WO2022145107A1 - 非水電解質二次電池用負極、その製造方法およびその検査方法、並びに非水電解質二次電池およびその製造方法 - Google Patents
非水電解質二次電池用負極、その製造方法およびその検査方法、並びに非水電解質二次電池およびその製造方法 Download PDFInfo
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- WO2022145107A1 WO2022145107A1 PCT/JP2021/038237 JP2021038237W WO2022145107A1 WO 2022145107 A1 WO2022145107 A1 WO 2022145107A1 JP 2021038237 W JP2021038237 W JP 2021038237W WO 2022145107 A1 WO2022145107 A1 WO 2022145107A1
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- negative electrode
- aqueous electrolyte
- electrolyte secondary
- secondary battery
- mixture layer
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Images
Classifications
-
- 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
-
- 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
- H01M4/139—Processes of manufacture
-
- 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
-
- 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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
-
- 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
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
-
- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- 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
Definitions
- the present invention is for manufacturing a non-aqueous electrolyte secondary battery having excellent charge load characteristics and a method for manufacturing the same, a negative electrode capable of constituting the non-aqueous electrolyte secondary battery and a method for manufacturing the same, and a non-aqueous electrolyte secondary battery. It relates to a method for inspecting a negative electrode.
- Non-aqueous electrolyte secondary batteries are used in portable electronic devices such as mobile phones and notebook personal computers, and as power sources for electric vehicles.
- SDGs Sustainable Development Goals
- Goal 7 “Energy for everyone and cleanly”
- Goal 12 “Responsibility to create and use”.
- various characteristics have been improved with the diversification of its applications.
- One of the improvements in the characteristics required for non-aqueous electrolyte secondary batteries is to shorten the charging time.
- charging is performed at a constant current until the battery voltage reaches a predetermined value [constant current charging (CC charging)], and then the current value drops at a constant current to reach a predetermined value.
- CC charging constant current charging
- CV charging constant voltage charging
- the method of charging until it reaches [constant voltage charging (CV charging)] is common, but it is from the start of CC charging to the end voltage rather than the time from the start of CV charging to the end of the current value. Since the time is shorter, it is desirable that the amount of electricity that can be charged to the battery during CC charging is large from the viewpoint of shortening the charging time.
- Patent Document 1 an electrode active material layer containing an electrode active material, a conductive auxiliary agent, or the like is provided on at least one surface of the current collector layer. It has been proposed that the provided electrode for a lithium ion battery has a specific range of interfacial resistance between the electrode active material layer and the current collector layer.
- the present invention has been made in view of the above circumstances, and an object thereof is a non-aqueous electrolyte secondary battery having excellent charge load characteristics and a method for manufacturing the same, a negative electrode capable of constituting the non-aqueous electrolyte secondary battery and the negative electrode thereof. It is an object of the present invention to provide a manufacturing method and a method for inspecting a negative electrode for manufacturing a non-aqueous electrolyte secondary battery.
- the negative electrode for a non-aqueous electrolyte secondary battery has a negative electrode mixture layer containing a negative electrode active material on one or both sides of a current collector, and the negative electrode mixture layer and the current collector.
- the interface resistance between the body and the body is Rs ( ⁇ cm 2 )
- the volume resistance of the negative electrode mixture layer is ⁇ v ( ⁇ cm)
- the thickness of the negative electrode mixture layer is the same below.
- Rs / ( ⁇ v ⁇ d) is characterized by the following values.
- the negative electrode for a non-aqueous electrolyte secondary battery according to the second aspect of the present invention has a negative electrode mixture layer containing a negative electrode active material on one or both sides of a current collector, and the negative electrode mixture layer and the current collector.
- the interface resistance with the body is Rs ( ⁇ cm 2 ) and the thickness of the negative electrode mixture layer is d (cm)
- the relationship of Rs ⁇ 1.67d + b (where b is ⁇ 0.01 or more and 0 or less). It is characterized by satisfying.
- the non-aqueous electrolyte secondary battery of the present invention has a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte
- the negative electrode is for the non-aqueous electrolyte secondary battery of the present invention. It is characterized by being a negative electrode (the negative electrode of the first aspect or the negative electrode of the second aspect).
- the negative electrode when a negative electrode mixture layer containing a negative electrode active material is formed on one side or both sides of a current collector, the negative electrode is formed. It is characterized in that the thickness of the mixture layer and Rs / ( ⁇ v ⁇ d) are adjusted to the values of (A) or (B).
- the Rs It is characterized in that and d are adjusted so as to satisfy the relationship of Rs ⁇ 1.67d + b (where b is ⁇ 0.01 or more and 0 or less).
- the method for manufacturing a non-aqueous electrolyte secondary battery of the present invention comprises a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte secondary battery having a non-aqueous electrolyte.
- a negative electrode for a non-aqueous electrolyte secondary battery manufactured by the method for manufacturing a negative electrode for a non-aqueous electrolyte secondary battery of the present invention is used.
- the negative electrode mixture layer for a non-aqueous electrolyte secondary battery having the negative electrode mixture layer containing the negative electrode active material on one side or both sides of the current collector is provided with the negative electrode mixture layer and the current collector.
- the value of Rs / ( ⁇ v ⁇ d) was measured by measuring the interfacial resistance Rs ( ⁇ cm 2 ), the volume resistance ⁇ v ( ⁇ cm) of the negative electrode mixture layer, and the thickness d (cm) of the negative electrode mixture layer.
- a non-aqueous electrolyte secondary having a step of calculating the above and a step of selecting a non-aqueous electrolyte secondary battery to which the negative electrode for the non-aqueous electrolyte secondary battery is applied based on the value of Rs / ( ⁇ v ⁇ d).
- a method for inspecting the negative electrode for a battery is included.
- the negative electrode for a non-aqueous electrolyte secondary battery having a negative electrode mixture layer containing a negative electrode active material on one side or both sides of the current collector, the negative electrode mixture layer and the current collector Based on the step of measuring the interfacial resistance Rs ( ⁇ cm 2 ) between the two, and the thickness d (cm) of the negative electrode mixture layer, and the relationship between the Rs and d, the negative electrode for the non-aqueous electrolyte secondary battery. Also included is a method of inspecting a negative electrode for a non-aqueous electrolyte secondary battery, which comprises a step of selecting a non-aqueous electrolyte secondary battery to which the above is applied.
- a non-aqueous electrolyte secondary battery having excellent charge load characteristics and a manufacturing method thereof, a negative electrode capable of constituting the non-aqueous electrolyte secondary battery and a manufacturing method thereof, and a non-aqueous electrolyte secondary battery can be manufactured.
- a method for inspecting a negative electrode for this purpose can be provided.
- FIG. 1 is a cross-sectional view taken along the line II of FIG.
- the negative electrode for a non-aqueous electrolyte secondary battery (hereinafter, may be simply referred to as "negative electrode")> (Negative electrode of the first aspect)
- the negative electrode for a non-aqueous electrolyte secondary battery according to the first aspect of the present invention has a negative electrode mixture layer containing a negative electrode active material on one or both sides of a current collector, and the negative electrode mixture layer and the current collector.
- Rs product of volume resistance
- d thickness
- ratio of ⁇ v ⁇ d ratio of ⁇ v ⁇ d “Rs / ( ⁇ v ⁇ d) Is within a specific range as described below, depending on the thickness of the negative electrode
- the agent is not functioning efficiently as a component for ensuring the conductivity in the negative electrode mixture layer.
- the relationship between the resistance at the interface between the current collector and the mixture layer and the resistance of the mixture layer is within a certain range [for example, Rs / ( ⁇ v ⁇ d) is relatively close to 1] of the electrode.
- the more conductive negative electrode active material contained in the mixture layer of the electrode and the conductive auxiliary agent used as needed are components for ensuring the conductivity in the negative electrode mixture layer.
- the electron conduction to the current collector is better. Therefore, it is presumed that the charge load characteristic of the non-aqueous electrolyte secondary battery can be improved by adjusting the value of Rs / ( ⁇ v ⁇ d) of the negative electrode to a specific range.
- the value of Rs / ( ⁇ v ⁇ d) is essentially close to 1.0, but in an actual negative electrode, the value of Rs / ( ⁇ v ⁇ d) may be adjusted to around 1.0. It is extremely difficult, and by making this as close to 1.0 as possible, the charge load characteristics of the non-aqueous electrolyte secondary battery can be improved compared to the case where the value of Rs / ( ⁇ v ⁇ d) is extremely far from 1.0. It turns out that it can be enhanced.
