WO2015015663A1 - 二次電池 - Google Patents
二次電池 Download PDFInfo
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- WO2015015663A1 WO2015015663A1 PCT/JP2013/083137 JP2013083137W WO2015015663A1 WO 2015015663 A1 WO2015015663 A1 WO 2015015663A1 JP 2013083137 W JP2013083137 W JP 2013083137W WO 2015015663 A1 WO2015015663 A1 WO 2015015663A1
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- positive electrode
- active material
- negative electrode
- thickness
- current collector
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
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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
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/06—Electrodes for primary cells
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
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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
- H01M4/64—Carriers or collectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to a secondary battery in which a positive electrode and a negative electrode are overlapped via a separator.
- Secondary batteries can be broadly classified into wound type and stacked type.
- the battery element of the wound secondary battery has a structure in which a long positive electrode sheet and a negative electrode sheet are wound a plurality of times in a state of being overlapped while being separated by a separator.
- the battery element of the stacked secondary battery has a structure in which positive electrode sheets and negative electrode sheets are alternately and repeatedly stacked while being separated by a separator.
- an active material is used to connect an electrode terminal to an application portion in which an active material (including a binder or a mixture containing a conductive material) is applied to a current collector. And an uncoated portion that is not coated.
- one end of the positive electrode terminal is electrically connected to the uncoated portion of the positive electrode sheet, and the other end is drawn out of the outer container (exterior case).
- the battery element is enclosed in the outer container so that one end of the negative electrode terminal is electrically connected to the uncoated portion of the negative electrode sheet and the other end is drawn out of the outer container.
- an electrolytic solution is sealed together with the battery element.
- Secondary batteries have a tendency to increase in capacity year by year. Along with this, the heat generated in the event of a short circuit becomes larger and the danger increases. Therefore, battery safety measures are becoming more and more important.
- Patent Document 1 a technique is known in which an insulating member is formed at a boundary portion between an applied portion and an uncoated portion in order to prevent a short circuit between the positive electrode and the negative electrode.
- the battery element in order to stabilize the electrical characteristics and reliability of the secondary battery, it is preferable to fix the battery element with a tape or the like and press the battery element with a uniform pressure.
- an insulating member such as Patent Document 1
- the battery element cannot be uniformly pressed due to the difference in thickness between the portion where the insulating member 40 exists and the portion where the insulating member 40 does not exist. There is a risk that the quality of the battery may be degraded, such as variations in battery life and cycle characteristics.
- an object of the present invention is to solve the above-described problems, prevent a short circuit between the positive electrode and the negative electrode by an insulating member, and suppress an increase in volume and deformation of the battery element, so that electrical characteristics and reliability can be achieved. It is to provide a high-quality secondary battery with high quality.
- the secondary battery of the present invention includes a battery element in which positive electrodes and negative electrodes are alternately stacked via separators, and each of the positive electrode and the negative electrode includes a current collector and an active material applied to the current collector. Including. Each surface of the current collector is provided with an application part to which an active material is applied and an unapplied part to which no active material is applied. The active material has an inclined part or a step part whose thickness decreases at least at a part of the outer edge part of the application part. An insulating member is arranged so as to cover a boundary portion between the application portion and the non-application portion of the positive electrode.
- One or both of the insulating members provided on the positive electrode current collector has one end located on the inclined surface or step of the active material of the positive electrode and the negative electrode collector.
- One or both of the active materials respectively formed on both sides of the electric body are opposed to the inclined portion or the step portion of the active material, and the other end portion is located on the uncoated portion of the positive electrode. ing.
- the secondary battery of the present invention it is possible to suppress the increase in the volume of the battery element and the distortion of the battery element due to the insulating member. Therefore, it is possible to provide a high-quality secondary battery excellent in energy density. .
- FIG. 4 is an enlarged cross-sectional view showing a modification of the secondary battery shown in FIG. 2.
- FIG. 8a It is a top view which shows the negative electrode formation process of the manufacturing method of the secondary battery of this invention. It is a top view which shows the process of following the manufacturing method of the secondary battery of this invention of FIG. It is a top view which shows the negative electrode cut
- FIG. 16 is a plan view illustrating a process following the process of FIG. 15 in the method for manufacturing a secondary battery of the present invention. It is a top view which shows the positive electrode cut
- FIG. 1 schematically shows an example of the configuration of a stacked lithium ion secondary battery employing the present invention.
- the lithium ion secondary battery 100 of the present invention includes an electrode laminate (battery element) in which a plurality of positive electrodes (positive electrode sheets) 1 and negative electrodes (negative electrode sheets) 6 are laminated with separators 20 interposed therebetween. .
- This electrode laminate is housed in an outer container made of the flexible film 30 together with the electrolytic solution.
- One end of the positive electrode terminal 11 is connected to the positive electrode 1 of the electrode laminate, and one end of the negative electrode terminal 16 is connected to the negative electrode 6.
- the other end side of the positive electrode terminal 11 and the other end side of the negative electrode terminal 16 are respectively acceptable.
- the flexible film 30 is drawn outside. In FIG. 1, a part of each layer constituting the electrode stack (a layer located in an intermediate portion in the thickness direction) is not shown, and an electrolytic solution is shown.
- the positive electrode 1 includes a positive electrode current collector 3 and a positive electrode active material 2 applied to the positive electrode current collector 3, and a coating portion in which the positive electrode active material 2 is applied to the front and back surfaces of the positive electrode current collector 3. And the uncoated portion where the positive electrode active material 2 is not coated are positioned side by side along the longitudinal direction.
- the negative electrode 6 includes a negative electrode current collector 8 and a negative electrode active material 7 applied to the negative electrode current collector 8, and a coated portion and an uncoated portion are provided on the front and back surfaces of the negative electrode current collector 8. , Located side by side along the longitudinal direction.
