator, and the present invention has been completed.
- the present invention provides a power generation element including a positive electrode in which a positive electrode active material layer is formed on the surface of a positive electrode current collector, a negative electrode in which a negative electrode active material layer is formed on the surface of a negative electrode current collector, and a separator.
- the present invention relates to a non-aqueous electrolyte secondary battery having
- the negative electrode active material layer includes an aqueous binder, and has a higher porosity than the separator between the negative electrode active material layer and the separator.
- the ratio of the thickness of the high porosity layer to the thickness of the negative electrode active material layer is 0.01 to 0.4.
- 1 is a schematic cross-sectional view showing a basic configuration of a non-aqueous electrolyte lithium ion secondary battery that is not a flat type (stacked type) bipolar type, which is an embodiment of an electric device.
- 1 is a plan view of a nonaqueous electrolyte secondary battery which is a preferred embodiment of the present invention. It is an arrow line view from A of FIG. 2A.
- the present invention provides a power generation element including a positive electrode in which a positive electrode active material layer is formed on the surface of a positive electrode current collector, a negative electrode in which a negative electrode active material layer is formed on the surface of a negative electrode current collector, and a separator.
- the negative electrode active material layer includes a water-based binder, and has a high porosity layer having a higher porosity than the separator between the negative electrode active material layer and the separator, and the high porosity layer has pores.
- the nonaqueous electrolyte secondary battery has a rate of 50 to 90% and a ratio of the thickness of the high porosity layer to the thickness of the negative electrode active material layer of 0.01 to 0.4.
- the present invention by providing a high porosity layer having a specific porosity between the negative electrode active material layer and the separator, gas generated on the negative electrode surface during the first charge / discharge is moved via the high porosity layer. be able to.
- the gas generated by controlling the thickness of the high pore layer within a predetermined range can be quickly released out of the battery element. Therefore, even when a water-based binder that generates a large amount of gas compared to an organic solvent-based binder is used, the heterogeneous reaction on the negative electrode surface can be suppressed, and the decrease in battery capacity is small even when used for a long time. A water electrolyte secondary battery can be obtained.
- the water-based binder can use water as a solvent in producing the active material layer, there are various advantages and the binding force for binding the active material is high.
- the present inventors have found that when a water-based binder is used for the negative electrode active material layer, there is a problem that a large amount of gas is generated at the first charge / discharge compared to a negative electrode using an organic solvent-based binder. . This is because the water of the solvent used for dissolving (dispersing) the aqueous binder remains in the electrode, and this water decomposes into a gas, so that more gas is generated than the organic solvent binder. It is done.
- Non-aqueous electrolyte secondary batteries used as motor drive power sources for automobiles, etc. are larger and have extremely high output characteristics compared to consumer non-aqueous electrolyte secondary batteries used in mobile phones and laptop computers. It is required to have.
- the laminated laminate battery for automobiles whose capacity per unit cell is several to several tens of times that for consumer use, has been enlarged in size to improve energy density. The generation amount is further increased, and further, a heterogeneous reaction on the negative electrode is liable to occur.
- the configuration of the present invention has been completed.
- a high porosity layer having a specific porosity between the negative electrode active material layer and the separator a passage of gas generated on the negative electrode surface during the first charge / discharge can be formed.
- the thickness of the high porosity layer within a predetermined range, it is considered that the high porosity layer is quickly discharged out of the system via the high porosity layer. That is, the configuration of the present invention improves the battery performance by properly discharging the gas vertical passage and the electrode surface passage to smoothly discharge the generated gas out of the system. is there.
- non-aqueous electrolyte lithium ion secondary battery will be described as a preferred embodiment of the non-aqueous electrolyte secondary battery, but is not limited to the following embodiment.
- the same elements are denoted by the same reference numerals, and redundant description is omitted.
- the dimensional ratios in the drawings are exaggerated for convenience of explanation, and may be different from the actual ratios.
- FIG. 1 is a schematic cross-sectional view schematically showing a basic configuration of a non-aqueous electrolyte lithium ion secondary battery (hereinafter also simply referred to as “stacked battery”) that is not a flat (stacked) bipolar type.
- the stacked battery 10 of the present embodiment has a structure in which a substantially rectangular power generation element 21 in which a charge / discharge reaction actually proceeds is sealed inside a battery exterior material 29 that is an exterior body.
- the power generation element 21 has a configuration in which a positive electrode, a separator 17, and a negative electrode are stacked.
- the battery 10 of the present embodiment has a high porosity layer 16 between the negative electrode and the separator 17, and a nonaqueous electrolyte (for example, a liquid electrolyte) is built in the separator 17 and the high porosity layer 16 to form an electrolyte layer. can do.
- the positive electrode has a structure in which the positive electrode active material layers 15 are disposed on both surfaces of the positive electrode current collector 12.
- the negative electrode has a structure in which the negative electrode active material layer 13 is disposed on both surfaces of the negative electrode current collector 11. Specifically, the negative electrode, the electrolyte layer, and the positive electrode are laminated in this order so that one positive electrode active material layer 15 and the negative electrode active material layer 13 adjacent thereto face each other with a separator 17 therebetween.
- the adjacent positive electrode, electrolyte layer, and negative electrode constitute one unit cell layer 19. Therefore, it can be said that the stacked battery 10 shown in FIG. 1 has a configuration in which a plurality of single battery layers 19 are stacked and electrically connected in parallel.
- the negative electrode active material layer 13 is arrange
- the positive electrode current collector 12 and the negative electrode current collector 11 are each provided with a positive electrode current collector plate (tab) 27 and a negative electrode current collector plate (tab) 25 that are electrically connected to the respective electrodes (positive electrode and negative electrode). It has the structure led out of the battery exterior material 29 so that it may be pinched
- the positive electrode current collector 27 and the negative electrode current collector 25 are ultrasonically welded to the positive electrode current collector 12 and the negative electrode current collector 11 of each electrode, respectively, via a positive electrode lead and a negative electrode lead (not shown) as necessary. Or resistance welding or the like.
- the battery according to the present embodiment includes a high porosity layer 16 described later between the negative electrode active material layer 13 and the separator 17.
- FIG. 1 shows a flat battery (stacked battery) that is not a bipolar battery, but a positive electrode active material layer that is electrically coupled to one surface of the current collector and the opposite side of the current collector.
- a bipolar battery including a bipolar electrode having a negative electrode active material layer electrically coupled to the surface.
- one current collector also serves as a positive electrode current collector and a negative electrode current collector.
- the negative electrode active material layer includes a negative electrode active material.
- the negative electrode active material include carbon materials such as graphite (graphite), soft carbon, and hard carbon, lithium-transition metal composite oxides (for example, Li 4 Ti 5 O 12 ), metal materials, lithium alloy negative electrode materials, and the like. Is mentioned. In some cases, two or more negative electrode active materials may be used in combination. Preferably, from the viewpoint of capacity and output characteristics, a carbon material or a lithium-transition metal composite oxide is used as the negative electrode active material. Of course, negative electrode active materials other than those described above may be used.
- the average particle diameter of each active material contained in the negative electrode active material layer is not particularly limited, but is preferably 1 to 100 ⁇ m, more preferably 1 to 30 ⁇ m from the viewpoint of high output.
- the negative electrode active material layer contains at least an aqueous binder.
- water-based binders can be greatly reduced in capital investment on the production line and reduced environmental load because it is water vapor that occurs during drying. There is an advantage. Further, it is not necessary to use an expensive organic solvent to dissolve or disperse the binder, and the cost can be reduced.
- the water-based binder refers to a binder using water as a solvent or a dispersion medium, and specifically includes a thermoplastic resin, a polymer having rubber elasticity, a water-soluble polymer, or a mixture thereof.
- the binder using water as a dispersion medium refers to a polymer that includes all expressed as latex or emulsion and is emulsified or suspended in water.
- kind a polymer latex that is emulsion-polymerized in a system that self-emulsifies.
