WO2004102703A1 - 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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- WO2004102703A1 WO2004102703A1 PCT/JP2004/006869 JP2004006869W WO2004102703A1 WO 2004102703 A1 WO2004102703 A1 WO 2004102703A1 JP 2004006869 W JP2004006869 W JP 2004006869W WO 2004102703 A1 WO2004102703 A1 WO 2004102703A1
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- WIPO (PCT)
- Prior art keywords
- current collector
- negative electrode
- electrode plate
- positive electrode
- secondary battery
- Prior art date
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Classifications
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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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M2010/4292—Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode
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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
-
- 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
Definitions
- the present invention relates to a non-aqueous electrolyte secondary battery. More specifically, the present invention relates to, for example, a lithium ion secondary battery.
- the battery characteristics of non-aqueous electrolyte secondary batteries are determined by various factors.
- One of the factors that affect battery characteristics is the variation in internal battery resistance (internal resistance).
- the internal resistance is the resistance generated by the current collector, the active material, the electrolyte, etc. arranged inside the battery. If the variation of the internal resistance becomes large, the current distribution inside the battery becomes uneven, and there is a possibility that the battery characteristics (for example, charge and discharge cycle characteristics and high rate (charge rate) characteristics may be degraded. For this reason, it is required to suppress the variation in internal resistance as much as possible.
- Japanese Patent Laid-Open No. 10-261441 discloses a technique of providing a plurality of leads attached to a current collector in order to suppress variations in internal resistance.
- Japanese Patent Application Laid-Open No. 2000-21453 discloses a technique for reducing the thickness of the positive electrode active material as it is separated from the lead portion.
- Japanese Patent Application Laid-Open No. 10-261441 when the number of leads attached to the current collector is increased, the active material disposed on the current collector corresponding to the area to which the leads are attached The area of the layer must be reduced. This may reduce the capacity of the battery.
- the manufacturing process becomes more complicated because multiple leads are attached.
- Japanese Patent Application Laid-Open No. 2000-21453 when the thickness of the positive electrode active material layer is changed, the manufacturing process may be complicated and the manufacturing cost may be increased.
- the present invention relates to a non-aqueous electrolyte secondary battery having excellent battery characteristics represented by, for example, charge and discharge cycle characteristics and high rate charge and discharge characteristics by suppressing variation in internal resistance of the battery.
- the purpose is to provide Disclosure of the invention
- the non-aqueous electrolyte secondary battery of the present invention comprises an electrode plate group including a positive electrode plate, a negative electrode plate, and a separator, and a non-aqueous electrolyte, wherein the electrode plate group comprises the positive electrode plate and the negative electrode plate.
- the positive electrode plate has a shape obtained by laminating and winding through the separator, and the positive electrode plate includes a strip-shaped first current collector, and a positive electrode active material layer disposed on the first current collector.
- FIG. 1 is a cross-sectional view schematically showing an example of the non-aqueous electrolyte secondary battery of the present invention.
- FIGS. 2A to 2C are schematic equivalent circuit diagrams for explaining the variation of the internal resistance of the battery.
- FIG. 3A is a cross-sectional view schematically showing an example of a positive electrode plate used for the non-aqueous electrolyte secondary battery of the present invention.
- FIG. 3B is a plan view schematically showing an example of a positive electrode plate used for the non-aqueous electrolyte secondary battery of the present invention.
- FIG. 4A is a cross-sectional view schematically showing an example of a negative electrode plate used for the non-aqueous electrolyte secondary battery of the present invention.
- FIG. 4B is a plan view schematically showing an example of the negative electrode plate used for the non-aqueous electrolyte secondary battery of the present invention.
- the non-aqueous electrolyte secondary battery 20 shown in FIG. 1 (hereinafter simply referred to as “second battery 20” or “battery 20”) is an electrode plate including a positive electrode plate 1, a negative electrode plate 3 and a separator 5. It is equipped with group 1 1 and a non-aqueous electrolyte (not shown). Both of the electrode group 11 and the non-aqueous electrolyte are housed inside the battery case 8.
- the electrode plate group 11 has a shape in which a positive electrode plate 1 and a negative electrode plate 3 are stacked via a separator 5 and wound.
- the positive electrode plate 1 includes a strip-shaped positive electrode current collector (first current collector), a positive electrode active material layer disposed on the positive electrode current collector, and a positive electrode lithium electrically connected to the positive electrode current collector.
- the negative electrode plate 3 includes a strip-shaped negative electrode current collector (second current collector) and a negative electrode active material layer disposed on the negative electrode current collector. And a negative electrode lead (second lead) 4 electrically connected to the negative electrode current collector 4. Specific configuration examples of the positive electrode plate 1 and the negative electrode plate 3 will be described later.
