WO2017057762A1 - Electrode portion of lithium ion secondary battery, lithium ion secondary battery, and manufacturing method of lithium ion secondary battery - Google Patents

Electrode portion of lithium ion secondary battery, lithium ion secondary battery, and manufacturing method of lithium ion secondary battery Download PDF

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Publication number
WO2017057762A1
WO2017057762A1 PCT/JP2016/079180 JP2016079180W WO2017057762A1 WO 2017057762 A1 WO2017057762 A1 WO 2017057762A1 JP 2016079180 W JP2016079180 W JP 2016079180W WO 2017057762 A1 WO2017057762 A1 WO 2017057762A1
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Prior art keywords
secondary battery
lithium ion
ion secondary
positive electrode
negative electrode
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PCT/JP2016/079180
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French (fr)
Japanese (ja)
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小川　浩
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積水化学工業株式会社
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Priority to JP2017543664A priority Critical patent/JPWO2017057762A1/en
Publication of WO2017057762A1 publication Critical patent/WO2017057762A1/en

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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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to an electrode part of a lithium ion secondary battery, a lithium ion secondary battery, and a method of manufacturing a lithium ion secondary battery.
  • This application claims priority based on Japanese Patent Application No. 2015-195345 for which it applied to Japan on September 30, 2015, and uses the content here.
  • Lithium ion secondary batteries are characterized by higher energy density and electromotive force than lead-acid batteries and nickel metal hydride batteries. Therefore, they are widely used as power sources for various devices that require miniaturization and weight reduction. ing.
  • the lithium ion secondary battery includes a positive electrode part in which a positive electrode active material is applied to a positive electrode current collector, and a negative electrode part in which a negative electrode active material is applied to a negative positive electrode current collector. And have. And while laminating
  • a predetermined pressure is applied between both electrodes. This is because if the electrode and the electrolyte are not sufficiently adhered, the internal resistance of the battery increases and the power loss increases, and if the electrolyte and the electrode do not have a sufficient contact area, a predetermined battery capacity is obtained. This is because it cannot be obtained.
  • the pressurizing action at the time of manufacturing such a lithium ion secondary battery may cause a short circuit between both electrodes, which may reduce the yield of the product.
  • a projection so-called burr
  • burr a projection
  • the protrusion breaks the separator, causing a short circuit between both electrodes.
  • an electrical insulating material insulating tape made of polyimide or polypropylene is preliminarily attached to a place where an electrode short-circuit is likely to occur (for example, Patent Documents). 2).
  • the present invention has been made to solve the above-mentioned problems, and its object is to improve the adhesion of the insulating layer between the electrodes, thereby preventing a short circuit between the two electrodes and maintaining the battery performance. It is providing the electrode part of a lithium ion secondary battery, the lithium ion secondary battery using the electrode part, and its manufacturing method.
  • an electrode part of a lithium ion secondary battery according to the present invention is an electrode part of a lithium ion secondary battery having a positive electrode, a negative electrode, and an electrolyte layer between the positive electrode and the negative electrode, A current collector and an active material layer laminated on the surface of the current collector, the current collector end of the positive electrode and the negative electrode, and the other negative electrode and the positive electrode laminated on each of the positive electrode and the negative electrode.
  • the portion facing the end of the current collector is coated with an insulating coating film.
  • an insulation coating film shows the coating film comprised by apply
  • the electrode part is an electrode part of a lithium ion secondary battery having a positive electrode, a negative electrode, and an electrolyte layer between the positive electrode and the negative electrode.
  • the positive electrode and the negative electrode are formed from a current collector and an active material layer laminated on the surface thereof.
  • a current collector exposing portion in which no electrolyte layer is formed at an end portion of the surface of the positive electrode and the negative electrode facing each of the positive electrode and the negative electrode, and the current collector exposing portion is It is preferable that it is an electrode part of the lithium ion secondary battery coat
  • the electrode part of the lithium ion secondary battery according to the present invention is an electrode part of a lithium ion secondary battery having a positive electrode, a negative electrode, and an electrolyte layer therebetween, and is formed at end portions of the positive electrode and the negative electrode.
  • the protrusion, the other negative electrode laminated on each of the positive electrode and the negative electrode on which the protrusion is formed, and the portion facing the protrusion of the positive electrode are coated with an insulating coating film. It is a feature.
  • this electrode part is an electrode part of a lithium ion secondary battery having a positive electrode, a negative electrode, and an electrolyte layer therebetween, and a protrusion is formed at an end of one of the positive electrode and the negative electrode, A current collector exposed portion in which an electrolyte layer is not formed at the end of the other electrode facing the protruding portion is provided, and at least one of the protruding portion and the current collector exposed portion is formed of an insulating coating film.
  • the electrode part of the lithium ion secondary battery that is coated is preferable.
  • a lithium ion secondary battery according to the present invention includes the above-described electrode portion.
  • a method of manufacturing a lithium ion secondary battery according to the present invention is a method of manufacturing a lithium ion secondary battery including the above-described electrode unit, and includes a collection of the positive electrode and the negative electrode. And a step of coating an end portion of the electric conductor, another negative electrode laminated on each of the positive electrode and the negative electrode, and a portion facing the current collector end portion of the positive electrode with an insulating coating film. It is said. Further, in this method, a current collector exposing portion in which an electrolyte layer is not formed is provided at an end portion of the surface of the positive electrode and the negative electrode where the positive electrode and the negative electrode face each other. It is preferable that it is a manufacturing method of a lithium ion secondary battery which has the process of coating an exposed part with an insulating coating film.
  • the protrusions are formed even on the positive electrode and the negative electrode. Since the insulating coating film is interposed between the positive electrode and the negative electrode in the vicinity of the portion, a short circuit between the positive electrode and the negative electrode can be effectively prevented. Moreover, the performance of a lithium ion secondary battery can be maintained by improving the adhesiveness of the insulating coating film between electrodes. In addition, since the insulating coating can be formed by applying a paint having electrical insulation properties, the thickness can be reduced and simpler than when a conventional insulating tape is applied. Productivity can be increased.
  • the electrode part of the lithium ion secondary battery according to the present invention is characterized in that the insulating coating (that is, the paint having electrical insulation) includes insulating particles having electrical insulation.
  • the particles are preferably organic particles made of inorganic particles such as alumina and silica, or organic materials such as phenol resin, epoxy resin, and silicon resin.
  • the insulating coating film is configured to include insulating particles such as alumina, an insulating coating film having excellent mechanical strength can be formed.
  • the insulating coating film is porous.
  • the insulating coating film is porous, it is possible to suppress a decrease in the contact area between the positive electrode active material layer of the positive electrode and the negative electrode active material layer of the negative electrode.
  • the electrode part of the lithium ion secondary battery according to the present invention, the lithium ion secondary battery using the electrode part, and the method for producing the lithium ion secondary battery are provided with an insulating coating film on the positive electrode or / and the negative electrode. Even if the positive electrode and negative electrode have protrusions and the separator breaks, the short circuit between the positive electrode and the negative electrode is effectively achieved by improving the adhesion of the insulating layer (that is, the insulating coating film) between the electrodes. Battery performance can be maintained. Moreover, since the insulating coating is formed by applying a paint having electrical insulation properties, the thickness can be reduced more easily than when a conventional insulating tape is applied, and the electrode portion and the lithium ion secondary Battery productivity can be increased.