- water-based binders include styrene polymers (styrene-butadiene rubber, styrene-vinyl acetate copolymer, styrene-acrylic copolymer, etc.), acrylonitrile-butadiene rubber, methyl methacrylate-butadiene rubber, (meta )
- Acrylic polymers polyethyl acrylate, polyethyl methacrylate, polypropyl acrylate, polymethyl methacrylate (methyl methacrylate rubber), polypropyl methacrylate, polyisopropyl acrylate, polyisopropyl methacrylate, polybutyl acrylate, polybutyl methacrylate, polyhexyl acrylate , Polyhexyl methacrylate, polyethylhexyl acrylate, polyethylhexyl methacrylate, polylauryl acrylate, polylauryl methacrylate Acrylate
- the aqueous binder may contain at least one rubber binder selected from the group consisting of styrene-butadiene rubber, acrylonitrile-butadiene rubber, methyl methacrylate-butadiene rubber, and methyl methacrylate rubber from the viewpoint of binding properties. preferable. Furthermore, it is preferable that the water-based binder contains styrene-butadiene rubber because of good binding properties.
- Water-soluble polymers suitable for use in combination with styrene-butadiene rubber include polyvinyl alcohol and modified products thereof, starch and modified products thereof, cellulose derivatives (such as carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, and salts thereof), polyvinyl Examples include pyrrolidone, polyacrylic acid (salt), or polyethylene glycol. Among them, it is preferable to combine styrene-butadiene rubber and carboxymethyl cellulose as a binder.
- the content of the aqueous binder is preferably 80 to 100% by mass, preferably 90 to 100% by mass, and preferably 100% by mass.
- the binder other than the water-based binder include binders used in the following positive electrode active material layer.
- the amount of the binder contained in the negative electrode active material layer is not particularly limited as long as it can bind the active material, but preferably 0.5 to 15% by mass with respect to the active material layer. More preferably, it is 1 to 10% by mass, and particularly preferably 2 to 4% by mass.
- the negative electrode active material layer further includes other additives such as a conductive additive, an electrolyte (polymer matrix, ion conductive polymer, electrolytic solution, etc.), and a lithium salt for improving ion conductivity, as necessary.
- the conductive assistant means an additive blended to improve the conductivity of the positive electrode active material layer or the negative electrode active material layer.
- the conductive auxiliary agent include carbon materials such as carbon black such as acetylene black, graphite, and carbon fiber.
- electrolyte salt examples include Li (C 2 F 5 SO 2 ) 2 N, LiPF 6 , LiBF 4 , LiClO 4 , LiAsF 6 , LiCF 3 SO 3 and the like.
- Examples of the ion conductive polymer include polyethylene oxide (PEO) and polypropylene oxide (PPO) polymers.
- the compounding ratio of the components contained in the negative electrode active material layer and the positive electrode active material layer described later is not particularly limited.
- the blending ratio can be adjusted by appropriately referring to known knowledge about lithium ion secondary batteries.
- the thickness of each active material layer is not particularly limited, and conventionally known knowledge about the battery can be appropriately referred to. As an example, the thickness of each active material layer is about 2 to 100 ⁇ m.
- the method for producing the negative electrode is not particularly limited.
- a negative electrode active material slurry is prepared by mixing a component constituting a negative electrode active material layer containing a negative electrode active material and an aqueous binder and an aqueous solvent which is a slurry viscosity adjusting solvent, After applying this to the surface of the current collector described later, a method of drying and pressing can be used.
- the aqueous solvent as the slurry viscosity adjusting solvent is not particularly limited, and a conventionally known aqueous solvent can be used.
- a conventionally known aqueous solvent can be used.
- water pure water, ultrapure water, distilled water, ion exchange water, ground water, well water, tap water (tap water), etc.
- a mixed solvent of water and alcohol eg, ethyl alcohol, methyl alcohol, isopropyl alcohol, etc.
- Etc. eg, ethyl alcohol, methyl alcohol, isopropyl alcohol, etc.
- a conventionally well-known aqueous solvent can be selected suitably and used as long as the effect of this embodiment is not impaired.
- the blending amount of the aqueous solvent is not particularly limited, and an appropriate amount may be blended so that the negative electrode active material slurry is within a desired viscosity range.
- the basis weight when applying the negative electrode active material slurry to the current collector is not particularly limited, but is preferably 0.5 to 20 g / m 2 , more preferably 1 to 10 g / m 2 . If it is the said range, the negative electrode active material layer which has suitable thickness can be obtained.
- the coating method is not particularly limited, and examples thereof include a knife coater method, a gravure coater method, a screen printing method, a wire bar method, a die coater method, a reverse roll coater method, an ink jet method, a spray method, and a roll coater method.
- the method for drying the negative electrode active material slurry after coating is not particularly limited, and for example, a method such as warm air drying may be used.
- the drying temperature is, for example, 30 to 150 ° C.
- the drying time is, for example, 2 seconds to 50 hours.
- the thickness of the negative electrode active material layer thus obtained is not particularly limited as long as the ratio to the thickness of the high porosity layer described later is within a predetermined range, but is preferably 2 to 100 ⁇ m, for example. Is 3 to 30 ⁇ m.
- the density of the negative electrode active material layer is not particularly limited, but is preferably 1.4 to 1.6 g / cm 3 . If the density of the negative electrode active material layer is 1.6 g / cm 3 or less, the generated gas can easily escape from the electrode, and long-term cycle characteristics can be improved. Moreover, if the density of the negative electrode active material layer is 1.4 g / cm 3 or more, sufficient communication of the negative electrode active material can be obtained and high electron conductivity can be obtained, so that battery performance can be improved.
- the density of the negative electrode active material layer is preferably 1.42 to 1.53 g / cm 3 because the effects of the present invention are more exerted. Note that the density of the negative electrode active material layer represents the mass of the active material layer per unit volume.
- the electrode volume is obtained from the long side, the short side, and the height, and after measuring the weight of the active material layer, It can be determined by dividing weight by volume.
- the positive electrode active material layer contains a positive electrode active material and, if necessary, other materials such as a conductive additive, a binder, an electrolyte (polymer matrix, ion conductive polymer, electrolyte, etc.), a lithium salt for increasing ion conductivity, and the like. Further includes an additive.
- the positive electrode active material layer includes a positive electrode active material.
- the positive electrode active material include LiMn 2 O 4 , LiCoO 2 , LiNiO 2 , Li (Ni—Mn—Co) O 2, and lithium-- such as those in which some of these transition metals are substituted with other elements.
- Examples include transition metal composite oxides, lithium-transition metal phosphate compounds, and lithium-transition metal sulfate compounds.
- two or more positive electrode active materials may be used in combination.
- a lithium-transition metal composite oxide is used as the positive electrode active material.
- NMC composite oxide Li (Ni—Mn—Co) O 2 and those in which some of these transition metals are substituted with other elements (hereinafter also simply referred to as “NMC composite oxide”) are used.
- the NMC composite oxide has a layered crystal structure in which a lithium atomic layer and a transition metal (Mn, Ni, and Co are arranged in order) are stacked alternately via an oxygen atomic layer.
- One Li atom is contained, and the amount of Li that can be taken out is twice that of the spinel lithium manganese oxide, that is, the supply capacity is doubled, so that a high capacity can be obtained.
- the NMC composite oxide includes a composite oxide in which a part of the transition metal element is substituted with another metal element.
- Other elements in that case include Ti, Zr, Nb, W, P, Al, Mg, V, Ca, Sr, Cr, Fe, B, Ga, In, Si, Mo, Y, Sn, V, Cu , Ag, Zn, etc., preferably Ti, Zr, Nb, W, P, Al, Mg, V, Ca, Sr, Cr, more preferably Ti, Zr, P, Al, Mg, From the viewpoint of improving cycle characteristics, Ti, Zr, Al, Mg, and Cr are more preferable.
- a represents the atomic ratio of Li
- b represents the atomic ratio of Ni
- c represents the atomic ratio of Mn
- d represents the atomic ratio of Co
- x represents the atomic ratio of M. Represents. From the viewpoint of cycle characteristics, it is preferable that 0.4 ⁇ b ⁇ 0.6 in the general formula (1).
- the composition of each element can be measured by, for example, inductively coupled plasma (ICP) emission spectrometry.
- ICP inductively coupled plasma
- Ni nickel
- Co cobalt
- Mn manganese
- Ti or the like partially replaces the transition metal in the crystal lattice. From the viewpoint of cycle characteristics, it is preferable that a part of the transition element is substituted with another metal element, and it is particularly preferable that 0 ⁇ x ⁇ 0.3 in the general formula (1). Since at least one selected from the group consisting of Ti, Zr, Nb, W, P, Al, Mg, V, Ca, Sr, and Cr is dissolved, the crystal structure is stabilized. It is considered that the battery capacity can be prevented from decreasing even if the above is repeated, and that excellent cycle characteristics can be realized.