- An end portion of the coated portion (positive electrode active material 2) at the boundary portion with the uncoated portion may be slightly inclined, but may be substantially perpendicular to the positive electrode current collector 3.
- the end of the coating part (negative electrode active material 8) may be slightly inclined or may be substantially perpendicular to the negative electrode current collector 7.
- the uncoated portions of the positive electrode 1 and the negative electrode 6 are used as tabs for connecting to electrode terminals (the positive electrode terminal 11 or the negative electrode terminal 16).
- the positive electrode tabs connected to the positive electrode 1 are gathered on the positive electrode terminal 11 and connected together with the positive electrode terminal 11 by ultrasonic welding or the like.
- the negative electrode tabs connected to the negative electrode 6 are gathered on the negative electrode terminal 16 and are connected together with the negative electrode terminal 16 by ultrasonic welding or the like.
- the other end portion of the positive electrode terminal 11 and the other end portion of the negative electrode terminal 16 are respectively drawn out of the exterior container.
- an insulating member 40 for preventing a short circuit with the negative electrode terminal 16 is formed so as to cover the boundary portion 4 a between the coated portion and the uncoated portion of the positive electrode 1.
- the insulating member 40 is preferably formed over both the positive electrode tab (the portion where the positive electrode active material 2 of the positive electrode current collector is not applied) and the positive electrode active material 2 so as to cover the boundary portion 4a. The formation of the insulating member 40 will be described later.
- the outer dimension of the coating part (negative electrode active material 7) of the negative electrode 6 is larger than the outer dimension of the coating part (positive electrode active material 2) of the positive electrode 1 and smaller than the outer dimension of the separator 20.
- examples of the positive electrode active material 2 include LiCoO 2 , LiNiO 2 , LiNi (1-x) CoO 2 , LiNi x (CoAl) (1-x) O 2 , Li 2 MO 3 —LiMO 2.
- Layered oxide materials such as LiNi 1/3 Co 1/3 Mn 1/3 O 2 and spinel materials such as LiMn 2 O 4 , LiMn 1.5 Ni 0.5 O 4 , LiMn (2-x) M x O 4
- olivine materials such as LiMPO 4
- fluorinated olivine materials such as Li 2 MPO 4 F and Li 2 MSiO 4 F
- vanadium oxide materials such as V 2 O 5, etc. Or a mixture of two or more.
- Examples of the negative electrode active material 7 include carbon materials such as graphite, amorphous carbon, diamond-like carbon, fullerene, carbon nanotube, and carbon nanohorn, lithium metal materials, alloy materials such as silicon and tin, Nb 2 O 5 and TiO.
- An oxide-based material such as 2 or a composite thereof can be used.
- a binder, a conductive auxiliary agent, and the like can be appropriately added to the positive electrode active material 2 and the negative electrode active material 7.
- a conductive support agent 1 type in carbon black, carbon fiber, or graphite can be used, or a combination of 2 or more types can be used.
- the binder polyvinylidene fluoride, polytetrafluoroethylene, carboxymethylcellulose, modified acrylonitrile rubber particles, and the like can be used.
- the positive electrode current collector 3 aluminum, stainless steel, nickel, titanium, or an alloy thereof can be used, and aluminum is particularly preferable.
- the negative electrode current collector 8 copper, stainless steel, nickel, titanium, or an alloy thereof can be used.
- the electrolyte includes cyclic carbonates such as ethylene carbonate, propylene carbonate, vinylene carbonate, butylene carbonate, ethyl methyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), and dipropyl carbonate (DPC).
- cyclic carbonates such as ethylene carbonate, propylene carbonate, vinylene carbonate, butylene carbonate, ethyl methyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), and dipropyl carbonate (DPC).
- EMC ethyl methyl carbonate
- DEC diethyl carbonate
- DMC dimethyl carbonate
- DPC dipropyl carbonate
- 1 type or 2 types or more of organic solvents such as chain carbonates, such as chain carbonates, aliphatic carboxylic acid esters, ⁇ -lactones such as ⁇ -butyrolactone, chain ethers, and cycl
- the separator 20 is mainly made of a resin porous film, woven fabric, non-woven fabric, and the like, and as its resin component, for example, a polyolefin resin such as polypropylene or polyethylene, a polyester resin, an acrylic resin, a styrene resin, or a nylon resin is used. it can.
- a polyolefin-based microporous membrane is preferable because of its excellent ion permeability and performance of physically separating the positive electrode and the negative electrode.
- the separator 20 may be formed with a layer containing inorganic particles, and examples of the inorganic particles include insulating oxides, nitrides, sulfides, carbides, etc. It is preferable to contain TiO 2 or Al 2 O 3 .
- a case or a can case made of the flexible film 30 can be used as the outer container, and the flexible film 30 is preferably used from the viewpoint of reducing the weight of the battery.
- the flexible film 30 a film in which a resin layer is provided on the front and back surfaces of a metal layer serving as a base material can be used.
- a metal layer having a barrier property such as prevention of leakage of the electrolytic solution or entry of moisture from the outside can be selected, and aluminum, stainless steel, or the like can be used.
- a heat-fusible resin layer such as a modified polyolefin is provided.
- An exterior container is formed by making the heat-fusible resin layers of the flexible film 30 face each other and heat-sealing the periphery of the portion that houses the electrode laminate.
- a resin layer such as a nylon film or a polyester film can be provided on the surface of the exterior body that is the surface opposite to the surface on which the heat-fusible resin layer is formed.
- the positive electrode terminal 11 can be made of aluminum or an aluminum alloy
- the negative electrode terminal 16 can be made of copper, a copper alloy, or those plated with nickel.
- the other end side of each terminal 11 and 16 is pulled out of the exterior container.
- a heat-sealable resin can be provided in advance at a location corresponding to a portion of each terminal 11, 16 that is thermally welded to the outer peripheral portion of the outer container.