  • FIG. 1 is a cross-sectional view of a lithium ion secondary battery LB according to an embodiment of the present invention, in which a negative electrode 1 is provided on the upper side and a positive electrode 10 is provided on the lower side.
  • a separator 20 and an electrolyte layer 22 are interposed between the negative electrode 1 and the positive electrode 10.
  • the electrode part P has the positive electrode 10, the negative electrode 1, and the electrolyte layer 22 between them, and comprises a lithium ion secondary battery.
  • the negative electrode 1 has a negative electrode current collector (current collector) 2 made of, for example, copper foil, and negative electrode active material layers (active material layers) 3 respectively formed on the upper and lower surfaces of the negative electrode current collector 2. Configured.
  • a known negative electrode active material such as aluminum, graphite, metal silicon, or metal lithium foil is used.
  • the negative electrode current collector 2 is provided with a terminal 4 protruding from a part of one side (left side in FIG. 1).
  • the current collector end 1e of the negative electrode 1 is a portion that is cut by a cutter when the negative electrode 1 is manufactured in a large area by, for example, a roll-to-roll method (RtoR method) or the like and cut into a desired size. Is shown.
  • a protrusion in which the material of the negative electrode 1 protrudes from the surface of the negative electrode active material layer 3 tends to occur at the current collector end 1e of the negative electrode 1.
  • the current collector end portion 1 e is an end portion of a laminate of the negative electrode current collector 2 and the negative electrode active material layer 3 generated on each of the upper and lower surfaces of the negative electrode current collector 2.
  • the positive electrode 10 includes a positive electrode current collector (current collector) 11 made of, for example, an aluminum foil, and positive electrode active material layers (active material layers) 12 respectively formed on the upper and lower surfaces of the positive electrode current collector 11. It is configured.
  • the positive electrode active material layer 12 is mainly composed of a positive electrode active material and a binder, and a conductive additive is added as necessary.
  • the positive electrode active material various active material materials that reversibly advance and absorb lithium ions can be used.
  • lithium composite metal oxides such as lithium cobaltate, lithium manganate, lithium nickelate, and lithium titanate can be used.
  • metal lithium is used for the negative electrode active material layer 3 of the negative electrode 1
  • a positive electrode active material such as FeOOH or NiOOH that does not contain lithium is used.
  • the positive electrode current collector 11 is provided with a terminal 13 that protrudes from a part of one side (right side in the illustrated example).
  • the surface of the positive electrode active material layer 12 is provided with an insulating coating film 14 formed by applying an electrically insulating paint.
  • This paint is composed of inorganic particles such as alumina (aluminum oxide (Al 2 O 3 )) and silica (silicon dioxide (SiO 2 )), and the mechanical strength of the coating film is increased.
  • the insulating coating 14 is provided in at least a portion 10 e of the positive electrode 10 that faces the current collector end 1 e of the negative electrode 1.
  • the positive electrode current collector 11 is provided in a predetermined range facing the current collector end portion 1 e of the negative electrode 1 on the upper and lower surfaces of the positive electrode current collector 11, and is connected to the positive electrode active material layer 12.
  • the thickness of the insulating coating film 14 may be 1 ⁇ m or more and 30 ⁇ m or less. preferable.
  • the insulating coating film 14 satisfies the above conditions, even when the negative electrode 1 and the positive electrode 10 are laminated via the separator 20, even if the protrusion formed on the current collector end 1 e passes through the separator 20.
  • the tip of the protruding portion is disposed on the surface of the insulating coating film 14 or in the insulating coating film 14, so that a short circuit between the negative electrode 1 and the positive electrode 10 can be more reliably prevented.
  • the thickness and mechanical strength of the insulating coating film 14 should be appropriately set in consideration of the materials of the negative electrode current collector 2, the negative electrode active material layer 3, the positive electrode current collector 11 and the positive electrode active material layer 12. Is preferred. In FIG.
  • the insulating coating 14 is also applied to the peripheral portion of the positive electrode active material layer 12 provided on the positive electrode 10.
  • the insulating coating film 14 is porous, that is, when the coating film formed by applying an electrically insulating paint is porous, the insulating coating film 14 is applied to the entire surface of the positive electrode 10. It can also be formed.
  • the separator 20 can be used as long as it functions as an ion permeable membrane.
  • a polyethylene porous film, a polypropylene porous film, or a nonwoven fabric can be used.
  • the electrolyte layer 22 may be a gel electrolyte that is made of a known electrolytic solution or the like and gels in the exterior body 24.
  • the planar shapes of the negative electrode 1, the positive electrode 10, and the separator 20 are similar to each other having a rectangular shape, and are formed in substantially the same area.
  • the area of the separator 20 is the largest, the next is the negative electrode 1, and the positive electrode 10 is the smallest.
  • the length of the long side of the separator 20 is 56.8 mm, the length of the short side is 42.6 mm, those of the negative electrode 1 are 54.8 mm, 41.6 mm, and those of the positive electrode 10 are 53. 8 mm and 40.6 mm.
  • An electrolyte layer 22 is provided between the negative electrode 1 and the positive electrode 10 with the separator 20 interposed therebetween.
  • a well-known electrolyte or electrolytic solution can be used for the electrolyte layer 22 .
  • an electrolytic solution of a lithium salt such as LiPF 6 , LiBF 4 , or LiClO 4 and a mixed solvent of ethylene carbonate (EC) and diethyl carbonate (DEC) can be used.
  • EC ethylene carbonate
  • DEC diethyl carbonate
  • the negative electrode 1, the positive electrode 10, the separator 20, and the electrolyte layer 22 are formed in an exterior body 24 in which these laminates (that is, the electrode portion P) are made of a laminated aluminum film or the like, as in a known lithium ion secondary battery.
  • the lithium ion secondary battery LB is manufactured by sealing.
  • the electrolyte layer 22 is filled not only between the negative electrode 1 and the positive electrode 10 but also around the electrode part P.
  • a negative electrode material containing a negative electrode active material is applied to the upper and lower surfaces of the negative electrode current collector 2 with a thickness of about 5 ⁇ m to 100 ⁇ m, and then the solvent contained in the negative electrode material Is removed by drying to form the negative electrode active material layer 3, thereby forming the negative electrode 1.
  • a positive electrode material containing a positive electrode active material is applied to the upper and lower surfaces of the positive electrode current collector 11 with a thickness of about 5 ⁇ m to 100 ⁇ m, the solvent contained in the positive electrode material is removed by drying, and the positive electrode active material layer 12 is removed.
  • the positive electrode 10 is formed.
  • the negative electrode 1 and the positive electrode 10 can be manufactured by the RtoR method.
  • the negative electrode 1 is cut from each large-area electrode part to a desired size as described above with a cutter or the like.
  • the positive electrode 10 At that time, for example, a protrusion may be formed on the current collector end 1 e of the negative electrode 1.
  • an electrically insulating coating liquid is applied to at least the current collector end 1e of the negative electrode 1 as shown in FIG. 1 by using a known coating method such as a die method or a gravure method.
  • coating to the opposing part and forming the insulating coating film 14 is performed.
  • the negative electrode 1 and the positive electrode 10 are laminated
  • the terminals 4 and 13 are protruded from the exterior body 24, respectively.
  • the temporary sealing of the laminate cell is partially unwound, and after the electrolyte layer 22 is formed, it is completely sealed.
  • the lithium ion secondary battery LB shown in FIG. 1 is obtained.