- b, c and d are 0.44 ⁇ b ⁇ 0.51, 0.27 ⁇ c ⁇ 0.31, 0.19 ⁇ d ⁇ 0.26. It is preferable that it is excellent in balance between capacity and durability.
- positive electrode active materials other than those described above may be used.
- the average particle diameter of the positive electrode active material contained in the positive electrode active material layer is not particularly limited, but is preferably 1 to 100 ⁇ m, more preferably 1 to 20 ⁇ m from the viewpoint of increasing the output.
- a binder used for a positive electrode active material layer For example, the following materials are mentioned. Polyethylene, polypropylene, polyethylene terephthalate (PET), polyether nitrile, polyacrylonitrile, polyimide, polyamide, cellulose, carboxymethyl cellulose (CMC) and its salts, ethylene-vinyl acetate copolymer, polyvinyl chloride, styrene-butadiene rubber (SBR) ), Isoprene rubber, butadiene rubber, ethylene / propylene rubber, ethylene / propylene / diene copolymer, styrene / butadiene / styrene block copolymer and hydrogenated product thereof, styrene / isoprene / styrene block copolymer and hydrogenated product thereof.
- Thermoplastic polymers such as products, polyvinylidene fluoride (PVdF), polyt
- the amount of the binder contained in the positive electrode active material layer is not particularly limited as long as it is an amount capable of binding the active material, but preferably 0.5 to 15% by mass with respect to the active material layer. More preferably, it is 1 to 10% by mass.
- additives other than the binder the same additives as those in the negative electrode active material layer column can be used.
- the separator has a function of holding an electrolyte and ensuring lithium ion conductivity between the positive electrode and the negative electrode, and a function as a partition wall between the positive electrode and the negative electrode.
- the present invention is generated by providing a high porosity layer having a specific porosity between the negative electrode active material layer and the separator and having a thickness within a predetermined range with respect to the thickness of the negative electrode active material layer. Improves gas escape. In order to further improve the gas discharge, it is necessary to consider the discharge of the gas that has passed through the negative electrode active material layer and reached the separator. From such a viewpoint, it is more preferable that the air permeability and the porosity of the separator are within an appropriate range.
- the air permeability (Gurley value) of the separator is preferably 200 (seconds / 100 cc) or less.
- the separator has an air permeability of 200 (seconds / 100 cc) or less, the escape of gas generated at the time of initial charge is improved, the battery has a good capacity retention rate after cycling, and a short circuit functioning as a separator. Prevention and mechanical properties are also sufficient.
- the lower limit of the air permeability is not particularly limited, but is usually 300 (seconds / 100) or more.
- the air permeability of the separator is a value according to the measurement method of JIS P8117 (2009).
- the porosity of the separator may be smaller than that of the high porosity layer described later, but is preferably 40 to 65%, more preferably 40% or more and less than 60%, and further preferably 40%. Above, it is less than 50%.
- the porosity of the separator is 40 to 65%, the escape of gas generated at the time of initial charge is improved, the battery has a good capacity maintenance rate after the cycle, and the function as a separator is prevented from being short-circuited. Mechanical properties are also sufficient.
- the porosity a value obtained as a volume ratio from the density of the resin as the raw material of the separator and the density of the separator of the final product is adopted. For example, when the density of the raw material resin is ⁇ and the bulk density of the separator is ⁇ ′, the porosity is expressed by 100 ⁇ (1 ⁇ ′ / ⁇ ).
- separator examples include a separator made of a porous sheet made of a polymer or fiber that absorbs and holds the electrolyte and a nonwoven fabric separator.
- a microporous (microporous film) can be used as the separator of the porous sheet made of polymer or fiber.
- the porous sheet made of the polymer or fiber include polyolefins such as polyethylene (PE) and polypropylene (PP); a laminate in which a plurality of these are laminated (for example, three layers of PP / PE / PP) And a microporous (microporous membrane) separator made of a hydrocarbon resin such as polyimide, aramid, polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP), glass fiber, and the like.
- PE polyethylene
- PP polypropylene
- a microporous (microporous membrane) separator made of a hydrocarbon resin such as polyimide, aramid, polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP), glass fiber, and the like.
- the thickness of the microporous (microporous membrane) separator cannot be uniquely defined because it varies depending on the intended use. For example, in applications such as secondary batteries for driving motors such as electric vehicles (EV), hybrid electric vehicles (HEV), and fuel cell vehicles (FCV), it is 4 to 60 ⁇ m in a single layer or multiple layers. Is desirable.
- the fine pore diameter of the microporous (microporous membrane) separator is desirably 1 ⁇ m or less (usually a pore diameter of about several tens of nm).
- nonwoven fabric separator cotton, rayon, acetate, nylon, polyester; polyolefins such as PP and PE; conventionally known ones such as polyimide and aramid are used alone or in combination.
- the bulk density of the nonwoven fabric is not particularly limited as long as sufficient battery characteristics can be obtained by the impregnated polymer gel electrolyte.
- the thickness of the nonwoven fabric separator may be the same as that of the electrolyte layer, and is preferably 5 to 200 ⁇ m, particularly preferably 10 to 100 ⁇ m.
- the nonaqueous electrolyte secondary battery of this embodiment includes a high porosity layer 16 between the negative electrode active material layer 13 and the separator 17.
- the high porosity layer 16 has a higher porosity than that of the separator 17, and the porosity of the high porosity layer 16 is 50 to 90%.
- the gas generated on the negative electrode surface during the first charge / discharge can move through the high pore layer 16, so that the gas can be easily discharged.
- the porosity of the high porosity layer 16 is lower than 50%, it is difficult to efficiently remove the gas because a sufficient gas flow path cannot be secured.
- the porosity exceeds 90%, it is difficult to obtain sufficient mechanical strength.
- the contact area with the negative electrode surface or separator which contacts a high porosity layer reduces, a high porosity layer becomes easy to peel.
- the porosity of the high porosity layer is more preferably 60 to 80%.
- the porosity of the high porosity layer is calculated from the basis weight and thickness change before and after the formation of the high porosity layer on the substrate, and the specific gravity of the high porosity layer.
- the ratio of the thickness of the high pore layer 16 to the thickness of the negative electrode active material layer 13 in the single battery layer is It is in the range of 0.01 to 0.4.
- the ratio of the thickness of the high porosity layer to the thickness of the negative electrode active material layer within the above range, the gas generated on the negative electrode surface can be efficiently discharged out of the power generation element, resulting in non-uniform film formation. Can be prevented.
- the ratio of the thickness of the high porosity layer to the thickness of the negative electrode active material layer is smaller than 0.01, the effect of the present invention for discharging the gas on the negative electrode surface cannot be sufficiently obtained.
- the ratio of the thickness of the high porosity layer to the thickness of the negative electrode active material layer exceeds 0.4, the ion permeability decreases and the output of the battery decreases.
- the ratio of the thickness of the high porosity layer to the thickness of the negative electrode active material layer is preferably 0.05 to 0.15.
- the material of the high porosity layer is not particularly limited as long as it has a function of holding an electrolyte and ensuring lithium ion conductivity between the positive electrode and the negative electrode and a function as a partition wall between the positive electrode and the negative electrode.
- it may be used that contains heat-resistant particles having a melting point or thermal softening point of 150 ° C. or higher, particularly 240 ° C. or higher.
- the heat-resistant particles have electrical insulation properties, are stable with respect to a solvent used in the production of an electrolytic solution and a high-porosity layer, and are electrochemically stable that are difficult to be oxidized and reduced within a battery operating voltage range. It is preferable that it is a thing.
- the heat-resistant particles may be organic particles or inorganic particles, but are preferably inorganic particles from the viewpoint of stability.
- the heat-resistant particles are preferably fine particles from the viewpoint of dispersibility, and fine particles having a secondary particle size of, for example, 100 nm to 4 ⁇ m, preferably 300 nm to 3 ⁇ m, more preferably 500 nm to 3 ⁇ m can be used.
- the shape of the heat-resistant particles is not particularly limited, and may be a nearly spherical shape, or may be a plate shape, a rod shape, or a needle shape.
- the inorganic particles (inorganic powder) having a melting point or thermal softening point of 150 ° C. or higher are not particularly limited, and examples thereof include iron oxide (FeO), SiO 2 , Al 2 O 3 , aluminosilicate (aluminosilicate), TiO 2.
