JP2006172807A - Method of manufacturing electrode plate - Google Patents

Method of manufacturing electrode plate Download PDF

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JP2006172807A
JP2006172807A JP2004361315A JP2004361315A JP2006172807A JP 2006172807 A JP2006172807 A JP 2006172807A JP 2004361315 A JP2004361315 A JP 2004361315A JP 2004361315 A JP2004361315 A JP 2004361315A JP 2006172807 A JP2006172807 A JP 2006172807A
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electrode plate
current collector
active material
supply roll
collector body
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Masato Fujita
正人 藤田
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Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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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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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of continuously manufacturing a collector body while keeping tensile strength and stickness without generating wrinkle by thermal shrinkage. <P>SOLUTION: In the manufacturing method of an electrode plate consists of at least a process for supplying the collector body from an electrode plate supply roll, a process for coating a coating composition for an electrode active material layer on the collector body and a process for drying the coated composition for the electrode active material, the collector body is continuously supplied as a final end part of the collector body supplied from a preceding electrode plate supply roll and a collector body tip end part of the next electrode plate are connected by using a silicone adhesive tape when replacing the electrode plate supply roll. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、電極板、特にリチウムイオン二次電池に代表される非水電解液二次電池用の電極板の製造方法に関する。   The present invention relates to a method for producing an electrode plate, particularly an electrode plate for a non-aqueous electrolyte secondary battery represented by a lithium ion secondary battery.

近年、電子機器や通信機器の小型化および軽量化が急速に進んでおり、これらの駆動用電源として用いられる二次電池に対しても小型化および軽量化が要求されている。このため、従来のアルカリ蓄電池に代わり、高エネルギー密度で高電圧を有する非水電解液二次電池、代表的にはリチウムイオン二次電池が提案されている。   In recent years, electronic devices and communication devices are rapidly becoming smaller and lighter, and secondary batteries used as power sources for driving these devices are also required to be smaller and lighter. For this reason, in place of the conventional alkaline storage battery, a non-aqueous electrolyte secondary battery having a high energy density and a high voltage, typically a lithium ion secondary battery has been proposed.

二次電池は、正極電極板と負極電極板それぞれに電流を取り出すための端子を取り付け、両電極板の間に短絡を防止するためのセパレータを挟んで巻き取り、非水電解質溶液を満たした容器に密封することにより組み立てられる。   The secondary battery is equipped with a terminal for taking out current in each of the positive electrode plate and the negative electrode plate, wound with a separator for preventing a short circuit between both electrode plates, and sealed in a container filled with a non-aqueous electrolyte solution It is assembled by doing.

非水電解液二次電池の電極板は、正又は負極活物質として用い、そのような活物質と結着材（バインダー）とを適当な湿潤剤（溶剤）に分散または溶解させてスラリー状の塗工組成物を調製し、当該塗工組成物を金属箔からなる集電体上に塗工して正又は負極活物質層を形成することにより作製される。   The electrode plate of the nonaqueous electrolyte secondary battery is used as a positive or negative electrode active material, and such an active material and a binder (binder) are dispersed or dissolved in an appropriate wetting agent (solvent) to form a slurry. It is produced by preparing a coating composition and coating the coating composition on a current collector made of a metal foil to form a positive or negative electrode active material layer.

塗工工程は、例えば図２に示したような工程からなる。集電体１７が、電極板供給ロール１９から繰り出され、搬送路上を走行し、塗工装置１に到達する。塗工装置１は、走行している集電体１７に、塗工材料である電極活物質層用塗工組成物を間欠塗工し、電極活物質層が存在する塗工部２４と、非塗工部２５とを所定のパターン状に形成する。   A coating process consists of a process as shown, for example in FIG. The current collector 17 is drawn out from the electrode plate supply roll 19, travels on the conveyance path, and reaches the coating apparatus 1. The coating apparatus 1 intermittently coats a traveling current collector 17 with a coating composition for an electrode active material layer, which is a coating material, and a coating unit 24 in which an electrode active material layer is present; The coating part 25 is formed in a predetermined pattern.