- the value of the ratio (R 2 / R 1) of the electric resistance value R 2 per unit may be in the range of 0.85 or more and 1.5 or less, and the value of the ratio is 0.9 or more and 1.14 or less. It is preferable to be in the range of
- the units R 1 and R 2 are values given by, for example, ⁇ cm.
- the electrical resistance values of the positive electrode current collector and the negative electrode current collector can be made substantially the same. Therefore, it is possible to suppress variations in internal resistance of the battery, and to obtain a secondary battery excellent in battery characteristics such as charge and discharge cycle characteristics and high rate charge and discharge characteristics.
- R 2 in the negative electrode current collector tends to be smaller than that of R 1 in the positive electrode current collector.
- a strip-shaped positive electrode current collector made of aluminum foil When the thickness and the width of the negative electrode current collector are the same as each other, the value of the ratio (R 2Z R 1) is about 0.63. This value can be determined from the volume resistance of aluminum (2. 7 X 1 0 6 ⁇ ⁇ cm) and the volume resistivity of copper (1. 7 X 1 0- 6 ⁇ ⁇ cm).
- FIG. 2A An equivalent circuit representing the resistance component when the conduction path inside the secondary battery is schematically divided into seven is shown in FIG. 2A.
- R p 1 to R p 7 reflect the resistance value of each portion of the positive electrode current collector 1 a.
- R nl to R n 7 indicate the resistance value of each part of the negative electrode current collector 3 a
- R s 1 to R s 7 indicate the respective electrolytes disposed between the positive electrode plate 1 and the negative electrode plate 3. It reflects the resistance value of the part.
- R p 1 to R p 7 all have the same value
- R n l to R n 7 all have the same value
- R s 1 to R s 7 all have the same value.
- the resistance value of the conductive path through the electrolyte resistance R s 1 is represented by the equation R nl + R s 1 + R p 1 + R p 2 + R p 3 + R p 4 as shown in FIG. 2B. It is approximated by + R p 5 + R p 6 + R p 7, ie by the formula R nl + R sl + 7 XR pl. Also, as shown in FIG.
- the resistance per unit length in the longitudinal direction of the positive electrode current collector is greater than the resistance per unit length in the longitudinal direction of the negative electrode collector. If the value R 2 is smaller, then (resistance of the conductive path through R s 1)> (resistance of the conductive path through R s 7). Expressing in more detail including the conduction path through R s 2 to R s 6 (resistance of conduction path through R s 1)> (resistance of conduction path through R s 2)> (R s Resistance of the conduction path through 3)> ⁇ ⁇ ⁇ > (Conduction through R s 6 Resistance of the electrical path)> (resistance of the conductive path via R s 7).
- FIG. 2A when the positive electrode lead and the negative electrode lead are disposed on the respective electrode plates so as to be most distant from each other (for example, as shown in FIG. 1, the positive electrode lead 2 is in the electrode plate group 11).
- the negative electrode lead 4 is disposed at the outer peripheral portion of the electrode assembly 11 in the core portion.
- the variation in internal resistance due to the conductive path is expected to be larger. Even in such a case, variation in internal resistance of the battery can be suppressed by setting the ratio of R 2 to R 1 (R 2 / R 1) in the above-mentioned range.
- the positive electrode lead 2 is attached to the positive electrode plate 1 (positive electrode plate 1 positioned at the innermost periphery in the electrode plate group 11) of the core portion (unwound core portion) of the electrode plate group 11. Is arranged. More specifically, the positive electrode lead 2 is electrically connected to the end of the positive electrode plate 1 located at the core of the electrode plate group 11. Also, The negative electrode lead 4 is disposed on the negative electrode plate 3 (the negative electrode plate 3 located at the outermost periphery of the electrode plate group 11) in the outer peripheral portion of the electrode plate group 11. More specifically, the negative electrode lead 4 is electrically connected to the end of the negative electrode plate 3 located on the outer peripheral portion of the electrode plate group 11.
- the positive electrode lead 2 is connected to the positive electrode plate 1 (the positive electrode plate 1 positioned on the outermost periphery of the electrode plate group 11) at the outer peripheral portion of the electrode plate group 11, the negative electrode lead 4 is connected to the electrode plate group 11 It may be disposed on the core negative electrode plate 3 (the negative electrode plate 3 located at the innermost periphery in the electrode plate group 11).
