WO2013031889A1 - 電池用電極の製造方法 - Google Patents
電池用電極の製造方法 Download PDFInfo
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- WO2013031889A1 WO2013031889A1 PCT/JP2012/072002 JP2012072002W WO2013031889A1 WO 2013031889 A1 WO2013031889 A1 WO 2013031889A1 JP 2012072002 W JP2012072002 W JP 2012072002W WO 2013031889 A1 WO2013031889 A1 WO 2013031889A1
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- positive electrode
- electrode
- application part
- active material
- battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
- Y10T29/49115—Electric battery cell making including coating or impregnating
Definitions
- the present invention relates to a method of manufacturing a battery electrode, and more particularly to a method of manufacturing a battery electrode in which an electrode active material layer is formed on a thin current collector.
- a positive electrode such as a lithium ion battery, a negative electrode, a coated portion in which a positive electrode mixture and a negative electrode mixture are applied to metal foil surfaces of a positive electrode current collector and a negative electrode current collector, and a non-coated portion After being formed, it is manufactured by cutting to a predetermined size after drying.
- the positive electrode current collector, the positive electrode lead tab for conducting current between the negative electrode collector, and the negative electrode lead tab as the positive electrode current collector the non-coated portion of the negative electrode current collector Cutting out from the same time is also performed (see, for example, Patent Document 1).
- FIG. 6 is a diagram for explaining a conventional method of cutting an electrode.
- FIG. 6A is a plan view illustrating a positive electrode base material.
- 6B and 6C are cross-sectional views illustrating a cutting process of cutting the positive electrode substrate by a cutting device.
- FIG. 6B and 6C show cross-sectional views taken along the line CC 'through the positive electrode lead tab forming portion 113 of the positive electrode substrate 102 shown in FIG. 6A.
- the positive electrode base material 102 is attached to the cutting device 500, held from above on the positive electrode active material layer 103 from both sides by the upper stripper 510 and the lower stripper 530, and held by the anvil 540.
- the positive electrode portion 110 acting as a battery reaction portion of the positive electrode 100 is sandwiched on both sides by the upper stripper 510 and the lower stripper 530.
- the cutting blades 520 and 522 provided at both ends of the upper stripper 510 descend from the top, and the lower stripper 510 is lifted to cut the positive electrode cutting body 106.
- the positive electrode extraction tab forming portion 113 is not held and held from both sides by the upper stripper 510 and the lower stripper 530, and therefore, when cutting by the cutting blade 520, a force in the moving direction of the cutting blade 520 acts. As shown in FIG. 3C, deformation or wrinkling may occur.
- the present invention uses a positive electrode active material or a negative electrode active material when cutting a positive electrode active material or a positive electrode active material or negative electrode active material coated on a current collector made of metal foil.
- a method of manufacturing a battery electrode capable of providing a laminated secondary battery having a positive electrode with excellent quality and a negative electrode when the positive electrode lead tab and the negative electrode lead tab are integrally manufactured from a portion not coated , And providing a battery manufactured thereby.
- the present invention is to solve the above-mentioned problems, and the non-coating is carried out from a strip-like electrode provided with a coating portion in which an active material is formed on a current collector and a non-coating portion in which no active material is formed.
- the present invention is a method of manufacturing a battery electrode for separating a battery electrode of a desired size from a strip electrode in which an active material is intermittently applied on a current collection band, and the strip electrode is the n-th coating Part, an n-th non-coating part in contact with the n-th coating part, and an (n + 1) -th coating part in contact with the n-th non-coating part on the opposite side to the n-th coating part It is a manufacturing method of the battery electrode cut including at least the n-th application part, the n-th non-application part, and the n + 1-th application part.
- the strip electrode is connected to the n-th coating portion, the n-th non-coating portion contacting the n-th coating portion, and the n-th It has an (n is 1 or more) n + 1 coated portion which is in contact with the non coated portion on the opposite side to the n coated portion (n is 1 or more), and at least the n th coated portion, the n th non coated portion, the n + 1 And a negative electrode prepared in the same manner as the positive electrode, and the positive electrode cut including the coated portion of the present invention is laminated via a separator.
