WO2014155971A1 - 非水電解質二次電池 - Google Patents
非水電解質二次電池 Download PDFInfo
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- WO2014155971A1 WO2014155971A1 PCT/JP2014/001073 JP2014001073W WO2014155971A1 WO 2014155971 A1 WO2014155971 A1 WO 2014155971A1 JP 2014001073 W JP2014001073 W JP 2014001073W WO 2014155971 A1 WO2014155971 A1 WO 2014155971A1
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- positive electrode
- negative electrode
- current collector
- active material
- electrode current
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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
- 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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
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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
- H01M10/06—Lead-acid accumulators
- H01M10/12—Construction or manufacture
- H01M10/125—Cells or batteries 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
- H01M10/24—Alkaline accumulators
- H01M10/28—Construction or manufacture
- H01M10/286—Cells or batteries with wound or folded electrodes
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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
Definitions
- the present invention relates to a non-aqueous electrolyte secondary battery.
- a positive electrode in which a positive electrode active material layer is formed on both sides of a positive electrode current collector and a negative electrode in which a negative electrode active material layer is formed on both sides of a negative electrode current collector are stacked via a separator,
- a wound type is used in which a battery element in which this is wound is housed in a battery can.
- Patent Document 1 discloses a positive electrode current collector exposed portion at both ends of a positive electrode and a negative electrode in a wound non-aqueous secondary battery. In addition, it is disclosed to provide a current collector facing surface in which the negative electrode current collector exposed portion is opposed. Although the positive electrode current collector exposed portion may be provided on one side of the positive electrode current collector, it is stated that a low resistance contact state between the metals is more surely provided on both sides.
- Patent Document 2 it may be insufficient to provide a current collector facing surface in which the positive electrode current collector exposed portion and the negative electrode current collector exposed portion are opposed to each of both ends of the positive electrode and the negative electrode.
- a current collector facing surface in which a positive electrode current collector exposed portion and a negative electrode current collector exposed portion are opposed to each other is also provided in an intermediate portion of the winding.
- a non-aqueous electrolyte secondary battery that has a simple configuration and can obtain a low resistance contact state between the positive electrode and the negative electrode even when the positive electrode and the negative electrode are short-circuited in the battery is desired.
- the nonaqueous electrolyte secondary battery according to the present invention includes a positive electrode in which a positive electrode active material layer is formed on both sides of a positive electrode current collector, and a negative electrode active material having a lower resistance than the positive electrode active material layer on both sides of the negative electrode current collector
- a non-aqueous electrolyte secondary battery in which a battery element in which a negative electrode having a layer formed thereon is wound with a separator interposed therebetween is accommodated in a battery can, and the positive electrode is wound around the intermediate layer portion of the winding.
- the negative electrode of the portion facing the positive electrode current collector exposed at the intermediate layer portion has a positive electrode current collector exposed portion where the positive electrode current collector is exposed over a length of one or more turns.
- a negative electrode active material layer laminated on the current collector is disposed.
- the nonaqueous electrolyte secondary battery according to the present invention includes a positive electrode in which a positive electrode active material layer is formed on both sides of a positive electrode current collector, and a negative electrode active material having a lower resistance than the positive electrode active material layer on both sides of the negative electrode current collector
- An active material layer separation portion that suppresses diffusion of ions contributing to electromotive force through the active material layer is provided.
- the negative electrode current collector exposed portion facing the positive electrode current collector exposed portion is unnecessary. Therefore, with a simple configuration, a low resistance contact state between the positive electrode and the negative electrode can be obtained even when the positive electrode and the negative electrode are short-circuited in the battery.
- FIG. 2 it is a figure which shows a normal structure about lamination
- FIG. 2 it is a figure which shows a safety structure about lamination
- FIG. 1 is a diagram showing the internal structure of a nonaqueous electrolyte secondary battery 1 cut away.
- the non-aqueous electrolyte secondary battery 1 includes a battery element 2 in which a positive electrode 3 and a negative electrode 4 are stacked with a separator 5 interposed between them, and a non-aqueous electrolyte 6 is filled between those wound in a cylindrical shape. It is housed inside.