- the insulating member 40 formed so as to cover the boundary portion 4a between the coated portion and the uncoated portion of the positive electrode active material 2 polyimide, glass fiber, polyester, polypropylene, or a material containing these can be used.
- the insulating member 40 can be formed by applying heat to the tape-shaped resin member and welding it to the boundary portion 4a, or by applying a gel-like resin to the boundary portion 4a and then drying.
- FIG. 2 is a schematic cross-sectional view for explaining an embodiment of the lithium ion secondary battery according to the present invention, in which only a part of the electrode laminate is enlarged and schematically described.
- the outer edge portion of the coated portion of the positive electrode active material 2 (the end portion adjacent to the uncoated portion) has a layer thickness of the positive electrode active material 2.
- the inclined portion 2a is gradually and gradually thinner from the flat portion 2b.
- one end part (end part located on the layer of the positive electrode active material 2) 40a of the insulating member 40 is located on the inclination part 2a.
- the application part of the active material 2 of the positive electrode 1 is a single-side application part in which the positive electrode active material 2 is applied only on one side (the lower surface in FIG. 2). Yes.
- the boundary portion 4a between the coated portion and the uncoated portion of the positive electrode active material 2 is formed to have different plane positions on the front and back of the positive electrode current collector 3, and the central portion of the electrode stack (the left side in FIG. 2). )
- the double-sided application part, the single-sided application part, and the double-sided non-application part are arranged in this order.
- the outer edge portion (the end portion adjacent to the uncoated portion) of the coated portion of the negative electrode active material 7 has a flat portion 7 b where the thickness of the negative electrode active material 7 is flat. It becomes the inclined part 7a which becomes thin gradually from.
- One end portion 40a of the insulating member 40 positioned on the positive electrode active material 2 is positioned on the inclined portion 2a of the positive electrode active material 2 as described above and is opposed to the inclined portion 7a of the negative electrode active material 7. is doing. That is, one end portion 40 a of the insulating member 40 is in a position where it planarly overlaps the inclined portion 2 a of the positive electrode active material 2 and the inclined portion 7 a of the negative electrode active material 7.
- the end portion 40a of the insulating member 40 is located where the positive electrode active material 2 and the negative electrode active material 7 are thinned. Then, the thickness of the positive electrode active material 2 and the negative electrode active material 7 becomes thinner toward the other end 40b of the insulating member 40, and finally the portion where the positive electrode active material 2 and the negative electrode active material 7 do not exist. It reaches. Therefore, the insulating member 40 does not overlap the thickest part of the positive electrode active material 2 or the negative electrode active material 7, and the insulating member 40 can suppress the electrode stack from becoming thick. In particular, as shown in FIG.
- the end 40 a of the insulating member 40 has a decrease in the thickness of the positive electrode active material 2 and the negative electrode active material 7 among the inclined surfaces 2 a and 7 a of the positive electrode active material 2 and the negative electrode active material 7.
- the increase in thickness due to the insulating member 40 is absorbed by the reduction in the thickness of the positive electrode active material 2 and the negative electrode active material 7. (Offset), the effect of suppressing the increase in thickness is great.
- the stepped portion 2c whose thickness is gradually reduced as shown in FIG. If the insulating member 40 is disposed in the portion where the thickness of the positive electrode active material 2 is reduced by the step 2c, the same effect as described above can be obtained. Similarly, a step portion may be provided in the negative electrode active material 7. In the example shown in FIG. 3, the gentle inclined surface 2a and the stepped portion 2c are both provided, but only the stepped portion 2c may be provided, and a plurality of stepped portions 2c are formed in a step shape. It may be.
- FIGS. 4 and 5 are states in the middle of electrode fabrication for easy understanding of the positional relationship between the positive electrode 1, the negative electrode 6, the separator 20, and the insulating member 40 of the stacked battery (laminated battery) shown in FIGS. FIG.
- FIG. 4 shows a state in which the positive electrode active material 2 is intermittently applied to the surface of a large-area positive electrode current collector 3 for manufacturing a plurality of positive electrodes (positive electrode sheets) 1.
- At least a part of the outer edge portion of each positive electrode active material 2 (specifically, the outer edge portion on the side to which the positive electrode terminal 11 is connected later) is inclined portion 2a (the thickness gradually decreases toward the outside). 2) is formed.
- one end 40a is positioned on the inclined portion 2a on the surface of each positive electrode active material 2, and the other end 40b is positioned on an uncoated portion where the positive electrode active material 2 is not applied. Insulating members 40 are respectively formed.
- the positive electrode active material 2 is intermittently applied to the back surface of the positive electrode current collector 3, and at least a part of the outer edge portion of each positive electrode active material 2 (the outer edge portion on the side where the positive electrode terminal 11 is connected).
- an inclined portion 2a whose thickness gradually decreases toward the outside is formed.
- the insulating member 40 is each formed in the back surface of each positive electrode active material 2 so that the one end 40a may be located on the inclination part 2a, and the other end 40b may be located on an uncoated part, respectively. As shown in FIG.
- the boundary portion 4a between the coated portion and the uncoated portion on the surface of the positive electrode active material 2 and the boundary portion 4a between the coated portion and the uncoated portion on the back surface of the positive electrode active material 2 are planar. In different positions. That is, the position of the boundary portion 4 a between the coated portion and the uncoated portion is shifted between the front surface and the back surface of the positive electrode active material 2.
- the thickness of the insulating member 40 is small, there is a possibility that sufficient insulation cannot be ensured. Therefore, the thickness is preferably 10 ⁇ m or more. Moreover, since the effect which suppresses the increase in the thickness of the electrode laminated body by this invention is not fully exhibited when the thickness of the insulating member 40 is too large, the insulating member 40 is more than the thickness of the flat part 2b of the positive electrode active material 2. The smaller one is better. Preferably, the thickness of the insulating member 40 is 90% or less of the thickness of the flat part 2b of the positive electrode active material 2, more preferably 60% or less of the thickness of the flat part 2b.
