JP5875487B2 - Manufacturing method and manufacturing apparatus for lithium ion secondary battery - Google Patents

Manufacturing method and manufacturing apparatus for lithium ion secondary battery Download PDF

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JP5875487B2
JP5875487B2 JP2012188650A JP2012188650A JP5875487B2 JP 5875487 B2 JP5875487 B2 JP 5875487B2 JP 2012188650 A JP2012188650 A JP 2012188650A JP 2012188650 A JP2012188650 A JP 2012188650A JP 5875487 B2 JP5875487 B2 JP 5875487B2
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洋一 ▲高▼原
洋一 ▲高▼原
正志 西亀
正志 西亀
千恵美 窪田
千恵美 窪田
菊池　廣
廣 菊池
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Hitachi Ltd
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    • H01M4/36—Selection of substances as active materials, active masses, active liquids
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    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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Description

本発明は、リチウムイオン二次電池の製造方法及びその装置に関し、特に正極、負極および、正極と負極を電気的に分離するセパレータとを備えるリチウムイオン二次電池の製造方法及び製造装置に関する。   The present invention relates to a method and apparatus for manufacturing a lithium ion secondary battery, and more particularly, to a method and apparatus for manufacturing a lithium ion secondary battery including a positive electrode, a negative electrode, and a separator that electrically separates the positive electrode and the negative electrode.

携帯電子機器の発達に伴い、これらの携帯電子機器の電力供給源として、繰り返し充電が可能な小型二次電池が使用されている。中でも、エネルギー密度が高く、サイクルライフが長いとともに、自己放電性が低く、かつ、作動電圧が高いリチウムイオン二次電池が注目されている。リチウムイオン二次電池は、上述した利点を有するため、デジタルカメラ、ノート型パーソナルコンピュータ、携帯電話機などの携帯電子機器に多用されている。さらに、近年では、電気自動車用電池や電力貯蔵用電池として、高容量、高出力、かつ、高エネルギー密度を実現できる大型のリチウムイオン二次電池の研究開発が進められている。特に、自動車産業においては、環境問題に対応するため、動力源としてモータを使用する電気自動車や、動力源としてエンジン（内燃機関）とモータとの両方を使用するハイブリッド車の開発が進められている。このような電気自動車やハイブリッド車の電源としてもリチウムイオン二次電池が注目されている。ただし、リチウムイオン二次電池は、作動電圧が高く、エネルギー密度が高いがゆえに、内部短絡や外部短絡などによる異常発熱に対する十分な対策が必要とされている。   With the development of portable electronic devices, small secondary batteries that can be repeatedly charged are used as power supply sources for these portable electronic devices. Among these, lithium ion secondary batteries that have high energy density, long cycle life, low self-discharge property, and high operating voltage are attracting attention. Lithium ion secondary batteries have the advantages described above, and are therefore widely used in portable electronic devices such as digital cameras, notebook personal computers, and mobile phones. Furthermore, in recent years, research and development of large-sized lithium ion secondary batteries capable of realizing high capacity, high output, and high energy density as electric vehicle batteries and power storage batteries have been promoted. In particular, in the automobile industry, in order to cope with environmental problems, development of an electric vehicle that uses a motor as a power source and a hybrid vehicle that uses both an engine (internal combustion engine) and a motor as a power source are in progress. . Lithium ion secondary batteries have attracted attention as power sources for such electric vehicles and hybrid vehicles. However, since the lithium ion secondary battery has a high operating voltage and high energy density, sufficient countermeasures against abnormal heat generation due to an internal short circuit or an external short circuit are required.

リチウムイオン二次電池は、図８にその動作原理を示すように、非水電解質二次電池の一種で、電解質中のリチウムイオンが電気伝導を担う二次電池である。正極材料(活物質)にはリチウム金属酸化物を用い、負極材料(活物質)にはグラファイトなどの炭素材を用い、電解質には炭酸エチレンなどの有機溶媒＋ヘキサフルオロリン酸リチウム(LiPF6)といったリチウム塩を用いるのが主流となっている。電池内では充電時にリチウムイオンは正極から出て負極に入り、放電時には逆にリチウムイオンは負極から出て正極に入る。
リチウムイオン二次電池の構造は、例えば、正極材料を塗工した正極板と、負極材料を塗工した負極板と、正極板と負極板の接触を防止するポリマフィルムなどのセパレータとを捲回した電極捲回体を備えている。そして、リチウムイオン二次電池では、この電極捲回体が外装缶に挿入されるとともに、外装缶内に電解液が注入されている。つまり、リチウムイオン二次電池では、金属箔に正極材料を塗工した正極板と、金属箔に負極材料を塗工した負極板とが帯状に形成され、帯状に形成された正極板と負極板が直接接触しないように、セパレータを介して断面渦巻状に捲回されて電極捲回体が形成される。 The lithium ion secondary battery is a kind of non-aqueous electrolyte secondary battery, as shown in FIG. 8 showing its operating principle, and is a secondary battery in which lithium ions in the electrolyte are responsible for electrical conduction. Lithium metal oxide is used for the positive electrode material (active material), carbon material such as graphite is used for the negative electrode material (active material), and an organic solvent such as ethylene carbonate + lithium hexafluorophosphate (LiPF 6 ) is used for the electrolyte. It is the mainstream to use lithium salt. In the battery, lithium ions exit from the positive electrode and enter the negative electrode during charging, and conversely during discharge, lithium ions exit from the negative electrode and enter the positive electrode.
The structure of the lithium ion secondary battery includes, for example, a positive electrode plate coated with a positive electrode material, a negative electrode plate coated with a negative electrode material, and a separator such as a polymer film that prevents contact between the positive electrode plate and the negative electrode plate. The electrode winding body is provided. In the lithium ion secondary battery, the electrode winding body is inserted into the outer can and the electrolyte is injected into the outer can. That is, in a lithium ion secondary battery, a positive electrode plate coated with a positive electrode material on a metal foil and a negative electrode plate coated with a negative electrode material on a metal foil are formed in a band shape, and the positive electrode plate and the negative electrode plate formed in a band shape The electrode winding body is formed by winding in a spiral shape through the separator so that the electrode does not directly contact.