- the thickness of the negative electrode mixture layer is 35 ⁇ m or more, depending on the value of Rs / ( ⁇ v ⁇ d) when the thickness of the negative electrode mixture layer is as thin as less than 35 ⁇ m. This is because the charge load characteristics of the battery tend to be higher.
- the negative electrode of the present invention is a step of applying a negative electrode mixture-containing composition in which a negative electrode active material or the like is dispersed in a solvent to a current collector.
- a negative electrode mixture-containing composition in which a negative electrode active material or the like is dispersed in a solvent to a current collector.
- Rs is actually 0.002 ⁇ cm 2 or more, and when it is 0.0025 ⁇ cm 2 or more, the production becomes easier.
- the Rs in the case of (A) is preferably 0.01 ⁇ cm 2 or less, more preferably 0.005 ⁇ cm 2 or less, and further preferably 0.003 ⁇ cm 2 or less.
- ⁇ v is preferably 0.02 ⁇ cm or more, more preferably 0.03 ⁇ cm or more, further preferably 0.04 ⁇ cm or more, and 0.5 ⁇ cm or less. It is preferably 0.2 ⁇ cm or less, more preferably 0.1 ⁇ cm or less, and further preferably 0.1 ⁇ cm or less.
- Rs is actually 0.002 ⁇ cm 2 or more, and when it is 0.003 ⁇ cm 2 or more, the production becomes easier.
- the Rs in the case of (B) is preferably 0.02 ⁇ cm 2 or less, and more preferably 0.013 ⁇ cm 2 or less.
- ⁇ v is preferably 0.01 ⁇ cm or more, more preferably 0.02 ⁇ cm or more, preferably 0.4 ⁇ cm or less, and 0.1 ⁇ cm or less. It is more preferable, and it is particularly preferable that it is 0.07 ⁇ cm or less.
- the negative electrode for a non-aqueous electrolyte secondary battery according to the second aspect of the present invention has a negative electrode mixture layer containing a negative electrode active material on one or both sides of a current collector, and the negative electrode mixture layer and the current collector.
- the interfacial resistance Rs ( ⁇ cm 2 ) between them and the thickness d (cm) of the negative electrode mixture layer are Rs ⁇ 1.67d + b (where b is ⁇ 0.01 or more and 0 or less, preferably ⁇ . The relationship of 0.003 or less, more preferably ⁇ 0.005 or less) is satisfied.
- the value of Rs is preferably 0.002 ⁇ cm 2 or more, and the value of d is preferably 0.01 cm (100 ⁇ m) or less.
- the effect of enhancing the charge load characteristic of the non-aqueous electrolyte secondary battery becomes better.
- d is usually 0.0035 cm (35 ⁇ m) or more. Further, in order to improve the discharge capacity, d is preferably 0.005 cm (50 ⁇ m) or more, and more preferably 0.006 cm (60 ⁇ m) or more. On the other hand, if d is too thick, it becomes difficult to manufacture, so it is usually 0.01 cm (100 ⁇ m) or less, preferably 95 ⁇ m or less, and more preferably 80 ⁇ m or less.
- the value of Rs is actually 0.002 ⁇ cm 2 or more, and when it is 0.003 ⁇ cm 2 or more, the production becomes easier.
- the negative electrode of the present invention has a negative electrode mixture layer containing a negative electrode active material on one side or both sides of a current collector.
- a negative electrode active material used for the negative electrode of a conventionally known non-aqueous electrolyte secondary battery, that is, an active material capable of storing and releasing Li ions can be used.
- a negative electrode active material include graphite (natural graphite; artificial graphite obtained by graphitizing easily graphitized carbon such as thermally decomposed carbons, MCMB, and carbon fiber at 2800 ° C. or higher; etc.), heat, and the like.
- Carbon materials such as decomposed carbons, cokes, glassy carbons, calcined organic polymer compounds, mesophase carbon microbeads, carbon fibers, activated carbon, soft carbon, hard carbon; metals that can be alloyed with lithium (Si, Particles such as Sn) and materials containing these metals (alloys, oxides, etc.);
- metals that can be alloyed with lithium Si, Particles such as Sn
- materials containing these metals alloyed with these metals (alloys, oxides, etc.)
- For the negative electrode only one of the above-exemplified negative electrode active materials may be used, or two or more of them may be used in combination.
- the negative electrode mixture layer usually contains a binder.
- binder of the negative electrode mixture layer include polyvinylidene fluoride (PVDF), polytetrafluoroethylene, polyacrylic acid, chitosan, styrene butadiene rubber (SBR), carboxymethyl cellulose (CMC) and the like.
- the negative electrode mixture layer can also contain a conductive auxiliary agent.
- a conductive auxiliary agent of the negative electrode mixture layer graphite; carbon black (acetylene black, Ketjen black, etc.) and amorphous carbon materials such as carbon materials that generate amorphous carbon on the surface; fibrous carbon (fibrous carbon). Gas-phase-grown carbon fibers, carbon fibers obtained by carbonizing after spinning a pitch, etc.); carbon nanotubes (various multi-layered or single-layer carbon nanotubes); etc., and only one of these is used. Alternatively, two or more kinds may be used in combination.
- Copper, copper alloy, nickel, nickel alloy foil, punching metal, mesh, expanded metal, etc. can be used for the current collector of the negative electrode, but copper foil is usually used.
- the thickness of the negative electrode current collector is preferably, for example, 5 to 30 ⁇ m.
- the thickness of the negative electrode mixture layer referred to in the present specification is arbitrary by using the scale of SEM in the field of view where a cross section of the negative electrode is cut out and this cross section is observed at a magnification of 1000 times using a scanning electron microscope (SEM). It means the average value (number average value) of the thickness of the negative electrode mixture layer obtained at the 10 locations.
- the thickness of the negative electrode mixture layer means the thickness per one side of the current collector, but in the case of a negative electrode having an undercoat layer described later, the thickness of the negative electrode mixture layer is It means the total thickness of the thickness of the undercoat layer formed on the current collector and the thickness of the negative electrode mixture layer formed on the undercoat layer.
- Rs and ⁇ v of the negative electrode referred to in the present specification mean values obtained by the following method.
- the thickness of the negative electrode mixture layer is determined by the above method, and the thickness of the current collector is also determined by the same method. Then, using the electrode resistance measurement system "RM2610 (trade name)" manufactured by Hioki Denki Co., Ltd., the thickness ( ⁇ m) and resistance ( ⁇ cm) of the current collector of the negative electrode and the thickness ( ⁇ m) of the negative electrode mixture layer are measured. After inputting , the negative electrode, which is the measurement sample, is set in the system, the probe is lowered, and the measurement is started. Volume resistance of the agent layer: ⁇ v ( ⁇ cm) is obtained.
- the measurement speed is Normal
- the voltage range is 0.5V
- the maximum current value such that the voltage V1 calculated on the system software is 0.1V or less is set to 50mA, 10mA, 1mA, 100 ⁇ A. And choose from 10 ⁇ A.
- the resistivity ( ⁇ cm) of the current collector input to the system For the resistivity ( ⁇ cm) of the current collector input to the system, a known resistivity determined by the composition of the negative electrode current collector to be used is used. Further, the current collector obtained from a part of the negative electrode obtained from the battery is subjected to elemental analysis to specify the composition, and a known resistivity is used. Further, the negative electrode in the non-aqueous electrolyte secondary battery is taken out from the outer body of the battery in the discharged state, washed with diethyl carbonate a plurality of times, and then each of the above measurements is performed.
- Rs / ( ⁇ v ⁇ d) is calculated by measuring Rs and ⁇ v at any 15 points from one measurement sample by the above method. It means the average value (number average value) of the remaining 5 points, excluding 5 points from the largest value and 5 points from the smallest value.
- the Rs in the negative electrode of the second aspect is from the smallest value of 5 points from the largest value among the values obtained by measuring Rs at any 15 points from one measurement sample by the above method. It means the average value (number average value) of the values of the remaining 5 points excluding the 5 points.
- a negative electrode mixture containing a negative electrode active material and a binder and a conductive auxiliary agent used as needed is dispersed in water or an organic solvent such as N-methyl-2-pyrrolidone (NMP).