塗工された集電体１７は、さらに搬送手段により搬送され、ガイドロール２３を経由して乾燥装置１８に到達し、走行しながら高温で乾燥される。乾燥後、塗工が完了された電極板またはその中間品は、ガイドロール２３を経由して電極板巻取りロール２１に巻き取られる。通常は、得られた活物質層をさらにプレス加工し、活物質層の密度、集電体に対する密着性、均質性を向上させる。   The coated current collector 17 is further transported by the transport means, reaches the drying device 18 via the guide roll 23, and is dried at a high temperature while traveling. After drying, the coated electrode plate or an intermediate product thereof is wound around the electrode plate winding roll 21 via the guide roll 23. Usually, the obtained active material layer is further pressed to improve the density of the active material layer, the adhesion to the current collector, and the homogeneity.

電極板の集電体にはアルミ箔や銅箔が用いられているが、上記のような工程で電極板を連続製造するには、集電体をとぎれさすことなく供給する必要があり、電極板供給ロールを交換に際して、集電体がなくなる前に、次の電極板供給ロールの集電体どうしをテープで繋ぎ合わせて、集電体が連続的に供給されるようにしている。   Aluminum foil or copper foil is used for the current collector of the electrode plate, but in order to continuously produce the electrode plate in the above-described process, it is necessary to supply the current collector without interruption. When exchanging the plate supply roll, the current collectors of the next electrode plate supply roll are connected with a tape before the current collector runs out, so that the current collector is continuously supplied.

従来、集電体どうしを繋ぎ合わせるテープとしては引張強度、粘着性が強く安価なポリエステル基材のアクリル系粘着材テープが使用されてきた。上記したように電極板は電極活物質層用塗工組成物を塗布し、高温で乾燥させて製造しているが、アクリル系粘着材テープを使用した場合、乾燥ゾーンでテープ部が熱収縮し、集電体にシワを誘発することが問題となっている。また、集電体に発生したシワが原因となって集電体が切れてしまう問題もある。   Conventionally, as a tape for connecting current collectors to each other, an acrylic pressure-sensitive adhesive tape based on polyester, which has high tensile strength and adhesiveness and is inexpensive, has been used. As described above, the electrode plate is manufactured by applying the electrode active material layer coating composition and drying it at a high temperature. However, when an acrylic adhesive tape is used, the tape part is thermally contracted in the drying zone. Inducing wrinkles in the current collector is a problem. There is also a problem that the current collector is cut off due to wrinkles generated in the current collector.

本発明は上記事情に鑑みなされたものであり、引張強度、粘着性を保ちつつ熱収縮によるシワを発生させないで、連続的に集電体を製造する方法を提供することを目的とする。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for continuously producing a current collector without generating wrinkles due to thermal shrinkage while maintaining tensile strength and adhesiveness.

本発明は少なくとも、電極板供給ロールから集電体を供給する工程；
集電体に電極活物質層用塗工組成物を塗布する工程；および
塗布された電極活物質層用塗工組成物を乾燥する工程からなる電極板の製造方法において、電極板供給ロールの交換に際して、先の電極板供給ロールから供給される集電体の最終端部と、次の電極板供給ロールの集電体先端部とを、シリコーン系粘着テープを使用して繋ぎ合わせて集電体を連続的に供給することを特徴とする、電極板の製造方法に関する。 The present invention includes at least a step of supplying a current collector from an electrode plate supply roll;
In the method for producing an electrode plate, comprising: applying the electrode active material layer coating composition to the current collector; and drying the applied electrode active material layer coating composition; At this time, the current collector supplied from the previous electrode plate supply roll and the current collector front end of the next electrode plate supply roll are joined together using a silicone-based adhesive tape to collect the current collector. In particular, the present invention relates to a method for manufacturing an electrode plate.