特開２００３−０４５４９１号公報（特許文献１）は、正極電極フィルム、負極電極フィルムを個別に形成して、負極電極フィルムにセパレータフィルムを貼り合わせて、該セパレータ付き負極電極フィルムに前記正極電極フィルムを積層して電極捲回体を形成する従来の電極製造方法では工程数が多い点、及び前記電極捲回体を複数枚積層した集電体内に溶液状の電解物質を均一に注入することは非常に困難で不良品の発生が多い点を改善する技術を開示している。
特開２００３−０４５４９１号公報（特許文献１）は、正極シート状物の両面に正極電極物質含有溶液と、電解、絶縁物質含有溶液とを、溶液吐出用スリットを有するダイコータを使用して塗布して、加熱工程を経て正極電極シート状物を形成し、同様に、負極シート状物の両面に負極電極物質含有溶液と、電解、絶縁物質含有溶液とを、ダイコータを使用して塗布して、加熱工程を経て負極電極シート状物を形成し、両電極シート状物を積層して電極捲回体を形成する二次電池製造方法および二次電池製造装置を開示している。 Japanese Patent Application Laid-Open No. 2003-054991 (Patent Document 1) separately forms a positive electrode film and a negative electrode film, a separator film is bonded to the negative electrode film, and the positive electrode film is applied to the negative electrode film with a separator. In the conventional electrode manufacturing method in which the electrode winding body is formed by laminating the electrode, the number of processes is large, and the solution-like electrolytic substance is uniformly injected into the current collector in which a plurality of the electrode winding bodies are stacked. A technique for improving the point that is very difficult and many defective products are generated is disclosed.
Japanese Patent Application Laid-Open No. 2003-054991 (Patent Document 1) applies a positive electrode substance-containing solution and an electrolytic and insulating substance-containing solution to both surfaces of a positive electrode sheet using a die coater having a solution discharge slit. Then, a positive electrode sheet is formed through a heating step, and similarly, a negative electrode substance-containing solution and an electrolytic and insulating substance-containing solution are applied to both surfaces of the negative electrode sheet using a die coater, A secondary battery manufacturing method and a secondary battery manufacturing apparatus are disclosed in which a negative electrode sheet material is formed through a heating step, and both electrode sheet materials are laminated to form an electrode winding body.

特開２００３−０４５４９１号公報JP 2003-054991 A

リチウムイオン二次電池の電極材料の塗工において、特許文献１のようにキャリア材の面に正極や負極の電極材料を塗工した上にセパレータとなる絶縁材料を塗工することで、生産効率の向上、製造装置のコンパクト化を可能とすることができる。   In the application of the electrode material of the lithium ion secondary battery, as in Patent Document 1, the electrode material of the positive electrode or the negative electrode is applied on the surface of the carrier material, and then the insulating material that becomes the separator is applied, thereby improving the production efficiency. The manufacturing apparatus can be made more compact.

しかしながら、キャリア材の面に正極や負極の電極材料を塗工した上に連続してセパレータとなる絶縁材料をスリットダイコータで塗工した場合、電極材料層と絶縁材料層の界面に電極材料と絶縁材料の混合層ができ、セパレータとして機能する絶縁材料の層が薄くなるに従って、正極と負極の短絡が発生しやすくなり、不良の危険性が高くなる。   However, when a positive electrode or negative electrode material is applied to the carrier material surface and an insulating material that becomes a separator is applied continuously with a slit die coater, the electrode material is insulated from the electrode material layer / insulating material layer interface. As a mixed layer of materials is formed and the insulating material layer functioning as a separator becomes thinner, a short circuit between the positive electrode and the negative electrode is more likely to occur, and the risk of defects increases.

そこで、本発明は、電極材料層と絶縁材料層の界面にできる混合層を薄くすることが出来るリチウムイオン二次電池の製造方法及び製造装置を提供する。   Therefore, the present invention provides a manufacturing method and a manufacturing apparatus of a lithium ion secondary battery that can make the mixed layer formed at the interface between the electrode material layer and the insulating material layer thin.

上記課題を解決するために本発明では、正極、負極、および、正極と負極とを電気的に分離するセパレータとを備えたリチウムイオン二次電池の製造方法において、所定速度で供給された電極基板にスリットダイコータにより電極材料を塗工し、その下流で前記電極基板上の電極材料の層の上にカーテンコータにより前記セパレータとなる絶縁材料を塗工した後、乾燥炉にて両材料の層を乾燥・固着させて電極シートを製造するようにした。 In order to solve the above problems, in the present invention, in a method of manufacturing a lithium ion secondary battery including a positive electrode, a negative electrode, and a separator that electrically separates the positive electrode and the negative electrode, an electrode substrate supplied at a predetermined speed The electrode material is applied to the electrode substrate by a slit die coater, and the insulating material to be the separator is applied to the electrode material layer on the electrode substrate downstream by a curtain coater, and then the layers of both materials are applied in a drying furnace. The electrode sheet was manufactured by drying and fixing.