- substantially on the same plane means that the current collector surface of the coated portion and the current collector surface of the non-coated portion to be the electrode lead-out tab are on the same plane such as a horizontal surface, and the same surface It also means that there is a slight inclination that produces the same effect as that of.
- the positive electrode lead tab forming portion and the negative electrode lead tab forming portion respectively Since the portion coated with the positive electrode active material layer and the negative electrode active material layer is held and cut, the cutting portion is a positive electrode extraction tab forming portion using a foil-like current collector, and the negative electrode extraction tab forming portion as well. It is possible to provide a battery electrode with stable quality without causing wrinkles or deformation.
- FIG. 1 is a figure explaining an example of the manufacturing process of a positive electrode and a negative electrode.
- FIG. 2 is a view for explaining a method of manufacturing an electrode laminate in which a positive electrode and a negative electrode are stacked to face each other via a separator.
- FIG. 3 is a view for explaining an embodiment of the method for cutting a battery electrode of the present invention, and is a view for explaining a method for cutting a positive electrode.
- FIG. 4 is a figure explaining another example of the manufacturing process of a positive electrode and a negative electrode.
- FIG. 5 is a diagram for explaining another embodiment of the battery electrode cutting method of the present invention, and is a diagram for explaining the positive electrode cutting method.
- FIG. 6 is a view for explaining a conventional method of cutting a positive electrode.
- FIG. 1 is a figure explaining an example of the manufacturing process of a positive electrode and a negative electrode.
- the positive electrode and the negative electrode are manufactured by the same method except that the constituent materials are different. Therefore, in the following description, the positive electrode will be described.
- the positive electrode is formed by intermittently applying a slurry-like positive electrode mixture on both sides on a positive electrode current collector made of a strip-like aluminum foil, drying it, compressing it with a roller press, etc. as necessary. It manufactures by cut
- a lithium-containing composite oxide such as lithium manganese composite oxide, lithium cobalt composite oxide, lithium nickel composite oxide and the like, a conductive material such as carbon black, and a binder such as polyvinylidene fluoride Etc. may be dispersed in N-methyl-2-pyrrolidone to make a slurry.
- a positive electrode active material layer 103 is intermittently formed in a portion shown by a shaded portion on a positive electrode current collector 101 in which a positive electrode active material is coated on the surface.
- the positive electrode active material layer 103 is intermittently formed in a larger area than the positive electrode portion outer outline 104 represented by a broken line.
- both side surface portions 105a and 105b in the length direction of the positive electrode current collector 101 coated with the active material are cut along a predetermined positive electrode outline, to obtain a positive electrode base material 102 shown in FIG. 1B.
- the positive electrode substrate is formed of a straight portion and a curved portion such as a quarter circle at both ends. It cuts along the disconnection 110. At the same time as cutting by the first cutting line 110, the cutting body 106 for positive electrode shown in FIG.
- the positive electrode active material layer 103 remains on the front end portion 114 by cutting in a state in which both surfaces of the positive electrode active material layer 103 in the vicinity of the front end portion 114 of the positive electrode lead tab forming portion 113 are held.
- the positive electrode lead tab forming portion 113 is cut by cutting the member in which the positive electrode active material layer 103 is left adjacent to the tip end portion 114 of the positive electrode lead tab forming portion 113. Since the portions adjacent to each other are held from both sides, the positive electrode lead tab forming portion 113 is reliably held at the time of cutting, so that no wrinkles or deformed portions are generated in the positive electrode lead tab forming portion 113.
- the positive electrode active material is applied to the positive electrode extraction tab forming the positive electrode extraction tab forming portion 113.
- the tip portion 114 is cut and removed only to obtain the positive electrode 100 having the positive electrode lead-out tab of the predetermined dimension shown in FIG. 1D.