- the battery can 7 is a cylindrical container having a bottom part and an upper part opening.
- the battery can 7 may be formed by molding a conductive material such as metal into a predetermined shape.
- a conductive material such as metal into a predetermined shape.
- iron or the like can be used as the conductive material used for the battery can 7, iron or the like can be used. It is preferable to subject the surface of the iron material to a conductive treatment such as nickel plating.
- the extraction of the positive electrode 3 is performed as follows.
- the positive electrode 3 is connected to a positive electrode lead 8 of a conductor, and the positive electrode lead 8 is connected to a sealing material 9 that covers the upper opening of the battery can 7.
- the sealing material 9 becomes a cap 10 having a convex shape at the center, and serves as a positive electrode terminal of the nonaqueous electrolyte secondary battery 1.
- the safety valve 11 is provided in the vicinity of the positive electrode terminal. When the pressure of the gas generated by the electrochemical reaction performed inside the battery can 7 exceeds a predetermined threshold pressure, the safety valve 11 is exhausted from the inside of the battery can 7 to the outside. It is a mechanism to release.
- the gasket 12 is a member for gathering the ends of the positive electrode lead 8, the sealing material 9, and the safety valve 11 together and fixing them to the edge of the upper opening of the battery can 7.
- an elastic metal ring, rubber seal ring, or the like can be used as the gasket 12.
- the sealing material 9 and the battery can 7 are integrated while maintaining liquid tightness and air tightness.
- the extraction of the negative electrode 4 is performed as follows.
- An insulating plate 13 is disposed at the bottom of the battery can 7 so that the positive electrode 3 and the negative electrode 4 are electrically insulated from the battery can 7.
- a negative electrode lead (not shown) drawn from the negative electrode 4 bypasses the insulating plate 13 and is connected to the bottom of the battery can 7, whereby the conductor surface of the battery can 7 is connected to the nonaqueous electrolyte secondary battery 1. It becomes the negative terminal.
- the pipe-shaped core 14 is a member that becomes a winding shaft when the positive electrode 3, the negative electrode 4, and the separator 5 are stacked and wound into a cylindrical shape. Further, the pipe-shaped core 14 has a function of a flow path that guides gas toward the safety valve 11 when the internal pressure of the battery can 7 increases, and at the same time, when a compressive force is applied from the outside of the battery can 7.
- the rotating battery element 2 has a function of compressing and energizing between the pipe-shaped core 14 and the inner wall of the battery can 7.
- the battery can 7 is the negative electrode terminal and the cap 10 is the positive electrode terminal, but this may be reversed depending on the specifications of the nonaqueous electrolyte secondary battery 1. In that case, the battery can 7 serves as a positive terminal and the cap 10 serves as a negative terminal.
- FIG. 2 is a cross-sectional view of the battery element 2 taken along a plane perpendicular to the axial direction.
- the battery element 2 is accommodated in a battery can 7, and a positive electrode 3, a negative electrode 4, and a separator 5 are stacked around a pipe-shaped core 14, wound in a cylindrical shape, and filled with a nonaqueous electrolyte 6.
- N 1, N from the inner peripheral end side toward the outer peripheral end side.
- the number of windings is an example for explanation and may be other number of windings.
- the positive electrode 3 has a structure in which positive electrode active material layers 21 and 22 are formed on both surfaces of the positive electrode current collector 20, respectively.
- the negative electrode 4 has a structure in which negative electrode active material layers 25 and 26 are formed on both surfaces of a negative electrode current collector 24, respectively.
- the separator 5 is disposed between the positive electrode 3 and the negative electrode 4. The positive electrode 3, the negative electrode 4, and the separator 5 are immersed in the nonaqueous electrolyte 6.
- the positive electrode current collector 20 is a conductive foil-like film.
- a metal foil having an appropriate thickness can be used.
- the material of the metal foil is preferably selected from aluminum, titanium, stainless steel and the like.