  • the lithium ion secondary battery LB having the above-described configuration, and the manufacturing method thereof, since the insulating coating 14 is provided on the positive electrode 10, provisional portions such as burrs are temporarily formed on the current collector end 1 e of the negative electrode 1. Even if it is formed and the separator 20 is broken, the short circuit between the negative electrode 1 and the positive electrode 10 can be effectively prevented. Moreover, the performance of the lithium ion secondary battery LB can be maintained by improving the adhesion of the insulating coating film 14 between the electrodes. In addition, since the insulating coating film 14 can be formed simply by applying a coating film having electrical insulating properties, it is easier to apply than the conventional insulating tape, and the electrode portion P and the lithium ion secondary battery LB.
  • the thickness of the insulating coating film 14 can be about 10 micrometers, it is thinner than 35 micrometers of the conventional insulation tape thickness, and can suppress the fall of battery performance. Moreover, when the insulating coating film 14 is porous, the fall of the contact area of the positive electrode active material layer 12 of the positive electrode 10 can be suppressed.
  • the insulating coating film 14 (that is, the paint having electrical insulation) is configured to include inorganic particles such as alumina and silica.
  • the insulating coating film 14 having excellent strength can be formed.
  • the insulating coating film is porous, it is possible to suppress a decrease in the contact area between the positive electrode active material layer 12 and the negative electrode active material layer 3. .
  • the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.
  • the separator 20 is omitted and only the insulating coating film 14 whose thickness is appropriately adjusted is the positive electrode. It may be provided on the active material layer 12.
  • the positive electrode active material layer 12 is formed on the upper and lower surfaces of the positive electrode current collector 11 with the insulating coating 14 facing the current collector end 1 e of the negative electrode 1 in the positive electrode 10.
  • the present invention is not limited to such a form.
  • the insulating coating film 14 may be provided on the surface of the positive electrode active material layer 12 on the side opposite to the positive electrode current collector 11.
  • the insulating coating film 14 covers the end portion from the surface of the positive electrode active material layer 12 from the end portion, and faces the current collector end portion 1 e of the negative electrode 1. It may be provided over the upper and lower surfaces. As shown in FIG.
  • the insulating coating film 14 may be provided so as to directly cover the protrusion 6. Furthermore, the negative electrode 1 and the positive electrode 10 of the above-described embodiment may be reversed. That is, the current collector end portion of the positive electrode 10 and the portion of the negative electrode facing the current collector end portion of the positive electrode may be covered with the insulating coating film 14.

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)
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Abstract

An electrode portion of a lithium ion secondary battery comprising a positive electrode, a negative electrode, and an electrolytic layer between the positive electrode and the negative electrode, wherein the positive electrode and the negative electrode comprise a current collector and an active material layer laminated on the surface of the current collector, wherein current collector end portions of the positive electrode and the negative electrode; and sections of another negative electrode and positive electrode laminated respectively on the positive electrode and the negative electrode, which are facing the current collector end portions, are coated by an insulation coating.

Description

リチウムイオン二次電池の電極部、リチウムイオン二次電池及びリチウムイオン二次電池の製造方法Electrode part of lithium ion secondary battery, lithium ion secondary battery, and method for producing lithium ion secondary battery
　本発明は、リチウムイオン二次電池の電極部、リチウムイオン二次電池及びリチウムイオン二次電池の製造方法に関する。
　本願は、２０１５年９月３０日に日本に出願された特願２０１５－１９５３４５号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to an electrode part of a lithium ion secondary battery, a lithium ion secondary battery, and a method of manufacturing a lithium ion secondary battery.
This application claims priority based on Japanese Patent Application No. 2015-195345 for which it applied to Japan on September 30, 2015, and uses the content here.
　リチウムイオン二次電池は、鉛蓄電池やニッケル水素電池に比べてエネルギー密度及び起電力が高いという特長を有しているため、小型化・軽量化が要求される各種の機器用電源として広く利用されている。このリチウムイオン二次電池は、特許文献１に示されるように、正極活物質が正極集電体に塗工された正極部と、負極活物質が負正極集電体に塗工された負極部とを有している。そして、これら両極部間にセパレータ及び電解質を介在させて積層させるとともに、その積層体をケース内に密封させて構成されている。 Lithium ion secondary batteries are characterized by higher energy density and electromotive force than lead-acid batteries and nickel metal hydride batteries. Therefore, they are widely used as power sources for various devices that require miniaturization and weight reduction. ing. As shown in Patent Document 1, the lithium ion secondary battery includes a positive electrode part in which a positive electrode active material is applied to a positive electrode current collector, and a negative electrode part in which a negative electrode active material is applied to a negative positive electrode current collector. And have. And while laminating | stacking a separator and electrolyte between these both pole parts, it is comprised by sealing the laminated body in a case.
　このリチウムイオン二次電池の製造においては、両電極間に所定の圧力が加えられる。なぜならば、電極と電解質とを十分に密着させないと電池の内部抵抗が大きくなって損失電力が増してしまうとともに、電解質と電極とが十分な接触面積を有していないと、所定の電池容量が得られなくなるからである。 In manufacturing the lithium ion secondary battery, a predetermined pressure is applied between both electrodes. This is because if the electrode and the electrolyte are not sufficiently adhered, the internal resistance of the battery increases and the power loss increases, and if the electrolyte and the electrode do not have a sufficient contact area, a predetermined battery capacity is obtained. This is because it cannot be obtained.
　ところで、このようなリチウムイオン二次電池の製造時における加圧作用は、両電極間に短絡を生じさせ、製品の歩留まりを低下させてしまうおそれがあった。特に、負極部の製造時に行われるカッターによる切断の際に、その負極部の切断面に突起（所謂、バリ）が生じると、その突起がセパレータを破ってしまい、両電極間に短絡を生じさせるからである。このような不都合を防止するために、電極の短絡の生じやすい箇所に、予め、ポリイミドあるいはポプロピレン製等の電気絶縁材（絶縁テープ）を貼着することが行われている（例えば、特許文献２参照）。 By the way, the pressurizing action at the time of manufacturing such a lithium ion secondary battery may cause a short circuit between both electrodes, which may reduce the yield of the product. In particular, when a projection (so-called burr) is generated on the cut surface of the negative electrode portion during cutting with a cutter performed at the time of manufacturing the negative electrode portion, the protrusion breaks the separator, causing a short circuit between both electrodes. Because. In order to prevent such an inconvenience, an electrical insulating material (insulating tape) made of polyimide or polypropylene is preliminarily attached to a place where an electrode short-circuit is likely to occur (for example, Patent Documents). 2).
特開２０１３－３０３７６号公報JP 2013-30376 A 特開２００１－２６６９４６号公報JP 2001-266946 A
　しかしながら、従来の絶縁テープを用いて両電極間の絶縁を図るリチウムイオン二次電池の場合、絶縁テープは、常時、電解質と接しているために絶縁テープの粘着剤の粘着力が弱まり、絶縁テープが剥がれてしまうおそれがあるとともに、絶縁テープの厚さが厚くなると、電池性能に悪影響を与えるおそれがあった。また、絶縁テープを用いて絶縁を図るリチウムイオン二次電池の場合は、絶縁テープを張り付けなければならないという面倒な工程を必要とし、生産性に劣るという欠点があった。 However, in the case of a lithium ion secondary battery that uses a conventional insulating tape to insulate between both electrodes, the insulating tape is always in contact with the electrolyte, so the adhesive strength of the adhesive of the insulating tape is weakened, and the insulating tape May peel off, and when the thickness of the insulating tape is increased, battery performance may be adversely affected. In addition, in the case of a lithium ion secondary battery that uses an insulating tape to insulate, there is a drawback in that the laborious process of attaching the insulating tape is required, resulting in poor productivity.