- FIG. 3A, FIG. 3B, FIG. 4A and FIG. 4B Examples of the positive electrode plate 1 and the negative electrode plate 3 which realize such a configuration are shown in FIG. 3A, FIG. 3B, FIG. 4A and FIG. 4B.
- 3A and 4A are cross-sectional views
- FIGS. 3B and 4B are plan views.
- the positive electrode plate 1 includes a strip-shaped positive electrode current collector 1a and an active material layer (positive electrode active material layer) 1b formed on both sides of the positive electrode current collector 1a.
- the positive electrode lead 2 is electrically connected to one end of the positive electrode current collector 1 a in the longitudinal direction.
- the negative electrode plate 3 includes a strip-like negative electrode current collector 3a and active material layers (negative electrode active material layers) 3b formed on both sides thereof.
- the negative electrode lead 4 is electrically connected to one end of the negative electrode current collector 3 a in the longitudinal direction.
- the width of the positive electrode current collector la (the width in the short direction) and the width of the negative electrode current collector 3 a (the width in the short direction) are substantially the same.
- Such a positive electrode plate 1 and a negative electrode plate 3 are stacked via a separator so that the positive electrode lead 2 and the negative electrode lead 4 are farthest from each other, and are rolled up. It can be one.
- FIG. 3A to 4B schematically show an example of the positive electrode plate 1 and the negative electrode plate 3, and the positive electrode plate and the negative electrode plate used in the secondary battery of the present invention are as shown in FIG. 3A to FIG. It is not limited to the example shown to 4B.
- the positive electrode current collector la length The positive electrode lead 2 may be disposed at any place in the manual direction. The same applies to the relationship between the negative electrode current collector 3 a and the negative electrode lead 4.
- the positive electrode lead 2 may not be disposed in the core portion or the outer peripheral portion, or the negative electrode lead 4 may not be disposed in the core portion or the outer peripheral portion. It is also good.
- the value of the ratio (R 2 / R 1) changes the thickness of the current collector, and / or the material and material of the current collector (for example, the type or composition of the elements constituting the current collector), etc. Can be controlled by For example, the materials used between the positive electrode current collector and the negative electrode current collector are generally different from each other because the potentials (electrochemical potentials) that can be taken by the electrode plates are different.
- the electrical resistivity (for example, volume resistivity) of the material used for the positive electrode current collector is different from the electrical resistivity of the material used for the negative electrode current collector, for example, the positive electrode current collector
- the thickness of the current collector and the thickness of the negative electrode current collector may be different from each other (specifically, for example, the thickness of the current collector using a material having a relatively large volume resistivity is relatively small. It should be larger than the thickness of the current collector using the material). That is, the materials used for the positive electrode current collector and the negative electrode current collector may be different from each other, and the thickness of the positive electrode current collector may be different from the thickness of the negative electrode current collector.
- the electrical resistivity of the material used for the positive electrode current collector may be substantially the same as the electrical resistivity of the material used for the negative electrode current collector. Specific examples will be described later.
- the value of the ratio (R 2 // R 1) by changing the shape of the current collector.
- at least one current collector selected from the positive electrode current collector and the negative electrode current collector has pores, and the porosity of the positive electrode current collector and the porosity of the negative electrode current collector are mutually different. It may be different. More specifically, for example, the at least one current collector is It is sufficient to have a plurality of through holes. As the porosity is increased, the electrical resistance value of the current collector can be increased. In addition, the porosity of the current collector may be changed by laser processing, etching, or the like.
- the value of the ratio (R 2 ZR 1) satisfies the range of 0.8 or more and 1.5 or less (preferably 0.9 or more and 1.4 or less).
- at least one selected from the thickness of the positive electrode current collector and the thickness of the negative electrode current collector, the porosity, and the material (material) to be used may be controlled.
- 0 includes an upper insulating plate 6, a lower insulating plate 7, an insulating gasket 9, and a lid 10.
- the open end of battery case 8 is sealed with insulation gasket 9 and lid 10.
- the upper insulating plate 6 is disposed on the top of the plate group 11 in order to insulate the plate group 1 1 and the lid 10 from each other.
- the lower insulating plate 7 is disposed below the plate group 11 in order to insulate the plate group 1 1 and the battery case 8 from each other.
- the positive electrode lead 2 electrically connects the lid 10 serving as the positive electrode terminal and the positive electrode plate 1
- the negative electrode lead 4 electrically connects the battery case 8 serving as the negative electrode terminal and the negative electrode plate 3. ing. These members may be provided as needed.
- the type of the secondary battery 20 of the present invention is not particularly limited.
- various secondary batteries such as a lithium secondary battery and a nickel hydrogen battery may be used.