- NMP N-methyl-2-pyrrolidone
- the value of Rs / ( ⁇ v ⁇ d) is adjusted to a value corresponding to the thickness of the negative electrode mixture layer, and the value of the second aspect is adjusted.
- Rs and d are adjusted so as to satisfy the above relationship.
- the negative electrode mixture-containing composition when the negative electrode mixture-containing composition is applied to the current collector and then dried, if it is dried rapidly, a more conductive negative electrode active material or conductivity assist in the coating film of the negative electrode mixture-containing composition.
- the content ratio of the more conductive component on the surface of the negative electrode mixture layer (the surface opposite to the current collector) formed by the movement of the more conductive component such as the agent is the negative electrode combination. It tends to be larger than the other parts of the agent layer, and this phenomenon tends to increase the value of Rs, and as a result, the value of Rs / ( ⁇ v ⁇ d) also tends to be extremely large away from 1.0. This phenomenon occurs remarkably especially when the thickness of the negative electrode mixture layer is thick.
- the concentration unevenness of the higher conductive component in the negative electrode mixture layer due to the movement of the higher conductive component in the coating film of the negative electrode mixture-containing composition is possible.
- the value of Rs can be made smaller so that Rs and d satisfy the above-mentioned relationship, or the value of Rs / ( ⁇ v ⁇ d) can be adjusted according to the thickness of the negative electrode mixture layer. It is possible to adjust to the range of.
- the coating film of the composition containing a negative electrode mixture in addition to a method of drying at a constant temperature, a method of gradually raising the temperature of the drying furnace using a plurality of drying furnaces and slowly drying the coating; A method of delaying the drying of the surface part by leaving the volatilized solvent filled in the drying furnace; a method of keeping the temperature of the electrode uniform by keeping it out of the wind and delaying the drying of the surface as much as possible; the opposite of the coated surface.
- the method of gradually raising the temperature of the drying oven and slowly drying the mixture is effective in facilitating the control of the concentration unevenness of the more conductive component in the negative electrode mixture layer.
- the viscosity of the negative electrode mixture-containing composition which also reduces the concentration unevenness of the more conductive component in the negative electrode mixture layer, reduces the value of Rs, and reduces Rs.
- d can be adjusted so as to satisfy the above relationship, or the value of Rs / ( ⁇ v ⁇ d) can be adjusted to the above range according to the thickness of the negative electrode mixture layer. Further, although it depends on the type of the negative electrode mixture, for example, when the solid content concentration (total concentration of all components excluding the solvent) of the negative electrode mixture-containing composition is about 52 to 60% by mass, the negative electrode mixture-containing composition is coated.
- the constituent components of the negative electrode mixture layer can be suppressed from moving to the surface side of the coating film in the undried coating film.
- the method of adjusting Rs and d so as to satisfy the above relationship or adjusting Rs / ( ⁇ v ⁇ d) does not depend only on the solid content concentration of the negative electrode mixture-containing composition. ..
- the conductive auxiliary agent contained in the undercoat layer the same conductive auxiliary agents as those exemplified above that can be contained in the negative electrode mixture layer can be used.
- the undercoat layer may be formed only with the conductive auxiliary agent, but may contain a binder together with the conductive auxiliary agent, and the binder is exemplified above as being able to be contained in the negative electrode mixture layer. You can use the same as the various binders you have used.
- the thickness of the undercoat layer is preferably 50 to 1000 nm. Further, in the undercoat layer, the content of the conductive auxiliary agent is, for example, 1 to 100% by mass, and the content of the binder is, for example, 0 to 99% by mass.
- the undercoat layer is a composition for forming an undercoat layer prepared by dispersing a conductive auxiliary agent and a binder used as needed in an organic solvent such as water or NMP (the binder is dissolved in the solvent. May be formed) through a step of applying to the surface of the current collector and drying.
- the negative electrode mixture-containing composition may be applied to the surface of the undercoat layer formed on the surface of the current collector to form the negative electrode mixture layer by the above method.
- the composition for forming the undercoat layer (the coating film thereof) applied to the surface of the current collector is not dried, but the composition containing the negative electrode mixture is overcoated and then dried, and if necessary, press treatment is performed. By applying the coating, the undercoat layer and the negative electrode mixture layer can be formed at the same time.
- the content of the negative electrode active material in the negative electrode mixture layer is preferably 90 to 99% by mass.
- the negative electrode mixture layer may contain a conductive auxiliary agent.
- the method is a method of dispersing and containing a conductive auxiliary agent in the entire negative electrode mixture layer; a method of forming the undercoat layer; a method of dispersing the conductive auxiliary agent in the entire negative electrode mixture layer and the above-mentioned undercoat layer. Methods of forming; etc.
- the negative electrode mixture layer contains a conductive auxiliary agent, the content of the conductive auxiliary agent in the negative electrode mixture layer (when the negative electrode has an undercoat layer, the amount of the conductive auxiliary agent contained in the undercoat layer is also included).
- the negative electrode mixture layer does not have to contain a conductive auxiliary agent.
- the negative electrode of the present invention limits the amount of the conductive auxiliary agent in the negative electrode mixture layer as described above to suppress the deterioration of the storage characteristics of the battery. , It is possible to improve the charging load characteristics.
- the content of the binder in the negative electrode mixture layer (including the amount of the binder contained in the undercoat layer when the negative electrode has the undercoat layer) is preferably 1 to 10% by mass.
- a lead body for electrically connecting to other members in the non-aqueous electrolyte secondary battery may be formed on the negative electrode according to a conventional method.
- the non-aqueous electrolyte secondary battery of the present invention has a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte, and the negative electrode is a negative electrode for a non-aqueous electrolyte secondary battery of the present invention.
- the positive electrode for example, one having a positive electrode mixture layer containing a positive electrode active material, a conductive auxiliary agent, a binder and the like on one or both sides of a current collector can be used.
- the positive electrode active material is not particularly limited as long as it is a positive electrode active material used in a conventionally known non-aqueous electrolyte secondary battery, that is, an active material capable of storing and releasing Li ions.
- Specific examples of the positive electrode active material include LiM x Mn 2-x O 4 (where M is Li, B, Mg, Ca, Sr, Ba, Ti, V, Cr, Fe, Co, Ni, Cu, Al. , Sn, Sb, In, Nb, Mo, W, Y, Ru and Rh, which is at least one element selected from the group and is represented by 0.01 ⁇ x ⁇ 0.5).
- Manganese composite oxide Li x Ni (1-yz) Mn y M z O (2-k) Fl (However, M is Co, Mg, Al, B, Ti, V, Cr, Fe, Cu. , Zn, Zr, Mo, Sn, Ca, Sr, Ba and W, which are at least one element selected from the group consisting of 0.8 ⁇ x ⁇ 1.2, 0 ⁇ y ⁇ 0.5, 0.
- LiNi 1-x M x O 2 (where M is Al, Mg, Ti, Zr, Fe, Co, Cu, Zn, Ga, Ge, Nb, Mo), a lithium cobalt composite oxide represented by .5).
- LiM 1-x N x PO 4 LiM 1-x N x PO 4
- LiN x ⁇ 0.5 LiM 1-x N x PO 4
- N LiM 1-x N x PO 4
- M is at least one element selected from the group consisting of Fe, Mn and Co
- N is Al, Mg, Ti, Zr, Ni, Cu, Zn, Ga, Ge, Nb, Mo and Sn.
- Sb and Ba at least one element selected from the group, an olivine-type composite oxide represented by 0 ⁇ x ⁇ 0.5
- a lithium titanium composite represented by Li 4 Ti 5 O 12 examples thereof include oxides, and only one of these may be used, or two or more thereof may be used in combination.
- the conductive auxiliary agent of the positive electrode mixture layer one or more of the same as those exemplified above as those that can be contained in the negative electrode mixture layer can be used.
- binder of the positive electrode mixture layer one or more of the same ones as exemplified above as those that can be contained in the negative electrode mixture layer can be used.
- the positive electrode for example, a paste-like or slurry-like positive electrode mixture-containing composition in which a positive electrode active material, a conductive auxiliary agent, a binder and the like are dispersed in an organic solvent such as NMP or a solvent such as water is prepared (however, the binder is a solvent). It may be dissolved in), which is applied to one or both sides of the current collector, dried, and then subjected to a press treatment such as a calendar treatment as necessary.
- the positive electrode is not limited to the one manufactured by the above-mentioned manufacturing method, and may be manufactured by another method.