電極板供給ロールから供給される集電体は、正極板の集電体としては、例えば、非水電解液二次電池用電極板であれば、通常、アルミニウム箔が好ましく用いられる。負極板の集電休としては、例えば、非水電解液二次電池用の電極板であれば、電解銅箔や圧延銅箔等の銅箔が好ましく用いられる。集電体の厚さは、例えば、非水電解液二次電池用電極板であれば、通常５〜５０μｍ程度である。   As the current collector supplied from the electrode plate supply roll, as the current collector of the positive electrode plate, for example, an aluminum foil is preferably used as long as it is an electrode plate for a non-aqueous electrolyte secondary battery. As the current collection holiday of the negative electrode plate, for example, an electrode plate for a non-aqueous electrolyte secondary battery is preferably a copper foil such as an electrolytic copper foil or a rolled copper foil. For example, the thickness of the current collector is usually about 5 to 50 μm in the case of an electrode plate for a non-aqueous electrolyte secondary battery.

集電体に塗布される電極活物質層用塗工組成物は、少なくとも活物質、結着材および溶剤を含有する。   The electrode active material layer coating composition applied to the current collector contains at least an active material, a binder, and a solvent.

正極活物質としては、例えば、従来から非水電解液二次電池の正極活物質として用いられている材料、例えば、ＬｉＭｎ２Ｏ４（マンガン酸リチウム）、ＬｉＣｏＯ２（コバルト酸リチウム）若しくはＬｉＮｉＯ２（ニッケル酸リチウム）等のリチウム酸化物、またはＴｉＳ２、ＭｎＯ２、ＭｏＯ３もしくはＶ２Ｏ５等のカルコゲン化合物等がある。特に、ＬｉＣｏＯ２を正極活物質として用い、炭素質材料を負極活物質として用いることにより、４ボルト程度の高い放電電圧を有するリチウム系二次電池が得られる。 As the positive electrode active material, for example, a material conventionally used as a positive electrode active material of a nonaqueous electrolyte secondary battery, for example, LiMn 2 O 4 (lithium manganate), LiCoO 2 (lithium cobaltate) or LiNiO 2 There are lithium oxides such as (lithium nickelate) or chalcogen compounds such as TiS 2 , MnO 2 , MoO 3, or V 2 O 5 . In particular, by using LiCoO 2 as a positive electrode active material and a carbonaceous material as a negative electrode active material, a lithium secondary battery having a high discharge voltage of about 4 volts can be obtained.

正極活物質は、塗工層中に均一分散させるために、１〜１００μｍの範囲の粒径を有し、且つ平均粒径が３〜３０μｍの粉体であるものが好ましく使用される。これらの正極活物質は単独、あるいは２種以上を組み合わせて用いられる。   The positive electrode active material is preferably a powder having a particle size in the range of 1 to 100 μm and an average particle size of 3 to 30 μm for uniform dispersion in the coating layer. These positive electrode active materials are used alone or in combination of two or more.

負極活物質としては、例えば、従来から非水電解液二次電池の負極活物質として用いられている材料、例えば、天然グラファイト、人造グラファイト、アモルファス炭素、カーボンブラック、または、これらの成分に異種元素を添加したもののような炭素質材料が好んで用いられる。溶媒が有機系の場合には金属リチウムまたはリチウム合金のようなリチウム含有金属が好適に用いられる。   As the negative electrode active material, for example, a material conventionally used as a negative electrode active material of a nonaqueous electrolyte secondary battery, for example, natural graphite, artificial graphite, amorphous carbon, carbon black, or a different element in these components Carbonaceous materials such as those with added are preferably used. When the solvent is organic, a lithium-containing metal such as lithium metal or a lithium alloy is preferably used.

負極活物質の粒子形状は、例えば鱗片状、塊状、繊維状、球状のものが使用されている。負極活物質は、塗工層中に均一に分散させるために、１〜１００μｍの範囲の粒径を有し、且つ平均粒径が３〜３０μｍの粉体であるものが好ましく使用される。これらの負極活物質単独、あるいは２種以上を組み合わせて用いられる。   As the particle shape of the negative electrode active material, for example, a scaly shape, a lump shape, a fiber shape, or a spherical shape is used. The negative electrode active material is preferably a powder having a particle size in the range of 1 to 100 μm and an average particle size of 3 to 30 μm in order to uniformly disperse it in the coating layer. These negative electrode active materials can be used alone or in combination of two or more.