- a thickness of about 5 to about 100 ⁇ m can be used.
- an aluminum foil having a thickness of about 8 to about 50 ⁇ m can be used.
- the thickness is preferably about 10 to about 30 ⁇ m.
- Li composite metal oxide can be used as the positive electrode active material constituting the positive electrode active material layers 21 and 22.
- LiCoO X Li X Ni Y Co (1-Y) O, and Li X MnO like.
- Li compounds such as lithium hydroxide, lithium oxide, lithium carbonate, lithium nitrate, metal oxide, metal hydroxide, metal carbonate, metal nitrate, etc., and further, if desired If so, it can be easily obtained by subjecting it to a firing reaction with another metal compound.
- the thickness of the positive electrode active material layers 21 and 22 is about 30 to about 300 ⁇ m per side.
- the thickness is preferably about 50 to about 200 ⁇ m.
- the negative electrode current collector 24 is a conductive foil-like film.
- a metal foil having an appropriate thickness can be used.
- the material of the metal foil is preferably selected from copper, nickel, stainless steel, and the like.
- a thickness of about 6 to about 50 ⁇ m can be used.
- a copper foil having a thickness of about 6 to about 50 ⁇ m can be used.
- the thickness is preferably about 8 to about 25 ⁇ m.
- the negative electrode active material layers 25 and 26 include, for example, a carbonaceous material.
- the carbonaceous material is preferably selected from coke, graphite, amorphous carbon and the like.
- the shape of the carbonaceous material may be any of a crushed shape, a scale shape, and a spherical shape.
- the thickness of the negative electrode active material layers 25 and 26 can be about 30 to about 300 ⁇ m. The thickness is preferably about 50 to about 200 ⁇ m.
- the positive electrode current collector 20 that is a metal foil.
- the negative electrode current collector 24 has the lowest resistance value
- the positive electrode active material layers 21 and 22 formed of a composite metal oxide, which is a kind of ceramic have a large resistance value at each stage.
- the specific resistance value per unit area varies depending on the material and thickness, but roughly speaking, assuming that the resistance values of the positive electrode current collector 20 and the negative electrode current collector 24 are 1, the negative electrode active material layer 25, 26 is about 10, and the positive electrode active material layers 21 and 22 are about 1,000.
- the separator 5 is a film made of an ion permeable material.
- the ion-permeable material is not particularly limited, but is preferably selected from a woven fabric, a nonwoven fabric, a glass woven fabric, and a microporous membrane made of a synthetic resin.
- a microporous membrane made of synthetic resin a polyolefin microporous membrane can be used.
- the melting point of the separator 5 is 100 ° C. or higher, preferably about 100 to about 200 ° C.
- the thickness of the separator 5 may be set appropriately, but may be, for example, about 5 to 200 ⁇ m.
- the positive electrode 3 has positive electrode current collector exposed portions 30 and 31 where the positive electrode current collector 20 is exposed without the positive electrode active material layers 21 and 22 being disposed on both sides of the positive electrode current collector 20.
- the negative electrode 4 has a structure in which negative electrode active material layers 25 and 26 are formed on both surfaces of a negative electrode current collector 24, respectively, as in the normal structure.
- a slit is provided as an active material layer separation portion that suppresses diffusion of ions contributing to electromotive force through the negative electrode active material layers 25 and 26.
- the separator 5 and the nonaqueous electrolyte 6 have the same contents as in the case of the normal structure.
- the positive electrode current collector exposed portions 30 and 31 are one turn of the battery element 2 as a safety structure. This is a minimum amount of winding, and the positive electrode current collector exposed portions 30 and 31 may be provided at both ends of the battery element 2 and the intermediate layer portion over a length of one or more turns of the winding. preferable.
- FIG. 5 is a developed view of winding of the positive electrode 3, the negative electrode 4, and the separator 5 constituting the battery element 2.
- the battery element 2 is formed by laminating one positive electrode 3, one negative electrode 4, and two separators 5 and winding them around a pipe-shaped core 14.