- a lead body for electrically connecting to other members in the non-aqueous electrolyte secondary battery may be formed on the positive electrode according to a conventional method, if necessary.
- the thickness of the positive electrode mixture layer is preferably, for example, 35 to 80 ⁇ m per one side of the current collector.
- the amount of the positive electrode active material is preferably 90 to 99.3% by mass, and the amount of the conductive auxiliary agent is preferably 0.2 to 9.5% by mass.
- the amount of the binder is preferably 0.5 to 3% by mass.
- a metal foil such as aluminum or stainless steel, punching metal, mesh, expanded metal, foamed metal; carbon sheet; etc. can be used.
- the thickness of the current collector is preferably 5 to 30 ⁇ m.
- the separator of the non-aqueous electrolyte secondary battery one having sufficient strength and capable of retaining a large amount of non-aqueous electrolyte is preferable, and a microporous film made of polyolefin such as polyethylene (PE) or polypropylene (PP) can be used. ..
- the microporous membrane constituting the separator may be, for example, one using only PE or only one using PP, may contain an ethylene-propylene copolymer, or may be made of PE. It may be a laminate of a membrane and a microporous membrane made of PP.
- the separator is composed of a porous layer mainly composed of a resin having a melting point of 140 ° C. or lower, and a porous layer mainly containing a resin having a melting point of 150 ° C. or higher or an inorganic filler having a heat resistant temperature of 150 ° C. or higher.
- a laminated separator can be used.
- melting point means the melting temperature measured by a differential scanning calorimeter (DSC) in accordance with the provisions of Japanese Industrial Standards (JIS) K7121, and "heat resistant temperature is 150 ° C or higher". Means that no deformation such as softening is observed at least at 150 ° C.
- the thickness of the separator is 10 to 30 ⁇ m.
- Non-aqueous electrolyte As the non-aqueous electrolyte of the secondary battery, a non-aqueous liquid electrolyte (non-aqueous electrolyte solution) is usually used.
- a non-aqueous electrolyte solution a solution in which an electrolyte salt such as a lithium salt is dissolved in an organic solvent is used.
- the organic solvent is not particularly limited, but for example, chain esters such as dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate, and methylpropyl carbonate; dielectrics such as ethylene carbonate, propylene carbonate, butylene carbonate, and vinylene carbonate. Examples thereof include a cyclic ester having a high rate; a mixed solvent of a chain ester and a cyclic ester; and a mixed solvent of a cyclic ester having a chain ester as a main solvent is particularly suitable.
- Examples of the electrolyte salt to be dissolved in the organic solvent in the preparation of the non-aqueous electrolyte solution include LiPF 6 , LiBF 4 , LiAsF 6 , LiSbF 6 , LiCF 3 SO 3 , LiC 4 F 9 SO 3 , LiCF 3 CO 2 , and Li 2 .
- Rf and Rf'are fluoroalkyl groups are used alone or in admixture of two or more.
- the concentration of the electrolyte salt in the non-aqueous electrolyte solution is not particularly limited, but is preferably 0.3 mol / l or more, more preferably 0.4 mol / l or more, and 1.7 mol / l or more. It is preferably less than or equal to, and more preferably 1.5 mol / l or less.
- the non-aqueous electrolyte includes, in addition to the non-aqueous electrolyte solution, a gel-like electrolyte obtained by gelling the non-aqueous electrolyte solution with a gelling agent made of a polymer or the like, or a known solid electrolyte. Can also be used.
- the positive electrode and the negative electrode can be used in the form of a laminated electrode body laminated via a separator or a wound electrode body wound around this laminated electrode body.
- FIG. 1 is a plan view of a non-aqueous electrolyte secondary battery
- FIG. 2 is a sectional view taken along line I-I of FIG.
- the electrode body 2 is housed in a laminate film exterior body 5 composed of two metal laminate films, and the laminate film exterior body 5 is the outer periphery thereof. In the portion, the upper and lower metal laminated films are sealed by heat fusion.
- the electrode body 2 is a laminated electrode body or a wound electrode body formed by laminating a positive electrode, a negative electrode for a non-aqueous electrolyte secondary battery of the present invention, and a separator interposed therein, and is a laminated film exterior. A non-aqueous electrolyte is enclosed in the body 5 together with the electrode body 2.
- each layer constituting the laminated film exterior body 5 and each component (positive electrode, negative electrode and separator) forming the electrode body 2 are divided. Not shown separately.
- the positive electrode of the electrode body 2 is connected to the positive electrode external terminal 3 in the battery 1, and although not shown, the negative electrode of the electrode body 2 is also connected to the negative electrode external terminal 4 in the battery 1. There is.
- the positive electrode external terminal 3 and the negative electrode external terminal 4 are drawn out on one end side to the outside of the laminated film exterior body 5 so as to be connectable to an external device or the like.
- an electrode body such as a laminated electrode body or a wound electrode body is loaded in the exterior body, and the non-aqueous electrolyte is further injected into the exterior body to immerse the electrode body in the non-aqueous electrolyte body. After that, it is manufactured by sealing the opening of the exterior body.
- an exterior body an exterior can made of steel, aluminum, an aluminum alloy, an exterior body made of a laminated film on which metal is vapor-deposited, or the like can be used.
- the battery having an outer can is a flat type having a battery case for caulking the outer can and the sealing plate via a gasket or welding the outer can and the sealing plate to seal the outer can.
- a lid is placed at the opening of a bottomed tubular (cylindrical, square-cylindrical, etc.) outer can, and caulked through a gasket, or the outer can and lid. Cylindrical shape that can be sealed by welding with; etc.
- the value of Rs / ( ⁇ v ⁇ d) required for the negative electrode for a non-aqueous electrolyte secondary battery is an index of the charge load characteristic of the non-aqueous electrolyte secondary battery having this negative electrode. Therefore, for the negative electrode for a non-aqueous electrolyte secondary battery, the interfacial resistance Rs ( ⁇ cm 2 ) between the negative electrode mixture layer and the current collector, the volume resistance ⁇ v ( ⁇ cm) of the negative electrode mixture layer, and the negative electrode mixture layer.
- the relationship between Rs and d required in the negative electrode for a non-aqueous electrolyte secondary battery is also an index of the charge load characteristic of the non-aqueous electrolyte secondary battery having this negative electrode. Therefore, for the negative electrode for a non-aqueous electrolyte secondary battery, a step of measuring the interface resistance Rs ( ⁇ cm 2 ) between the negative electrode mixture layer and the current collector and the thickness d (cm) of the negative electrode mixture layer is required.
- the negative electrode is, for example, the present invention. It is possible to determine whether or not the non-aqueous electrolyte secondary battery is suitable for manufacturing. According to the inspection method of the present invention, Rs and d do not satisfy the above-mentioned relationship [Rs ⁇ 1.67d (however, b is ⁇ 0.01 or more and 0 or less)], and the non-aqueous electrolyte secondary battery of the present invention has. Even a negative electrode determined to be unusable for manufacturing can be used for a battery that does not require high charge load characteristics, and thus can be used for manufacturing such a battery.
- Example 1 Manufacturing of positive electrode> Li 1.01 Ni 0.5 Co 0.2 Mn 0.3 O 2 (positive electrode active material), acetylene black (conductive aid) and PVDF (binder) are mixed in a mass ratio of 94: 4: 2. , NMP was dispersed to prepare a positive electrode mixture-containing slurry (solid content concentration excluding solvent was 75% by mass).
- This positive electrode mixture-containing slurry is intermittently applied to both sides of an aluminum foil having a thickness of 15 ⁇ m as a current collector, dried, and then subjected to a calendar treatment to make the total thickness of the positive electrode mixture layer 95 ⁇ m. Was adjusted. This was cut to prepare a long positive electrode. Further, an aluminum lead piece for extracting an electric current was welded to the exposed portion of the aluminum foil to obtain a positive electrode with a lead. The thickness of the positive electrode mixture layer in the obtained positive electrode was 40 ⁇ m per one side of the current collector.
- This negative mixture-containing paste is intermittently applied to one side of a copper foil having a thickness of 8 ⁇ m as a current collector, and a drying furnace having three dryers is used, and the most upstream dryer 1 is set to 115 ° C. in the middle.
- the dryer 2 of the part was set at 115 ° C. and the dryer 3 on the most downstream side was set at 120 ° C., and dried to form a negative mixture layer.
- a negative electrode mixture layer was formed on both sides of the copper foil.