また、上記課題を解決するために本発明では、電極基板を所定速度で供給する電極基板送り出しロールと、電極基板を所定速度で搬送する第１、第２、第３のローラと、前記第１のローラに対向した位置より前記電極基板に電極材料を塗工するスリットダイコータと、前記スリットダイコータの下流において、前記第２のローラに対向した位置より前記電極基板上の電極材料の層の上に絶縁材料を塗工するカーテンコータと、前記カーテンコータの下流において、前記電極基板上に塗工された電極材料と絶縁材料の層を加熱して、乾燥・固着させる乾燥炉と、前記電極材料と絶縁材料が固着された前記電極基板を巻き取る巻き取りロールとを備えたことを特徴とするリチウムイオン二次電池の製造装置を構成した。 In order to solve the above problems, in the present invention, an electrode substrate feed roll that supplies an electrode substrate at a predetermined speed, first, second, and third rollers that convey the electrode substrate at a predetermined speed, and the first A slit die coater for applying an electrode material to the electrode substrate from a position facing the roller, and on the electrode material layer on the electrode substrate from a position facing the second roller downstream of the slit die coater. Curtain coater for coating an insulating material, a drying furnace for heating and drying and fixing a layer of the electrode material and the insulating material coated on the electrode substrate downstream of the curtain coater, and the electrode material An apparatus for manufacturing a lithium ion secondary battery comprising a winding roll for winding the electrode substrate to which an insulating material is fixed is provided.

本発明によれば、キャリア材の面に電極材料と絶縁材料とを重ねて塗布して同時に乾燥、固着させる電極シートの製造方法を採用する場合に、電極材料層と絶縁材料層の界面の混合層の生成を薄く抑えることが出来るので、絶縁材料が薄くなった場合でも正極と負極の短絡は少なくなり、不良の危険性が低くなる。
上記した以外の課題、構成及び効果は、以下の実施形態の説明により明らかにされる。 According to the present invention, in the case of adopting an electrode sheet manufacturing method in which an electrode material and an insulating material are applied on the surface of a carrier material and are simultaneously dried and fixed, mixing of the interface between the electrode material layer and the insulating material layer is performed. Since the generation of the layer can be suppressed thinly, even when the insulating material is thin, the short circuit between the positive electrode and the negative electrode is reduced, and the risk of defects is reduced.
Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

実施例１におけるリチウムイオン二次電池の製造工程の構成図である。1 is a configuration diagram of a manufacturing process of a lithium ion secondary battery in Example 1. FIG. 本発明の比較例におけるリチウムイオン二次電池の製造工程の構成図である。It is a block diagram of the manufacturing process of the lithium ion secondary battery in the comparative example of this invention. キャリア材の上に塗布されたスラリー状の電極材料層と絶縁材料層の界面の断面の概念図である。It is a conceptual diagram of the cross section of the interface of the slurry-like electrode material layer apply | coated on the carrier material, and an insulating material layer. 実施例１と比較例のダイコーティング方法における絶縁層膜厚と混合層膜厚との関係を表わす図である。It is a figure showing the relationship between the insulating layer film thickness and mixed layer film thickness in the die coating method of Example 1 and a comparative example. 実施例２におけるリチウムイオン二次電池の製造工程の構成図である。6 is a configuration diagram of a manufacturing process of a lithium ion secondary battery in Example 2. FIG. 実施例２と比較例のダイコーティング方法における絶縁層膜厚と混合層膜厚との関係を表わす図である。It is a figure showing the relationship between the insulating layer film thickness and mixed layer film thickness in the die coating method of Example 2 and a comparative example. (ａ)スリットダイコータによる塗布の状況を模式的に示す断面図であり、(ｂ)カーテンコータによる塗布の状況を模式的に示す断面図である。(a) It is sectional drawing which shows typically the condition of application | coating by a slit die coater, (b) It is sectional drawing which shows typically the condition of application | coating by a curtain coater. リチウムイオン二次電池の動作原理を説明する図である。It is a figure explaining the principle of operation of a lithium ion secondary battery. リチウムイオン二次電池が製造されるまでの具体的な工程を模式的に示す図である。It is a figure which shows typically the specific process until a lithium ion secondary battery is manufactured.

以下、実施例を図面を用いて説明する。
図９は、リチウムイオン二次電池が製造されるまでの具体的な工程を模式的に示す図である。図９に示すように、リチウムイオン二次電池の製造工程は、正極電極シート製造工程と負極電極シート製造工程と電池セルの組立工程と電池モジュールの組立工程とを含んでいる。 Hereinafter, examples will be described with reference to the drawings.
FIG. 9 is a diagram schematically showing specific steps until a lithium ion secondary battery is manufactured. As shown in FIG. 9, the manufacturing process of a lithium ion secondary battery includes a positive electrode sheet manufacturing process, a negative electrode sheet manufacturing process, a battery cell assembly process, and a battery module assembly process.

正極電極シート製造工程では、まず、正極材料の原料となる各種材料を混練および調合して、スラリー材料(正極材料)を作成する。そして、フィルム状の金属箔にこのスラリー材料を塗工、乾燥した後、スラリー材料が塗工された金属箔に圧縮や切断といった加工を行い、フィルム状の正極電極シートを製造する。   In the positive electrode sheet manufacturing process, first, a slurry material (positive electrode material) is prepared by kneading and preparing various materials as raw materials for the positive electrode material. And after apply | coating and drying this slurry material to a film-form metal foil, processing, such as a compression and a cutting | disconnection, is performed to the metal foil with which the slurry material was coated, and a film-form positive electrode sheet is manufactured.