- FIG. It is a figure which shows a mode that the one part lamination
- FIG.5 (b) (c) is a figure which shows a mode that the winding was unwound and it expand
- the positive electrode 3 and the negative electrode 4 are laminated and wound.
- the inner peripheral surface of the negative electrode 4 faces the outer peripheral surface of the positive electrode 3, and the outer peripheral surface of the negative electrode 4 faces the inner peripheral surface of the positive electrode 3.
- the positive electrode active material layers 21 and 22 are arranged on the innermost periphery of the positive electrode 3, and the negative electrode active material layer on the outermost periphery of the negative electrode 4 accordingly.
- An example in which 25 and 26 are not arranged is shown. This is an example for explaining the positional deviation in winding of the battery element 2, and may have a configuration other than this regarding the innermost circumference and the outermost circumference.
- the outer peripheral end of the outer peripheral surface of the positive electrode 3 and the outer peripheral end of the inner peripheral surface of the negative electrode 4 are aligned and wound, and this is developed on one plane.
- the outer peripheral surface of the positive electrode 3 faces the inner peripheral surface of the negative electrode 4
- the outer peripheral surface of the negative electrode 4 faces the inner peripheral surface of the positive electrode 3
- winding is performed. Since there is a difference between the inner and outer circumferences of the winding, the outer circumferential surface of the negative electrode 4 having the same number of windings N faces the inner circumferential surface of the positive electrode 3 at one winding number N.
- the inner and outer peripheral surfaces of the negative electrode 4 having the number of turns N-1 face each other on the outer peripheral surface.
- FIG. 5A shows the negative electrode 4 facing the outer peripheral surface of the positive electrode 3 on the lower side of the positive electrode 3 on the paper surface with the positive electrode 3 as a reference. Since the outer peripheral end of the positive electrode 3 and the outer peripheral end of the negative electrode 4 are aligned, the positive electrode 3 and the negative electrode 4 facing the outer peripheral surface of the positive electrode 3 face each other with the same number of turns N.
- the negative electrode 4 facing the inner peripheral surface of the positive electrode 3 is shown above the positive electrode 3 on the paper surface with the positive electrode 3 as a reference.
- the negative electrode 4 facing the side surface is opposed to N with the number of windings shifted by one.
- FIG. 5B is a view as seen from the outer peripheral side of the positive electrode 3 in FIG. 5A, and shows the negative electrode active material layer 25 that is the outer peripheral surface of the negative electrode 4.
- FIG. 5C is a view from the inner peripheral side of the positive electrode 3 in FIG. 5A, and shows the negative electrode active material layer 26 that is the inner peripheral surface of the negative electrode 4.
- the negative electrode tab 15 is omitted.
- the negative electrode 4 is provided with negative electrode active material layers 25 and 26 on both surfaces of the negative electrode current collector 24, respectively, except for the portion where the slit 40 is provided.
- the slit 40 when the negative electrode active material layers 25 and 26 are present at the positions facing the positive electrode current collector exposed portions 30 and 31, lithium ions that have moved from the positive electrode 3 to the negative electrode 4 through the nonaqueous electrolyte 6 are collected.
- This is an active material layer separating portion for preventing diffusion to the negative electrode active material layers 25 and 26 located opposite to the body exposed portions 30 and 31. Since lithium ions are ions that contribute to the electromotive force, if they diffuse into the negative electrode active material layers 25 and 26 located opposite to the positive electrode current collector exposed portions 30 and 31, they cannot contribute to the electromotive force. In the water electrolyte secondary battery 1, the irreversible capacity increases.
- the slit 40 is separated from the exposed ends of the positive electrode current collector exposed portions 30 and 31 by a predetermined overhang amount 41 so that the negative electrode active material layers 25 and 26 extend in the width direction perpendicular to the longitudinal direction. Provided to separate across. In this way, the negative electrode 4 in the portion facing the positive electrode current collector 20 is provided with the negative electrode active material layers 25 and 26 laminated on the negative electrode current collector 24.