- a calendar treatment was performed to adjust the thickness of the negative electrode mixture layer so that the total thickness was 80 ⁇ m. This was cut to produce a long negative electrode.
- a nickel lead piece for extracting an electric current was welded to the exposed portion of the copper foil to obtain a negative electrode with a lead.
- the thickness of the negative electrode mixture layer in the obtained negative electrode was 36 ⁇ m per one side of the current collector.
- LiPF 6 was dissolved in a solvent in which ethylene carbonate and diethyl carbonate were mixed at a volume ratio of 3: 7 at a concentration of 1.0 mol / l, and vinylene carbonate in an amount of 2% by mass was further added to add non-water.
- An electrolyte was prepared.
- ⁇ Assembly of non-aqueous electrolyte secondary battery> The positive electrode and the negative electrode were superposed via a separator (a PE microporous membrane having a thickness of 16 ⁇ m and a porosity of 40%) and wound in a spiral shape to prepare a wound electrode body. Then, the wound electrode body and the non-aqueous electrolyte solution were encapsulated inside the aluminum laminate film exterior to produce a non-aqueous electrolyte secondary battery.
- a separator a PE microporous membrane having a thickness of 16 ⁇ m and a porosity of 40%
- Comparative Example 1 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 120 ° C, the middle dryer 2 to 120 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 1 except that 3 was set at 120 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. ..
- Example 1 and Comparative Example 1 are CC-charged to 4.2 V at a current value of 0.5 C in an environment of 25 ° C., and subsequently the current value reaches 0.02 C at a voltage of 4.2 V. CV charging was performed until. Subsequent constant current (CC) discharge was performed on each battery in an environment of 25 ° C. at a current value of 0.2 C until the voltage reached 2.75 V.
- CC constant current
- Each battery after discharge was placed in a constant temperature bath adjusted to 35 ° C., and after the battery temperature became stable, the battery was charged with a current value of 2.5 C, and the voltage V1 after 1 second was measured.
- the value ⁇ V obtained by subtracting the voltage V0 before the start of charging from this voltage V1 was obtained, and the charge load characteristic of the battery was evaluated by this.
- the smaller the value of ⁇ V the larger the amount of electricity that can be charged before reaching the final voltage by CC charging with a large current value such as 2.5C, and the charging load characteristics of the battery are more excellent. It can be said that.
- the negative electrode has a negative electrode mixture layer having a thickness of 35 ⁇ m or more and less than 50 ⁇ m, and the value of Rs / ( ⁇ v ⁇ d) is appropriate.
- Example 2 A negative electrode was prepared in the same manner as in Example 1 except that the amount of the negative electrode mixture-containing paste applied to the current collector was adjusted so that the thickness of the negative electrode mixture layer was 41 ⁇ m per one side of the current collector, and this negative electrode was used.
- a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that it was used.
- Comparative Example 2 A negative electrode was prepared in the same manner as in Comparative Example 1 except that the thickness of the negative electrode mixture layer was adjusted to 40 ⁇ m per one side of the current collector by adjusting the amount of the negative electrode mixture-containing paste applied to the current collector.
- a non-aqueous electrolyte secondary battery was produced in the same manner as in Comparative Example 1 except that it was used.
- the charge load characteristics of the non-aqueous electrolyte secondary batteries of Example 2 and Comparative Example 2 were evaluated by the same method as that of the battery of Example 1. These evaluation results are shown in Table 2 together with the thickness of the negative electrode mixture layer at the negative electrode, 1.67d, Rs, ⁇ v and Rs / ( ⁇ v ⁇ d). In Table 2, the charge load characteristic evaluation result is shown as a relative value when the value of Comparative Example 2 is 100.
- the negative electrode has a negative electrode mixture layer having a thickness of 35 ⁇ m or more and less than 50 ⁇ m, and the value of Rs / ( ⁇ v ⁇ d) is appropriate.
- Example 3 A negative electrode was prepared in the same manner as in Example 1 except that the amount of the negative electrode mixture-containing paste applied to the current collector was adjusted so that the thickness of the negative electrode mixture layer was 45 ⁇ m per one side of the current collector, and this negative electrode was used.
- a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that it was used.
- Example 4 To dry the coating film of the paste containing the negative electrode mixture, use a drying furnace with three dryers, the most upstream dryer 1 to 115 ° C, the middle dryer 2 to 110 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 3 except that 3 was set at 115 ° C. and each was carried out. The thickness of the negative electrode mixture layer in the obtained negative electrode was 46 ⁇ m per one side of the current collector. Then, a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used.
- Comparative Example 3 To dry the coating film of the paste containing the negative electrode mixture, use a drying furnace with three dryers, the most upstream dryer 1 to 120 ° C, the middle dryer 2 to 120 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 3 except that 3 was set at 120 ° C. and each was carried out. The thickness of the negative electrode mixture layer in the obtained negative electrode was 47 ⁇ m per one side of the current collector. Then, a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used.
- the negative electrode has a negative electrode mixture layer having a thickness of 35 ⁇ m or more and less than 50 ⁇ m, and the value of Rs / ( ⁇ v ⁇ d) is appropriate.
- Example 5 Implemented except that the collector was changed to a copper foil with a thickness of 6 ⁇ m and the amount of the negative electrode mixture-containing paste applied to the collector was adjusted so that the thickness of the negative electrode mixture layer was 56 ⁇ m per side of the collector.
- a negative electrode was produced in the same manner as in Example 1, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that the negative electrode was used.
- Example 6 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 115 ° C, the middle dryer 2 to 110 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 5 except that 3 was set at 115 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. ..
- Comparative Example 4 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 120 ° C, the middle dryer 2 to 120 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 5 except that 3 was set at 120 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. ..
- Example 4 Regarding the non-aqueous electrolyte secondary batteries of Examples 5 and 6 and Comparative Example 4, the battery of Example 1 and the like except that the final voltage at the time of CC discharge at the time of the first CC charge-CV charge-CC discharge was changed to 3V, etc.
- the charge load characteristics were evaluated by the same method as above. These evaluation results are shown in Table 4 together with the thickness of the negative electrode mixture layer at the negative electrode, 1.67d, Rs, ⁇ v and Rs / ( ⁇ v ⁇ d). In Table 4, the charge load characteristic evaluation result is shown as a relative value when the value of Comparative Example 4 is 100.
- the negative electrode has a negative electrode mixture layer having a thickness of 50 ⁇ m or more and 100 ⁇ m or less, and the value of Rs / ( ⁇ v ⁇ d) is appropriate.
- Example 7 The amount of the negative mixture-containing paste to be applied to the current collector is changed, and the coating film of the negative negative mixture-containing paste is dried by using a drying furnace having three dryers, and the most upstream dryer 1 is 115.
- a negative electrode was produced in the same manner as in Example 1 except that the temperature was set to 110 ° C. for the dryer 2 in the middle portion and 120 ° C. for the dryer 3 on the most downstream side.
- the thickness of the negative electrode mixture layer in the obtained negative electrode was 63 ⁇ m per one side of the current collector.
- a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used.
- Comparative Example 5 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 120 ° C, the middle dryer 2 to 120 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 7 except that 3 was set at 120 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. ..
- the charge load characteristics of the non-aqueous electrolyte secondary batteries of Example 7 and Comparative Example 5 were evaluated by the same method as that of the battery of Example 5. These evaluation results are shown in Table 5 together with the thickness of the negative electrode mixture layer at the negative electrode, 1.67d, Rs, ⁇ v and Rs / ( ⁇ v ⁇ d). In Table 5, the charge load characteristic evaluation result is shown as a relative value when the value of Comparative Example 5 is 100.
- the negative electrode has a negative electrode mixture layer having a thickness of 50 ⁇ m or more and 100 ⁇ m or less, and the value of Rs / ( ⁇ v ⁇ d) is appropriate.
- Example 8 A negative electrode was prepared in the same manner as in Example 1 except that the amount of the negative electrode mixture-containing paste applied to the current collector was adjusted so that the thickness of the negative electrode mixture layer was 68 ⁇ m per one side of the current collector, and this negative electrode was used.
- a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that it was used.
- Example 9 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 115 ° C, the middle dryer 2 to 110 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 8 except that 3 was set at 115 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. ..
- Example 10 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 110 ° C, the middle dryer 2 to 105 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 8 except that 3 was set at 115 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. ..
- Comparative Example 6 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 120 ° C, the middle dryer 2 to 120 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 8 except that 3 was set at 120 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. ..