- Inorganic oxides such as BaTiO 2 and ZrO 2 ; Inorganic nitrides such as aluminum nitride and silicon nitride; Slightly soluble ionic crystals such as calcium fluoride, barium fluoride and barium sulfate; Covalent crystals such as silicon and diamond Particles such as clay such as montmorillonite;
- the inorganic oxide may be a mineral resource-derived substance such as boehmite, zeolite, apatite, kaolin, mullite, spinel, olivine, mica, or an artificial product thereof.
- the inorganic particles include a surface of a conductive material exemplified by a metal; a conductive oxide such as SnO 2 or tin-indium oxide (ITO); a carbonaceous material such as carbon black or graphite; It may be a particle having electrical insulation properties by coating with an insulating material, for example, the above-described inorganic oxide.
- a conductive oxide such as SnO 2 or tin-indium oxide (ITO)
- a carbonaceous material such as carbon black or graphite
- It may be a particle having electrical insulation properties by coating with an insulating material, for example, the above-described inorganic oxide.
- the inorganic oxide particles can be easily coated on the negative electrode active material layer or the separator as a water-dispersed slurry, a high porosity layer can be produced by a simple method, which is preferable.
- Al 2 O 3 , SiO 2 and aluminosilicate (aluminosilicate) are
- Organic particles (organic powder) having a melting point or thermal softening point of 150 ° C. or higher include crosslinked polymethyl methacrylate, crosslinked polystyrene, crosslinked polydivinylbenzene, crosslinked styrene-divinylbenzene copolymer, polyimide, melamine resin, phenol
- crosslinked polymer particles such as resin, benzoguanamine-formaldehyde condensate, and organic resin particles such as heat-resistant polymer particles such as polysulfone, polyacrylonitrile, polyaramid, polyacetal, and thermoplastic polyimide.
- the organic resin (polymer) constituting these organic particles is a mixture, modified product, derivative, or copolymer (random copolymer, alternating copolymer, block copolymer, graft copolymer) of the materials exemplified above. Polymer) or a crosslinked product (in the case of the above-mentioned heat-resistant polymer fine particles).
- a highly porous layer mainly composed of a resin can be produced, so that a light battery as a whole can be obtained.
- grains may be used individually by 1 type, and may be used in combination of 2 or more types.
- the high pore layer preferably contains a binder.
- the binder has a role of bonding the heat-resistant particles. By the binder, a high pore layer is stably formed and peeling is prevented.
- the binder used for the high porosity layer is not particularly limited, and those skilled in the art can appropriately employ conventionally known binders.
- CMC carboxymethyl cellulose
- polyacrylonitrile cellulose
- cellulose ethylene-vinyl acetate copolymer
- polyvinyl chloride polyvinyl chloride
- SBR styrene-butadiene rubber
- PVdF polyvinylidene fluoride
- PVdF polytetrafluoroethylene
- PTFE polyvinyl fluoride
- PVDF polyvinylidene fluoride
- only 1 type may be used independently and 2 or more types may be used together.
- the content of the binder in the high porosity layer is preferably 2 to 20 mass% with respect to 100 mass% of the high porosity layer.
- the content of the binder is 2% by mass or more, the peel strength between the high pore layer and the separator can be increased, and the vibration resistance of the battery can be improved.
- the binder content is 20% by mass or less, the gaps between the heat-resistant particles are appropriately maintained, so that sufficient lithium ion conductivity can be ensured.
- the thickness of one layer of the high porosity layer is preferably 1 to 20 ⁇ m, more preferably 2 to 10 ⁇ m, and further preferably 3 to 7 ⁇ m.
- the thickness of the high porosity layer is in such a range, it is preferable because sufficient strength can be obtained and the bulk and weight of the high porosity layer itself does not become too large.
- the method for laminating the high porosity layer between the negative electrode active material layer and the separator is not particularly limited.
- a dispersion in which heat-resistant particles and, if necessary, a binder are dispersed in a solvent is prepared.
- the obtained dispersion is applied to (1) the surface of the negative electrode active material layer (one side or both sides of the negative electrode), and the solvent is dried to form a negative electrode having a high porosity layer on the surface.
- the separator is applied to one surface of the separator and the solvent is dried to form a separator having a high porosity layer on the surface.
- NMP N-methyl-2-pyrrolidone
- PVdF polyvinylidene fluoride
- the method for coating the dispersion on the surface of the negative electrode or separator is not particularly limited, for example, knife coater method, gravure coater method, screen printing method, Mayer bar method, die coater method, reverse roll coater method, inkjet method, Examples thereof include a spray method and a roll coater method.
- the temperature at which the solvent is removed is not particularly limited and can be appropriately set depending on the solvent used.
- the temperature is preferably 50 to 70 ° C.
- NMP is used as the solvent
- the temperature is preferably 70 to 90 ° C.
- the solvent may be dried under reduced pressure. Further, a part of the solvent may be left without being completely removed.
- a battery having a high porosity layer between the negative electrode active material layer and the separator obtained by sequentially laminating a separator and a positive electrode on the negative electrode having a high porosity layer on the surface of the negative electrode active material layer thus obtained.
- a separator having a high porosity layer on the surface is laminated so that the surface coated with the high porosity layer is on the negative electrode side, and a battery having a high porosity layer is produced between the negative electrode active material layer and the separator. can do.
- the single battery layer in the battery 10 shown in FIG. 1 can be configured by forming an electrolyte layer by holding the electrolyte in the separator (and the high pore layer).
- the electrolyte which comprises an electrolyte layer Polymer electrolytes, such as a liquid electrolyte and a polymer gel electrolyte, can be used suitably.
- the means for holding the electrolyte in the separator (and the high pore layer) is not particularly limited, and for example, means such as impregnation, coating, and spraying can be applied.
- the liquid electrolyte functions as a lithium ion carrier.
- the liquid electrolyte constituting the electrolytic solution layer has a form in which a lithium salt as a supporting salt is dissolved in an organic solvent as a plasticizer.
- organic solvent include carbonates such as ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), and ethyl methyl carbonate.
- EC ethylene carbonate
- PC propylene carbonate
- DMC dimethyl carbonate
- DEC diethyl carbonate
- ethyl methyl carbonate ethyl methyl carbonate.
- Li (CF 3 SO 2) 2 N Li (C 2 F 5 SO 2) 2 N, LiPF 6, LiBF 4, LiClO 4, LiAsF 6, LiTaF such 6, LiCF 3 SO 3
- a compound that can be added to the active material layer of the electrode can be similarly employed.
- the liquid electrolyte may further contain additives other than the components described above.
- additives include, for example, vinylene carbonate, methyl vinylene carbonate, dimethyl vinylene carbonate, phenyl vinylene carbonate, diphenyl vinylene carbonate, ethyl vinylene carbonate, diethyl vinylene carbonate, vinyl ethylene carbonate, 1,2-divinyl ethylene carbonate.
- vinylene carbonate, methyl vinylene carbonate, and vinyl ethylene carbonate are preferable, and vinylene carbonate and vinyl ethylene carbonate are more preferable.
- These cyclic carbonates may be used alone or in combination of two or more.
- a gel polymer electrolyte (gel electrolyte) containing an electrolytic solution can be preferably used.
- the gel polymer electrolyte has a configuration in which the above liquid electrolyte is injected into a matrix polymer (host polymer) made of an ion conductive polymer.
- a gel polymer electrolyte as the electrolyte is superior in that the fluidity of the electrolyte is lost and the ion conductivity between the layers is easily cut off.
- the ion conductive polymer used as the matrix polymer (host polymer) include polyethylene oxide (PEO), polypropylene oxide (PPO), and copolymers thereof. In such polyalkylene oxide polymers, electrolyte salts such as lithium salts can be well dissolved.
- the matrix polymer of gel electrolyte can express excellent mechanical strength by forming a crosslinked structure.
- thermal polymerization, ultraviolet polymerization, radiation polymerization, electron beam polymerization, etc. are performed on a polymerizable polymer (for example, PEO or PPO) for forming a polymer electrolyte using an appropriate polymerization initiator.
- a polymerization treatment may be performed.
- examples of the metal include aluminum, nickel, iron, stainless steel, titanium, copper, and other alloys.
- a clad material of nickel and aluminum, a clad material of copper and aluminum, or a plating material of a combination of these metals can be preferably used.