- FIG. 5 there are three positive electrode current collector exposed portions 30 and 31, but as described above, the position of the negative electrode 4 facing the positive electrode current collector exposed portion 30 and the positive electrode current collector exposed portion 31. The position of the facing negative electrode 4 is deviated by one winding N times.
- the reason why the slit 40 is not provided at the positions of the exposed ends of the positive electrode current collector exposed portions 30 and 31 but has a margin of the overhang amount 41 is due to an arrangement error of the slit 40 and the slit 40 and the positive electrode active material. This is to avoid facing the layers 21 and 22. Since the negative electrode current collector 24 is exposed in the slit 40, lithium is deposited from the positive electrode active material layers 21 and 22 toward the negative electrode current collector 24 when facing the slit 40 and the positive electrode active material layers 21 and 22. Can occur. In order to prevent this lithium precipitation, an overhang amount 41 is provided.
- the overhang amount 41 is provided to prevent the irreversible capacity from being increased while preventing the precipitation of lithium.
- the overhang amount 41 only needs to be larger than the arrangement error of the slit 40.
- the overhang amount 41 can be several mm.
- the separation dimension by which the negative electrode active material layers 25 and 26 are separated by the slit 40 may be large enough to block lithium ion diffusion. For example, it can be 1/10 or less of the length dimension in which the positive electrode current collector exposed portions 30 and 31 are exposed. For example, if the length of the exposed positive electrode current collector exposed portions 30 and 31 is about 50 mm as one turn of the battery element 2, it can be about 1/10 of about 5 mm.
- the slit 40 is provided with the negative electrode active material layers 25 and 26 over the entire width direction of the negative electrode 4.
- the function of the slit 40 is to suppress irreversible capacity. It may not be provided over the entire direction.
- a cut for separating the negative electrode active material layers 25 and 26 with respect to the longitudinal direction may be provided in a part in the width direction of the negative electrode 4.
- an appropriate long hole or a plurality of holes may be provided in the negative electrode active material layers 25 and 26.
- the slit 40 may be a bottomed groove-like slit that is partially left in the depth direction of the negative electrode active material layers 25 and 26.
- the slit 40 may be omitted in the case of a specification in which the increase in the irreversible capacity does not have to be taken into account because the number of turns of the battery element 2 of the nonaqueous electrolyte secondary battery 1 is sufficiently large.
- the negative electrode 4 does not have the exposed portion of the negative electrode current collector 24, and the negative electrode active material layers 25 and 26 are provided across the front and back surfaces of the negative electrode current collector 24.
- the wound type nonaqueous electrolyte secondary battery 1 is crushed by pressure from the outside, or the separator 5 between the positive electrode 3 and the negative electrode 4 is broken or blown, so that the positive electrode 3 and the negative electrode 4 are in the battery can 7.
- the negative electrode active material layers 25 and 26 have remarkably lower resistance values than the positive electrode active material layers 21 and 22.
- the positive electrode current collector exposed portions 30 and 31 provided in the intermediate layer portion of the positive electrode 3 can be provided in one or more places. That is, the intermediate layer portion where the positive electrode current collector exposed portions 30 and 31 are located is from a portion at a distance of one turn of the winding from an end of the outermost circumference of the winding, from an end of the innermost circumference of the winding. It is provided up to the part at a distance of one turn of winding.
- the number of locations where the positive electrode current collector exposed portions 30 and 31 are provided can be determined in consideration of safety and battery capacity.
- the positive electrode 3 has positive electrode current collector exposed portions 30 and 31 without providing the positive electrode active material layers 21 and 22 on both front and back sides of the positive electrode current collector 20.
- the negative electrode 50 is not provided with the negative electrode active material layer 25 in a portion facing the positive electrode current collector exposed portion 31, and becomes a negative electrode current collector exposed portion 51.
- the negative electrode active material layer 26 is not provided in a portion facing the positive electrode current collector exposed portion 30, and becomes a negative electrode current collector exposed portion 52.