　本発明は、上記課題を解決するためになされたものであって、その目的は、電極間の絶縁層の密着性を向上させることで、両電極間の短絡を防止でき、電池性能を維持できるリチウムイオン二次電池の電極部、その電極部を用いたリチウムイオン二次電池及びその製造方法を提供することにある。 The present invention has been made to solve the above-mentioned problems, and its object is to improve the adhesion of the insulating layer between the electrodes, thereby preventing a short circuit between the two electrodes and maintaining the battery performance. It is providing the electrode part of a lithium ion secondary battery, the lithium ion secondary battery using the electrode part, and its manufacturing method.
　上記目的を達成するために、本発明に係るリチウムイオン二次電池の電極部は、正極と負極とその間に電解質層を有するリチウムイオン二次電池の電極部であって、前記正極と前記負極は、集電体とその表面に積層された活物質層からなり、前記正極と前記負極の集電体端部と、前記正極と前記負極のそれぞれに積層される別の前記負極と前記正極の前記集電体端部に対向する部分と、が絶縁塗膜によって被膜されていることを特徴としている。なお、絶縁塗膜とは、電気絶縁性を有する塗料を塗布して構成される塗膜を示す。また、この電極部は、正極と負極とその間に電解質層を有するリチウムイオン二次電池の電極部であって、前記正極と前記負極は、集電体とその表面に積層された活物質層からなり、前記正極及び前記負極の何れか一方の、前記正極と前記負極とが対向する面の端部において電解質層が形成されていない集電体露呈部が設けられ、前記集電体露呈部が絶縁塗膜によって被膜されているリチウムイオン二次電池の電極部であることが好ましい。
　また、本発明に係るリチウムイオン二次電池の電極部は、正極と負極とその間に電解質層を有するリチウムイオン二次電池の電極部であって、前記正極と前記負極の端部に形成される突起部と、前記突起部が形成された前記正極と前記負極のそれぞれに積層される別の前記負極と前記正極の前記突起部に対向する部分と、が絶縁塗膜によって被膜されていることを特徴としている。また、この電極部は、正極と負極とその間に電解質層を有するリチウムイオン二次電池の電極部であって、前記正極及び前記負極の何れか一方の電極の端部に突起部が形成され、
　他の一方の電極の、前記突起部に対向する端部において電解質層が形成されていない集電体露呈部が設けられ、前記突起部と前記集電体露呈部の少なくとも一方が絶縁塗膜によって被膜されているリチウムイオン二次電池の電極部であることが好ましい。
　また、上記目的を達成するために、本発明に係るリチウムイオン二次電池は、上述の電極部を備えたことを特徴としている。
　そして、上記目的を達成するために、本発明に係るリチウムイオン二次電池の製造方法は、上述の電極部を備えたリチウムイオン二次電池の製造方法であって、前記正極と前記負極の集電体端部と、前記正極と前記負極のそれぞれに積層される別の前記負極と前記正極の前記集電体端部に対向する部分と、を絶縁塗膜によって被膜する工程を有することを特徴としている。また、この方法は、前記正極及び前記負極の何れか一方の、前記正極と前記負極とが対向する面の端部において電解質層が形成されていない集電体露呈部を設け、前記集電体露呈部を絶縁塗膜によって被膜する工程を有するリチウムイオン二次電池の製造方法であることが好ましい。 In order to achieve the above object, an electrode part of a lithium ion secondary battery according to the present invention is an electrode part of a lithium ion secondary battery having a positive electrode, a negative electrode, and an electrolyte layer between the positive electrode and the negative electrode, A current collector and an active material layer laminated on the surface of the current collector, the current collector end of the positive electrode and the negative electrode, and the other negative electrode and the positive electrode laminated on each of the positive electrode and the negative electrode. The portion facing the end of the current collector is coated with an insulating coating film. In addition, an insulation coating film shows the coating film comprised by apply | coating the coating material which has electrical insulation. The electrode part is an electrode part of a lithium ion secondary battery having a positive electrode, a negative electrode, and an electrolyte layer between the positive electrode and the negative electrode. The positive electrode and the negative electrode are formed from a current collector and an active material layer laminated on the surface thereof. A current collector exposing portion in which no electrolyte layer is formed at an end portion of the surface of the positive electrode and the negative electrode facing each of the positive electrode and the negative electrode, and the current collector exposing portion is It is preferable that it is an electrode part of the lithium ion secondary battery coat | covered with the insulating coating film.
Moreover, the electrode part of the lithium ion secondary battery according to the present invention is an electrode part of a lithium ion secondary battery having a positive electrode, a negative electrode, and an electrolyte layer therebetween, and is formed at end portions of the positive electrode and the negative electrode. The protrusion, the other negative electrode laminated on each of the positive electrode and the negative electrode on which the protrusion is formed, and the portion facing the protrusion of the positive electrode are coated with an insulating coating film. It is a feature. Further, this electrode part is an electrode part of a lithium ion secondary battery having a positive electrode, a negative electrode, and an electrolyte layer therebetween, and a protrusion is formed at an end of one of the positive electrode and the negative electrode,
A current collector exposed portion in which an electrolyte layer is not formed at the end of the other electrode facing the protruding portion is provided, and at least one of the protruding portion and the current collector exposed portion is formed of an insulating coating film. The electrode part of the lithium ion secondary battery that is coated is preferable.
In order to achieve the above object, a lithium ion secondary battery according to the present invention includes the above-described electrode portion.
In order to achieve the above object, a method of manufacturing a lithium ion secondary battery according to the present invention is a method of manufacturing a lithium ion secondary battery including the above-described electrode unit, and includes a collection of the positive electrode and the negative electrode. And a step of coating an end portion of the electric conductor, another negative electrode laminated on each of the positive electrode and the negative electrode, and a portion facing the current collector end portion of the positive electrode with an insulating coating film. It is said. Further, in this method, a current collector exposing portion in which an electrolyte layer is not formed is provided at an end portion of the surface of the positive electrode and the negative electrode where the positive electrode and the negative electrode face each other. It is preferable that it is a manufacturing method of a lithium ion secondary battery which has the process of coating an exposed part with an insulating coating film.
　本発明におけるリチウムイオン二次電池の電極部、リチウムイオン二次電池及びリチウムイオン二次電池の製造方法では、正極、負極に突起部（所謂、バリ）が形成される場合であっても、突起部近傍の正極と負極との間に絶縁塗膜が介在されているので、正極と負極との短絡を効果的に防止することができる。また、電極間の絶縁塗膜の密着性を向上させることで、リチウムイオン二次電池の性能を維持することができる。しかも、絶縁塗膜は電気絶縁性を有する塗料を塗布することによって形成することができるので、従来の絶縁テープを張着するよりも厚みを抑え、且つ簡単に行うことができるから、電極部の生産性を高めることができる。 In the lithium ion secondary battery electrode part, the lithium ion secondary battery, and the lithium ion secondary battery manufacturing method of the present invention, the protrusions (so-called burrs) are formed even on the positive electrode and the negative electrode. Since the insulating coating film is interposed between the positive electrode and the negative electrode in the vicinity of the portion, a short circuit between the positive electrode and the negative electrode can be effectively prevented. Moreover, the performance of a lithium ion secondary battery can be maintained by improving the adhesiveness of the insulating coating film between electrodes. In addition, since the insulating coating can be formed by applying a paint having electrical insulation properties, the thickness can be reduced and simpler than when a conventional insulating tape is applied. Productivity can be increased.