- the negative electrode has a negative electrode mixture layer having a thickness of 50 ⁇ m or more and 100 ⁇ m or less, and the value of Rs / ( ⁇ v ⁇ d) is appropriate.
- Example 11 The amount of the negative mixture-containing paste to be applied to the current collector is changed, and the coating film of the negative negative mixture-containing paste is dried by using a drying furnace having three dryers, and the most upstream dryer 1 is 115.
- a negative electrode was produced in the same manner as in Example 1 except that the temperature was set to 110 ° C. for the dryer 2 in the middle portion and 120 ° C. for the dryer 3 on the most downstream side.
- the thickness of the negative electrode mixture layer in the obtained negative electrode was 73 ⁇ m per one side of the current collector.
- a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used.
- Comparative Example 7 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 120 ° C, the middle dryer 2 to 120 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 11 except that 3 was set at 120 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. ..
- the charge load characteristics of the non-aqueous electrolyte secondary batteries of Example 11 and Comparative Example 7 were evaluated by the same method as that of the battery of Example 5. These evaluation results are shown in Table 7 together with the thickness of the negative electrode mixture layer at the negative electrode, 1.67d, Rs, ⁇ v and Rs / ( ⁇ v ⁇ d). In Table 7, the charge load characteristic evaluation result is shown as a relative value when the value of Comparative Example 7 is 100.
- the negative electrode has a negative electrode mixture layer having a thickness of 50 ⁇ m or more and 100 ⁇ m or less, and the value of Rs / ( ⁇ v ⁇ d) is appropriate.
- Example 12 The amount of the negative mixture-containing paste to be applied to the current collector is changed, and the coating film of the negative negative mixture-containing paste is dried by using a drying furnace having three dryers, and the most upstream dryer 1 is 115.
- a negative electrode was produced in the same manner as in Example 5 except that the temperature was set to 110 ° C. for the dryer 2 in the middle portion and 120 ° C. for the dryer 3 on the most downstream side.
- the thickness of the negative electrode mixture layer in the obtained negative electrode was 77 ⁇ m per one side of the current collector.
- a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used.
- Comparative Example 8 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 120 ° C, the middle dryer 2 to 120 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 12 except that 3 was set at 120 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. ..
- Example 12 Regarding the non-aqueous electrolyte secondary batteries of Example 12 and Comparative Example 8, the battery of Example 1 and the like except that the final voltage at the time of CC charging at the time of the first CC charge-CV charge-CC discharge was changed to 4.4 V, etc.
- the charge load characteristics were evaluated by the same method as above. These evaluation results are shown in Table 8 together with the thickness of the negative electrode mixture layer at the negative electrode, 1.67d, Rs, ⁇ v and Rs / ( ⁇ v ⁇ d). In Table 8, the charge load characteristic evaluation result is shown as a relative value when the value of Comparative Example 8 is 100.
- the negative electrode has a negative electrode mixture layer having a thickness of 50 ⁇ m or more and 100 ⁇ m or less, and the value of Rs / ( ⁇ v ⁇ d) is appropriate.
- Example 13 A negative electrode was prepared in the same manner as in Example 5 except that the amount of the negative electrode mixture-containing paste applied to the current collector was adjusted so that the thickness of the negative electrode mixture layer was 80 ⁇ m per one side of the current collector, and this negative electrode was used.
- a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that it was used.
- Example 14 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 115 ° C, the middle dryer 2 to 110 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 13 except that 3 was set at 115 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. ..
- Example 15 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 110 ° C, the middle dryer 2 to 105 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 13 except that 3 was set at 115 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. ..
- Example 16 In Example 1, a composition for forming an undercoat layer prepared by using a gas phase growth carbon fiber (conductive auxiliary agent) and chitosan (binder) in a mass ratio of 30:70 and dispersing them in NMP was prepared. It was applied to both sides of the same current collector (copper foil) as used and dried to form an undercoat layer having a thickness of 0.5 ⁇ m on both sides of the current collector.
- a gas phase growth carbon fiber conductive auxiliary agent
- chitosan binder
- the coating film of the negative electrode mixture-containing paste was dried using a drying furnace having three dryers, and the most upstream dryer 1 was set to 120 ° C.
- a negative electrode was produced in the same manner as in Example 13 except that the dryer 2 in the middle portion was set to 120 ° C and the dryer 3 on the most downstream side was set to 120 ° C.
- a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used.
- the thickness of the negative electrode mixture layer including the undercoat layer is 80 ⁇ m per one side of the current collector, and the composition of the negative electrode mixture layer including the undercoat layer is 95.7% by mass of the negative electrode active material.
- the conductive auxiliary agent was 0.1% by mass and the binder was 4.2% by mass.
- Example 17 Using the negative negative mixture-containing paste prepared in the same manner as in Example 1 except that the solid content concentration excluding the solvent was 53% by mass, the coating film of the negative negative mixture-containing paste was dried by using three dryers. Examples except that the dryer 1 on the most upstream side was set to 120 ° C, the dryer 2 on the intermediate portion was set to 120 ° C, and the dryer 3 on the most downstream side was set to 120 ° C by using the drying furnace having the same. A negative electrode was produced in the same manner as in 13. Then, a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used.
- Example 18 Graphite (negative electrode active material), CMC (binder), SBR (binder), and Timcal's "SUPER-C45 (trade name)" as a conductive auxiliary agent are mixed at a mass ratio of 95: 2: 2: 1.
- a paste containing a negative electrode mixture (solid content concentration excluding solvent was 44% by mass) was prepared by dispersing in water. Then, using this negative electrode mixture-containing paste, the coating film of the negative electrode mixture-containing paste is dried by using a drying furnace having three dryers, and the most upstream dryer 1 is set to 120 ° C. in the middle portion.
- a negative electrode was produced in the same manner as in Example 13 except that the dryer 2 was set at 120 ° C. and the most downstream dryer 3 was set at 120 ° C. Further, a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used.
- Comparative Example 9 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 120 ° C, the middle dryer 2 to 120 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 13 except that 3 was set at 120 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. did.
- the final voltage at the time of CC charge at the time of the first CC charge-CV charge-CC discharge was changed to 4.35 V, and at the time of CC discharge.
- the charge load characteristics were evaluated by the same method as the battery of Example 1 except that the final voltage was changed to 3V. These evaluation results are shown in Table 9 together with the thickness of the negative electrode mixture layer at the negative electrode, 1.67d, Rs, ⁇ v and Rs / ( ⁇ v ⁇ d). In Table 9, the charge load characteristic evaluation result is shown as a relative value when the value of Comparative Example 9 is 100.
- the negative electrode has a negative electrode mixture layer having a thickness of 50 ⁇ m or more and 100 ⁇ m or less, and the value of Rs / ( ⁇ v ⁇ d) is appropriate.
- Example 19 A negative electrode was prepared in the same manner as in Example 1 except that the amount of the negative electrode mixture-containing paste applied to the current collector was adjusted so that the thickness of the negative electrode mixture layer was 91 ⁇ m per one side of the current collector, and this negative electrode was used.
- a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that it was used.
- Example 20 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 115 ° C, the middle dryer 2 to 110 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 19 except that 3 was set at 120 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. ..
- Example 21 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 115 ° C, the middle dryer 2 to 110 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 19 except that 3 was set at 115 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. ..
- Example 22 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 110 ° C, the middle dryer 2 to 105 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 19 except that 3 was set at 115 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. ..
- Comparative Example 10 To dry the coating film of the negative electrode mixture-containing paste, use a drying furnace with three dryers, the most upstream dryer 1 to 120 ° C, the middle dryer 2 to 120 ° C, and the most downstream dryer. A negative electrode was produced in the same manner as in Example 19 except that 3 was set at 120 ° C., respectively, and a non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that this negative electrode was used. ..
- the negative electrode has a negative electrode mixture layer having a thickness of 50 ⁇ m or more and 100 ⁇ m or less, and the value of Rs / ( ⁇ v ⁇ d) is appropriate.
- the present invention can be implemented in a form other than the above as long as it does not deviate from the gist thereof.
- the embodiments disclosed in the present application are examples, and the present invention is not limited to these embodiments.
- the scope of the present invention shall be construed in preference to the description of the attached claims over the description of the above specification, and all changes within the scope of the claims shall be within the scope of the claims. included.