- FIG. 2 is a view for explaining a method of manufacturing an electrode laminate in which a positive electrode and a negative electrode are stacked to face each other via a separator.
- An electrode laminate 400 is produced by laminating the positive electrode cut-out body 106 having the positive electrode lead-out tab forming portion 113 and the negative electrode lead-out tab formed portion 213 and the negative electrode cut portion 206 via the separator 300. A plurality of points are fixed from both sides so that the fixing tape 410 does not shift.
- the positive electrode lead tab formation portion 113 and the negative electrode lead tab formation portion 213 drawn out of the electrode laminate are collectively joined together by ultrasonic bonding means or the like to be integrated.
- the tip portion 114 coated with the positive electrode active material layer of the integrated positive electrode lead tab forming portion and the tip portion 214 coated with the negative electrode active material layer of the integrated negative electrode lead tab forming portion 213 are respectively cut.
- the electrode stack 400 in which the positive electrode extraction tab 115 and the negative electrode extraction tab 215 are integrally joined is completed.
- the completed electrode laminate 400 is sealed with a film-like sheathing material, or housed in a square container and injected with an electrolytic solution to complete a battery.
- FIG. 3 is a view for explaining the method for cutting an electrode of the present invention, and is a view for explaining a method for producing a cut body for a positive electrode.
- FIG. 3A is a plan view illustrating a positive electrode substrate.
- FIG. 3B and FIG. 3C are cross-sectional views for explaining a cutting process of cutting the positive electrode substrate by a cutting device.
- FIGS. 3B and 3C show cross-sectional views taken along the line AA ′ of the positive electrode lead tab forming portion 113 of the positive electrode base material 102 shown in FIG. 3A. As shown in FIG.
- the positive electrode base material 102 is attached to the cutting device 500, held on both sides by the upper stripper 510 and the lower stripper 530, and held by the anvil 540.
- the positive electrode substrate 102 is not only opposite to the first coated portion 103 a acting as a positive electrode, but also opposite to the n th non-coated portion 103 b adjacent to the n th coated portion 103 a.
- the n + 1-th application part 103c which is located on the side and forms a part to be cut after the positive electrode forming part 113 and its surrounding part is also sandwiched on both sides by the upper stripper 510 and the lower stripper 530.
- the lower stripper 530 ascends to the leading end of the positive electrode lead tab formation portion 113 by the second cutting line 112 for taking out the positive electrode lead tab.
- the positive electrode lead tab forming portion 113 with the positive electrode active material layer 103 remaining and the first cutting line 110 on the opposite side of the portion from which the positive electrode lead tab forming portion is pulled out are simultaneously cut to obtain the positive electrode cut body 106.
- the upper stripper 510 and the cutting blades 520 and 522 are lifted, so that the positive electrode cutting body 106 can be taken out.
- the positive electrode cut body 106 taken out of the cutting device 500 can manufacture a positive electrode by cutting the tip end portion remaining on the positive electrode lead tab forming portion 113 to which the positive electrode active material is applied.
- FIG. 4 is a figure explaining another example of the manufacturing process of a positive electrode and a negative electrode. Also in this example, since the positive electrode and the negative electrode can be manufactured by the same method except for the difference in their constituent materials, the positive electrode will be described in the following description.
- a positive electrode active material layer 103 is formed on a portion indicated by a shaded portion on the positive electrode current collector 101 in which the positive electrode active material is coated on the surface.
- positive electrode active material layers 103d and 103e are formed in portions shown by hatching.
- the positive electrode is formed by applying a slurry-like positive electrode mixture on a positive electrode current collector made of strip-like aluminum foil, drying to form a positive electrode active material layer, and compressing by a roller press or the like as necessary. It is produced by molding and cutting into a predetermined size from the positive electrode base material. Both side portions 105a and 105b in the lengthwise direction of the positive electrode current collector 101 coated with the active material are cut along a predetermined positive electrode outline, to obtain a positive electrode substrate 102 shown in FIG. 4B.