- the positive electrode current collector 3 is cut and divided along a cutting line 90 shown by a broken line in FIG. 6a, and the desired size shown in FIG. 6b is obtained.
- a positive electrode 1 is obtained.
- the cutting line 90 is a virtual line and is not actually formed.
- FIG. 7 shows a state in which the negative electrode active material 7 is intermittently applied to the surface of a large-area positive electrode current collector 8 for manufacturing a plurality of negative electrodes (negative electrode sheets) 6.
- At least a part of the outer edge portion of each negative electrode active material 7 (specifically, the outer edge portion on the side to which the negative electrode terminal 16 is connected later) has an inclined portion 7a that gradually decreases in thickness toward the outside. Is formed.
- the inclined part 7c may be provided in the outer edge part on the opposite side to the inclined part 7a, the inclined part 7c may not be provided.
- the insulating member 40 is not provided on the negative electrode current collector 8 and the negative electrode active material 7. As shown in FIG.
- the negative electrode active material 7 is similarly formed on both the front and back surfaces of the negative electrode current collector 8.
- An uncoated portion where the negative electrode active material 7 is not formed is provided on the outer edge portion of the negative electrode 6 opposite to the inclined portion 7a. This uncoated portion becomes a negative electrode tab to which the negative electrode terminal 16 is connected, but is not shown in FIGS.
- the negative electrode current collector 8 is cut and divided along a cutting line 91 shown by a broken line in FIG. 8a, and the desired size shown in FIG. 8b is obtained.
- a negative electrode 6 is obtained.
- the cutting line 90 is a virtual line and is not actually formed.
- the positive electrode 1 shown in FIG. 6b and the negative electrode 6 shown in FIG. 8b, which are formed in this manner, are alternately stacked via the separator 20, and the positive electrode terminal 11 and the negative electrode terminal 16 are connected to each other in FIG.
- the electrode stack shown is formed. It is also possible to form the electrode laminate shown in FIG. 3 in the same process as described above except that the positive electrode active material 2 is formed so as to provide the stepped portion 2c in the inclined portion 2a.
- the electrode laminate is housed in an outer container made of the flexible film 30 together with the electrolytic solution and sealed, whereby the secondary battery 100 shown in FIG. 1 is formed.
- one end portion 40a of the insulating member 40 is positioned on the slope portion 2a (which may be the step portion 2c) of the positive electrode active material 2, and the negative electrode It faces the inclined portion 7a of the active material 7.
- the increase in thickness due to the insulating member 40 formed so as to cover the boundary portion 4a between the coated portion and the uncoated portion of the positive electrode 1 is the inclined portion 2a (stepped portion) of the positive electrode active material 2. 2c), the thickness of the negative electrode active material 7 is absorbed (cancelled) by the decrease in thickness due to the inclined portion 7a, and the electrode stack is not partially thickened. Can be held evenly, and deterioration in quality such as variation in electrical characteristics and deterioration in cycle characteristics can be suppressed.
- one end portion 40a of the insulating member 40 is a portion where the total thickness of the positive electrode active material 2 and the thickness of the insulating member 40 in a portion where the end portion 40a is located is a portion other than the inclined portion 2a of the positive electrode active material 2 ( It is preferable to be located in a portion that is equal to or less than the thickness of the flat portion 2b). Thereby, it is possible to reduce the thickness of the single positive electrode 1 by a thickness corresponding to approximately two of the insulating members 40 from the conventional configuration.
- the thickness of the insulating member 40, the thickness of the positive electrode active material 2 in the portion where the end portion 40a of the insulating member 40 is located, and the portion facing the end portion 40a of the insulating member 40 The total thickness of the negative electrode active material 7 is preferably equal to or less than the total of the thickness of the flat portion 2 b of the positive electrode active material 2 and the thickness of the flat portion 7 b of the negative electrode active material 7.
- the insulating member 40 in which one end portion 40a is located on the inclined portion 2a of the positive electrode active material 2 has a total thickness of the insulating member 40 and the thickness of the positive electrode active material 2 in the portion where the end portion 40a is located,
- the positive electrode active material 2 is preferably formed so as not to be thicker than the flat portion 2b. However, even if the thickness is larger than the flat portion 2b due to manufacturing variations, the negative electrode active material 7 This is because the decrease in thickness due to the inclined portion 7a can absorb (cancel) the increase in thickness due to manufacturing variations of the positive electrode 1.
- the positive electrode active material 2 is gently curved in the single-side coated portion of the positive electrode 1 to suppress the increase in thickness due to the insulating member 40 and to make it gentle. Is preferably shifted from the boundary portion 4a of the surface toward the single-side applied portion.
- the deviation amount is 5 times or more the thickness of the insulating member 40, and more preferably, the deviation amount is 10 times or more the thickness of the insulating member 40.
- the transition position 7 d between the flat portion 7 b and the inclined portion 7 a of the negative electrode active material 7 is in the insulating member 40 positioned on the inclined portion 2 a of the positive electrode active material 2 on the surface of the positive electrode current collector 3. It is comprised so that it may be located in the center part side (left side of FIG. 2) rather than the edge part 40a, ie, the flat part 2b side of the positive electrode active material 2.
- the transition position 4b between the flat portion 2b and the inclined portion 2a of the positive electrode active material 2 on the surface side and the transition position 7d between the flat portion 7b and the inclined portion 7a of the negative electrode active material 7 are seen in a plan view. There is a portion arranged so as to almost coincide with each other.
- the double-sided coated part of the negative electrode 6 is cut and terminated at the position facing the double-sided uncoated part (positive electrode tab) of the positive electrode 1 (terminal part 7e), as shown in FIG.