- the type of the secondary battery can be determined by selecting the types of the positive electrode active material used for the positive electrode plate 1, the negative electrode active material used for the negative electrode plate 3, and the non-aqueous electrolyte.
- the positive electrode active material layer 1 b and the negative electrode active material layer 3 b may each include a positive electrode active material and a negative electrode active material capable of reversibly absorbing and desorbing lithium, and the non-aqueous electrolyte may have lithium conductivity.
- the secondary battery 20 of the present invention can be a lithium secondary battery.
- each member included in the secondary battery of the present invention will be described by taking a lithium secondary battery as an example.
- the materials used for each member are not limited to the examples shown below, and materials generally used for secondary batteries may be used. However, depending on the type of secondary battery, it is necessary to select the material to be used.
- the positive electrode current collector la for example, aluminum may be used.
- the thickness of the positive electrode current collector is, for example, 1 0 ⁇ ! It is in the range of ⁇ 6 0 / X m.
- the thickness of the negative electrode current collector 3a is 0.56 times the thickness of the positive electrode current collector 1a to 0.5. It should be 7 7 times range.
- the value of the ratio (R 2 / R 1) can be in the range of 0.85 or more and 1.15 or less.
- the thickness of copper as the negative electrode current collector 3a with respect to the thickness of the aluminum current collector 1a is not limited to the range of 0.56 times to 0.77 times as described above, For example, the width, shape, etc. of each current collector may be adjusted arbitrarily.
- the value of the ratio (R 2 / R 1) should be within the range of 0.85 to 1.15.
- brass When aluminum is used as the positive electrode current collector 1 a, for example, brass may be used as the negative electrode current collector 3 a.
- Brass is an alloy containing copper and zinc, and the electrical resistance value can be changed by changing the composition ratio of zinc. Specifically, for example, by setting the zinc content in brass in the range of about 5 atomic% to 7 atomic%, it is possible to obtain brass having an electric resistance value substantially the same as the electric resistance value of aluminum aluminum. it can . That is, by using brass of the above composition as the negative electrode current collector 3a, the ratio of the thickness of the positive electrode current collector 1a to the thickness of the negative electrode current collector 3a is almost the same. The value of) can be in the above mentioned range.
- the value of the ratio (R 2 R 1) is set to 0.85 or more and 1.15 or less (by adjusting the material and thickness used for the current collector). Preferably, it should be in the range of 0.90 to 1.14).
- the constitution, structure and the like of the positive electrode active material layer lb are not particularly limited as long as the positive electrode active material layer lb contains a positive electrode active material capable of reversibly absorbing and desorbing lithium.
- a positive electrode active material layer used in a general lithium secondary battery.
- the material used for the positive electrode active material is not particularly limited as long as it can occlude and release lithium reversibly, and for example, lithium cobaltate (LiCoO 2 ) may be used.
- lithium-transition metal compounds containing lithium ions as guest ions may be used.
- lithium-transition metal compound for example, a composite oxide of lithium and at least one transition metal selected from cobalt, manganese, nickel, chromium, iron and vanadium may be used.
- a composite oxide of lithium and at least one transition metal selected from cobalt, manganese, nickel, chromium, iron and vanadium may be used.
- the structure, structure, and the like of the negative electrode active material layer 3 b are not particularly limited as long as the negative electrode active material layer 3 b includes a negative electrode active material capable of reversibly absorbing and desorbing lithium.
- the negative electrode active material layer 3 b may be a negative electrode active material layer used for a general lithium secondary battery.
- the material used for the negative electrode active material is not particularly limited as long as it can occlude and release lithium reversibly, for example, a carbon material, more specifically, for example, a carbon material obtained by firing Cotas or pitch, Graphite such as artificial graphite and natural graphite may be used.
- the shape of the negative electrode active material is preferably spherical, flaky or massive.
- the negative electrode active material in addition to the above-mentioned carbon material, for example, an alloy containing silicon, a silicon compound, tin, zinc or the like may be used.
- the separator 5 can maintain the electrical insulation between the positive electrode plate 1 and the negative electrode plate 3 and can hold the non-aqueous electrolyte having lithium conductivity, the structure, material used, etc. It is not particularly limited.
- a separator used for a general lithium secondary battery may be used.
- a microporous polyolefin resin containing polyethylene resin, polypropylene resin and the like may be used.
- the thickness of the separator 5 is, for example, in the range of 15 ⁇ to 30 ⁇ m.
- the non-aqueous electrolyte is not particularly limited as long as it has lithium conductivity.