一方、負極電極シート製造工程では、正極電極シート製造工程とは使用される原料となる各種材料は異なるが、負極電極シートが製造されるまでの手順は同じである。まず、負極材料の原料となる各種材料を混練および調合してスラリー材料(負極材料)を作成し（混練・調合）、フィルム状の金属箔にこのスラリー材料を塗工、乾燥した後（塗工）、スラリー材料が塗工された金属箔の圧縮や切断といった加工を行い（加工）、フィルム状の負極電極シートを製造する。   On the other hand, the negative electrode sheet manufacturing process is different from the positive electrode sheet manufacturing process in various materials used as raw materials, but the procedure until the negative electrode sheet is manufactured is the same. First, various materials that are the raw materials of the negative electrode material are kneaded and prepared to prepare a slurry material (negative electrode material) (kneading / preparation), and the slurry material is applied to a film-like metal foil and dried (coating) ), And processing such as compression or cutting of the metal foil coated with the slurry material (processing) to produce a film-like negative electrode sheet.

その後、電池セル組立工程では、捲回と呼ばれる工程で、上記のフィルム状の正極電極シートおよび負極電極シートから、電池セルに必要な大きさの正極および負極を切り出すとともに、これら正極電極シートと負極電極シートを分離するためのフィルム状のセパレータ材料から電池セルに必要な大きさのセパレータを切り出し、正極および負極に、切り出したセパレータを挟んで重ねて捲き合わせる（捲回）。そして、捲き合わせた正極、負極およびセパレータの電極対の群を組み立てて溶接する。その後、溶接したこれら電極対の群を、電解液が注入（注液）された電池缶内に配置した後、電池缶を完全に密閉し（封口）、電池セルを作成する。   Thereafter, in the battery cell assembly process, a positive electrode and a negative electrode having a size necessary for the battery cell are cut out from the film-like positive electrode sheet and negative electrode sheet in a process called winding, and the positive electrode sheet and the negative electrode are cut out. A separator having a size necessary for the battery cell is cut out from the film-like separator material for separating the electrode sheet, and the positive electrode and the negative electrode are overlapped with each other with the cut-out separator interposed therebetween (winding). Then, a group of electrode pairs of the positive electrode, the negative electrode, and the separator assembled together is assembled and welded. Thereafter, the group of welded electrode pairs is placed in a battery can into which an electrolytic solution has been injected (injected), and then the battery can is completely sealed (sealed) to form a battery cell.

電池セル検査工程は、セル組立工程にて作成されたリチウムイオン二次電池のセルを繰り返し充放電し、この電池セルの性能及び信頼性に関する検査（例えば、電池セルの容量や電圧、充電または放電時の電流や電圧等の検査）を行なう（単電池検査）。これにより、電池セルが完成し、電池セル組立工程が終了する。   The battery cell inspection step repeatedly charges and discharges the cells of the lithium ion secondary battery created in the cell assembly step, and inspects the performance and reliability of the battery cell (for example, the capacity and voltage of the battery cell, charging or discharging) (Inspection of current and voltage at the time) (single cell inspection). Thereby, a battery cell is completed and a battery cell assembly process is complete | finished.

次に、モジュール組立工程では、電池セルを複数個直列に組み合わせて電池モジュールを構成し、さらに、充／放電制御用コントローラを接続して電池システムを製造する（モジュール組立）。その後、モジュール検査工程において、モジュール組立工程において組み立てられた電池モジュールの性能及び信頼性に関する検査（例えば、電池モジュールの容量や電圧、充電または放電時の電流や電圧等の検査）を行なう（モジュール検査）。   Next, in the module assembly process, a battery module is configured by combining a plurality of battery cells in series, and a battery system is manufactured by connecting a controller for charge / discharge control (module assembly). Thereafter, in the module inspection process, an inspection regarding the performance and reliability of the battery module assembled in the module assembly process (for example, inspection of capacity and voltage of the battery module, current and voltage during charging or discharging) is performed (module inspection). ).

本発明は、前記正極電極シート製造工程、及び前記負極電極シート製造工程における塗工工程に係わる製造方法及び製造装置である。本発明の実施により、前記電池セル組立工程において、電解液を電池缶内へ注入する注液工程を省くことが可能である。   This invention is the manufacturing method and manufacturing apparatus which concern on the coating process in the said positive electrode sheet manufacturing process and the said negative electrode sheet manufacturing process. By carrying out the present invention, it is possible to omit the liquid injection step of injecting the electrolytic solution into the battery can in the battery cell assembly step.

図２に特許文献１の第２実施例に開示されている正極シート状物、または負極シート状物に電極物質、および電解、絶縁物質を連続して塗布して、乾燥・固着させる一連の製造工程の構成図を示す。特許文献１ではキャリア材(正極シート状物、または負極シート状物)の両面に電極物質、および電解、絶縁物質を塗布しているが、現実的ではないと考えられるので、本実施例の比較例として、キャリア材の片面に電極物質、および電解、絶縁物質を塗布する製造工程例を示す。   FIG. 2 shows a series of manufactures in which a positive electrode sheet or negative electrode sheet disclosed in the second embodiment of Patent Document 1 is continuously coated with an electrode material, electrolysis and an insulating material, and dried and fixed. The block diagram of a process is shown. In Patent Document 1, electrode materials, electrolysis, and insulating materials are applied to both surfaces of a carrier material (positive electrode sheet or negative electrode sheet), but it is considered impractical. As an example, an example of a manufacturing process in which an electrode material, electrolysis, and an insulating material are applied to one side of a carrier material is shown.