- the negative electrode current collector exposed portion 52 is disposed so as to face the positive electrode current collector exposed portion 30 and faces the positive electrode current collector exposed portion 31 over one turn of the battery element 2.
- the negative electrode current collector exposed portion 51 is disposed.
- the positive electrode current collector 20 and the negative electrode current collector 24 face each other over one turn of the battery element 2. Therefore, even when the positive electrode active material layers 21 and 22 are in contact with the negative electrode active material layers 25 and 26 inside the battery can 7, the positive electrode current collector 20 and the negative electrode current collector 24 having a low resistance value per area are sufficient. A large current can flow, and the positive electrode active material layers 21 and 22 can suppress abnormal heat generation between the negative electrode active material layers 25 and 26.
- the part 52 is at a position shifted by one turn of the positive electrode 3.
- the battery element 2 is formed by preparing a positive electrode 3, a negative electrode 50, and a separator 5 in advance, laminating them, and winding them around a pipe-shaped core 14.
- the positive electrode current collector 20 and the negative electrode current collector 24 are opposed to each other for one turn as in the prior art, the positive electrode current collector 20 and the negative electrode current collector 24 are obtained as shown in FIG. There are places where the number of turns cannot be provided. For this reason, a large difference in stacking thickness occurs between the number of turns and the number of turns adjacent thereto. If the layers are wound with different thicknesses, for example, the negative electrode active material layers 25 and 26 may slide off from the negative electrode current collector 24. Thus, it is the first problem with the prior art that it is difficult to form the negative electrode 50.
- Another problem in the prior art is that when the negative electrode current collector exposed portion 51 and the negative electrode current collector exposed portion 52 formed at different positions are wound, the negative electrode current collector exposed portion 51 is connected to the positive electrode current collector. It is necessary to face the body exposed portion 31 and face the negative electrode current collector exposed portion 52 to the positive electrode current collector exposed portion 30. This positioning is quite difficult and misalignment tends to occur. This is the second problem.
- FIG. 7 and FIG. 8 are diagrams showing a case where a positional deviation occurs in the facing between the positive electrode current collector exposed portions 30 and 31 and the negative electrode current collector exposed portions 51 and 52.
- FIG. 7 and FIG. 8 are diagrams showing a case where a positional deviation occurs in the facing between the positive electrode current collector exposed portions 30 and 31 and the negative electrode current collector exposed portions 51 and 52.
- FIG. 7 shows the time when the positive electrode active material layer 22 faces the negative electrode current collector 24 due to the displacement. At this time, lithium deposition 60 may occur from the negative electrode current collector 24 toward the positive electrode active material layer 22. When lithium deposition 60 occurs, the positive electrode 3 and the negative electrode 50 are short-circuited.
- FIG. 8 shows a case where the negative electrode active material layer 25 faces the positive electrode current collector 20 due to a positional shift. At this time, lithium ions that flow into the negative electrode 50 from the positive electrode 3 move inside the negative electrode active material layer 25. In this way, ion migration 61 that contributes to electromotive force occurs toward the negative electrode active material layer 25 that does not face the positive electrode active material layer 22. Ions that have moved to the negative electrode active material layer 25 not facing the positive electrode active material layer 22 have an irreversible capacity, and reduce the charge / discharge efficiency of the nonaqueous electrolyte secondary battery 1.
- lithium deposition 60 may occur. Or, the irreversible capacity may increase.