- a non-aqueous electrolyte having lithium conductivity may be used.
- an electrolyte obtained by dissolving an electrolyte containing lithium in a non-aqueous solvent may be used.
- non-aqueous solvent for example, carbonates such as ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, jetyl carbonate and the like, or ⁇ -butyrolatan, 1,2-dimethoxetane, 1,2-dichloroethane, 1, 3-Dimethyoxypropane, 4-Methole-2-ylpentanone, 1, 4-Dioxane, Acetotrinole, Propioditrinole, Butyronitrinole, Norellonitrinole, Benzonitrinole, Snorolephoran, 3-Methinorace Norephora, Tetrahydriflophane, 2 -Methyl tetrahydrofuran, dimethyl formamide, dimethyl sulfoxide, dimethyl formamide, trimethyl phosphate, triethyl phosphate etc. may be used. Two or more of the non-aqueous solvents described above may be mixed and used.
- a lithium salt having a high electron-withdrawing property may be used for the electrolyte to be dissolved in the non-aqueous solvent.
- a lithium salt having a high electron-withdrawing property for example, L i PF 6 , L i BF 4 , L i C L O 4 , L i A s F L i CF 3 S 0 3 , L i N (SO 2 CF 3 ) 2 , L i N (SO 2 C 2 F 5 ) 2 , Li c (SO 2 CF 3 ) 3 or the like may be used. Just do it.
- Two or more of the electrolytes described above may be combined and dissolved in a non-aqueous solvent.
- the concentration of the electrolyte in the non-aqueous solvent is not particularly limited, and may be, for example, in the range of 0.50 mo 1/1 to 1 .5 mo 1 1.
- the manufacturing method of the secondary battery of this invention is shown.
- the manufacturing method described below is merely an example, and it is possible to manufacture the secondary battery of the present invention, for example, using a general method for manufacturing a secondary battery.
- a negative electrode active material and a binder are dispersed in an organic solvent and kneaded to prepare a negative electrode paste.
- the prepared negative electrode paste is applied to the surface of a strip-like negative electrode current collector and dried, and then the obtained sheet is rolled to obtain the surface of the negative electrode current collector (even on one side or both sides
- the negative electrode plate 3 having the negative electrode active material layer formed thereon can be obtained.
- the rolling process may be omitted.
- the electrical resistance value R 2 per unit length in the longitudinal direction of the negative electrode current collector and the electrical resistance value R 1 per unit length in the longitudinal direction of the positive electrode current collector described later in the method of manufacturing the positive electrode plate The value of the ratio (R 2 / R 1) with respect to is preferably in the range of 0.85 or more and 1.55 or less (preferably 0.9 or more and 1.14 or less).
- a carbon material for example, a carbon material obtained by firing an organic polymer compound (for example, phenol resin, polyacrylonitrile, cellulose etc.) may be prepared.
- the carbon material and the fluorine-based binder are kneaded in an organic solvent to prepare a paste.
- a fluorine-based binder for example, a fluorine-based binder may be used.
- at least one material selected from binders other than fluorine-based materials for example, acrylic rubber, modified acrylic rubber, styrene-butadiene rubber (SBR), acrylic polymers and bule-based polymers is used. You may use.
- Copolymers of the following may be used.
- the fluorine-based binder for example, polyvinylidene fluoride, a copolymer of vinylidene fluoride and propylene hexafluoride, or polytetrafluoroethylene resin may be used.
- the above-mentioned binder is usually used in the form of a dispersion (Dispersion).
- a conductive additive or thickener may be added to the negative electrode paste, if necessary.
- the conductive aid for example, at least one material selected from acetylene black, graphite and carbon fiber may be used.
- the thickening agent for example, at least one material selected from ethylene-vinyl alcohol copolymer, carboxymethylcellulose and methylcellulose may be used.
- a solvent capable of dispersing the binder for example, a solvent capable of dispersing the binder may be used.
- an organic binder for example, N-methyl-2-pyrrolidone (NMP), N, N-dimethylforamide (DMF), tetrahydrofuran (THF), dimethylacetamide
- NMP N-methyl-2-pyrrolidone
- DMF N-dimethylforamide
- THF tetrahydrofuran
- dimethylacetamide At least one organic solvent selected from dimethylsulfoxide, hexamethylsulfoamide, tetramethylurea, anaceton and methyl ethyl ketone may be used.
- water may be used as the solvent, for example.
- a planetary mixer, a homomixer, a pin mixer, a kneader, a homogenizer and the like may be used, and a plurality of these may be used in combination.
- a dispersant, a surfactant, a stabilizer and the like may be added, if necessary.