- covered on the metal surface may be sufficient.
- aluminum, stainless steel, and copper are preferable from the viewpoints of electronic conductivity and battery operating potential.
- the size of the current collector is determined according to the intended use of the battery. For example, if it is used for a large battery that requires a high energy density, a current collector having a large area is used. There is no particular limitation on the thickness of the current collector.
- the thickness of the current collector is usually about 1 to 100 ⁇ m.
- the material which comprises a current collector plate (25, 27) is not restrict
- a constituent material of the current collector plate for example, metal materials such as aluminum, copper, titanium, nickel, stainless steel (SUS), and alloys thereof are preferable. From the viewpoint of light weight, corrosion resistance, and high conductivity, aluminum and copper are more preferable, and aluminum is particularly preferable.
- the same material may be used for the positive electrode current collecting plate 27 and the negative electrode current collecting plate 25, and different materials may be used.
- the current collectors 11 and 12 and the current collector plates (25 and 27) may be electrically connected via a positive electrode lead or a negative electrode lead.
- a constituent material of the positive electrode and the negative electrode lead materials used in known lithium ion secondary batteries can be similarly employed.
- heat-shrinkable heat-shrinkable parts are removed from the exterior so that they do not affect products (for example, automobile parts, especially electronic devices) by touching peripheral devices or wiring and causing leakage. It is preferable to coat with a tube or the like.
- the battery outer case 29 a known metal can case can be used, and a bag-like case using a laminate film containing aluminum that can cover the power generation element can be used.
- a laminate film having a three-layer structure in which PP, aluminum, and nylon are laminated in this order can be used as the laminate film, but the laminate film is not limited thereto.
- a laminate film is desirable from the viewpoint that it is excellent in high output and cooling performance, and can be suitably used for a battery for large equipment for EV and HEV.
- the exterior body is more preferably an aluminate laminate.
- the inner volume of the exterior body is preferably larger than the volume of the power generation element.
- the internal volume of the exterior body refers to the volume in the exterior body before evacuation after sealing with the exterior body.
- the volume of the power generation element is a portion occupied by the power generation element in a spatial manner, and includes a hole in the power generation element. Since the inner volume of the exterior body is larger than the volume of the power generation element, there is a volume capable of storing gas when gas is generated. Therefore, the gas is smoothly discharged out of the system, and the generated gas hardly affects the battery behavior, and the battery characteristics are improved. In addition, when gas is generated, there is a surplus part that can store the gas in the exterior body, so that the volume of the power generation element can be kept constant. Can be sustained.
- the internal volume of the exterior body is preferably large to some extent so that gas can be stored. Specifically, the volume of the volume excluding the pores of the power generation element is 0.03 to 0.12, and the content of the exterior body The product is preferably larger than the power generation element.
- the effect of the present invention that efficiently discharges the generated gas to the outside is more effectively exhibited in the case of a large area battery with a large amount of gas generation. Therefore, in this invention, it is preferable in the meaning that the effect of this invention is exhibited more that the battery structure which covered the electric power generation element with the exterior body is large sized. Moreover, since it is easy to discharge
- the negative electrode active material layer is preferably rectangular, and the length of the short side of the rectangle is preferably 100 mm or more. Such a large battery can be used for vehicle applications.
- the length of the short side of the negative electrode active material layer refers to the side having the shortest length among the electrodes.
- the upper limit of the length of the short side of the battery structure is not particularly limited, but is usually 250 mm or less.
- the value of the ratio of the battery area to the rated capacity (the maximum value of the projected area of the battery including the battery outer casing) is 5 cm 2 / Ah or more, and the rated capacity is In a battery having a capacity of 3 Ah or more, since the battery area per unit capacity is large, the formation of a nonuniform coating (SEI) on the surface of the negative electrode active material is likely to be promoted.
- SEI nonuniform coating
- the nonaqueous electrolyte secondary battery according to the present embodiment is a battery having a large size as described above, because the merit due to the expression of the effects of the present invention is greater.
- the aspect ratio of the rectangular electrode is preferably 1 to 3, and more preferably 1 to 2. The electrode aspect ratio is defined as the aspect ratio of the rectangular positive electrode active material layer.
- the group pressure applied to the power generation element is preferably 0.07 to 0.7 kgf / cm 2 (6.86 to 68.6 kPa).
- the group pressure applied to the power generation element is 0.1 to 0.7 kgf / cm 2 (9.80 to 68.6 kPa).
- the group pressure refers to an external force applied to the power generation element, and the group pressure applied to the power generation element can be easily measured using a film-type pressure distribution measuring system. A value measured using a film-type pressure distribution measuring system is adopted.
- the control of the group pressure is not particularly limited, but can be controlled by applying an external force physically or directly to the power generation element and controlling the external force.
- a pressure member that applies pressure to the exterior body it is preferable to use. That is, a preferred embodiment of the present invention further includes a pressure member that applies pressure to the outer package so that the group pressure applied to the power generation element is 0.07 to 0.7 kgf / cm 2. It is a secondary battery.
- FIG. 2A is a plan view of a non-aqueous electrolyte secondary battery which is another preferred embodiment of the present invention
- FIG. 2B is a view as viewed from A in FIG. 2A.
- the exterior body 1 enclosing the power generation element has a rectangular flat shape, and an electrode tab 4 for taking out electric power is drawn out from the side portion.
- the power generation element is wrapped by a battery outer package, and the periphery thereof is heat-sealed.
- the power generation element is sealed with the electrode tab 4 pulled out.
- the power generation element corresponds to the power generation element 21 of the lithium ion secondary battery 10 shown in FIG. 1 described above.
- FIG. 1 the power generation element 21 of the lithium ion secondary battery 10 shown in FIG. 1 described above.
- the pressurizing member is disposed for the purpose of controlling the group pressure applied to the power generation element to be 0.07 to 0.7 kgf / cm 2 .
- the pressure member include rubber materials such as urethane rubber sheets, metal plates such as aluminum and SUS, and resin films such as PP.
- the pressure member can continuously apply a constant pressure to the power generation element, it is preferable to further include a fixing member for fixing the pressure member. Further, the group pressure applied to the power generation element can be easily controlled by adjusting the fixing of the fixing jig to the pressing member.
- the tab removal shown in FIG. 2 is not particularly limited.
- the positive electrode tab and the negative electrode tab may be pulled out from both sides, or the positive electrode tab and the negative electrode tab may be divided into a plurality of parts and taken out from each side. It is not a thing.
- said nonaqueous electrolyte secondary battery can be manufactured with a conventionally well-known manufacturing method.
- the assembled battery is configured by connecting a plurality of batteries. Specifically, at least two or more are used, and are configured by serialization, parallelization, or both. Capacitance and voltage can be freely adjusted by paralleling in series.
- a small assembled battery that can be attached and detached by connecting a plurality of batteries in series or in parallel. Then, a plurality of small assembled batteries that can be attached and detached are connected in series or in parallel to provide a large capacity and large capacity suitable for vehicle drive power supplies and auxiliary power supplies that require high volume energy density and high volume output density.
- An assembled battery having an output can also be formed. How many batteries are connected to make an assembled battery, and how many small assembled batteries are stacked to make a large-capacity assembled battery depends on the battery capacity of the mounted vehicle (electric vehicle) It may be determined according to the output.
- the non-aqueous electrolyte secondary battery or an assembled battery using the non-aqueous electrolyte battery has excellent output characteristics, maintains a discharge capacity even after long-term use, and has good cycle characteristics.
- Vehicle applications such as electric vehicles, hybrid electric vehicles, fuel cell vehicles, and hybrid fuel cell vehicles require higher capacity, larger size, and longer life than electric and portable electronic devices. . Therefore, the non-aqueous electrolyte secondary battery or the assembled battery using the non-aqueous electrolyte battery can be suitably used as a vehicle power source, for example, a vehicle driving power source or an auxiliary power source.
- a battery or an assembled battery formed by combining a plurality of these batteries can be mounted on the vehicle.
- a plug-in hybrid electric vehicle having a long EV travel distance or an electric vehicle having a long charge travel distance can be configured.
- a car a hybrid car, a fuel cell car, an electric car (four-wheeled vehicles (passenger cars, trucks, buses, commercial vehicles, light cars, etc.)
- the application is not limited to automobiles.