- a non-coated portion where the positive electrode active material is not formed is left along the coating direction between the positive electrode active material coated portions 103d and 103e to which the positive electrode mixture is applied in this example. Is produced by being punched into the shape of the positive electrode portion outline 104 represented by a broken line.
- the positive electrode lead-out tab forming portion 113 is cut out and removed after the positive electrode cutting body 106 having the front end portion 114 coated with the positive electrode active material layer is punched out. By doing so, it is possible to obtain the positive electrode 100 provided with the positive electrode lead-out tab of the predetermined dimension shown in FIG. 4D.
- the positive electrode mixture the same one as that described in describing FIG. 1 can be used.
- FIG. 5 is a diagram for explaining the method of cutting the electrode described in FIG. 4 and is a diagram for explaining the method of producing the positive electrode cut body.
- the positive electrode base material 106 is not only the positive electrode active material layer 103d serving as a positive electrode but also the positive electrode active material layer 103e at the tip of the positive electrode lead tab. Since the upper and lower strippers 510 and 530 sandwich both surfaces, the current collector surface of the portion acting as the positive electrode and the current collector surface of the tip portion of the positive electrode lead tab are held on the same plane. . As a result, it is possible to prevent the occurrence of wrinkles in the cut portion and deformation, so that a positive electrode lead tab forming portion with excellent quality can be obtained.
- the positive electrode active material layer 103e at the tip of the positive electrode lead tab is independent of the portion acting as the positive electrode, the positive electrode active material layer 103e is made of a synthetic resin composition containing no positive electrode active material. By applying the same thickness as the active material layer, the effects of the present invention can be obtained as in the case of applying the positive electrode active material.
- the cut product for positive electrode and the cut product for negative electrode prepared as in these examples are laminated through a separator, and stored in a film-like packaging material or a battery can made of metal, and the electrolyte is injected after injection.