塗工組成物中の正極又は負極活物質の配合割合は、溶剤を除く配合成分を基準（固形分基準）としたときに、高い電池容量の実現とサイクル特性とのバランスとの点から９０〜９８．５重量％、好ましくは９６〜９８．５重量％とされている。   The blending ratio of the positive electrode or negative electrode active material in the coating composition is 90 to 90% from the viewpoint of realizing a high battery capacity and a balance with cycle characteristics when the blending component excluding the solvent is used as a standard (solid content standard). It is 98.5% by weight, preferably 96 to 98.5% by weight.

結着材は、従来から用いられているもの、例えば、非水電解液二次電池用電極板であれば、熱可塑性樹脂、より具体的にはポリエステル樹脂、ポリアミド樹脂、ポリアクリル酸エステル樹脂、ポリカーボネート樹脂、ポリウレタン樹脂、セルロース樹脂、ポリオレフィン樹脂、ポリビニル樹脂、フッ素系樹脂又はポリイミド樹脂等が使用される。この際、反応性官能基を導入したアクリレートモノマー又はオリゴマーを結着材中に混入させてもよい。そのほかにも、ゴム系の樹脂や、アクリル樹脂、ウレタン樹脂等の熱硬化性樹脂、アクリレートモノマー、アクリレートオリゴマー或いはそれらの混合物からなる電離放射線硬化性樹脂、上記各種の混合物が使用されることもある。   If the binder is conventionally used, for example, an electrode plate for a nonaqueous electrolyte secondary battery, a thermoplastic resin, more specifically, a polyester resin, a polyamide resin, a polyacrylate resin, A polycarbonate resin, a polyurethane resin, a cellulose resin, a polyolefin resin, a polyvinyl resin, a fluorine resin, a polyimide resin, or the like is used. At this time, an acrylate monomer or oligomer into which a reactive functional group is introduced may be mixed in the binder. In addition, thermosetting resins such as rubber resins, acrylic resins and urethane resins, ionizing radiation curable resins composed of acrylate monomers, acrylate oligomers or mixtures thereof, and various mixtures described above may be used. .

活物質層塗工組成物の結着材の配合割合は、例えば、通常の非水電解液二次電池用電極板であれば、固形分基準で０．５〜１０重量％程度である。   The blending ratio of the binder of the active material layer coating composition is, for example, about 0.5 to 10% by weight based on the solid content in the case of a normal electrode plate for a non-aqueous electrolyte secondary battery.

活物質層用塗工組成物は、少なくとも上記正又は負極活物質、結着材以外に、通常は導電剤含有する。   The active material layer coating composition usually contains a conductive agent in addition to at least the positive or negative electrode active material and the binder.

導電材としては、例えば、非水電解液二次電池用電極板であれば、グラファイト、カーボンブラック又はアセチレンブラック等の炭素質材料が必要に応じて用いられている。塗工組成物中の導電材の配合割合は、例えば、非水電解液二次電池用電極板であれば、通常、固形分基準で、１．４〜２．５重量％である。   As the conductive material, for example, in the case of an electrode plate for a non-aqueous electrolyte secondary battery, a carbonaceous material such as graphite, carbon black, or acetylene black is used as necessary. For example, in the case of an electrode plate for a non-aqueous electrolyte secondary battery, the blending ratio of the conductive material in the coating composition is usually 1.4 to 2.5% by weight based on the solid content.