図２の製造工程では、正極電極シートの片面を製造している。正極板ＰＥＰは、正極板送り出しロール１ＲＬ１から送り出され、ローラ２ＲＬ２に対抗するスリットダイコータ１ＤＣ１から供給される正極材料ＰＡＳが塗工され、続いて、ローラ３ＲＬ３と対抗した位置のスリットダイコータ２ＤＣ２から供給される絶縁材料ＩＦが塗工され、乾燥炉ＤＲＹを通過することで乾燥され、巻き取りロール５ＲＬ５に巻き取られ、正極電極シートが製造される。   In the manufacturing process of FIG. 2, one side of the positive electrode sheet is manufactured. The positive electrode plate PEP is fed from the positive electrode plate feed roll 1RL1, coated with the positive electrode material PAS supplied from the slit die coater 1DC1 opposed to the roller 2RL2, and then supplied from the slit die coater 2DC2 at a position opposed to the roller 3RL3. The insulating material IF to be coated is applied, dried by passing through a drying furnace DRY, wound around a winding roll 5RL5, and a positive electrode sheet is manufactured.

前記したスリットダイコータ１ＤＣ１は、従来から厚膜塗工や、高粘度塗料を塗布する用途に広く採用されている。本比較例のダイコーティング方法では、図７(ａ)に口金７１により示す通り、図示していない正極材料(スラリー材料)ＰＡＳを貯留したタンクより図示していない定量ポンプによって、口金７１のマニホールド７３に正極材料(スラリー材料)ＰＡＳが供給される。マニホールド７３において、正極材料の圧力分布を均一にした後、口金７１に設けられたスリット７４へ正極材料(スラリー材料)ＰＡＳが供給され、吐出される。吐出された正極材料(スラリー材料)ＰＡＳは、口金７１と一定間隔ｈ１(本比較例、および本実施例において共にｈ１＝５０〜１００μｍとしている)を保って相対的に走行するキャリア材(正極シート状物)８１との間にビードと呼ばれる正極材料溜り７５を形成して、この状態でキャリア材(正極シート状物)８１の走行に伴って正極材料を引き出して塗膜を形成する。   The above-described slit die coater 1DC1 has been widely used for thick film coating and high viscosity paint applications. In the die coating method of this comparative example, as shown by a base 71 in FIG. 7A, a manifold 73 of the base 71 is provided by a metering pump (not shown) from a tank that stores a positive electrode material (slurry material) PAS (not shown). Is supplied with positive electrode material (slurry material) PAS. After the pressure distribution of the positive electrode material is made uniform in the manifold 73, the positive electrode material (slurry material) PAS is supplied to the slit 74 provided in the base 71 and discharged. The discharged positive electrode material (slurry material) PAS is a carrier material (positive electrode sheet) that travels relatively while maintaining a constant distance h1 from the base 71 (h1 = 50 to 100 μm in both the comparative example and the present example). A positive electrode material reservoir 75 called a bead is formed between the positive electrode material and the carrier material (positive electrode sheet-like material) 81 in this state to form a coating film.

ここで、塗膜形成により消費される量と同量の正極材料をスリット７４から供給することにより塗膜を連続的に形成する。蒸発速度の速い有機溶剤系の薄膜の塗布を安定的に行なうために、前記正極材料溜り７５の下流側メニスカス(液面の屈曲)７９の形状の安定化が重要となる。そのために、マニホールド７３へ正極材料を供給する圧力は、スリット部７４圧損＋口金７１の下流側リップ部７８圧損＋下流側メニスカス７９圧力となる。   Here, the coating film is continuously formed by supplying the same amount of positive electrode material as consumed by the coating film formation from the slit 74. In order to stably apply an organic solvent-based thin film having a high evaporation rate, it is important to stabilize the shape of the meniscus 79 (bending of the liquid surface) on the downstream side of the positive electrode material reservoir 75. Therefore, the pressure for supplying the positive electrode material to the manifold 73 is the slit 74 pressure loss + the downstream lip 78 pressure loss of the base 71 + the downstream meniscus 79 pressure.

図２の製造工程では、引き続き第２のスリットダイコータ２ＤＣ２により電解、絶縁物質を塗布しているが、そこでのダイコーティング方法は前記したスリットダイコータ１ＤＣ１における条件と同様である。スリットダイコータ２ＤＣ２のスリット７４から吐出された電解、絶縁物質を原料とするスラリー材料(絶縁材料ＩＦ)を、上流でキャリア材(正極シート状物)８１に正極材料が塗膜された上に塗布する。   In the manufacturing process of FIG. 2, electrolysis and an insulating material are continuously applied by the second slit die coater 2DC2, and the die coating method is the same as the conditions in the slit die coater 1DC1 described above. The slurry material (insulating material IF) discharged from the slit 74 of the slit die coater 2DC2 is applied on the carrier material (positive electrode sheet) 81 coated with the positive electrode material upstream. .