- a negative electrode paste When a negative electrode paste is applied to the surface of the negative electrode current collector, for example, a slit die coater, a single roll throat coater, a lip coater, a blade A coater, knife coater, gravure coater, dip coater or the like may be used. Drying after application is preferably drying in a state close to natural drying as much as possible, but in order to improve productivity, it is preferable that the temperature be in the range of 70 ° C. to 300 ° C. for about 1 minute to 5 hours. Drying may be performed in the range.
- a roll press may be used for rolling the negative electrode sheet coated with the negative electrode paste. Rolling may be performed, for example, until the negative electrode sheet reaches a target thickness. More specifically, for example, rolling may be performed several times at a constant linear pressure in a linear pressure range of about 1000 kg Z cm to 200 kg z cm, or a line in the above linear pressure range You can also roll while changing the pressure appropriately.
- the negative electrode plate 1 can be manufactured in the same manner as the negative electrode plate 3 by using a positive electrode active material instead of the negative electrode active material and a positive electrode current collector instead of the negative electrode current collector.
- the binder, the solvent, the conductive aid, the thickener, the stabilizer, the dispersant, the surfactant and the like may be the same as in the case of the negative electrode plate 3.
- the positive electrode lead 2 and the negative electrode lead 4 are attached to the positive electrode plate 1 and the negative electrode plate 3 produced as described above. Thereafter, the positive electrode plate 1 and the negative electrode plate 3 are stacked via the separator 5 and wound to produce a spirally wound electrode plate group 11.
- the positive electrode lead 2 and the lid 10 are electrically connected, and the negative electrode lead 4 and the bottom of the battery case 8 are electrically connected.
- a lower insulating plate 7 is disposed between the bottom of the battery case 8 and the electrode plate group 1 1, and an upper insulating plate 6 is disposed between the electrode plate group 1 1 and the lid 10.
- the battery case 8 is sealed with the insulating gasket 9 and the lid 10.
- the manufactured secondary battery is initially charged at a predetermined voltage after assembly. It will be.
- the high rate discharge characteristics were evaluated by the following method. First, charge at a constant current of 2000 mA (1 CmA) until the battery voltage reaches 4.2 V at room temperature, and then the current value decays to 10 0 mA (0.55 CmA). I was charged at a constant voltage. Next, the battery was discharged to a final discharge voltage of 3.0 V at a constant current of 400 mA (0.2 C mA), and the capacity X (mAh) discharged at that time was measured. Next, charge the battery at a constant current of 2000 mA (1 CmA) until the battery voltage reaches 4.2 V at room temperature, and then reduce the current value to 100 mA (0.55 CmA).
- the battery was charged at a constant voltage until it reached Next, the battery was discharged to a discharge termination voltage of 3.0 V at a constant current of 4000 mA (2 CmA), and the capacity Y (mA h) discharged at that time was measured.
- a discharge termination voltage of 3.0 V at a constant current of 4000 mA (2 CmA) the capacity Y (mA h) discharged at that time was measured.
- the capacity ratio (YZX * 100%) in mA) is expressed as an average value to obtain high-rate discharge characteristics.
- the charge and discharge cycle characteristics are as follows: 500 times of charge and discharge cycles at room temperature After return, it was evaluated by measuring the capacity retention rate of the battery. In the above charging and discharging cycle, charging is performed with a constant current of 20 O mA (l CmA) until the battery voltage reaches 4.2 V, and then the current value is reduced to 100 mA (0.55 CmA). It was done by charging with a constant voltage until The discharge was performed by discharging at a constant current of 2000 mA to a discharge termination voltage of 3.0 V. After repeating such charge / discharge cycles 500 times, the discharge capacity at 500 cycles was measured.
- the discharge capacity (initial discharge capacity) of the battery at the end of the third cycle was measured, and the discharge capacity after 500 cycles of the initial discharge capacity was 100% (discharge capacity at 500th cycle).
- the ratio (capacity maintenance rate) was calculated. The charge and discharge cycle characteristics were evaluated using the average value of the capacity retention rates obtained in this manner.
- Each battery sample was a cylindrical battery as shown in FIG.
- a negative electrode plate was produced using the following method.
- a graphite having a linear flake shape is prepared as a negative electrode active material, and 4 parts by weight (solid content) of a water-soluble dispersion of styrene butadiene rubber as a binder is prepared with 100 parts by weight of the above graphite.
- As a thickener 0.8 parts by weight of carboxymethylcellulose was added in the form of an aqueous solution, and this was further kneaded using a planetary mixer to prepare a negative electrode paste.