　本発明に係るリチウムイオン二次電池の電極部において、絶縁塗膜（即ち、電気絶縁性を有する塗料）は、電気的絶縁性を有する絶縁粒子を含んで構成されていることを特徴としている。前記粒子は、アルミナやシリカ等の無機粒子や、フェノール樹脂、エポキシ樹脂、シリコン樹脂等の有機材料からなる有機粒子であることが好ましい。 The electrode part of the lithium ion secondary battery according to the present invention is characterized in that the insulating coating (that is, the paint having electrical insulation) includes insulating particles having electrical insulation. The particles are preferably organic particles made of inorganic particles such as alumina and silica, or organic materials such as phenol resin, epoxy resin, and silicon resin.
　本発明におけるリチウムイオン二次電池の電極部では、絶縁塗膜がアルミナ等の絶縁粒子を含んで構成されるので、機械的強度に優れた絶縁塗膜を形成することができる。 In the electrode part of the lithium ion secondary battery according to the present invention, since the insulating coating film is configured to include insulating particles such as alumina, an insulating coating film having excellent mechanical strength can be formed.
　本発明に係るリチウムイオン二次電池の電極部において、絶縁塗膜は多孔質であることを特徴としている。 In the electrode part of the lithium ion secondary battery according to the present invention, the insulating coating film is porous.
　本発明におけるリチウムイオン二次電池の電極部では、絶縁塗膜が多孔質であるから、正極の正極活物質層及び負極の負極活物質層の接触面積の低下を抑制することができる。 In the electrode part of the lithium ion secondary battery in the present invention, since the insulating coating film is porous, it is possible to suppress a decrease in the contact area between the positive electrode active material layer of the positive electrode and the negative electrode active material layer of the negative electrode.
　本発明に係るリチウムイオン二次電池の電極部、その電極部を用いるリチウムイオン二次電池及びそのリチウムイオン二次電池の製造方法は、正極又は／及び負極に絶縁塗膜が設けられているので、正極や負極に突起部が生じていてセパレータが破損しても、電極間の絶縁層（つまり、絶縁塗膜）の密着性を向上させることで、正極と負極との間の短絡を効果的に防止でき、電池性能を維持できる。しかも、絶縁塗膜は電気絶縁性を有する塗料を塗布することで形成されるので、従来の絶縁テープを張着するよりも厚みを抑え、簡単に行うことができ、電極部及びリチウムイオン二次電池の生産性を高めることができる。 The electrode part of the lithium ion secondary battery according to the present invention, the lithium ion secondary battery using the electrode part, and the method for producing the lithium ion secondary battery are provided with an insulating coating film on the positive electrode or / and the negative electrode. Even if the positive electrode and negative electrode have protrusions and the separator breaks, the short circuit between the positive electrode and the negative electrode is effectively achieved by improving the adhesion of the insulating layer (that is, the insulating coating film) between the electrodes. Battery performance can be maintained. Moreover, since the insulating coating is formed by applying a paint having electrical insulation properties, the thickness can be reduced more easily than when a conventional insulating tape is applied, and the electrode portion and the lithium ion secondary Battery productivity can be increased.
本発明の一実施形態に係るリチウムイオン二次電池の断面図である。It is sectional drawing of the lithium ion secondary battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係るリチウムイオン二次電池の第一変形例の断面図である。It is sectional drawing of the 1st modification of the lithium ion secondary battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係るリチウムイオン二次電池の第二変形例の断面図である。It is sectional drawing of the 2nd modification of the lithium ion secondary battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係るリチウムイオン二次電池の第三変形例の断面図である。It is sectional drawing of the 3rd modification of the lithium ion secondary battery which concerns on one Embodiment of this invention.
　以下、本発明に係る電極部、リチウムイオン二次電池及びリチウムイオン二次電池の製造方法について、図面を用いて説明する。 Hereinafter, an electrode part, a lithium ion secondary battery, and a method for manufacturing a lithium ion secondary battery according to the present invention will be described with reference to the drawings.
　図１は、本発明の一実施の形態に係るリチウムイオン二次電池ＬＢの断面図であり、ここでは、上側に負極１が設けられ、下側に正極１０が設けられている。そして、負極１と正極１０との間にセパレータ２０及び電解質層２２が介在している。電極部Ｐは、正極１０と負極１とそれらの間に電解質層２２を有し、リチウムイオン二次電池を構成する。 FIG. 1 is a cross-sectional view of a lithium ion secondary battery LB according to an embodiment of the present invention, in which a negative electrode 1 is provided on the upper side and a positive electrode 10 is provided on the lower side. A separator 20 and an electrolyte layer 22 are interposed between the negative electrode 1 and the positive electrode 10. The electrode part P has the positive electrode 10, the negative electrode 1, and the electrolyte layer 22 between them, and comprises a lithium ion secondary battery.
　負極１は、例えば銅箔で構成される負極集電体（集電体）２と、その負極集電体２の上下面にそれぞれ生成された負極活物質層（活物質層）３とを有して構成されている。負極活物質層３としては、アルミニウム、黒鉛、金属シリコンあるいは金属リチウム箔等の周知の負極活物質が使用される。そして、この負極集電体２には、一方の一辺側（図１では左側）の一部から突出する端子４が設けられている。 The negative electrode 1 has a negative electrode current collector (current collector) 2 made of, for example, copper foil, and negative electrode active material layers (active material layers) 3 respectively formed on the upper and lower surfaces of the negative electrode current collector 2. Configured. As the negative electrode active material layer 3, a known negative electrode active material such as aluminum, graphite, metal silicon, or metal lithium foil is used. The negative electrode current collector 2 is provided with a terminal 4 protruding from a part of one side (left side in FIG. 1).
　負極１の集電体端部１ｅは、この負極１が例えばロール・ツー・ロール法（ＲｔｏＲ法）等によって大面積で製造された後に所望の大きさに切り出される際にカッターで切断された部分を示している。カッターの性能状態によっては、負極１の集電体端部１ｅにおいて、負極活物質層３の表面からその負極１の材料が突出する突起部（所謂、バリであり、図４参照）が生じ易い。ここで、集電体端部１ｅは、負極集電体２と負極集電体２の上下面にそれぞれ生成された負極活物質層３との積層体の端部のことである。 The current collector end 1e of the negative electrode 1 is a portion that is cut by a cutter when the negative electrode 1 is manufactured in a large area by, for example, a roll-to-roll method (RtoR method) or the like and cut into a desired size. Is shown. Depending on the performance state of the cutter, a protrusion (so-called burr, see FIG. 4) in which the material of the negative electrode 1 protrudes from the surface of the negative electrode active material layer 3 tends to occur at the current collector end 1e of the negative electrode 1. . Here, the current collector end portion 1 e is an end portion of a laminate of the negative electrode current collector 2 and the negative electrode active material layer 3 generated on each of the upper and lower surfaces of the negative electrode current collector 2.
　正極１０は、例えばアルミニウム箔から成る正極集電体（集電体）１１と、その正極集電体１１の上下面にそれぞれ生成された正極活物質層（活物質層）１２とを有して構成されている。この正極活物質層１２は、主として正極活物質とバインダーとにより構成され、必要に応じて導電助剤が添加される。 The positive electrode 10 includes a positive electrode current collector (current collector) 11 made of, for example, an aluminum foil, and positive electrode active material layers (active material layers) 12 respectively formed on the upper and lower surfaces of the positive electrode current collector 11. It is configured. The positive electrode active material layer 12 is mainly composed of a positive electrode active material and a binder, and a conductive additive is added as necessary.