以上のように、スラリー状の正極材料と絶縁材料を重ねて塗布した後、乾燥炉ＤＲＹによる加熱・乾燥工程を経て、両方の塗膜層を同時に乾燥、固着させることが出来て効率がよい。しかし、キャリア材の上に塗布されたスラリー状の正極材料と絶縁材料は、図３に断面の概念図を示すように、電極板のキャリア材(ＥＰ)の上に塗布された電極材料層(ＥＬ)と絶縁材料層(ＳＥＬ)との界面には絶縁機能が失われた混合層(ＭＩＸ)ができることが本発明者により確認された。この混合層(ＭＩＸ)の生成により、絶縁機能を持つ絶縁材料層(ＳＥＬ)の厚さが本来意図した厚さより薄くなることが問題である。   As described above, after the slurry-like positive electrode material and the insulating material are applied in layers, both coating layers can be dried and fixed at the same time through the heating / drying process in the drying furnace DRY, which is efficient. However, the slurry-like positive electrode material and insulating material applied on the carrier material are formed of an electrode material layer (on the electrode material layer (EP) applied on the electrode plate (EP)), as shown in the conceptual diagram of FIG. It has been confirmed by the present inventors that a mixed layer (MIX) having lost its insulating function can be formed at the interface between EL) and the insulating material layer (SEL). As a result of the generation of the mixed layer (MIX), there is a problem that the thickness of the insulating material layer (SEL) having an insulating function becomes thinner than originally intended.

本実施例では、リチウムイオン二次電池のコンパクト化に伴いセパレータとなる絶縁材料層を薄く設計する場合でも、電極材料層と絶縁材料層の界面の混合層を薄くできるダイコーティング方法を説明する。   In this embodiment, a die coating method capable of thinning the mixed layer at the interface between the electrode material layer and the insulating material layer will be described even when the insulating material layer serving as a separator is designed to be thin as the lithium ion secondary battery becomes compact.

図１は、本実施例のリチウムイオン二次電池の製造方法の構成図の例である。
正極板ＰＥＰは、正極板送り出しロール１ＲＬ１から送り出され、ローラ２ＲＬ２に対抗するスリットダイコータＤＣ１から供給される正極材料ＰＡＳが塗工され、ローラ３ＲＬ３と対抗した位置のカーテンコータＣＣ１から供給される絶縁材料ＩＦが塗工され、乾燥炉ＤＲＹを通過することで乾燥され、巻き取りロール５ＲＬ５に巻き取られ、正極電極シートが製造される。本実施例は、図２に示す比較例において、スリットダイコータ２ＤＣ２から絶縁材料ＩＦを供給して塗工しているのに替えて、カーテンコータＣＣ１から絶縁材料ＩＦを供給して塗工するダイコーティング方法である。 FIG. 1 is an example of a configuration diagram of a method for manufacturing a lithium ion secondary battery of the present embodiment.
The positive electrode plate PEP is fed from the positive electrode plate feed roll 1RL1, coated with the positive electrode material PAS supplied from the slit die coater DC1 opposed to the roller 2RL2, and the insulating material supplied from the curtain coater CC1 at the position opposed to the roller 3RL3. The IF is applied, dried by passing through a drying furnace DRY, wound on a winding roll 5RL5, and a positive electrode sheet is manufactured. In this embodiment, instead of supplying the insulating material IF from the slit die coater 2DC2 for coating in the comparative example shown in FIG. 2, the coating is performed by supplying the insulating material IF from the curtain coater CC1. Is the method.

カーテンコータＣＣ１は、図７(ｂ)に口金７２により示す通り、図示していない絶縁材料(スラリー材料)ＩＦを貯留したタンクより図示していない定量ポンプによって、口金７２のマニホールド７６に絶縁材料(スラリー材料)ＩＦが供給される。マニホールド７６において、絶縁材料の圧力分布を均一にした後、口金７２に設けられたスリット７７へ絶縁材料(スラリー材料)ＩＦが供給され、吐出される。吐出された絶縁材料(スラリー材料)ＩＦは、均一な安定した流量のカーテン膜８０を形成して落下し、このカーテン膜８０は、口金７２と一定間隔ｈ２を保って相対的に走行するキャリア材(正極シート状物)８１上の正極材料ＰＡＳ層に当った瞬間にキャリア材と同速に引き伸ばされて、均一に塗工される。   As shown by a base 72 in FIG. 7B, the curtain coater CC1 is connected to the manifold 76 of the base 72 by a metering pump (not shown) from a tank storing an insulating material (slurry material) IF (not shown). Slurry material) IF is supplied. After the pressure distribution of the insulating material is made uniform in the manifold 76, the insulating material (slurry material) IF is supplied to the slit 77 provided in the base 72 and discharged. The discharged insulating material (slurry material) IF forms a curtain film 80 having a uniform and stable flow rate and falls, and this curtain film 80 is a carrier material that travels relatively with the base 72 at a constant interval h2. (Positive electrode sheet) The positive electrode material PAS layer 81 is stretched at the same speed as the carrier material at the moment of contact with the positive electrode material PAS layer, and is applied uniformly.