- it can be applied to various power sources for moving vehicles such as other vehicles, for example, trains, and power sources for mounting such as uninterruptible power supplies. It is also possible to use as.
- Examples 1 to 7> (Preparation of electrolyte) A mixed solvent (30:30:40 (volume ratio)) of ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) was used as a solvent. Further, 1.0M LiPF 6 was used as a lithium salt. Further, 2% by mass of vinylene carbonate was added to the total of 100% by mass of the solvent and the lithium salt to prepare an electrolytic solution. “1.0 M LiPF 6 ” means that the concentration of the supporting salt (LiPF 6 ) in the mixture of the mixed solvent and the supporting salt is 1.0 M.
- a solid content consisting of 85% by mass of LiMn 2 O 4 (average particle size: 15 ⁇ m) as a positive electrode active material, 5% by mass of acetylene black as a conductive assistant, and 10% by mass of PVdF as a binder was prepared.
- NMP N-methyl-2-pyrrolidone
- the positive electrode active material slurry is applied to both surfaces of an aluminum foil (20 ⁇ m) as a current collector, dried and pressed, and the coating amount on one side is 5, 10, 20, 25 mg / cm 2 , and the negative electrode active material on one side Positive electrodes having layer thicknesses of 60, 95, 170, and 210 ⁇ m were prepared.
- a solid content comprising 95% by mass of artificial graphite (average particle size: 20 ⁇ m) as a negative electrode active material, 2% by mass of acetylene black as a conductive additive, 2% by mass of SBR as a binder, and 1% by mass of CMC was prepared.
- An appropriate amount of ion-exchanged water as a slurry viscosity adjusting solvent was added to the solid content to prepare a negative electrode active material slurry.
- the negative electrode slurry was applied to both sides of a copper foil (15 ⁇ m) as a current collector, dried and pressed, and coated on one side (weight) 1.5, 6.0, 7.5 mg / cm 2 , one side Negative electrodes having thicknesses of 25, 95, and 115 ⁇ m were prepared.
- Each was produced. Specifically, 95 parts by mass of alumina particles (BET specific surface area 1 m 2 / g) and 5 parts by mass of polymethyl acrylate (acrylic binder) as a binder were prepared. Thereafter, this aqueous dispersion was applied to the surface of the negative electrode with a blade coater to obtain a high porosity layer.
- the positive electrode layer was cut into a 187 ⁇ 97 mm rectangular shape, and the negative electrode layer was cut into a 191 ⁇ 101 mm rectangular shape (15 positive electrode layers and 16 negative electrode layers).
- the ratio of the long side to the short side of the negative electrode active material layer serving as the electrode surface was 1.9.
- the positive electrode and the negative electrode were alternately laminated through a 195 ⁇ 103 mm separator (polyolefin microporous film, thickness 25 ⁇ m, porosity 45%).
- the rated capacities of the batteries thus fabricated were 6.3 Ah (Examples 5 and 6), 12.7 Ah (Example 7), 25.4 Ah (Examples 1 to 3), and 42.9 Ah (Examples), respectively.
- a tab was welded to each of the positive electrode and the negative electrode, and sealed together with the electrolyte in an exterior made of an aluminum laminate film.
- the unit cell was completed by sandwiching and pressurizing the battery with a urethane rubber sheet (thickness 3 mm) larger than the electrode area and further with an Al plate (thickness 5 mm).
- a 250 ⁇ 250 mm separator (polyolefin microporous membrane, thickness 25 ⁇ m, porosity 45%) was prepared.
- this aqueous dispersion was applied to one surface of the separator with a blade coater so that the high porosity layer had a thickness of 5 ⁇ m and the porosity was 50%, 70% or 90%.
- a layer was made.
- This positive electrode layer was cut into a 195 ⁇ 185 mm rectangular shape, and the negative electrode layer was cut into a 200 ⁇ 190 mm rectangular shape (15 positive electrode layers and 16 negative electrode layers).
- the separator with a high pore layer was cut into 203 mm ⁇ 193 mm.
- the ratio of the long side to the short side of the negative electrode active material layer serving as the electrode surface was 1.05.
- the positive electrode and the negative electrode were alternately laminated so that the surface on which the high pore layer was formed was on the negative electrode side through the separator having the high pore layer produced above.
- the rated capacities of the batteries thus produced are 21.5 Ah (Example 9), 121.2 Ah (Examples 10 and 12), and 173.5 Ah (Example 11), respectively. ratios, respectively 22.4 cm 2 / Ah (example 9), 4.0cm 2 / Ah (example 10 and 12) was 2.8 cm 2 / Ah (example 11).
- a tab was welded to each of the positive electrode and the negative electrode, and sealed together with the electrolyte in an exterior made of an aluminum laminate film.
- the unit cell was completed by sandwiching and pressurizing the battery with a urethane rubber sheet (thickness 3 mm) larger than the electrode area and further with an Al plate (thickness 5 mm).
- Batteries were produced in the same manner as in Examples 1 to 7, except that no high porosity layer was produced on the negative electrode.
- the positive electrode layer was cut into a 195 ⁇ 185 mm rectangular shape
- the negative electrode layer was cut into a 200 ⁇ 190 mm rectangular shape (15 positive electrode layers and 16 negative electrode layers)
- the length of the negative electrode active material layer The ratio of side to short side was 1.05.
- a 203 ⁇ 193 mm separator polyolefin microporous membrane, thickness 25 ⁇ m, porosity 45%
- the rated capacities of the batteries thus produced were 21.5 Ah (Comparative Example 1), 51.8 Ah (Comparative Example 2), 121.2 Ah (Comparative Examples 3 and 4), and 173.5 Ah (Comparative Example 5), respectively.
- the ratio of the battery area to the rated capacity is 22.4 cm 2 / Ah (Comparative Example 1), 9.3 cm 2 / Ah (Comparative Example 2), 4.0 cm 2 / Ah (Comparative Examples 3 and 4), respectively. It was 2.8 cm 2 / Ah (Comparative Example 5).
- a solid content comprising 92% by mass of artificial graphite (average particle size: 20 ⁇ m) as a negative electrode active material, 2% by mass of acetylene black as a conductive additive and 2% by mass of PVdF as a binder was prepared.
- NMP N-methyl-2-pyrrolidone
- the negative electrode slurry is applied to both sides of a copper foil (15 ⁇ m) as a current collector, dried and pressed, and the coating amount on one side (weight) is 1.5 or 6.0 mg / cm 2 , the negative electrode active material on one side A negative electrode having a layer thickness of 25 or 95 ⁇ m was produced.
- the positive electrode layer was cut into a 195 ⁇ 185 mm rectangular shape, and the negative electrode layer was cut into a 200 ⁇ 190 mm rectangular shape (15 positive electrode layers and 16 negative electrode layers).
- the ratio of the long side to the short side of the negative electrode active material layer was 1.05.
- a 203 ⁇ 193 mm separator polyolefin microporous membrane, thickness 25 ⁇ m, porosity 45% was used.
- Other conditions were the same as in Examples 1 to 7 above.
- the rated capacities of the batteries thus fabricated are 6.3 Ah (Comparative Example 6), 25.4 Ah (Comparative Example 7), and 121.2 Ah (Comparative Example 8), respectively, and the ratio of the battery area to the rated capacity is They were 42.3 cm 2 / Ah (Comparative Example 6), 10.6 cm 2 / Ah (Comparative Example 7), and 4.0 cm 2 / Ah (Comparative Example 8), respectively.
- Example 1 except that in Example 1 (formation of a high porosity layer on the negative electrode), a negative electrode having a high porosity layer coated with Al 2 O 3 so as to have a porosity of 45% was prepared. A battery was produced in the same manner as in Example 1.
- the rated capacity of the battery thus fabricated was 25.4 Ah, and the ratio of the battery area to the rated capacity was 10.6 cm 2 / Ah.
- Example 1 except that in Example 1 (formation of a high porosity layer on the negative electrode), a negative electrode having a high porosity layer in which Al 2 O 3 was applied so that the porosity was 95% was prepared. A battery was produced in the same manner as in Example 1.
- the rated capacity of the battery thus fabricated was 25.4 Ah, and the ratio of the battery area to the rated capacity was 10.6 cm 2 / Ah.
- Example 11 A battery was fabricated in the same manner as in Example 4 except that the thickness of the high porosity layer on the negative electrode was 1 ⁇ m.