- the battery can be manufactured by sealing.
- an electrode base material in which an electrode active material is intermittently applied to a current collector made of a thin metal foil is cut by a cutting step to make a positive electrode lead tab and a negative electrode lead tab.
- Positive electrode lead tab 206 ⁇ ⁇ ⁇ Cut body for negative electrode, 213 ⁇ ⁇ ⁇ Negative electrode lead tab forming portion, 214 ⁇ ⁇ ⁇ Tip portion, 215 ⁇ Negative electrode lead tab, 300 ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ Electrode laminate, 410 ... fixed tape, 500 ... cutting device, 10 ... upper stripper, 520 ... cutting blade, 522 ... cutting blade, 530 ... lower stripper, 540 ... anvil
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Abstract
Description
正極電極、負極電極の切断時には、正極集電体、負極集電体との間で電流の通電を行うための正極引出タブ、負極引出タブを正極集電体、負極集電体の非塗布部から同時に切り出すことも行われている(例えば、特許文献1参照)。
図6は、従来の電極の切断方法を説明する図である。
図6Aは、正極電極基材を説明する平面図である。図6B、および図6Cは、正極電極基材を切断装置によって切断する切断過程を説明する断面図である。
図6Aで示す正極電極基材102の正極引出タブ形成部113をとおるC-C’線の断面図を図6Bおよび図6Cで示す。
図6Bで示すように、正極電極基材102を切断装置500に装着し、上部ストリッパー510と下部ストリッパー530によって両面から正極活物質層103上から挟持するとともに、アンビル540によって保持している。
正極電極基材102は、正極電極100の電池反応部として作用する正極電極部110が上部ストリッパー510と下部ストリッパー530によって両面が挟持されている。
上部ストリッパー510の両端部に設けた切断刃520,522が上部から下降するとともに、下部ストリッパー510が上昇して正極電極用切断体106が切断される。
前記電池用電極の第n+1の塗布部を切除する前記の電池用電極の製造方法である。
電池用電極がリチウムイオン二次電池用の電極である前記の電池用電極の製造方法である。
なお、本発明において略同一平面上とは、記塗布部の集電体面と前記電極引出タブとなる前記非塗布部の集電体面とが水平面等の同一平面上にあるもの、および同一平面上にあるものと同様の効果が得られるわずかな傾きがあるものも意味する。
図1は、正極電極、負極電極の製造工程の一例を説明する図である。
正極電極、負極電極は、その構成材料が相違するのみで同様の方法によって作製されているので、以下の説明においては正極電極について説明する。
正極電極は、帯状のアルミニウム箔からなる正極集電体上に、スラリー状の正極合剤を間欠的に両面に塗布し、乾燥後、必要に応じてローラープレス機等によって圧縮して成型を行い正極電極基材から所定の大きさに切断することによって作製する。
正極合剤としては、リチウムマンガン複合酸化物、リチウムコバルト複合酸化物、リチウムニッケル複合酸化物等のリチウムを含有する複合酸化物と、カーボンブラック等の導電性材料、ポリフッ化ビニリデン等の結着剤等をN-メチル-2-ピロリドンに分散させてスラリー状としたものを用いることができる。
次いで、活物質を塗布した正極集電体101の長さ方向の両側面部105a、105bを所定の正極電極外形線に沿って切断して、図1Bに示す正極電極基材102を得る。
このように、正極引出タブ形成部113の先端部114の近傍の正極活物質層103の両面を挟持した状態で切断することで先端部114に正極活物質層103が残留する。
正極引出タブ形成部113および負極引出タブ形成部213を有した正極電極用切断体106と負極電極用切断体206とをセパレーター300を介して積層して電極積層体400を作製したものであって、固定テープ410でずれが生じないように複数の個所が両面から固定されている。
次いで、電極積層体から引き出された正極引出タブ形成部113および負極引出タブ形成部213を、それぞれまとめて超音波接合手段等によって相互に接合して一体化する。一体化した正極電極引出タブ形成部の正極活物質層を塗布した先端部114、および一体化した負極引出タブ形成部213の負極活物質層を塗布した先端部214をそれぞれ切断する。以上の様にして正極引出タブ115、負極引出タブ215を一体に接合した電極積層体400が完成する。
完成した電極積層体400は、フィルム状外装材で封口したり、角形容器に収納して電解液を注液することによって電池が完成する。
図3は、本発明の電極の切断方法を説明する図であり、正極電極用切断体の作製方法を説明する図である。