本実施例では、カーテンコータＣＣ１とキャリア材(正極シート状物)８１との間隔ｈ２を１００μｍ〜１０mmとしている。カーテンコータＣＣ１においても、前記したスリットダイコータ１ＤＣ１と同様に、塗膜形成により消費される量と同量の絶縁材料をスリット７７から供給することにより塗膜を連続的に形成する。そのために、マニホールド７６へ絶縁材料を供給する圧力は、スリット部７７圧損と、前記した塗膜形成により消費される量と同量の流量を確保する圧力があればよい。スリット７７より吐出された絶縁材料(スラリー材料)ＩＦは、初速Ｖ0で間隔ｈ２を落下して、 In this embodiment, the distance h2 between the curtain coater CC1 and the carrier material (positive electrode sheet) 81 is set to 100 μm to 10 mm. In the curtain coater CC1, as in the slit die coater 1DC1, the coating film is continuously formed by supplying the same amount of insulating material from the slit 77 as consumed by the coating film formation. For this purpose, the pressure for supplying the insulating material to the manifold 76 may be sufficient to ensure the pressure loss of the slit portion 77 and the flow rate equal to the amount consumed by the coating film formation. The insulating material (slurry material) IF discharged from the slit 77 drops at the initial speed V 0 at the interval h2,

Figure 0005875487
Figure 0005875487

でキャリア材に衝突するが、間隔ｈ２は前記した通り小さいので、速度Ｖcは僅かであり、キャリア材上の正極材料の塗膜と接触する圧力は、前記したスリットダイコータ１ＤＣ１の正極材料溜り７５における口金７１の下流側リップ部７８圧損＋下流側メニスカス７９圧力よりは小さくなるところが特徴である。   However, since the distance h2 is small as described above, the velocity Vc is small, and the pressure at which the positive electrode material coating on the carrier material contacts the positive electrode material reservoir 75 of the slit die coater 1DC1. It is characterized in that it is smaller than the pressure loss of the downstream lip 78 of the base 71 + the pressure of the downstream meniscus 79.

本実施例では、正極材料ＰＡＳはコバルト酸リチウムからなる活物質と導電助剤としてのカーボンを混合し、ポリフッ化ビニリデンからなる結着剤（バインダ）をＮメチルピロリドン（ＮＭＰ）に溶解させた溶液に混練したスラリーを用いた。
絶縁材料ＩＦはシリカ（ＳｉＯ２）の粉体をポリフッ化ビニリデンからなる結着剤（バインダ）をＮメチルピロリドン（ＮＭＰ）に溶解させた溶液に混練したスラリーを用いた。 In this embodiment, the positive electrode material PAS is a solution in which an active material made of lithium cobaltate and carbon as a conductive auxiliary are mixed, and a binder (binder) made of polyvinylidene fluoride is dissolved in N-methylpyrrolidone (NMP). The slurry kneaded in the above was used.
As the insulating material IF, a slurry in which silica (SiO 2 ) powder was kneaded into a solution obtained by dissolving a binder (binder) made of polyvinylidene fluoride in N-methylpyrrolidone (NMP) was used.

本実施例のダイコーティング方法における電極材料層と絶縁材料層の界面の混合層の評価は、完成した電極の断面を切り出し、ＳＥＭで観察した像から混合層の膜厚を算出した。図３に示す断面の概念図を基に、混合層ＭＩＸの膜厚を評価した結果を図４にまとめた。比較例では絶縁層の膜厚が薄くなるにしたがって混合層の膜厚が大きくなり、２５μｍ以下の絶縁層の膜厚では短絡発生の可能性が高くなることが判る。本実施例のダイコーティング方法の結果は、絶縁層の膜厚が薄くなっていっても混合層の膜厚は５μｍ以下になっており、短絡発生の可能性は低いことが判った。   Evaluation of the mixed layer at the interface between the electrode material layer and the insulating material layer in the die coating method of this example was performed by cutting out a cross section of the completed electrode and calculating the thickness of the mixed layer from an image observed with an SEM. The results of evaluating the film thickness of the mixed layer MIX based on the conceptual diagram of the cross section shown in FIG. 3 are summarized in FIG. In the comparative example, it can be seen that the thickness of the mixed layer increases as the thickness of the insulating layer decreases, and the possibility of occurrence of a short circuit increases at the thickness of the insulating layer of 25 μm or less. As a result of the die coating method of this example, it was found that even if the thickness of the insulating layer was thin, the thickness of the mixed layer was 5 μm or less, and the possibility of occurrence of a short circuit was low.

実施例２では、電極材料層と絶縁材料層の界面が均一となり、セパレータ材料がさらに薄くなった場合でも短絡発生の危険性が低くなるダイコーティング方法の例を説明する。   In Example 2, an example of a die coating method will be described in which the interface between the electrode material layer and the insulating material layer is uniform, and the risk of occurrence of a short circuit is reduced even when the separator material is further thinned.

図５は、本実施例のリチウムイオン二次電池の製造方法の構成図の例である。
正極板ＰＥＰは、正極板送り出しロールＲＬ１から送り出され、ローラ２ＲＬ２に対抗するスリットダイコータＤＣ１から供給される正極材料ＰＡＳが塗工され、ローラ３ＲＬ３と対抗した位置のカーテンコータＣＣ１から供給される絶縁材料ＩＦが塗工され、ローラ６ＲＬ６に対抗するナイフコータＫＣ１により塗工膜高さが調整され、乾燥炉ＤＲＹを通過することで乾燥され、巻き取りロール５ＲＬ５に巻き取られ、正極電極シートが製造される。 FIG. 5 is an example of a configuration diagram of a method for manufacturing the lithium ion secondary battery of the present embodiment.
The positive electrode plate PEP is fed from the positive electrode plate feed roll RL1, coated with the positive electrode material PAS supplied from the slit die coater DC1 opposed to the roller 2RL2, and the insulating material supplied from the curtain coater CC1 at the position opposed to the roller 3RL3. The IF is coated, the coating film height is adjusted by the knife coater KC1 that opposes the roller 6RL6, dried by passing through the drying furnace DRY, wound on the winding roll 5RL5, and the positive electrode sheet is manufactured. .