- the rated capacity of the battery thus fabricated was 42.9 Ah, and the ratio of the battery area to the rated capacity was 6.3 cm 2 / Ah.
- ⁇ Battery evaluation> 1 First-time charging step of single battery
- CC constant current charge
- CV constant voltage
- the nonaqueous electrolyte secondary battery (unit cell) produced as described above was evaluated by ultrasonic measurement and charge / discharge performance test.
- the batteries of Examples 1 to 12 are higher in density than the batteries of Comparative Examples 1 to 5 and 9 to 11, and the gas is effectively discharged. It can also be seen that the capacity retention rate after a long-term cycle is high. Further, it was found that the battery density and cycle durability equal to or higher than those of the batteries of Comparative Examples 6 to 8 using PVdF as the organic solvent binder for the negative electrode active material layer were obtained.
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Abstract
Description
負極活物質層は、負極活物質を含む。負極活物質としては、例えば、グラファイト(黒鉛)、ソフトカーボン、ハードカーボン等の炭素材料、リチウム-遷移金属複合酸化物(例えば、Li4Ti5O12)、金属材料、リチウム合金系負極材料などが挙げられる。
場合によっては、2種以上の負極活物質が併用されてもよい。好ましくは、容量、出力特性の観点から、炭素材料またはリチウム-遷移金属複合酸化物が、負極活物質として用いられる。なお、上記以外の負極活物質が用いられてもよいことは勿論である。
正極活物質層は正極活物質を含み、必要に応じて、導電助剤、バインダー、電解質(ポリマーマトリックス、イオン伝導性ポリマー、電解液など)、イオン伝導性を高めるためのリチウム塩などのその他の添加剤をさらに含む。
セパレータは、電解質を保持して正極と負極との間のリチウムイオン伝導性を確保する機能、および正極と負極との間の隔壁としての機能を有する。
本実施形態の非水電解質二次電池は、負極活物質層13とセパレータ17との間に高空孔層16を備える。
本実施形態による電池は、セパレータ(および高空孔層)の部分に電解質を保持させて電解質層を形成することによって、図1に示す電池10における単電池層を構成することができる。電解質層を構成する電解質に特に制限はなく、液体電解質、ならびに高分子ゲル電解質等のポリマー電解質を適宜用いることができる。セパレータ(および高空孔層)の部分に電解質を保持させる手段は特に制限されず、例えば、含浸、塗布、スプレーなどの手段が適用されうる。
集電体を構成する材料に特に制限はないが、好適には金属が用いられる。
集電板(25、27)を構成する材料は、特に制限されず、リチウムイオン二次電池用の集電板として従来用いられている公知の高導電性材料が用いられうる。集電板の構成材料としては、例えば、アルミニウム、銅、チタン、ニッケル、ステンレス鋼(SUS)、これらの合金等の金属材料が好ましい。軽量、耐食性、高導電性の観点から、より好ましくはアルミニウム、銅であり、特に好ましくはアルミニウムである。なお、正極集電板27と負極集電板25とでは、同一の材料が用いられてもよいし、異なる材料が用いられてもよい。
また、図示は省略するが、集電体11、12と集電板(25、27)との間を正極リードや負極リードを介して電気的に接続してもよい。正極および負極リードの構成材料としては、公知のリチウムイオン二次電池において用いられる材料が同様に採用されうる。なお、外装から取り出された部分は、周辺機器や配線などに接触して漏電したりして製品(例えば、自動車部品、特に電子機器等)に影響を与えないように、耐熱絶縁性の熱収縮チューブなどにより被覆することが好ましい。
電池外装体29としては、公知の金属缶ケースを用いることができるほか、発電要素を覆うことができる、アルミニウムを含むラミネートフィルムを用いた袋状のケースが用いられうる。該ラミネートフィルムには、例えば、PP、アルミニウム、ナイロンをこの順に積層してなる3層構造のラミネートフィルム等を用いることができるが、これらに何ら制限されるものではない。高出力化や冷却性能に優れ、EV、HEV用の大型機器用電池に好適に利用することができるという観点から、ラミネートフィルムが望ましい。また、外部から掛かる発電要素への群圧を容易に調整することができ、所望の電解液層厚みへと調整容易であることから、外装体はアルミネートラミネートがより好ましい。
本発明において、発電要素に掛かる群圧は、0.07~0.7kgf/cm2(6.86~68.6kPa)であることが好ましい。群圧を0.07~0.7kgf/cm2となるように電池要素を加圧することで、ガスの系外への排出が向上し、また、電池中の余剰の電解液が電極間にあまり残らないので、セル抵抗の上昇を抑制することができる。さらに、電池の膨らみが抑制されてセル抵抗および長期サイクル後の容量維持率が良好となる。より好適には、発電要素に掛かる群圧が0.1~0.7kgf/cm2(9.80~68.6kPa)である。ここで、群圧とは、発電要素に付加された外力を指し、発電要素にかかる群圧は、フィルム式圧力分布計測システムを用いて容易に測定することができ、本明細書においてはtekscan社製フィルム式圧力分布計測システムを用いて測定する値を採用する。
組電池は、電池を複数個接続して構成した物である。詳しくは少なくとも2つ以上用いて、直列化あるいは並列化あるいはその両方で構成されるものである。直列、並列化することで容量および電圧を自由に調節することが可能になる。
上記非水電解質二次電池またはこれを用いた組電池は、出力特性に優れ、また長期使用しても放電容量が維持され、サイクル特性が良好である。電気自動車やハイブリッド電気自動車や燃料電池車やハイブリッド燃料電池自動車などの車両用途においては、電気・携帯電子機器用途と比較して、高容量、大型化が求められるとともに、長寿命化が必要となる。したがって、上記非水電解質二次電池またはこれを用いた組電池は、車両用の電源として、例えば、車両駆動用電源や補助電源に好適に利用することができる。
(電解液の作製)
エチレンカーボネート(EC)、エチルメチルカーボネート(EMC)、ジエチルカーボネート(DEC)の混合溶媒(30:30:40(体積比))を溶媒とした。また1.0MのLiPF6をリチウム塩とした。さらに上記溶媒と上記リチウム塩との合計100質量%に対して2質量%のビニレンカーボネートを添加して電解液を作製した。なお、「1.0MのLiPF6」とは、当該混合溶媒および支持塩の混合物における支持塩(LiPF6)濃度が1.0Mであるという意味である。
正極活物質としてLiMn2O4(平均粒子径:15μm)85質量%、導電助剤としてアセチレンブラック 5質量%、およびバインダーとしてPVdF 10質量%からなる固形分を用意した。この固形分に対し、スラリー粘度調整溶媒であるN-メチル-2-ピロリドン(NMP)を適量添加して、正極活物質スラリーを作製した。次に、正極活物質スラリーを、集電体であるアルミニウム箔(20μm)の両面に塗布し乾燥・プレスを行い、片面塗工量5、10、20、25mg/cm2、片面の負極活物質層の厚さが60、95、170、210μmの正極を作成した。
負極活物質として人造黒鉛(平均粒子径:20μm)95質量%、導電助剤としてアセチレンブラック2質量%およびバインダーとしてSBR2質量%、CMC1質量%からなる固形分を用意した。この固形分に対し、スラリー粘度調整溶媒であるイオン交換水を適量添加して、負極活物質スラリーを作製した。次に、負極スラリーを、集電体である銅箔(15μm)の両面に塗布し乾燥・プレスを行い片面塗工量(目付)1.5、6.0、7.5mg/cm2、片面の負極活物質層の厚さが25、95、115μmの負極を作製した。
上記で作製した負極に、表1のようにAl2O3を3、6、9μmの厚さで空孔率が50、70、90%になるように塗布した、高空孔層を有する負極をそれぞれ作製した。具体的には、アルミナ粒子(BET比表面積1m2/g)95質量部およびバインダーであるポリアクリル酸メチル(アクリル系バインダー)を5質量部のNMP分散体を調製した。その後、この水分散体をブレードコータにより負極の表面に塗布し、高空孔層を得た。
この正極層を187×97mmの長方形状に切断し、負極層を191×101mmの長方形状に切断した(正極層15枚、負極層16枚)。電極面となる負極活物質層の長辺と短辺との比は、1.9であった。この正極と負極を195×103mmのセパレータ(ポリオレフィン微多孔膜、厚さ25μm、空孔率45%)を介して交互に積層した。このように作製された電池の定格容量は、それぞれ6.3Ah(実施例5、6)、12.7Ah(実施例7)、25.4Ah(実施例1~3)、42.9Ah(実施例4)であり、定格容量に対する電池面積の比は、それぞれ42.3cm2/Ah(実施例5、6)、21.2cm2/Ah(実施例7)、10.6cm2/Ah(実施例1~3)、6.3cm2/Ah(実施例4)であった。