- the negative electrode active material 8 exists in the front and back of the negative electrode collector 8, and it has the structure which does not have a single-sided coating part and a double-sided uncoated part.
- the double-side uncoated portion exists on the negative electrode 6 at a position facing the double-side uncoated portion (positive electrode tab) of the positive electrode 1.
- the planar position of the boundary between the coated portion and the uncoated portion on the front and back of the negative electrode current collector 7 may not be shifted.
- the insulating member 40 may be provided by shifting the planar position of the boundary portion between the front and back of the negative electrode current collector 7 as in the positive electrode 1. In that case, it is preferable that the one end part 40a of the insulating member 40 is located on the inclined surface 7a.
- the boundary portion between the coated portion and the uncoated portion is planarly separated between the front surface and the back surface of the negative electrode current collector 8, in other words, the double-side coated portion, the single-side coated portion, and the double-side uncoated portion in the longitudinal direction.
- the configuration in which they are arranged side by side and the configuration in which an insulating member is provided at the boundary may be employed only for the positive electrode 1, may be employed only for the negative electrode 6, or may be employed for both the positive electrode 1 and the negative electrode 6.
- each member in the present invention means an average value of three or more points when measured at an arbitrary place unless otherwise specified.
- the positions of the flat portions 2b and 7b and the inclined portions 2a and 7a of the positive electrode active material 2 and the negative electrode active material 7 are not limited to the configurations shown in FIGS. Some of such modifications are listed in each embodiment described later.
- Example 1 A lithium ion secondary battery was manufactured according to the manufacturing method described with reference to FIGS.
- a mixed active material of LiMn 2 O 4 and LiNi 0.8 Co 0.1 Al 0.1 O 2 was used as a positive electrode active material
- carbon black was used as a conductive agent
- PVdF was used as a binder
- these mixtures were dispersed in an organic solvent.
- a slurry was prepared. As shown in FIG. 4, this slurry was intermittently applied to one surface of a positive electrode current collector 3 mainly composed of aluminum having a thickness of 20 ⁇ m and dried to form a positive electrode active material 2 having a thickness of 80 ⁇ m. .
- the positive electrode active material 2 By applying the positive electrode active material 2 intermittently, the application portion and the non-application portion of the positive electrode active material 2 were alternately present along the longitudinal direction of the positive electrode current collector 2.
- a positive electrode active material having a thickness of 80 ⁇ m is formed so that the boundary portion 4 a between the coated portion and the non-coated portion of the positive electrode active material 2 is shifted inward by 2 mm from the boundary portion 4 a of one surface. Material 2 was formed.
- the application part of the positive electrode active material 2 has a flat part 2b and an inclined part 2a, and the inclined part 2a is formed by applying so that the thickness decreases from the flat part 2b toward the unapplied part.
- the method for applying the active material on the current collector will be described.
- an apparatus for applying the active material it is possible to use a doctor blade, a die coater, a gravure coater, or an apparatus for performing various application methods such as a transfer method and a vapor deposition method.
- the active material application method using a die coater is roughly divided into a continuous application method in which an active material is continuously formed along the longitudinal direction of a long current collector, and an active material application method along the longitudinal direction of the current collector.
- There are two types of intermittent application methods in which the application part and the non-application part are alternately and repeatedly formed.
- FIG. 9 is a diagram showing an example of the configuration of a die coater that performs intermittent application.
- a slurry flow path of a die coater that performs intermittent coating includes a die head 12, a coating valve 13 connected to the die head 12, a pump 14, and a tank 15 that stores the slurry 10.
- a return valve 17 is provided between the tank 15 and the application valve 13.
- the motor valve can accurately change the open / close state of the valve even during application of the slurry. Therefore, by combining the application valve 13 composed of a motor valve with the operation of the return valve 17 to control the flow path of the slurry, the boundary portion between the active material application portion and the non-application portion can be formed in a desired shape. Is possible.
- an active material by performing continuous coating using a die coater schematically shown in FIGS. 10a and 10b.
- a die coater schematically shown in FIGS. 10a and 10b.
- shims 18b having tapered portions or step portions 18c whose thickness decreases toward the central portion of the discharge port 18a are provided.
- the active material can be formed so that a stepped portion or an inclined portion is formed at the end of the coating portion.
- a polypropylene insulating tape (insulating member) 40 having a thickness of 30 ⁇ m is pasted so as to cover the boundary portion 4a as shown in FIG. It was.
- the end portion 40a of the insulating tape 40 provided so as to cover the boundary portion 4a between the coated portion (double-side coated portion) and the uncoated portion (single-side coated portion) on one surface of the positive electrode active material 2 has the positive electrode active portion. It formed so that it might be located on the inclination part 2a of the substance 2.
- the insulating tape 40 provided so as to cover the boundary portion 4a on the other surface of the positive electrode active material 2 has an end portion 40a located on the inclined portion 2a of the positive electrode active material 2 on the other surface, and the boundary of one surface
- the film was pasted so as to cover a part of the boundary portion 4a on the other surface and the positive electrode current collector 3 which are shifted by 1 mm inward or outward from the portion 4a. And as shown to FIG. 6a, 6b, it cut
- FIG. 6a, 6b it cut
- ⁇ Negative electrode> As the negative electrode active material 7, a graphite whose surface was coated with amorphous was used, PVdF was used as a binder, and a slurry in which these mixtures were dispersed in an organic solvent was prepared. As shown in FIG. 7, the slurry was intermittently applied to a 15 ⁇ m thick copper foil, which is the negative electrode current collector 8, and dried. A negative electrode roll provided with an application part was created.
- the specific application method of the negative electrode active material 7 is the same as the application method of the positive electrode active material 2 described above, and the continuous application using the die coater shown in FIGS. 10a and 10b is possible even in the intermittent application using the die coater shown in FIG. Application may be sufficient.