図3Aは、正極電極基材を説明する平面図である。図3Bおよび図3Cは、正極電極基材を切断装置によって切断する切断過程を説明する断面図である。
図3Aで示す正極電極基材102の正極引出タブ形成部113をとおるA-A’線の断面図を図3Bおよび図3Cで示す。
図3Bで示すように、正極電極基材102を切断装置500に装着し、上部ストリッパー510と下部ストリッパー530によって両面から挟持するとともに、アンビル540によって保持する。
正極電極基材102は、正極電極として作用する部分である第一の塗布部103aのみではなく、第nの塗布部103aと隣接する第nの非塗布部103bと第nの塗布部とは反対側に位置し、正極電極形成部113の後に切断される部分およびその周囲の部分を構成する第n+1の塗布部103cも上部ストリッパー510と下部ストリッパー530によって両面が挟持されている。
この工程後、上部ストリッパー510、切断刃520,522が上昇するので正極電極用切断体106を取り出すことができる。切断装置500から取り出した正極電極用切断体106は、正極引出タブ形成部113に残存した先端部の正極活物質を塗布した部分を切断することで正極電極を作製することができる。
また、正極電極切断工程と同様の工程によって負極電極用切断体を作製することができる。
本例においても正極電極、負極電極は、その構成材料が相違するのみで同様の方法によって作製できるので、以下の説明においては正極電極について説明する。
図4Aに示すように、表面に正極活物質を塗布した正極集電体101には、網掛け部で示す部分に正極活物質層103が形成されている。
正極集電体101には、網掛け部で示す部分に正極活物質層103dと103eが形成されている。正極電極は、帯状のアルミニウム箔からなる正極集電体上に、スラリー状の正極合剤を塗布し、乾燥して正極活物質層を形成後、必要に応じてローラープレス機等によって圧縮して成型を行い正極電極基材から所定の大きさに切断することによって作製される。活物質を塗布した正極集電体101の長さ方向の両側面部105a、105bを所定の正極電極外形線に沿って切断して、図4Bに示す正極電極基材102を得る。
次いで、図4Cに示すように打ち抜いて、正極引出タブ形成部113に正極活物質層が塗布された先端部114を有する正極電極用切断体106を作製した後に、先端部114を切断して除去するのみで図4Dに示す所定の寸法の正極引出タブを備えた正極電極100を得ることができる。
正極合剤としては、図1を説明する際に述べたものと同様のものを用いることができる。
本例においても図3Bで説明したのと同様に、正極電極基材106は、正極電極として作用する部分である正極活物質層103dのみではなく、正極引出タブの先端部の正極活物質層103eも上部ストリッパー510と下部ストリッパー530によって両面が挟持されていることから、正極電極として作用する部分の集電体面と、正極引出タブの先端部の集電体面は、同一平面上に保持されている。これによって、切断部にしわが生じることや変形することを防ぐことができるので品質の優れた正極引出タブ形成部が得られ、その結果、性能の優れた二次電池を作製することができる。
また、正極引出タブの先端部の正極活物質層103eは、正極電極として作用する部分とは独立しているので、正極活物質層103eには、正極活物質を含有しない合成樹脂組成物を正極活物質層と同一の厚さとなるように塗布することによっても、正極活物質を塗布した場合と同様に本発明の効果を得ることができる。
Claims (6)
- 集電体上に活物質が形成された塗布部と、活物質が形成されていない非塗布部とを備えた帯状電極から、前記非塗布部が電極引出タブとなるように電池用電極を分離する電池用電極の製造方法であって、前記塗布部の集電体面と前記電極引出タブとなる前記非塗布部の集電体面とを同一平面上に保持して切断することを特徴とする電池用電極の製造方法。
- 活物質が集電帯上に間欠的に塗布された帯状電極から所望のサイズの電池用電極を分離する電池用電極の製造方法であって、
前記帯状電極は第nの塗布部と、前記第nの塗布部に接する第nの非塗布部と、前記第nの非塗布部の前記第nの塗布部とは反対側で接する第n+1の塗布部を有し(nは正の整数)、少なくとも前記第nの塗布部、前記第nの非塗布部、前記第n+1の塗布部を含んで切断することを特徴とする請求項1記載の電池用電極の製造方法。 - 前記電池用電極の第n+1の塗布部を切除することを特徴とする請求項2記載の電池用電極の製造方法。
- 電池用電極がリチウムイオン二次電池用の電極であることを特徴とする請求項1から3のいずれか1項記載の電池用電極の製造方法。
- 活物質が集電帯上に間欠的に塗布された帯状電極から前記帯状電極は第nの塗布部と、前記第nの塗布部に接する第nの非塗布部と、前記第nの非塗布部の前記第nの塗布部とは反対側で接する第n+1の塗布部を有し(nは正の整数)、
少なくとも前記第nの塗布部、前記第nの非塗布部、前記第n+1の塗布部を含んで切断した正極電極と、
前記正極電極と同様に作製した負極電極をセパレーターを介して積層したことを特徴とする電池。 - 前記塗布部と、前記第nの塗布部に接する第nの非塗布部と、前記第nの非塗布部の前記第nの塗布部とは反対側で接する第n+1の塗布部を有し(nは正の整数)、
少なくとも前記第nの塗布部、前記第nの非塗布部、前記第n+1の塗布部を含んで切断した正極電極から第n+1の塗布部を切断した正極電極と、
前記正極電極と同様に作製した負極電極をセパレーターを介して積層した電極積層体を備えたことを特徴とする請求項5記載の電池。
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