- the prepared negative electrode paste is applied to the surface of a negative electrode current collector made of strip copper foil (thickness 9 / xm) using a slit die coater and then dried, and then applied to the surface of the current collector.
- a negative electrode sheet (thickness 230 / im) having a negative electrode active material layer formed was produced.
- it was rolled three times at a linear pressure of 1 1 OK g / cm using a roll press machine to produce a negative electrode plate of 1 47 x m in thickness.
- the negative electrode current collection in the prepared negative electrode plate The negative electrode lead was spot welded to the end of the body (area where the copper foil was exposed).
- the positive electrode plate was produced using the following method.
- Lithium cobaltate is prepared as a positive electrode active material, and 3 parts by weight of acetylene black carbon powder as a conductive assistant and 100 parts by weight of the lithium cobaltate and polytetrafluro as a binder. 4 parts by weight (solid content) of dimethyl ethylene resin and 0.8 parts by weight of carboxymethylcellulose as a thickener were added in the form of an aqueous solution, and this was further kneaded using a planetary mixer. The positive electrode paste was prepared. Next, the prepared positive electrode paste is applied to the surface of a positive electrode current collector made of a strip of aluminum foil (14 m in thickness) using a slit die coater and then dried.
- a positive electrode sheet (thickness: 240 / xm) having a positive electrode active material layer formed on the surface was produced. Next, it was rolled three times at a linear pressure of 1000 Kg / cm using a roll press machine to produce a positive electrode plate of 143 m thick. Next, the positive electrode lead was spot-welded to the end of the positive electrode current collector (area where aluminum was exposed) in the produced positive electrode plate. Thereafter, it was further dried at 250 ° C. for 10 hours. The width of the positive electrode current collector and the width of the negative electrode current collector were substantially the same.
- the positive electrode plate and the negative electrode plate produced as described above were laminated via a polypropylene separator (thickness 20 / im) and wound spirally to produce an electrode plate group.
- a positive electrode lead was disposed at the core portion, and an electrode plate group was produced such that the negative electrode lead was disposed at the outer peripheral portion.
- the electrode plate group was accommodated in the battery case provided with the lower insulating plate at the bottom.
- the positive electrode lead was connected to the lid, and the negative electrode lead was connected to the bottom of the battery case.
- the upper insulating plate was disposed above the electrode plate group, and a predetermined amount of non-aqueous electrolyte was injected into the battery case.
- a battery was produced in the same manner as in Sample 1 except that the thickness of the negative electrode current collector was 6 ⁇ m (ratio to the thickness of the positive electrode current collector: 0.43), and the evaluation of the battery characteristics described above was carried out. went.
- the value of the ratio (R2 // R1) in sample A was 1.52.
- the battery characteristics were evaluated as described above with respect to sample A.
- the capacity rate at high rate discharge was 92.8%, and the capacity retention rate after 500 charge and discharge cycles was 74.9%. there were.
- a battery was produced in the same manner as in Sample 1 except that the thickness of the negative electrode current collector was 12 ⁇ (the ratio to the thickness of the positive electrode current collector: 0.86), and the evaluation of the above-described battery characteristics was carried out went.
- the value of the ratio (R 2 / R 1) in the sample ⁇ was 0.76.
- the thickness of the negative electrode current collector is 8 m (ratio to the thickness of the positive electrode current collector: 0.5 7
- a battery was produced in the same manner as in Sample 1 except that the battery characteristics were evaluated as described above.
- the value of the ratio (R 2 ZR 1) in sample 2 was 1.14.
- the battery characteristics were evaluated as described above with respect to sample 2.
- the capacity ratio at high rate discharge was 95. 1%, and the capacity maintenance ratio after 500 charge and discharge cycles was 79.7%. Met.
- One sample 3-A battery was manufactured in the same manner as in Sample 1 except that the thickness of the negative electrode current collector was 10 / m (ratio to the thickness of the positive electrode current collector: 0.71), and the above-described battery The characteristics were evaluated. The value of the ratio (R 2 / R 1) in sample 3 was 0.91. The battery characteristics were evaluated as described above with respect to sample 3. The capacity ratio at high rate discharge was 95.2%, and the capacity retention ratio after 500 charge and discharge cycles was 80.1%. The A battery was produced in the same manner as in Sample 1 except that a yellow copper foil (14 m in thickness) having a zinc content of 6 at% was used as the negative electrode current collector, and the above-described battery characteristics were evaluated.
- the value of the ratio (R 2 / R 1) in sample 4 was 0.98.