活物質塗工組成物を調製する溶剤としては、トルエン、メチルエチルケトン、Ｎ−メチル−２−ピロリドン或いはこれらの混合物等の有機溶剤、あるいは水を用いることができる。塗工組成物中の溶剤は、通常は固形分が組成物全体に対して４０〜８５重量％、好ましくは５０〜８０、より好ましくは６０〜８０重量％となるように配合し、塗工液はスラリー状である。   As a solvent for preparing the active material coating composition, an organic solvent such as toluene, methyl ethyl ketone, N-methyl-2-pyrrolidone or a mixture thereof, or water can be used. The solvent in the coating composition is usually blended so that the solid content is 40 to 85% by weight, preferably 50 to 80, more preferably 60 to 80% by weight, based on the entire composition, Is in the form of a slurry.

負極用塗工組成物を調整する場合は、特に、溶剤として水を用いると共に、水中でコロイド状分散可能なゴム系結着材を選択することにより、水性エマルジョン塗工液が調製されることもある。水を用いる場合には、不純物の影響を防ぐために通常はイオン交換水が用いられる。   When preparing a coating composition for a negative electrode, an aqueous emulsion coating solution may be prepared by selecting a rubber-based binder that can be colloidally dispersed in water while using water as a solvent. is there. When water is used, ion exchange water is usually used to prevent the influence of impurities.

活物質塗工組成物は、少なくとも適宜選択した活物質及び結着材、さらに通常は適宜選択した導電材、及び他の配合成分を適切な溶剤を混合し、ホモジナイザー、ボールミル、サンドミル、ロールミルまたはプラネタリミキサー等の分散機により混合分散して、スラリー状に調製される。   The active material coating composition is prepared by mixing at least an appropriately selected active material and a binder, usually an appropriately selected conductive material, and other compounding ingredients with an appropriate solvent, and then homogenizer, ball mill, sand mill, roll mill or planetary. It is mixed and dispersed by a dispersing machine such as a mixer to prepare a slurry.

活物質層用塗工組成物の塗布方法は、特に限定されないが、例えばスライドダイコート、コンマダイレクトコート、コンマリバースコート等のように、厚い塗工層を形成できる方法が適している。ただし、活物質層に求められる厚さが比較的薄い場合には、グラビアコートやグラビアリバースコート等により塗布される。活物質層は、複数回塗布、乾燥を繰り返すことにより形成してもよい。   The method for applying the coating composition for the active material layer is not particularly limited, but a method capable of forming a thick coating layer such as a slide die coat, a comma direct coat, a comma reverse coat and the like is suitable. However, when the thickness required for the active material layer is relatively thin, it is applied by gravure coating or gravure reverse coating. The active material layer may be formed by repeating application and drying a plurality of times.

乾燥工程における熱源としては、熱風、赤外線、遠赤外線、マイクロ波、高周波、或いはそれらを組み合わせて利用できる。乾燥工程において集電体をサポートする金属ローラーや金属シートを加熱して放出させた熱によって乾燥してもよい。また、乾燥後、電子線または放射線を照射することにより結着材を架橋反応させて活物質層を得るようにしてもよい。塗布と乾燥は、複数回繰り返してもよい。   As a heat source in the drying process, hot air, infrared rays, far infrared rays, microwaves, high frequencies, or a combination thereof can be used. You may dry with the heat which discharge | released the metal roller and metal sheet which support a collector in a drying process. In addition, after drying, an active material layer may be obtained by irradiating an electron beam or radiation to cause a crosslinking reaction of the binder. Application and drying may be repeated a plurality of times.

更に、得られた活物質層をプレス加工することにより、活物質層の密度、集電体に対する密着性、均質性を向上させてもよい。   Furthermore, you may improve the density of an active material layer, the adhesiveness with respect to an electrical power collector, and homogeneity by pressing the obtained active material layer.