　正極活物質としては、リチウムイオンを吸蔵及び放出を可逆的に進行する種々の活物質材料を用いることができる。例えば、コバルト酸リチウム、マンガン酸リチウム、ニッケル酸リチウム、チタン酸リチウム等のリチウム複合金属酸化物を用いることができる。また、負極１の負極活物質層３に金属リチウムが用いられたときは、リチウムを含まないＦｅＯＯＨやＮｉＯＯＨ等の正極活物質が用いられる。そして、この正極集電体１１には、一方の一辺側（図示の例では右側）の一部から突出して設けられている端子１３が設けられている。 As the positive electrode active material, various active material materials that reversibly advance and absorb lithium ions can be used. For example, lithium composite metal oxides such as lithium cobaltate, lithium manganate, lithium nickelate, and lithium titanate can be used. When metal lithium is used for the negative electrode active material layer 3 of the negative electrode 1, a positive electrode active material such as FeOOH or NiOOH that does not contain lithium is used. The positive electrode current collector 11 is provided with a terminal 13 that protrudes from a part of one side (right side in the illustrated example).
　正極活物質層１２の表面には、電気絶縁性を有する塗料を塗布して構成される絶縁塗膜１４が設けられている。この塗料には、このアルミナ（酸化アルミニウム（Ａｌ２Ｏ３））やシリカ（二酸化ケイ素（ＳｉＯ２））等の無機粒子を含んで構成され、塗膜の機械強度が増加されている。 The surface of the positive electrode active material layer 12 is provided with an insulating coating film 14 formed by applying an electrically insulating paint. This paint is composed of inorganic particles such as alumina (aluminum oxide (Al 2 O 3 )) and silica (silicon dioxide (SiO 2 )), and the mechanical strength of the coating film is increased.
　図１に示すように、絶縁塗膜１４は、正極１０のうち、少なくとも、負極１の集電体端部１ｅに対向する部分１０ｅに設けられる。具体的には、正極集電体１１の上下面のうち、負極１の集電体端部１ｅに対向する所定の範囲に、正極活物質層１２と連ねて設けられている。例えば、負極集電体２が銅から構成され、負極活物質層３が、活物質として酸化硅素を含む構成で構成されている場合、絶縁塗膜１４の厚みは１μｍ以上３０μｍ以下であることが好ましい。絶縁塗膜１４が上記条件を満たすと、負極１と正極１０とをセパレータ２０を介して積層した際に、仮に集電体端部１ｅに形成された突起部がセパレータ２０を貫通していても、その突起部の先端が絶縁塗膜１４の表面或いは絶縁塗膜１４内に配され、負極１と正極１０との間の短絡をより確実に防止することができる。但し、絶縁塗膜１４の厚み及び機械強度は、負極集電体２、負極活物質層３、正極集電体１１及び正極活物質層１２の材質等を考慮して、適切に設定されることが好ましい。
　なお、図１では、負極１の集電体端部１ｅ以外に、正極１０に設けられている正極活物質層１２の周囲部分にも絶縁塗膜１４が塗布されている。
　また、絶縁塗膜１４が多孔質である場合は、即ち、電気絶縁性を有する塗料が塗布されて形成された塗膜が多孔質である場合は、正極１０の表面全体に絶縁塗膜１４を形成することもできる。 As shown in FIG. 1, the insulating coating 14 is provided in at least a portion 10 e of the positive electrode 10 that faces the current collector end 1 e of the negative electrode 1. Specifically, the positive electrode current collector 11 is provided in a predetermined range facing the current collector end portion 1 e of the negative electrode 1 on the upper and lower surfaces of the positive electrode current collector 11, and is connected to the positive electrode active material layer 12. For example, when the negative electrode current collector 2 is composed of copper and the negative electrode active material layer 3 is composed of silicon oxide as an active material, the thickness of the insulating coating film 14 may be 1 μm or more and 30 μm or less. preferable. When the insulating coating film 14 satisfies the above conditions, even when the negative electrode 1 and the positive electrode 10 are laminated via the separator 20, even if the protrusion formed on the current collector end 1 e passes through the separator 20. The tip of the protruding portion is disposed on the surface of the insulating coating film 14 or in the insulating coating film 14, so that a short circuit between the negative electrode 1 and the positive electrode 10 can be more reliably prevented. However, the thickness and mechanical strength of the insulating coating film 14 should be appropriately set in consideration of the materials of the negative electrode current collector 2, the negative electrode active material layer 3, the positive electrode current collector 11 and the positive electrode active material layer 12. Is preferred.
In FIG. 1, in addition to the current collector end 1 e of the negative electrode 1, the insulating coating 14 is also applied to the peripheral portion of the positive electrode active material layer 12 provided on the positive electrode 10.
In addition, when the insulating coating film 14 is porous, that is, when the coating film formed by applying an electrically insulating paint is porous, the insulating coating film 14 is applied to the entire surface of the positive electrode 10. It can also be formed.
　セパレータ２０は、イオン透過性膜として機能するものであれば使用することができる。例えば、ポリエチレン多孔質フィルムやポリプロピレンの多孔質フィルムや不織布を用いることができる。
　電解質層２２は、公知の電解液等で構成され、外装体２４内でゲル化するゲル電解質であってもよい。 The separator 20 can be used as long as it functions as an ion permeable membrane. For example, a polyethylene porous film, a polypropylene porous film, or a nonwoven fabric can be used.
The electrolyte layer 22 may be a gel electrolyte that is made of a known electrolytic solution or the like and gels in the exterior body 24.
　負極１、正極１０及びセパレータ２０の平面形状は、それぞれ矩形を呈した相似関係を有していて、略同一の面積に形成されている。因みに、セパレータ２０の面積が一番大きく、次ぎが負極１で、正極１０が最も小さく形成されている。例えば、一例としては、セパレータ２０の長辺の長さが５６．８ｍｍ、短辺の長さが４２．６ｍｍ、負極１のそれらが５４．８ｍｍ、４１．６ｍｍ、及び正極１０のそれらが５３．８ｍｍ、４０．６ｍｍとされている。 The planar shapes of the negative electrode 1, the positive electrode 10, and the separator 20 are similar to each other having a rectangular shape, and are formed in substantially the same area. Incidentally, the area of the separator 20 is the largest, the next is the negative electrode 1, and the positive electrode 10 is the smallest. For example, as an example, the length of the long side of the separator 20 is 56.8 mm, the length of the short side is 42.6 mm, those of the negative electrode 1 are 54.8 mm, 41.6 mm, and those of the positive electrode 10 are 53. 8 mm and 40.6 mm.
　セパレータ２０を介在させた負極１及び正極１０の間には、電解質層２２が設けられている。電解質層２２には、周知の電解質、電解液を用いることができる。例えば、ＬｉＰＦ６、ＬｉＢＦ４、ＬｉＣｌＯ４のようなリチウム塩と、エチレンカーボネート（ＥＣ）及びジエチルカーボネート（ＤＥＣ）の混合溶媒との電解液等を用いることができる。 An electrolyte layer 22 is provided between the negative electrode 1 and the positive electrode 10 with the separator 20 interposed therebetween. For the electrolyte layer 22, a well-known electrolyte or electrolytic solution can be used. For example, an electrolytic solution of a lithium salt such as LiPF 6 , LiBF 4 , or LiClO 4 and a mixed solvent of ethylene carbonate (EC) and diethyl carbonate (DEC) can be used.