- the capacity ratio at high rate discharge was 96.0%, and the capacity retention ratio after 500 charge and discharge cycles was 80.3%. .
- a battery was produced in the same manner as in Sample 1 except that a yellow copper foil (14 ⁇ m thick) having a zinc content of 10 at% was used as the negative electrode current collector, and the evaluation of the above-mentioned battery characteristics was carried out. went.
- the value of the ratio (R 2 / R 1) in sample C was 1.47.
- the capacity rate at high rate discharge was 93.3%
- the capacity retention rate after 500 charge and discharge cycles was 76.2%.
- a battery was produced in the same manner as in Sample 1 except that a yellow copper foil (14 ⁇ m in thickness) having a zinc content of 2 at% was used as the negative electrode current collector, and the above-described battery characteristics were evaluated. .
- the value of the ratio (R 2ZR 1) in sample D was 0.73.
- Example 5-A battery was prepared in the same manner as in Sample 1 except that a yellow copper foil (thickness 14 ⁇ ⁇ ) having a zinc content of 5 at ° / 0 was used for the negative electrode current collector, and the battery characteristics described above
- the evaluation of The value of the ratio (R 2 / R 1) in sample 5 was 0.90.
- the capacity ratio at high rate discharge was 95.9%, and the capacity retention ratio after 500 charge and discharge cycles was 79.7%.
- Example 6-A battery was prepared in the same manner as in Sample 1 except that a yellow copper foil (thickness 14 ⁇ ) containing 7 at% of zinc was used for the negative electrode current collector. I made an evaluation.
- the value of the ratio (R 2 ZR 1) in sample 6 was 1.07. Evaluation of the battery characteristics described above with respect to sample 6 shows that the capacity ratio at high rate discharge is 95.6%, and the capacity retention ratio after 500 charge and discharge cycles is 79.8%. there were.
- the ratio of the electrical resistance value R 2 per unit length in the longitudinal direction of the negative electrode current collector to the electrical resistance value R 1 per unit length in the longitudinal direction of the positive electrode current collector (R 2 ZR 1 Sample 1 to sample 6 in which the value of) is in the range of 0.85 or more and 1.15 or less range of the ratio (R 2 / R 1) is in the range of 0.85 or more and 1.15 or less.
- a non-aqueous electrolyte secondary that is excellent in battery characteristics represented by, for example, charge / discharge cycle characteristics, high rate charge / discharge characteristics, etc. Can provide a battery.
Abstract
Description
Claims
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100986876B1 (ko) * | 2007-03-27 | 2010-10-08 | 가부시끼가이샤 도시바 | 비수전해질 전지, 전지 팩 및 자동차 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0536401A (ja) * | 1991-07-30 | 1993-02-12 | Japan Storage Battery Co Ltd | リチウム二次電池 |
JPH0822841A (ja) * | 1994-04-21 | 1996-01-23 | Haibaru:Kk | 二次電池 |
JPH08236115A (ja) * | 1995-02-28 | 1996-09-13 | Haibaru:Kk | 二次電池 |
JPH09102301A (ja) * | 1995-10-05 | 1997-04-15 | Kanebo Ltd | 有機電解質電池 |
JPH10199574A (ja) * | 1996-12-28 | 1998-07-31 | Japan Storage Battery Co Ltd | 非水電解液電池 |
JP2002042889A (ja) * | 2000-07-21 | 2002-02-08 | Toshiba Corp | 非水電解質二次電池 |
-
2004
- 2004-05-14 WO PCT/JP2004/006869 patent/WO2004102703A1/ja active Application Filing
- 2004-05-14 JP JP2005506258A patent/JPWO2004102703A1/ja not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0536401A (ja) * | 1991-07-30 | 1993-02-12 | Japan Storage Battery Co Ltd | リチウム二次電池 |
JPH0822841A (ja) * | 1994-04-21 | 1996-01-23 | Haibaru:Kk | 二次電池 |
JPH08236115A (ja) * | 1995-02-28 | 1996-09-13 | Haibaru:Kk | 二次電池 |
JPH09102301A (ja) * | 1995-10-05 | 1997-04-15 | Kanebo Ltd | 有機電解質電池 |
JPH10199574A (ja) * | 1996-12-28 | 1998-07-31 | Japan Storage Battery Co Ltd | 非水電解液電池 |
JP2002042889A (ja) * | 2000-07-21 | 2002-02-08 | Toshiba Corp | 非水電解質二次電池 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100986876B1 (ko) * | 2007-03-27 | 2010-10-08 | 가부시끼가이샤 도시바 | 비수전해질 전지, 전지 팩 및 자동차 |
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