(電解液の作製)
上述の実施例1~7と同様の手順で行った。
上述の実施例1~7と同様の手順で行った。
上述の実施例1~7と同様の手順で行った。
負極上に高空孔層を形成する代わりに、セパレータ上にアルミナを含む高空孔層を形成した。
この正極層を195×185mmの長方形状に切断し、負極層を200×190mmの長方形状に切断した(正極層15枚、負極層16枚)。高空孔層付セパレータを203mm×193mmに切断した。電極面となる負極活物質層の長辺と短辺との比は、1.05であった。この正極と負極を、上記で作製した高空孔層を有するセパレータを介して、高空孔層を形成した面が負極側になるように交互に積層した。このように作製された電池の定格容量は、それぞれ21.5Ah(実施例9)、121.2Ah(実施例10、12)、173.5Ah(実施例11)であり、定格容量に対する電池面積の比は、それぞれ22.4cm2/Ah(実施例9)、4.0cm2/Ah(実施例10、12)、2.8cm2/Ah(実施例11)であった。
負極上に高空孔層を作製しなかったことを除いては、実施例1~7と同様にして電池を作製した。ただし、比較例4では、正極層を195×185mmの長方形状に切断し、負極層を200×190mmの長方形状に切断し(正極層15枚、負極層16枚)、負極活物質層の長辺と短辺との比は1.05であった。また、203×193mmのセパレータ(ポリオレフィン微多孔膜、厚さ25μm、空孔率45%)を用いた。
(電解液の作製)
上述の実施例1~7と同様の手順で行った。
上述の実施例1~7と同様の手順で行った。
負極活物質として人造黒鉛(平均粒子径:20μm)92質量%、導電助剤としてアセチレンブラック2質量%およびバインダーとしてPVdF 2質量%からなる固形分を用意した。この固形分に対し、スラリー粘度調整溶媒であるN-メチル-2-ピロリドン(NMP)を適量添加して、負極スラリーを作製した。次に、負極スラリーを、集電体である銅箔(15μm)の両面に塗布し乾燥・プレスを行い片面塗工量(目付)1.5または6.0mg/cm2、片面の負極活物質層の厚さが25または95μmの負極を作製した。
比較例6、7では、実施例1~7と同様に、正極層を187×97mmの長方形状に切断し、負極層を191×101mmの長方形状に切断した(正極層15枚、負極層16枚)。負極活物質層の長辺と短辺との比は、1.9であった。この正極と負極を195×103mmのセパレータ(ポリオレフィン微多孔膜、厚さ25μm、空孔率45%)を介して交互に積層した。
実施例1の(負極上の高空孔層の形成)において、Al2O3を空孔率が45%になるように塗布した高空孔層を有する負極を作製したことを除いては、実施例1と同様にして電池を作製した。
実施例1の(負極上の高空孔層の形成)において、Al2O3を空孔率が95%になるように塗布した高空孔層を有する負極を作製したことを除いては、実施例1と同様にして電池を作製した。
負極上の高空孔層の厚さを1μmに形成したことを除いては、実施例4と同様にして電池を作製した。
1.単電池の初回充電工程
上記のようにして作製した非水電解質二次電池(単電池)を充放電性能試験により評価した。この充放電性能試験は、25℃に保持した恒温槽において24時間保持し、初回充電を実施した。初回充電は、0.05CAの電流値で4.2Vまで定電流充電(CC)し、その後定電圧(CV)で、あわせて25時間充電した。その後、40℃に保持した恒温槽において96時間保持した。その後、25℃に保持した恒温槽において、1Cの電流レートで2.5Vまで放電を行い、その後に10分間の休止時間を設けた。
上記のようにして作製した非水電解質二次電池(単電池)を超音波測定および充放電性能試験により評価した。
初回充電後に超音波測定を行うことで発電要素中のガスを検査した。発電要素の密度を求め、比較例1の電池の密度を1とした場合の相対値として下記表1に示した。
充放電性能試験は、45℃に保持した恒温槽において、電池温度を45℃とした後、性能試験を行った。充電は1Cの電流レートで4.2Vまで定電流充電(CC)し、その後定電圧(CV)で、あわせて2.5時間充電した。その後、10分間休止時間を設けた後、1Cの電流レートで2.5Vまで放電を行い、その後に10分間の休止時間を設けた。これらを1サイクルとし、充放電試験を実施した。初回の放電容量に対して300サイクル後に放電した割合を容量維持率とした。結果を表1に示す。表1において、容量維持率は、比較例1の電池の容量維持率を100とした場合の相対値で表した。
2 加圧部材、
3 固定部材、
4 電極タブ、
10 リチウムイオン二次電池、
11 負極集電体、
12 正極集電体、
13 負極活物質層、
15 正極活物質層、
16 高空孔層、
17 セパレータ、
19 単電池層、
21 発電要素、
25 負極集電板、
27 正極集電板、
29 電池外装材。
Claims (8)
- 正極集電体の表面に正極活物質層が形成されてなる正極と、
負極集電体の表面に負極活物質層が形成されてなる負極と、
セパレータと、
を含む発電要素を有し、
前記負極活物質層が水系バインダーを含み、
前記負極活物質層と前記セパレータとの間に前記セパレータよりも高い空孔率を有する高空孔層を有し、前記高空孔層の空孔率が50~90%であり、
前記負極活物質層の厚さに対する前記高空孔層の厚さの比が0.01~0.4である、非水電解質二次電池。 - 前記高空孔層が、融点または熱軟化点が150℃以上である耐熱粒子を含む、請求項1に記載の非水電解質二次電池。
- 前記発電要素が外装体で密閉された構造であり、外装体の内容積が発電要素の容積よりも大きい、請求項1または2に記載の非水電解質二次電池。
- 前記負極活物質層が長方形状であり、前記長方形の短辺の長さが100mm以上である、請求項1~3のいずれか1項に記載の非水電解質二次電池。
- 定格容量に対する電池面積(電池外装体まで含めた電池の投影面積)の比が5cm2/Ah以上であり、かつ、定格容量が3Ah以上である、請求項1~4のいずれか1項に記載の非水電解質二次電池。
- 矩形状の正極活物質層の縦横比として定義される電極のアスペクト比が1~3である、請求項1~5のいずれか1項に記載の非水電解質二次電池。
- 前記水系バインダーは、スチレン-ブタジエンゴム、アクリロニトリル-ブタジエンゴム、メタクリル酸メチル-ブタジエンゴム、およびメタクリル酸メチルゴムからなる群から選択される少なくとも1つのゴム系バインダーを含む、請求項1~6のいずれか1項に記載の非水電解質二次電池。
- 前記水系バインダーは、スチレン-ブタジエンゴムを含む、請求項7に記載の非水電解質二次電池。
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EP14774455.1A EP2980911B1 (en) | 2013-03-26 | 2014-03-26 | Non-aqueous electrolyte secondary battery |
US14/780,326 US20160064715A1 (en) | 2013-03-26 | 2014-03-26 | Non-aqueous electrolyte secondary battery |
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JP2018152194A (ja) * | 2017-03-10 | 2018-09-27 | 株式会社東芝 | 二次電池 |
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CN115832194A (zh) * | 2022-10-14 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | 一种电池包和用电装置 |
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CN109314267B (zh) * | 2016-06-08 | 2019-11-26 | 远景Aesc日本有限公司 | 非水电解质二次电池 |
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- 2014-03-26 WO PCT/JP2014/058689 patent/WO2014157421A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
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KR101760198B1 (ko) | 2017-07-20 |
CN105103364A (zh) | 2015-11-25 |
CN105103364B (zh) | 2018-07-13 |
KR20150123897A (ko) | 2015-11-04 |
JPWO2014157421A1 (ja) | 2017-02-16 |
US20160064715A1 (en) | 2016-03-03 |
EP2980911A1 (en) | 2016-02-03 |
EP2980911B1 (en) | 2018-06-06 |
JP6076464B2 (ja) | 2017-02-08 |
EP2980911A4 (en) | 2017-01-18 |
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