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Abstract
Description
Claims (5)
- 正極集電体の両面に正極活物質層が形成された正極と負極集電体の両面に前記正極活物質層よりも低抵抗値を有する負極活物質層が形成された負極とがセパレータを介して積層し巻回された電池素子を電池缶に収容した非水電解質二次電池であって、
前記正極は、前記巻回の中間層部に前記電池素子の前記巻回の1周以上の長さ寸法に渡って前記正極集電体が露出する正極集電体露出部を有し、
前記中間層部で露出されている正極集電体と対向する部分の負極は、負極集電体上に積層された負極活物質層が配置される、非水電解質二次電池。 - 正極集電体の両面に正極活物質層が形成された正極と負極集電体の両面に前記正極活物質層よりも低抵抗値を有する負極活物質層が形成された負極とがセパレータを介して積層し巻回された電池素子を電池缶に収容した非水電解質二次電池であって、
前記正極は、前記巻回の中間層部に前記電池素子の前記巻回の1周以上の長さ寸法に渡って前記正極集電体が露出する正極集電体露出部を有し、
前記負極は、前記正極集電体露出部の露出両端部よりも露出側に、前記負極活物質層を通って起電力に寄与するイオンが拡散するのを抑制する活物質層分離部を有する、非水電解質二次電池。 - 請求項2に記載の非水電解質二次電池において、
前記負極は、前記活物質分離部として、予め定めた分離寸法のスリットを有する、非水電解質二次電池。 - 請求項3に記載の非水電解質二次電池において、
前記スリットの分離寸法は、前記正極集電体露出部が露出する前記長さ寸法の1/10以下である非水電解質二次電池。 - 請求項1または2に記載の非水電解質二次電池において、
前記巻回の中間層部は、前記巻回の最外周の端部から前記巻回の1周分の距離にある部分から、前記巻回の最内周の端部から前記巻回の1周分の距離にある部分までの間に設けられる、非水電解質二次電池。
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WO2013014833A1 (ja) * | 2011-07-25 | 2013-01-31 | パナソニック株式会社 | リチウムイオン二次電池 |
JP2013026072A (ja) * | 2011-07-22 | 2013-02-04 | Sony Corp | 非水電解質電池ならびに電池パック、電子機器、電動車両、蓄電装置および電力システム |
WO2013038701A1 (ja) * | 2011-09-14 | 2013-03-21 | パナソニック株式会社 | 非水電解質二次電池 |
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US5989743A (en) * | 1994-09-27 | 1999-11-23 | Asahi Kasei Kogyo Kabushiki Kaisha | Non-aqueous battery |
JP3200340B2 (ja) | 1994-09-27 | 2001-08-20 | 旭化成株式会社 | 非水系電池 |
US6461759B1 (en) * | 2000-06-09 | 2002-10-08 | Wilson Greatbatch, Ltd. | Cathode assembly with bare current collector regions to facilitate winding |
JP4580620B2 (ja) * | 2002-03-13 | 2010-11-17 | パナソニック株式会社 | 電池に用いる渦巻状電極群の製造方法 |
KR100563055B1 (ko) * | 2003-08-19 | 2006-03-24 | 삼성에스디아이 주식회사 | 권취형 전극 조립체 및 이를 구비한 이차 전지 |
JP2005100899A (ja) * | 2003-09-26 | 2005-04-14 | Sony Corp | 非水電解質二次電池 |
JP4649993B2 (ja) * | 2005-01-12 | 2011-03-16 | パナソニック株式会社 | リチウム二次電池およびその製造方法 |
JP2007109612A (ja) | 2005-10-17 | 2007-04-26 | Sony Corp | 非水電解質二次電池 |
JP4412304B2 (ja) * | 2006-05-17 | 2010-02-10 | ソニー株式会社 | 二次電池 |
JP2008077996A (ja) * | 2006-09-22 | 2008-04-03 | Sony Corp | 巻回電池 |
JP2008262810A (ja) * | 2007-04-12 | 2008-10-30 | Sony Corp | 電池 |
JP5110516B2 (ja) * | 2007-11-06 | 2012-12-26 | Necエナジーデバイス株式会社 | 非水電解液二次電池 |
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JP2013026072A (ja) * | 2011-07-22 | 2013-02-04 | Sony Corp | 非水電解質電池ならびに電池パック、電子機器、電動車両、蓄電装置および電力システム |
WO2013014833A1 (ja) * | 2011-07-25 | 2013-01-31 | パナソニック株式会社 | リチウムイオン二次電池 |
WO2013038701A1 (ja) * | 2011-09-14 | 2013-03-21 | パナソニック株式会社 | 非水電解質二次電池 |
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US10141599B2 (en) | 2018-11-27 |
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