以上、少なくとも、電極板供給ロールから集電体を供給する工程、集電体に電極活物質層用塗工組成物を塗布する工程；および塗布された電極活物質層用塗工組成物を乾燥する工程を経て電極板が製造されるが、電極板供給ロールの集電体がなくなると、電極板今日ロールを交換する必要がある。電極板を連続的に製造するためには、先の電極板供給ロールから供給される集電体の最終端部と、次の電極板供給ロールの集電体先端部とを、テープを使用して繋ぎ合わせる必要がある。本発明においては、係るテープとしてシリコーン系粘着テープが使用される。シリコーン系粘着テープは、テープ支持体上の粘着材層に、シリコーン系粘着剤が使用されているものである。シリコーン系粘着剤は、一般にはベースポリマーとしてシリコーンゴムと、軟化剤としてのシリコーンレジンのブレンド物であり、種々の粘度、種々の粘着力を付与して使用可能であるが、粘着テープとして下記特性を有するものとして構成できるのであれば特に限定されず、公知の物を使用可能である。   As described above, at least the step of supplying the current collector from the electrode plate supply roll, the step of applying the electrode active material layer coating composition to the current collector; and drying the applied electrode active material layer coating composition The electrode plate is manufactured through the process of performing, but when the current collector of the electrode plate supply roll runs out, it is necessary to replace the electrode plate roll today. In order to continuously manufacture the electrode plate, a tape is used to connect the final end of the current collector supplied from the previous electrode plate supply roll and the current collector tip of the next electrode plate supply roll. Need to be connected together. In the present invention, a silicone adhesive tape is used as the tape. The silicone-based adhesive tape is one in which a silicone-based adhesive is used for the adhesive material layer on the tape support. A silicone adhesive is generally a blend of silicone rubber as a base polymer and silicone resin as a softening agent and can be used with various viscosities and various adhesive strengths. If it can comprise as what has this, it will not specifically limit, A well-known thing can be used.

電極板製造工程における乾燥工程は、３００〜１００℃程度の環境であるので、シリコーン系粘着テープの支持体としては、その程度の温度で熱収縮、変形、引張強度の低下が生じないもの、例えばポリエステル、ポリイミド、好ましくはポリエステルで構成されているものを使用する。支持体としての厚さは、０．０３〜０．０７ｍｍ程度がよい。その厚さが厚すぎるとダイヘッドとバックロール間のギャップを通過できずに切れてしまう等の問題が生じ、薄すぎるとテープの引張強度が弱く切れてしまう等の問題が生じる。   Since the drying process in the electrode plate manufacturing process is an environment of about 300 to 100 ° C., the support for the silicone pressure-sensitive adhesive tape does not cause thermal shrinkage, deformation, or decrease in tensile strength at that temperature, for example, Polyester, polyimide, preferably made of polyester is used. The thickness of the support is preferably about 0.03 to 0.07 mm. If the thickness is too thick, there is a problem that the tape cannot be passed through the gap between the die head and the back roll, and if the thickness is too thin, the tensile strength of the tape is weak.

シリコーン系粘着テープとしては、粘着層の厚さが０．０１０〜０．０４０ｍｍ、好ましくは０．０１５〜０．０３０ｍｍ、粘着力が１〜９Ｎ／１０ｍｍ、好ましくは２〜８Ｎ／１０ｍｍ、引張強さが３０〜１２０Ｎ／１０ｍｍ、好ましくは４０〜１１０Ｎ／１０ｍｍ、伸びが６０〜１６０％、好ましくは７０〜１５０％を有するものを使用するようにする。   The silicone adhesive tape has an adhesive layer thickness of 0.010 to 0.040 mm, preferably 0.015 to 0.030 mm, an adhesive strength of 1 to 9 N / 10 mm, preferably 2 to 8 N / 10 mm, and tensile strength. The thickness is 30 to 120 N / 10 mm, preferably 40 to 110 N / 10 mm, and the elongation is 60 to 160%, preferably 70 to 150%.

シリコーン系粘着テープを使用することにより、テープとしての引張強度、粘着性を保ったまま熱収縮によるシワを発生させずに連続的に集電体を製造することが可能となる。シリコーン系粘着テープの使用は、集電体がアルミ箔の場合に特に有効である。   By using the silicone adhesive tape, it is possible to continuously produce a current collector without generating wrinkles due to heat shrinkage while maintaining the tensile strength and adhesiveness of the tape. The use of the silicone-based adhesive tape is particularly effective when the current collector is an aluminum foil.