- the negative electrode active material 7 has a flat part 7b and an inclined part 7a, and the inclined part 7a was formed by coating so that the thickness decreases from the flat part 7b toward the outer edge part. And as shown to FIG. 8a, 8b, it cut
- the negative electrode 6 has a negative electrode tab that is an uncoated portion of the negative electrode active material 7 at a position that does not face the positive electrode tab, and a position 7e that is opposite to the positive electrode tab and has the negative electrode active material 7 on both sides. , The negative electrode current collector 8 is cut.
- the flat portion 7b of the negative electrode active material 7 has a thickness of 55 ⁇ m on one side, and no insulating member is provided at the boundary between the coated portion and the uncoated portion of the negative electrode 6.
- the obtained positive electrode 20 and negative electrode 21 are laminated via a separator 20 made of polypropylene having a thickness of 25 ⁇ m, and the negative electrode terminal 16 and the positive electrode terminal 11 are attached thereto and accommodated in an exterior container made of a flexible film 30.
- a laminated battery having a thickness of 8 mm was obtained.
- the transition position 7 d between the flat portion 7 b and the inclined portion 7 a of the negative electrode active material 7 at a position facing the positive electrode tab is the positive electrode active material 2 on one surface of the positive electrode 1. It was formed so that it might be located in the flat part 2b side of the positive electrode active material 2 rather than the edge part 40a of the insulating tape 40 provided in this inclination part 2a.
- the transition position 4b between the flat portion 2b and the inclined portion 2a of the positive electrode active material 2 and the transition position 7d between the flat portion 7b and the inclined portion 7a of the negative electrode active material 7 are viewed in a plan view. It arrange
- Example 2 Using a mixture containing LiMn 2 O 4 as an active material, carbon black as a conductive agent, and PVdF as a binder, a positive electrode active material 2 having a thickness of 35 ⁇ m is formed on each side of the positive electrode current collector 3. did. Further, a negative electrode active material 7 having a thickness of 35 ⁇ m made of non-graphitizable carbon was formed on one side of the negative electrode current collector 8. Other conditions such as the positions where the active materials 2 and 7 and the insulating member 40 were formed were the same as in Example 1 to obtain a stacked battery having a thickness of 3 mm.
- Example 3 The end portion 40 a of the insulating member 40 on the positive electrode active material 2 of the positive electrode current collector 3 is set to 0 inside or outside from the end portion 4 a of the positive electrode active material 2 located on the opposite surface through the positive electrode current collector 3.
- a laminated battery was obtained in the same manner as in Example 1 except that the arrangement was shifted by 3 mm. The thickness of the obtained laminated battery was 8.1 mm.
- Example 4 is arranged so that the boundary part 4a between the coated part and the non-coated part of the positive electrode active material 2 on the other surface of the positive electrode current collector 3 is shifted inward by 1 mm from the boundary part 4a of one surface. In the same manner, a stacked battery was obtained. The thickness of the obtained laminated battery was 8.1 mm.
- Example 5 In this embodiment, as shown in FIG. 11, the position of the inclined portion 7a of the negative electrode 6 is different from the example shown in FIG. That is, in the negative electrode 6, the transition position 7 d between the flat portion 7 b and the inclined portion 7 a of the negative electrode active material 7 at the position facing the positive electrode tab (both uncoated portions of the positive electrode 1) is the positive electrode active on the other surface of the positive electrode 1.
- the transition position 7d between the flat portion 7b and the inclined portion 7a of the negative electrode active material 7 is arranged so as to be different between the front and back of the negative electrode current collector 8, and
- the respective transition positions 7d are arranged so as to coincide with the transition positions 4b of the flat portion 2b and the inclined portion 2a of the positive electrode active material 2 directly opposed to the surface in plan view.
- the transition position 7d between the flat portion 7b and the inclined portion 7a of the negative electrode active material 7 on the surface of the negative electrode current collector 8 corresponds to the flat portion 2b and the inclined portion 2a of the positive electrode active material 2 on the back surface of the positive electrode current collector 3.
- the transition position 7b between the flat portion 7b and the inclined portion 7a of the negative electrode active material 7 on the back surface of the negative electrode current collector 8 is the same as the transition position 4b of the positive electrode current collector 3.
- the transition position 4b between the flat portion 2b and the inclined portion 2a of the positive electrode active material 2 on the surface is in a position that coincides in plan view. Otherwise, a laminated battery was obtained in the same manner as in Example 1.
- Example 7 In this example, as shown in FIG. 13, the transition position 7d between the flat portion 7b and the inclined portion 7a of the negative electrode active material 7 is arranged on the front and back of the negative electrode current collector 8, and the transition is performed.
- the position 7d was arranged so as to coincide with the transition position 4b between the flat portion 2b and the inclined portion 2a of the positive electrode active material 2 on both the front and back surfaces of the positive electrode current collector 8 when viewed in plan.
- transition position 7d between the flat portion 7b and the inclined portion 7a of the negative electrode active material 7 on both the front and back surfaces of the negative electrode current collector 8, and the flat portion 2b and the inclined portion of the positive electrode active material 2 on the front and back surfaces of the positive electrode current collector 3 The transition position 4b from 2a is in a position where they all coincide in plan view. Therefore, the boundary portion 4 a between the coated portion and the uncoated portion of the positive electrode active material 3 is not shifted between the front and back of the positive electrode current collector 3. Otherwise, a laminated battery was obtained in the same manner as in Example 1.
- the positive electrode active material 2 and the negative electrode active material 7 were each formed as a layer having a uniform thickness, and had a configuration having only a flat portion and no inclined portion. Furthermore, the end part 4 a of the application part of the positive electrode active material 2 and the end part 40 a of the insulating sheet 40 were arranged without being shifted on the front and back of the positive electrode current collector 3. Other than that was carried out similarly to Example 1, and obtained the laminated battery. The thickness of this laminated battery was 8.5 mm.