- the non-aqueous electrolyte secondary battery of the present invention has excellent charge load characteristics, and can be preferably applied to applications requiring particularly quick charge characteristics by taking advantage of these characteristics, and has been conventionally known. It can be applied to the same applications in which non-aqueous electrolyte secondary batteries are used. Further, the negative electrode for the non-aqueous electrolyte secondary battery of the present invention can constitute the non-aqueous electrolyte secondary battery of the present invention.
- Non-aqueous electrolyte secondary battery Electrode body 3 Positive electrode external terminal 4 Negative electrode external terminal 5 Laminated film exterior
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Abstract
Description
(B)前記負極合剤層の厚みが50μm以上100μm以下のときに、Rs/(ρv×d)が10~38.5。
(第1の態様の負極)
本発明の第1の態様の非水電解質二次電池用負極は、負極活物質を含有する負極合剤層を、集電体の片面または両面に有しており、負極合剤層と集電体との間の界面抵抗:Rsと、負極合剤層の体積抵抗率(ρv)と負極合剤層の厚み(d)との積:ρv×dとの比「Rs/(ρv×d)」が、負極合剤層の厚みに応じて、下記の通り、特定範囲内にある。この場合、負極の抵抗値が小さくなるためか、この負極を用いた非水電解質二次電池(本発明の非水電解質二次電池)の充電負荷特性を高めることが可能となる。
本発明の第2の態様の非水電解質二次電池用負極は、負極活物質を含有する負極合剤層を、集電体の片面または両面に有し、負極合剤層と集電体との間の界面抵抗Rs(Ωcm2)と、負極合剤層の厚みd(cm)とが、Rs≦1.67d+b(ただしbは、-0.01以上であって、0以下、好ましくは-0.003以下、より好ましくは-0.005以下)の関係を満たす。理由は定かではないが、Rsとdとが前記の関係を満たす場合にも、集電体と負極合剤層の界面の抵抗値が小さくなるため、この負極を用いた非水電解質二次電池(本発明の非水電解質二次電池)の充電負荷特性を高めることが可能となると推測される。
本発明の負極は、第1の態様、第2の態様のいずれにおいても、負極活物質を含有する負極合剤層を、集電体の片面または両面に有している。
本発明の非水電解質二次電池は、正極、負極、前記正極と前記負極との間に介在するセパレータおよび非水電解質を有し、前記負極が本発明の非水電解質二次電池用負極(第1の態様の負極、または第2の態様の負極)である。
非水電解質二次電池用負極において求められるRs/(ρv×d)の値は、この負極を有する非水電解質二次電池の充電負荷特性の指標となる。よって、非水電解質二次電池用負極について、負極合剤層と集電体との間の界面抵抗Rs(Ωcm2)、負極合剤層の体積抵抗率ρv(Ωcm)、および負極合剤層の厚みd(cm)を測定して、Rs/(ρv×d)の値を算出する工程と、前記Rs/(ρv×d)の値に基づいて、前記非水電解質二次電池用負極を適用する非水電解質二次電池を選別する工程とを有する本発明の検査方法によって、前記負極が、例えば本発明の非水電解質二次電池の製造に適したものであるか否かを判定することができる。なお、本発明の検査方法によって、Rs/(ρv×d)の値が例えば前記(A)および(B)のいずれも満たさず、本発明の非水電解質二次電池の製造に使用できないと判定された負極であっても、高い充電負荷特性が求められない電池には利用できるため、そのような電池の製造に使用することができる。
<正極の作製>
Li1.01Ni0.5Co0.2Mn0.3O2(正極活物質)とアセチレンブラック(導電助剤)とPVDF(バインダ)とを、94:4:2の質量比で混合し、NMPに分散させて正極合剤含有スラリー(溶媒を除く固形分濃度が75質量%)を調製した。
黒鉛(負極活物質)とCMC(バインダ)とSBR(バインダ)とを、96:2:2の質量比で混合し、水に分散させて負極合剤含有ペースト(溶媒を除く固形分濃度が50質量%)を調製した。
エチレンカーボネートとジエチルカーボネートとを3:7の体積比で混合した溶媒に、LiPF6を1.0mol/lの濃度で溶解させ、さらに2質量%となる量のビニレンカーボネートを添加して、非水電解液を調製した。
前記の正極と前記の負極とを、セパレータ(厚みが16μmで、空孔率が40%のPE製微多孔膜)を介して重ね、渦巻状に巻回して巻回電極体を作製した。そして、前記巻回電極体と前記非水電解液とを、アルミニウムラミネートフィルム外装体内に封入することで、非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を120℃に、中間部のドライヤー2を120℃に、最も下流側のドライヤー3を120℃に、それぞれ設定して実施した以外は、実施例1と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
実施例1および比較例1の電池について、25℃の環境下で、0.5Cの電流値で4.2VまでCC充電し、引き続いて4.2Vの電圧で電流値が0.02Cに到達するまでCV充電を行った。その後の各電池について、25℃の環境下で、0.2Cの電流値で電圧が2.75Vになるまで定電流(CC)放電を行った。
集電体に塗布する負極合剤含有ペーストの量を調整して負極合剤層の厚みを集電体の片面当たり41μmとした以外は実施例1と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
集電体に塗布する負極合剤含有ペーストの量を調整して負極合剤層の厚みを集電体の片面当たり40μmとした以外は比較例1と同様にして負極を作製し、この負極を用いた以外は比較例1と同様にして非水電解質二次電池を作製した。
集電体に塗布する負極合剤含有ペーストの量を調整して負極合剤層の厚みを集電体の片面当たり45μmとした以外は実施例1と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を115℃に、中間部のドライヤー2を110℃に、最も下流側のドライヤー3を115℃に、それぞれ設定して実施した以外は、実施例3と同様にして負極を作製した。得られた負極における負極合剤層の厚みは、集電体の片面あたり46μmであった。そして、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を120℃に、中間部のドライヤー2を120℃に、最も下流側のドライヤー3を120℃に、それぞれ設定して実施した以外は、実施例3と同様にして負極を作製した。得られた負極における負極合剤層の厚みは、集電体の片面あたり47μmであった。そして、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
集電体を厚みが6μmの銅箔に変更し、集電体に塗布する負極合剤含有ペーストの量を調整して負極合剤層の厚みを集電体の片面当たり56μmとした以外は実施例1と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を115℃に、中間部のドライヤー2を110℃に、最も下流側のドライヤー3を115℃に、それぞれ設定して実施した以外は、実施例5と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を120℃に、中間部のドライヤー2を120℃に、最も下流側のドライヤー3を120℃に、それぞれ設定して実施した以外は、実施例5と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
集電体に塗布する負極合剤含有ペーストの量を変更し、かつ負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を115℃に、中間部のドライヤー2を110℃に、最も下流側のドライヤー3を120℃に、それぞれ設定して実施した以外は、実施例1と同様にして負極を作製した。得られた負極における負極合剤層の厚みは、集電体の片面あたり63μmであった。そして、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を120℃に、中間部のドライヤー2を120℃に、最も下流側のドライヤー3を120℃に、それぞれ設定して実施した以外は、実施例7と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
集電体に塗布する負極合剤含有ペーストの量を調整して負極合剤層の厚みを集電体の片面当たり68μmとした以外は実施例1と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を115℃に、中間部のドライヤー2を110℃に、最も下流側のドライヤー3を115℃に、それぞれ設定して実施した以外は、実施例8と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を110℃に、中間部のドライヤー2を105℃に、最も下流側のドライヤー3を115℃に、それぞれ設定して実施した以外は、実施例8と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を120℃に、中間部のドライヤー2を120℃に、最も下流側のドライヤー3を120℃に、それぞれ設定して実施した以外は、実施例8と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