集電体と集電体との繋ぎ合わせ方は特に限定されないが、例えば、集電体の幅が６０ｃｍの場合は、テープ幅５ｃｍ程度のシリコーン系粘着テープを、集電体と集電体との繋ぎ目を中央にして、集電体の全幅方向に渡って貼り合わせればよい。   The method for connecting the current collector and the current collector is not particularly limited. For example, when the current collector has a width of 60 cm, a silicone-based adhesive tape having a tape width of about 5 cm is used as the current collector and the current collector. It is only necessary to bond the joints across the entire width direction of the current collector, with the joints at the center.

表１に本実施例で使用した粘着テープの支持体、粘着材、テープ特性を示した。

Figure 2006172807
Table 1 shows the support, the adhesive material, and the tape characteristics of the adhesive tape used in this example.
Figure 2006172807

実施例１
厚さ１５μｍ、幅５ｃｍのアルミ箔同士を表裏から表１中に示したテープで貼り合わせた（「貼り合わせサンプルＡ，Ｂ，ＣまたはＤ」という）。これを１５０℃雰囲気下に６分間または３時間置いてテープ熱収縮によるシワの有無を観察した。結果を下記表２に示した。 Example 1
Aluminum foils having a thickness of 15 μm and a width of 5 cm were bonded together from the front and back with the tape shown in Table 1 (referred to as “bonded sample A, B, C or D”). This was placed in a 150 ° C. atmosphere for 6 minutes or 3 hours, and the presence or absence of wrinkles due to tape heat shrinkage was observed. The results are shown in Table 2 below.

Figure 2006172807
Figure 2006172807

アクリル系粘着テープＡ、Ｂ、Ｃは、シワが発生した。シリコーン系粘着テープＤはシワが発生していなかった。   The acrylic adhesive tapes A, B, and C were wrinkled. The silicone adhesive tape D was not wrinkled.

実施例２
実施例１に引き続いて、貼り合わせサンプルを引張り試験に供した。結果を図１に示した。なお、引張試験は、強度測定用Tensile Strength測定装置によって行なった。テープつなぎ部が中央になるようにセットし、１ｍｍ／ｍｉｎで引き下げた。図１には測定された最大荷重値の３回の平均値がグラフに表されている。 Example 2
Subsequent to Example 1, the bonded sample was subjected to a tensile test. The results are shown in FIG. The tensile test was performed with a Tensile Strength measuring device for strength measurement. It was set so that the tape joint was in the center and pulled down at 1 mm / min. In FIG. 1, the average value of three times of the measured maximum load values is shown in a graph.

全ての貼り合わせサンプルは、テープ部およびテープエッジでは切れずにアルミ箔部で切れた。従ってアルミ箔をつなぎ合わせ、１５０℃で加熱した時には、貼り合わせサンプルＤのシリコーン系粘着テープは、アクリル系粘着材テープと同等の引張強度があると認められる。   All the bonded samples were cut at the aluminum foil portion without being cut at the tape portion and the tape edge. Therefore, when the aluminum foils are joined and heated at 150 ° C., it is recognized that the silicone-based adhesive tape of the bonded sample D has the same tensile strength as the acrylic adhesive tape.

実施例３
ポリエステルを支持体とするシリコーン系粘着テープ（商品名：ポリエステル粘着テープＮｏ．３３６：日東電工（株）製）で幅６００ｍｍにわたって表裏から貼り合わせることでアルミ箔どうしを繋ぎ合わせた（「貼り合わせサンプルＥ」という）。この貼り合わせサンプルＥを最高温度２７０℃となる４５ｍの乾燥フード内を、大きさ１０ｋｇから２０ｋｇの引張力をかけながら２０ｍ／ｍｉｎの速度で２回通過させた。 Example 3
Aluminum foils were joined together by bonding them from the front and back over a width of 600 mm with a silicone-based adhesive tape (trade name: Polyester adhesive tape No. 336: manufactured by Nitto Denko Corporation) using polyester as a support ("bonded sample" E "). This bonded sample E was passed twice through a 45 m dry hood having a maximum temperature of 270 ° C. at a speed of 20 m / min while applying a tensile force of 10 kg to 20 kg in size.