- the positive electrode active material 2 and the negative electrode active material 7 were each formed as a layer having a uniform thickness, and had a configuration having only a flat portion and no inclined portion. Furthermore, the end part 4 a of the application part of the positive electrode active material 2 and the end part 40 a of the insulating sheet 40 were arranged without being shifted on the front and back of the positive electrode current collector 3. Otherwise, a laminated battery was obtained in the same manner as in Example 2. The thickness of this stacked battery was 3.4 mm.
- the multilayer batteries of Examples 1 to 7 could obtain very stable discharge capacity and cycle characteristics. It was confirmed that the batteries of Comparative Examples 1 and 2 were unstable in discharge capacity and cycle characteristics as compared with the batteries of Examples 1 to 7. This is because in the stacked battery, the thickness of the portion where the insulating member 40 is located is suppressed from becoming larger than that of the other portions, so that the stacked battery can be held while being evenly pressurized. Thus, the battery characteristics are considered stable.
- the inclination angle of the inclined portion 7 a of the negative electrode active material 7 is not necessarily constant, and the capacity of the negative electrode 6 does not become smaller than that of the positive electrode 1 in consideration of the capacity balance with the opposing positive electrode 1. If it is, it can be set arbitrarily.
- the positive electrode active material 2 and the negative electrode active material 7 are formed by intermittent application (intermittent application), but as shown in FIGS. 14 to 16b, gaps are formed across a plurality of electrode formation portions.
- the active material is formed by continuous application, it can be stored as an electrode roll as shown in FIG. 17 before cutting along the cutting line 90 in FIG. 16a. In that case, the portion where the insulating member 40 is disposed Therefore, the quality as an electrode can be improved.
- the present invention is useful for the production of an electrode of a lithium ion secondary battery and the production of a lithium ion secondary battery using the electrode, but it is also effective when applied to a secondary battery other than a lithium ion battery.
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Abstract
Description
図4~8bを参照して説明した製造方法に従って、リチウムイオン二次電池を製造した 。
まず、正極活物質としてLiMn2O4とLiNi0.8Co0.1Al0.1O2との混合活物質を用い、導電剤としてカーボンブラック、バインダーとしてPVdFを用い、これらの合剤を有機溶媒中に分散したスラリーを準備した。このスラリーを、図4に示すように厚さ20μmのアルミニウムを主成分とする正極集電体3の一方の面に間欠的に塗布して乾燥し、厚さ80μmの正極活物質2を形成した。正極活物質2を間欠的に塗布することで、正極活物質2の塗布部と未塗布部が、正極集電体2の長手方向に沿って交互に存在する状態にした。正極集電体3の他方の面には、正極活物質2の塗布部と未塗布部の境界部分4aが、一方の面の境界部分4aから2mm内側にずれるように、厚さ80μmの正極活物質2を形成した。正極活物質2の塗布部は平坦部2bと傾斜部2aを有し、傾斜部2aは、平坦部2bから未塗布部に向かって厚さが減少するように塗布することによって形成された。
負極活物質7として表面を非晶質で被覆した黒鉛を用い、バインダーとしてPVdFを用い、これらの合剤を有機溶媒中に分散したスラリーを準備した。図7に示すように、スラリーを、負極集電体8である厚さ15μmの銅箔に間欠的に塗布して乾燥し、正極1と同様に負極活物質7の塗布部と、塗布しない未塗布部とを備える負極ロールを作成した。負極活物質7の具体的な塗布方法は、前記した正極活物質2の塗布方法と同様であり、図9に示すダイコータを用いる間欠塗布であっても、図10a,10bに示すダイコータを用いる連続塗布であってもよい。