　上述の負極１、正極１０、セパレータ２０及び電解質層２２は、周知のリチウムイオン二次電池と同様に、これらの積層体（即ち、電極部Ｐ）がラミネートアルミフィルム等からなる外装体２４内に密封させてリチウムイオン二次電池ＬＢが製造される。電解質層２２は、負極１と正極１０との間以外に、電極部Ｐの周囲にも充填されている。 The negative electrode 1, the positive electrode 10, the separator 20, and the electrolyte layer 22 are formed in an exterior body 24 in which these laminates (that is, the electrode portion P) are made of a laminated aluminum film or the like, as in a known lithium ion secondary battery. The lithium ion secondary battery LB is manufactured by sealing. The electrolyte layer 22 is filled not only between the negative electrode 1 and the positive electrode 10 but also around the electrode part P.
　リチウムイオン二次電池ＬＢを製造する際は、例えば、先ず、負極集電体２の上下面に負極活物質を含む負極材を５μｍから１００μｍ程度の厚みで塗布した後、負極材に含まれる溶媒を乾燥除去し、負極活物質層３を形成し、負極１とする。
　次に、例えば、正極集電体１１の上下面に正極活物質を含む正極材を５μｍから１００μｍ程度の厚みで塗布した後、正極材に含まれる溶媒を乾燥除去し、正極活物質層１２を形成し、正極１０とする。
　負極１及び正極１０は、生産性を高めるために、ＲｔｏＲ法によって製造することができ、その場合は大面積の各電極部からカッター等で上述したような所望の大きさに切断し、負極１及び正極１０とする。その際に、例えば負極１の集電体端部１ｅに突起部が形成されることがある。 When manufacturing the lithium ion secondary battery LB, for example, first, a negative electrode material containing a negative electrode active material is applied to the upper and lower surfaces of the negative electrode current collector 2 with a thickness of about 5 μm to 100 μm, and then the solvent contained in the negative electrode material Is removed by drying to form the negative electrode active material layer 3, thereby forming the negative electrode 1.
Next, for example, after a positive electrode material containing a positive electrode active material is applied to the upper and lower surfaces of the positive electrode current collector 11 with a thickness of about 5 μm to 100 μm, the solvent contained in the positive electrode material is removed by drying, and the positive electrode active material layer 12 is removed. The positive electrode 10 is formed.
In order to increase productivity, the negative electrode 1 and the positive electrode 10 can be manufactured by the RtoR method. In this case, the negative electrode 1 is cut from each large-area electrode part to a desired size as described above with a cutter or the like. And the positive electrode 10. At that time, for example, a protrusion may be formed on the current collector end 1 e of the negative electrode 1.
　次に、電気絶縁性を有する塗液を、例えばダイ方式、グラビア方式等の公知の塗工方法で、正極１０のうち、少なくとも、図１に示すように負極１の集電体端部１ｅに対向する部分に、塗布し、絶縁塗膜１４を形成する工程を行う。
　その後、突起部６を絶縁塗膜１４に対向させる形で、セパレータ２０を介して負極１と正極１０とを積層し、これらを外装体２４で仮封止したラミネートセルを得る。セルを仮封止する際、端子４，１３をそれぞれ外装体２４の外部に突出させる。続いて、ラミネートセルの仮封止を部分的に解いて、電解質層２２を形成した後で完全に封止する。以上の工程により、図１に示すリチウムイオン二次電池ＬＢが得られる。 Next, an electrically insulating coating liquid is applied to at least the current collector end 1e of the negative electrode 1 as shown in FIG. 1 by using a known coating method such as a die method or a gravure method. The process of apply | coating to the opposing part and forming the insulating coating film 14 is performed.
Then, the negative electrode 1 and the positive electrode 10 are laminated | stacked through the separator 20 in the form which makes the protrusion part 6 oppose the insulating coating film 14, and the laminate cell which sealed these temporarily with the exterior body 24 is obtained. When temporarily sealing the cell, the terminals 4 and 13 are protruded from the exterior body 24, respectively. Subsequently, the temporary sealing of the laminate cell is partially unwound, and after the electrolyte layer 22 is formed, it is completely sealed. Through the above steps, the lithium ion secondary battery LB shown in FIG. 1 is obtained.
　上記構成からなる正極１０、リチウムイオン二次電池ＬＢ及びその製造方法では、正極１０に絶縁塗膜１４が設けられているので、仮に負極１の集電体端部１ｅにバリ等の突起部が形成されていてセパレータ２０が破損しても、負極１と正極１０との短絡を効果的に防止することができる。また、電極間の絶縁塗膜１４の密着性を向上させることで、リチウムイオン二次電池ＬＢの性能を維持することができる。しかも、絶縁塗膜１４は電気絶縁性を有する塗膜を塗布するだけで形成することができるので、従来の絶縁テープを張着するよりも簡単に行い、電極部Ｐ及びリチウムイオン二次電池ＬＢの生産性を高めることができる。しかも、絶縁塗膜１４の厚みは１０μｍ程度とすることができるので、従来の絶縁テープ厚の３５μｍより薄く、電池性能の低下を抑制することができる。また、絶縁塗膜１４が多孔質である場合は、正極１０の正極活物質層１２の接触面積の低下を抑制することができる。 In the positive electrode 10, the lithium ion secondary battery LB having the above-described configuration, and the manufacturing method thereof, since the insulating coating 14 is provided on the positive electrode 10, provisional portions such as burrs are temporarily formed on the current collector end 1 e of the negative electrode 1. Even if it is formed and the separator 20 is broken, the short circuit between the negative electrode 1 and the positive electrode 10 can be effectively prevented. Moreover, the performance of the lithium ion secondary battery LB can be maintained by improving the adhesion of the insulating coating film 14 between the electrodes. In addition, since the insulating coating film 14 can be formed simply by applying a coating film having electrical insulating properties, it is easier to apply than the conventional insulating tape, and the electrode portion P and the lithium ion secondary battery LB. Can increase productivity. And since the thickness of the insulating coating film 14 can be about 10 micrometers, it is thinner than 35 micrometers of the conventional insulation tape thickness, and can suppress the fall of battery performance. Moreover, when the insulating coating film 14 is porous, the fall of the contact area of the positive electrode active material layer 12 of the positive electrode 10 can be suppressed.
　また、上記構成からなる電極部Ｐ及びリチウムイオン二次電池ＬＢでは、絶縁塗膜１４（即ち、電気絶縁性を有する塗料）がアルミナやシリカ等の無機粒子を含んで構成されるので、機械的強度に優れた絶縁塗膜１４を形成することができる。 In addition, in the electrode part P and the lithium ion secondary battery LB having the above-described configuration, the insulating coating film 14 (that is, the paint having electrical insulation) is configured to include inorganic particles such as alumina and silica. The insulating coating film 14 having excellent strength can be formed.
　また、上記構成からなる電極部Ｐ及びリチウムイオン二次電池ＬＢでは、絶縁塗膜が多孔質であるので、正極活物質層１２及び負極活物質層３の接触面積の低下を抑制することができる。 Moreover, in the electrode part P and the lithium ion secondary battery LB having the above-described configuration, since the insulating coating film is porous, it is possible to suppress a decrease in the contact area between the positive electrode active material layer 12 and the negative electrode active material layer 3. .