集電体に塗布する負極合剤含有ペーストの量を変更し、かつ負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を115℃に、中間部のドライヤー2を110℃に、最も下流側のドライヤー3を120℃に、それぞれ設定して実施した以外は、実施例1と同様にして負極を作製した。得られた負極における負極合剤層の厚みは、集電体の片面あたり73μmであった。そして、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を120℃に、中間部のドライヤー2を120℃に、最も下流側のドライヤー3を120℃に、それぞれ設定して実施した以外は、実施例11と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
集電体に塗布する負極合剤含有ペーストの量を変更し、かつ負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を115℃に、中間部のドライヤー2を110℃に、最も下流側のドライヤー3を120℃に、それぞれ設定して実施した以外は、実施例5と同様にして負極を作製した。得られた負極における負極合剤層の厚みは、集電体の片面あたり77μmであった。そして、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を120℃に、中間部のドライヤー2を120℃に、最も下流側のドライヤー3を120℃に、それぞれ設定して実施した以外は、実施例12と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
集電体に塗布する負極合剤含有ペーストの量を調整して負極合剤層の厚みを集電体の片面当たり80μmとした以外は実施例5と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を115℃に、中間部のドライヤー2を110℃に、最も下流側のドライヤー3を115℃に、それぞれ設定して実施した以外は、実施例13と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を110℃に、中間部のドライヤー2を105℃に、最も下流側のドライヤー3を115℃に、それぞれ設定して実施した以外は、実施例13と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
気相成長炭素繊維(導電助剤)とキトサン(バインダ)とを、30:70の質量比で使用し、これらをNMPに分散させて調製したアンダーコート層形成用組成物を、実施例1で用いたものと同じ集電体(銅箔)の両面に塗布し、乾燥して、集電体の両面に、それぞれ0.5μmの厚みのアンダーコート層を形成した。
溶媒を除く固形分濃度を53質量%とした以外は実施例1と同様にして調製した負極合剤含有ペーストを使用し、この負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を120℃に、中間部のドライヤー2を120℃に、最も下流側のドライヤー3を120℃に、それぞれ設定して実施した以外は、実施例13と同様にして負極を作製した。そして、この負極を用いた以外は、実施例1と同様にして非水電解質二次電池を作製した。
黒鉛(負極活物質)とCMC(バインダ)とSBR(バインダ)と導電助剤としてティムカル社製「SUPER-C45(商品名)」とを、95:2:2:1の質量比で混合し、水に分散させて負極合剤含有ペースト(溶媒を除く固形分濃度が44質量%)を調製した。そして、この負極合剤含有ペーストを使用し、負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を120℃に、中間部のドライヤー2を120℃に、最も下流側のドライヤー3を120℃に、それぞれ設定して実施した以外は、実施例13と同様にして負極を作製した。さらに、この負極を用いた以外は、実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を120℃に、中間部のドライヤー2を120℃に、最も下流側のドライヤー3を120℃に、それぞれ設定して実施した以外は、実施例13と同様にして負極を作製し、この負極を用いた以外は、実施例1と同様にして非水電解質二次電池を作製した。
集電体に塗布する負極合剤含有ペーストの量を調整して負極合剤層の厚みを集電体の片面当たり91μmとした以外は実施例1と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を115℃に、中間部のドライヤー2を110℃に、最も下流側のドライヤー3を120℃に、それぞれ設定して実施した以外は、実施例19と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を115℃に、中間部のドライヤー2を110℃に、最も下流側のドライヤー3を115℃に、それぞれ設定して実施した以外は、実施例19と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を110℃に、中間部のドライヤー2を105℃に、最も下流側のドライヤー3を115℃に、それぞれ設定して実施した以外は、実施例19と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
負極合剤含有ペーストの塗膜の乾燥を、3基のドライヤーを有する乾燥炉を使用し、最も上流側のドライヤー1を120℃に、中間部のドライヤー2を120℃に、最も下流側のドライヤー3を120℃に、それぞれ設定して実施した以外は、実施例19と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解質二次電池を作製した。
2 電極体
3 正極外部端子
4 負極外部端子
5 ラミネートフィルム外装体
Claims (14)
- 負極活物質を含有する負極合剤層を、集電体の片面または両面に有する非水電解質二次電池用負極であって、
前記負極合剤層の、前記集電体の片面あたりの厚みが35μm以上50μm未満であり、
前記負極合剤層と前記集電体との間の界面抵抗をRs(Ωcm2)、前記負極合剤層の体積抵抗率をρv(Ωcm)、前記負極合剤層の厚みをd(cm)としたとき、Rs/(ρv×d)が5~20であることを特徴とする非水電解質二次電池用負極。 - 負極活物質を含有する負極合剤層を、集電体の片面または両面に有する非水電解質二次電池用負極であって、
前記負極合剤層の、前記集電体の片面あたりの厚みが50μm以上100μm以下であり、
前記負極合剤層と前記集電体との間の界面抵抗をRs(Ωcm2)、前記負極合剤層の体積抵抗率をρv(Ωcm)、前記負極合剤層の厚みをd(cm)としたとき、Rs/(ρv×d)が10~38.5であることを特徴とする非水電解質二次電池用負極。 - 負極活物質を含有する負極合剤層を、集電体の片面または両面に有する非水電解質二次電池用負極であって、
前記負極合剤層と前記集電体との間の界面抵抗をRs(Ωcm2)とし、前記負極合剤層の厚みをd(cm)としたとき、Rs≦1.67d+b(ただしbは-0.01以上0以下)の関係を満たすことを特徴とする非水電解質二次電池用負極。 - 前記dが100μm以下である請求項3に記載の非水電解質二次電池用負極。
- 前記Rsが0.002Ωcm2以上である請求項3または4に記載の非水電解質二次電池用負極。
- 前記bが、-0.01以上-0.003以下である請求項3~5のいずれかに記載の非水電解質二次電池用負極。
- 前記bが、-0.01以上-0.005以下である請求項3~5のいずれかに記載の非水電解質二次電池用負極。
- 正極、負極、前記正極と前記負極との間に介在するセパレータおよび非水電解質を有する非水電解質二次電池であって、
前記負極が、請求項1~7のいずれかに記載の非水電解質二次電池用負極であることを特徴とする非水電解質二次電池。 - 負極活物質を含有する負極合剤層を、集電体の片面または両面に形成するに際し、
前記負極合剤層の、前記集電体の片面あたりの厚みを35μm以上50μm未満とし、
前記負極合剤層と前記集電体との間の界面抵抗をRs(Ωcm2)、前記負極合剤層の体積抵抗率をρv(Ωcm)、前記負極合剤層の厚みをd(cm)としたとき、Rs/(ρv×d)を5~20に調整することを特徴とする非水電解質二次電池用負極の製造方法。 - 負極活物質を含有する負極合剤層を、集電体の片面または両面に形成するに際し、
前記負極合剤層の、前記集電体の片面あたりの厚みを50μm以上100μm以下とし、
前記負極合剤層と前記集電体との間の界面抵抗をRs(Ωcm2)、前記負極合剤層の体積抵抗率をρv(Ωcm)、前記負極合剤層の厚みをd(cm)としたとき、Rs/(ρv×d)を10~38.5に調整することを特徴とする非水電解質二次電池用負極の製造方法。 - 負極活物質を含有する負極合剤層を、集電体の片面または両面に形成するに際し、
前記負極合剤層と前記集電体との間の界面抵抗をRs(Ωcm2)とし、前記負極合剤層の厚みをd(cm)としたとき、Rs≦1.67d+b(ただしbは-0.01以上0以下)の関係を満たすように調整することを特徴とする非水電解質二次電池用負極の製造方法。 - 正極、負極、前記正極と前記負極との間に介在するセパレータおよび非水電解質を有する非水電解質二次電池を製造するに際し、前記負極として、請求項9~11のいずれかに記載の非水電解質二次電池用負極の製造方法によって製造された非水電解質二次電池用負極を使用することを特徴とする非水電解質二次電池の製造方法。
- 負極活物質を含有する負極合剤層を、集電体の片面または両面に有する非水電解質二次電池用負極の検査方法であって、
非水電解質二次電池用負極について、前記負極合剤層と前記集電体との間の界面抵抗Rs(Ωcm2)、前記負極合剤層の体積抵抗率ρv(Ωcm)、および前記負極合剤層の厚みd(cm)を測定して、Rs/(ρv×d)の値を算出する工程と、
前記Rs/(ρv×d)の値に基づいて、前記非水電解質二次電池用負極を適用する非水電解質二次電池を選別する工程とを有することを特徴とする非水電解質二次電池用負極の検査方法。 - 負極活物質を含有する負極合剤層を、集電体の片面または両面に有する非水電解質二次電池用負極の検査方法であって、
非水電解質二次電池用負極について、前記負極合剤層と前記集電体との間の界面抵抗Rs(Ωcm2)、および前記負極合剤層の厚みd(cm)を測定する工程と、
前記Rsと前記dとの関係に基づいて、前記非水電解質二次電池用負極を適用する非水電解質二次電池を選別する工程とを有することを特徴とする非水電解質二次電池用負極の検査方法。
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