得られた正極20と負極21とを、厚さ25μmのポリプロピレンからなるセパレータ20を介して積層し、これに負極端子16と正極端子11を取り付け、可撓性フィルム30からなる外装容器に収容することで、厚さ8mmの積層型電池を得た。
活物質であるLiMn2O4と、導電剤であるカーボンブラックと、バインダーであるPVdFとを含む合剤を用いて、正極集電体3の片側ごとに厚さ35μmの正極活物質2を形成した。また、負極集電体8の片側ごとに、難黒鉛化炭素からなる厚さ35μmの負極活物質7を形成した。活物質2,7や絶縁部材40の形成位置など、その他の条件は実施例1と同様にし、厚さ3mmの積層型電池を得た。
正極集電体3の正極活物質2上の絶縁部材40の端部40aを、正極集電体3を介して反対側の面に位置する正極活物質2の端部4aから内側または外側に0.3mmずらして配置し、それ以外は実施例1と同様にして積層型電池を得た。得られた積層型電池の厚さは8.1mmであった。
正極集電体3の他方の面の正極活物質2の塗布部と未塗布部の境界部分4aが、一方の面の境界部分4aから1mm内側にずれるように配置し、それ以外は実施例3と同様にして積層型電池を得た。得られた積層型電池の厚さは8.1mmであった。
本実施例では、図11に示すように、負極6の傾斜部7aの位置が、図2に示す例とは異なっている。すなわち、負極6における、正極タブ(正極1の両面未塗布部)に対向する位置の負極活物質7の平坦部7bと傾斜部7aとの変移位置7dが、正極1の他方の面における正極活物質2の傾斜部2a上の絶縁テープ40の端部40aよりも平坦部2b側であって、かつ正極1の一方の面における正極活物質2の傾斜部2a上の絶縁テープ40の端部40aよりも傾斜部2a側に位置している。それ以外は、実施例1と同様にして積層型電池を得た。
本実施例では、図12に示すように、負極活物質7の平坦部7bと傾斜部7aとの変移位置7dが、負極集電体8の表裏で異なる位置になるように配置し、表裏のそれぞれの変移位置7dが、平面的に見て、その面に直接対向する正極活物質2の平坦部2bと傾斜部2aとの変移位置4bとそれぞれ一致するように配置した。すなわち、負極集電体8の表面における負極活物質7の平坦部7bと傾斜部7aとの変移位置7dが、正極集電体3の裏面における正極活物質2の平坦部2bと傾斜部2aとの変移位置4bと、平面的に見て一致する位置にあり、負極集電体8の裏面における負極活物質7の平坦部7bと傾斜部7aとの変移位置7dが、正極集電体3の表面における正極活物質2の平坦部2bと傾斜部2aとの変移位置4bと、平面的に見て一致する位置にある。それ以外は、実施例1と同様にして積層型電池を得た。
本実施例は、図13に示すように、負極活物質7の平坦部7bと傾斜部7aとの変移位置7dが、負極集電体8の表裏で同じ位置になるように配置し、その変移位置7dが、平面的に見て正極集電体8の表裏両面の正極活物質2の平坦部2bと傾斜部2aとの変移位置4bと一致するように配置した。すなわち、負極集電体8の表裏両面における負極活物質7の平坦部7bと傾斜部7aとの変移位置7dと、正極集電体3の表裏両面における正極活物質2の平坦部2bと傾斜部2aとの変移位置4bが、平面的に見て全て一致する位置にある。従って、正極集電体3の表裏で正極活物質3の塗布部と未塗布部との境界部分4aがずれていない。それ以外は、実施例1と同様にして積層型電池を得た。
正極活物質2と負極活物質7をそれぞれ厚さが均一な層として形成し、平坦部のみで傾斜部のない構成とした。さらに、正極活物質2の塗布部の端部4aおよび絶縁シート40の端部40aを、正極集電体3の表裏でずらさずに配置した。それ以外は実施例1と同様にして積層型電池を得た。この積層型電池の厚さは8.5mmであった。
正極活物質2と負極活物質7をそれぞれ厚さが均一な層として形成し、平坦部のみで傾斜部のない構成とした。さらに、正極活物質2の塗布部の端部4aおよび絶縁シート40の端部40aを、正極集電体3の表裏でずらさずに配置した。それ以外は実施例2と同様にして積層型電池を得た。この積層型電池の厚さは3.4mmであった。
このようにして得た積層型電池の放電容量やサイクル特性を、各水準ともに10pずつ評価したところ、実施例1~7の積層型電池は非常に安定した放電容量とサイクル特性を得られることが確認され、比較例1~2の電池は実施例1~7の電池に比べて放電容量やサイクル特性が不安定であった。これは、積層型電池において、絶縁部材40が位置する部分の厚さがそれ以外の部分に比べて大きくなることを抑制したことで、積層型電池を均等に加圧しながら保持することが可能になり、電池特性が安定したと考えられる。
2 正極活物質
2a,7a 傾斜部
2c 段部
3 正極集電体
4a 境界部分
6 負極
7 負極活物質
8 負極集電体
20 セパレータ
40 絶縁部材
40a 一方の端部
40b 他方の端部
100 二次電池
Claims (7)
- 正極と負極とがセパレータを介して交互に積層された電池素子を含み、
前記正極と前記負極はそれぞれ、集電体と該集電体に塗布されている活物質とを含み、
前記集電体の各面には、前記活物質が塗布されている塗布部と、前記活物質が塗布されていない未塗布部とが設けられており、
前記活物質は、前記塗布部の外縁部の少なくとも一部に、厚さが減少する傾斜部または段部を有し、
前記正極の前記塗布部と前記未塗布部との境界部分を覆うように絶縁部材が配置されており、
前記正極の前記集電体に設けられている前記絶縁部材のうちのいずれか一方または両方の絶縁部材は、一方の端部が前記正極の前記活物質の前記傾斜面または段部の上に位置するとともに、前記負極の前記集電体の両面にそれぞれ形成されている前記活物質のうちのいずれか一方または両方の活物質の前記傾斜部または段部と対向しており、他方の端部は前記正極の前記未塗布部の上に位置している
二次電池。 - 前記負極の平坦部と前記傾斜部との変移位置が、前記セパレータを介して対向する前記正極の平坦部と前記傾斜部との変移位置、または前記傾斜部と対向する、請求項1に記載の二次電池。
- 前記絶縁部材の厚さと、前記絶縁部材の前記一方の端部が位置する部分における前記正極の前記活物質の厚さと、前記絶縁部材の前記一方の端部と対向する部分における前記負極の前記活物質の厚さとの合計が、前記正極の前記活物質の前記平坦部の厚さと前記負極の前記活物質の前記平坦部の厚さとの合計以下である、請求項1または2に記載の二次電池。
- 前記正極の前記集電体上に形成された前記活物質の層厚が25μm以上100μm以下であり、該集電体の一方の面における前記塗布部と前記未塗布部との境界部分と、該集電体の他方の面における前記塗布部と前記未塗布部との境界部分とは、平面的に1.5mm以上離れて位置している、請求項1から3のいずれか1項に記載の二次電池。
- 平面的に見て、前記正極の前記集電体の一方の面上に位置する前記絶縁部材の、前記塗布部側の端部と、前記集電体の他方の面における前記塗布部と前記未塗布部の境界部分との間の間隔が、該絶縁部材の平均厚さの5倍以上である、請求項1から4のいずれか1項に記載の二次電池。
- 前記絶縁部材の厚さは、該絶縁部材が部分的に覆っている前記正極の前記活物質の層厚の60%以下である、請求項1から5のいずれか1項に記載の二次電池。
- リチウムイオン二次電池である、請求項1から6のいずれか1項に記載の二次電池。
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