　以上、本発明によるその実施の形態について説明したが、本発明は上記の実施の形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。
　例えば、絶縁塗膜１４を多孔質とし、絶縁塗膜１４の小孔でセパレータ２０のイオン透過機能を達成する場合は、セパレータ２０を省略し、厚みを適切に調節した絶縁塗膜１４のみを正極活物質層１２上に設けてもよい。 The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.
For example, when the insulating coating film 14 is porous and the ion permeation function of the separator 20 is achieved by the small holes of the insulating coating film 14, the separator 20 is omitted and only the insulating coating film 14 whose thickness is appropriately adjusted is the positive electrode. It may be provided on the active material layer 12.
　また、上記実施形態では、図１に示すように、絶縁塗膜１４が正極１０のうち負極１の集電体端部１ｅに対向する正極集電体１１の上下面に、正極活物質層１２と連ねて設けられている例について説明したが、このような形態に限定されることはない。例えば、図２に示すように、絶縁塗膜１４は正極集電体１１とは反対側の正極活物質層１２の表面上に設けられていてもよい。また、図３に示すように、絶縁塗膜１４は、正極活物質層１２の端部よりの表面から端部を覆うと共に、負極１の集電体端部１ｅに対向する正極集電体１１の上下面に亘って設けられていてもよい。また、図４に示すように、負極１の集電体端部１ｅに突起部６が形成された場合に、絶縁塗膜１４は突起部６を直接被覆するように設けられていてもよい。
　さらに、上述した実施形態の負極１と正極１０とが逆であってもよい。つまり、正極１０の集電体端部と、負極のうち正極の集電体端部に対向する部分とが絶縁塗膜１４によって被覆されていてもよい。 Further, in the above embodiment, as shown in FIG. 1, the positive electrode active material layer 12 is formed on the upper and lower surfaces of the positive electrode current collector 11 with the insulating coating 14 facing the current collector end 1 e of the negative electrode 1 in the positive electrode 10. However, the present invention is not limited to such a form. For example, as shown in FIG. 2, the insulating coating film 14 may be provided on the surface of the positive electrode active material layer 12 on the side opposite to the positive electrode current collector 11. Further, as shown in FIG. 3, the insulating coating film 14 covers the end portion from the surface of the positive electrode active material layer 12 from the end portion, and faces the current collector end portion 1 e of the negative electrode 1. It may be provided over the upper and lower surfaces. As shown in FIG. 4, when the protrusion 6 is formed on the current collector end 1 e of the negative electrode 1, the insulating coating film 14 may be provided so as to directly cover the protrusion 6.
Furthermore, the negative electrode 1 and the positive electrode 10 of the above-described embodiment may be reversed. That is, the current collector end portion of the positive electrode 10 and the portion of the negative electrode facing the current collector end portion of the positive electrode may be covered with the insulating coating film 14.
　また、本発明の趣旨を逸脱しない範囲で、上記した実施の形態における構成要素を周知の構成要素に置き換えることは適宜可能である。 Moreover, it is possible to appropriately replace the constituent elements in the above-described embodiments with known constituent elements without departing from the gist of the present invention.
　１　負極
　１ｅ　集電体端部
　２　負極集電体（集電体）
　３　負極活物質層（活物質層）
１０　正極
１０ｅ　集電体端部に対向する部分
１１　正極集電体（集電体）
１２　正極活物質層（活物質層）
１４　絶縁塗膜
２０　セパレータ
２２　電解質
ＬＢ　リチウムイオン二次電池
Ｐ　電極部 DESCRIPTION OF SYMBOLS 1 Negative electrode 1e Current collector edge part 2 Negative electrode current collector (current collector)
3 Negative electrode active material layer (active material layer)
DESCRIPTION OF SYMBOLS 10 Positive electrode 10e The part 11 which opposes an electrical power collector edge part Positive electrode electrical power collector (current collector)
12 Positive electrode active material layer (active material layer)
14 Insulating coating film 20 Separator 22 Electrolyte LB Lithium ion secondary battery P Electrode part

Claims (6)

  1. 　正極と負極とその間に電解質層を有するリチウムイオン二次電池の電極部であって、
    　前記正極と前記負極は、集電体とその表面に積層された活物質層からなり、
    　前記正極と前記負極の集電体端部と、前記正極と前記負極のそれぞれに積層される別の前記負極と前記正極の前記集電体端部に対向する部分と、が絶縁塗膜によって被膜されているリチウムイオン二次電池の電極部。     An electrode portion of a lithium ion secondary battery having a positive electrode, a negative electrode, and an electrolyte layer therebetween,
    The positive electrode and the negative electrode are each composed of a current collector and an active material layer laminated on the surface thereof.
    A current collector end portion of the positive electrode and the negative electrode, another negative electrode laminated on each of the positive electrode and the negative electrode, and a portion facing the current collector end portion of the positive electrode are coated with an insulating coating film. The electrode part of the lithium ion secondary battery which is made.
  2. 　正極と負極とその間に電解質層を有するリチウムイオン二次電池の電極部であって、
    　前記正極と前記負極の端部に形成される突起部と、前記突起部が形成された前記正極と前記負極のそれぞれに積層される別の前記負極と前記正極の前記突起部に対向する部分と、が絶縁塗膜によって被膜されているリチウムイオン二次電池の電極部。     An electrode portion of a lithium ion secondary battery having a positive electrode, a negative electrode, and an electrolyte layer therebetween,
    A protrusion formed at an end of the positive electrode and the negative electrode; another negative electrode stacked on each of the positive electrode and the negative electrode on which the protrusion is formed; and a portion facing the protrusion of the positive electrode; , Is an electrode part of a lithium ion secondary battery coated with an insulating coating film.
  3. 　前記絶縁塗膜は、アルミナやシリカ等の無機粒子を含んで構成されている請求項１又は請求項２に記載のリチウムイオン二次電池の電極部。 The electrode part of the lithium ion secondary battery according to claim 1 or 2, wherein the insulating coating film is configured to include inorganic particles such as alumina and silica.
  4. 　前記絶縁塗膜は多孔質である請求項１から請求項３の何れか一項に記載のリチウムイオン二次電池の電極部。 The electrode part of the lithium ion secondary battery according to any one of claims 1 to 3, wherein the insulating coating film is porous.
  5. 　請求項１から請求項４の何れか一項に記載のリチウムイオン二次電池の電極部を備えたリチウムイオン二次電池。 The lithium ion secondary battery provided with the electrode part of the lithium ion secondary battery as described in any one of Claims 1-4.
  6. 　請求項１から請求項４の何れか一項に記載のリチウムイオン二次電池の電極部を備えたリチウムイオン二次電池の製造方法であって、
    　前記正極と前記負極の集電体端部と、前記正極と前記負極のそれぞれに積層される別の前記負極と前記正極の前記集電体端部に対向する部分と、を絶縁塗膜によって被膜する工程を有するリチウムイオン二次電池の製造方法。     It is a manufacturing method of the lithium ion secondary battery provided with the electrode part of the lithium ion secondary battery as described in any one of Claims 1-4,
    A current collector end portion of the positive electrode and the negative electrode, another negative electrode laminated on each of the positive electrode and the negative electrode, and a portion facing the current collector end portion of the positive electrode are coated with an insulating coating film The manufacturing method of the lithium ion secondary battery which has the process to carry out.
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