アルミ箔は、貼り合わせテープ部で切れることなく、またテープ部の熱収縮によるシワも発生していなかった。上記サイクルを１００回繰り返したが、アルミ箔がつなぎ部などからやぶれることは１度もなかった。   The aluminum foil was not cut at the bonded tape portion, and wrinkles due to heat shrinkage of the tape portion were not generated. The above cycle was repeated 100 times, but the aluminum foil never frayed from the joint or the like.

実施例４
ポリエステルを支持体とするシリコーン系粘着テープ（商品名：ポリエステル粘着テープＮｏ．３３６：日東電工（株）製）で幅６００ｍｍにわたって表裏から貼り合わせることで、銅箔どうしを繋ぎ合わせた（「貼り合わせサンプルＦ」という）。この貼り合わせサンプルＦを最高温度２７０℃となる４５ｍの乾燥フード内を、大きさ１０ｋｇから２０ｋｇの引張力をかけながら）２０ｍ／ｍｉｎの速度で２回通過させた。 Example 4
Copper foils were joined together by bonding them from the front and back over a width of 600 mm with a silicone-based adhesive tape (trade name: Polyester adhesive tape No. 336: manufactured by Nitto Denko Corporation) using polyester as a support ("Lamination Sample F)). This bonded sample F was passed twice through a 45 m dry hood having a maximum temperature of 270 ° C. at a speed of 20 m / min (while applying a tensile force of 10 kg to 20 kg in size).

銅箔は、貼り合わせテープ部で切れることなく、またテープ部の熱収縮によるシワも発生していなかった。上記サイクルを１００回繰り返したが、銅箔がつなぎ部などからやぶれることは１度もなかった。   The copper foil was not cut at the bonded tape part, and wrinkles due to heat shrinkage of the tape part were not generated. The above cycle was repeated 100 times, but the copper foil never frayed from the joint or the like.

貼り合わせサンプルの引張り試験における最大荷重を示すグラフ。The graph which shows the maximum load in the tension test of a bonded sample. 電極板の製造工程を説明するための図。The figure for demonstrating the manufacturing process of an electrode plate.

符号の説明Explanation of symbols

１ ：塗工装置
１７：集電体
１８：乾燥装置
１９：供給ロール
２１：電極板巻取りロール
２３：ガイドロール
２４：塗工部
２５：非塗工部

DESCRIPTION OF SYMBOLS 1: Coating apparatus 17: Current collector 18: Drying apparatus 19: Supply roll 21: Electrode plate winding roll 23: Guide roll 24: Coating part 25: Non-coating part

Claims (2)

少なくとも、電極板供給ロールから集電体を供給する工程；
集電体に電極活物質層用塗工組成物を塗布する工程；および
塗布された電極活物質層用塗工組成物を乾燥する工程からなる電極板の製造方法において、電極板供給ロールの交換に際して、先の電極板供給ロールから供給される集電体の最終端部と、次の電極板供給ロールの集電体先端部とを、シリコーン系粘着テープを使用して繋ぎ合わせて集電体を連続的に供給することを特徴とする、電極板の製造方法。 Supplying at least a current collector from an electrode plate supply roll;
In the method for producing an electrode plate, comprising: applying the electrode active material layer coating composition to the current collector; and drying the applied electrode active material layer coating composition; At this time, the current collector supplied from the previous electrode plate supply roll and the current collector front end of the next electrode plate supply roll are joined together using a silicone-based adhesive tape to collect the current collector. Is continuously supplied, and a method for producing an electrode plate. シリコーン系粘着テープが、ポリエステル支持体で構成される、請求項１に記載の電極板の製造方法。


The manufacturing method of the electrode plate of Claim 1 with which a silicone type adhesive tape is comprised with a polyester support body.


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