正極材料ＰＡＳはコバルト酸リチウムからなる活物質と導電助剤としてのカーボンを混合し、ポリフッ化ビニリデンからなる結着剤（バインダ）をＮメチルピロリドン（ＮＭＰ）に溶解させた溶液に混練したスラリーを用いた。
絶縁材料ＩＦはシリカ（ＳｉＯ２）の粉体をポリフッ化ビニリデンからなる結着剤（バインダ）をＮメチルピロリドン（ＮＭＰ）に溶解させた溶液に混練したスラリーを用いた。 The positive electrode material PAS is a slurry in which an active material made of lithium cobaltate and carbon as a conductive additive are mixed and kneaded into a solution in which a binder (binder) made of polyvinylidene fluoride is dissolved in N-methylpyrrolidone (NMP). Using.
As the insulating material IF, a slurry obtained by kneading silica (SiO 2) powder into a solution obtained by dissolving a binder (binder) made of polyvinylidene fluoride in N-methylpyrrolidone (NMP) was used.

本実施例のダイコーティング方法における電極材料層と絶縁材料層の界面の混合層の評価は、完成した電極の断面を切り出し、ＳＥＭで観察した像から混合層の膜厚を算出した。図３に示す断面の概念図を基に、混合層ＭＩＸの膜厚を評価した結果を図６にまとめた。比較例では絶縁層の膜厚が薄くなるにしたがって混合層の膜厚が大きくなり、２５μｍ以下の絶縁層の膜厚では短絡発生の可能性が高くなることがわかる。本実施例のダイコーティング方法の結果は、絶縁層の膜厚がさらに薄くなっていっても混合層の膜厚は５μｍ以下になっており、短絡発生の可能性は低い。   Evaluation of the mixed layer at the interface between the electrode material layer and the insulating material layer in the die coating method of this example was performed by cutting out a cross section of the completed electrode and calculating the thickness of the mixed layer from an image observed with an SEM. The results of evaluating the film thickness of the mixed layer MIX based on the conceptual diagram of the cross section shown in FIG. 3 are summarized in FIG. In the comparative example, it can be seen that the thickness of the mixed layer increases as the thickness of the insulating layer decreases, and the possibility of occurrence of a short circuit increases at the thickness of the insulating layer of 25 μm or less. As a result of the die coating method of this example, even if the thickness of the insulating layer is further reduced, the thickness of the mixed layer is 5 μm or less, and the possibility of occurrence of a short circuit is low.

以上の実施例１，２では、正極板ＰＥＰの片面に正極材料ＰＡＳ、および絶縁材料ＩＦを塗工して、正極電極シートを製造する例を記載した。正極板ＰＥＰの両面に正極材料ＰＡＳ、および絶縁材料ＩＦを塗工する場合には、巻き取りロール５ＲＬ５に巻き取られた正極電極シートを反転させて、再度同一の工程を経て裏面を塗工することが考えられる。   In the above Examples 1 and 2, the example in which the positive electrode material PAS and the insulating material IF are coated on one surface of the positive electrode plate PEP to manufacture the positive electrode sheet has been described. When the positive electrode material PAS and the insulating material IF are coated on both surfaces of the positive electrode plate PEP, the positive electrode sheet wound around the winding roll 5RL5 is reversed, and the back surface is coated again through the same process. It is possible.

また、実施例１，２では、正極電極シート製造工程の例を示した。同様のダイコーティング方法を使用して、負極電極シート製造工程も実現できる。この場合には、負極材料ＮＡＳは炭素材料(カーボン材料)からなる負極活物質と、ポリフッ化ビニリデンからなる結着剤（バインダ）をＮメチルピロリドン（ＮＭＰ）に溶解させた溶液に混練したスラリーを用いる。
絶縁材料ＩＦはシリカ（ＳｉＯ２）の粉体をポリフッ化ビニリデンからなる結着剤（バインダ）をＮメチルピロリドン（ＮＭＰ）に溶解させた溶液に混練したスラリーを用いる。 Moreover, in Example 1, 2, the example of the positive electrode sheet manufacturing process was shown. A negative electrode sheet manufacturing process can also be realized using the same die coating method. In this case, the negative electrode material NAS is a slurry obtained by kneading a negative electrode active material made of a carbon material (carbon material) and a solution in which a binder (binder) made of polyvinylidene fluoride is dissolved in N-methylpyrrolidone (NMP). Use.
As the insulating material IF, a slurry obtained by kneading silica (SiO 2 ) powder into a solution in which a binder (binder) made of polyvinylidene fluoride is dissolved in N-methylpyrrolidone (NMP) is used.

負極電極シート製造工程では、負極板ＮＥＰに負極材料ＮＡＳと絶縁材料ＩＦとを重ねて塗布する場合と、負極板ＮＥＰに負極材料ＮＡＳのみを塗布して負極電極シートを製造する場合の両方が考えられる。   In the negative electrode sheet manufacturing process, both the case where the negative electrode material NAS and the insulating material IF are applied in layers on the negative electrode plate NEP and the case where the negative electrode material sheet is manufactured by applying only the negative electrode material NAS to the negative electrode plate NEP are considered. It is done.

なお、本発明は上記した実施例に限定されるものではなく、様々な変形例が含まれる。例えば、上記した実施例は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施例の構成の一部を他の実施例の構成に置き換えることが可能であり、また、ある実施例の構成に他の実施例の構成を加えることも可能である。また、各実施例の構成の一部について、他の構成の追加・削除・置換をすることが可能である。   In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

また、前記実施例１、２では、リチウムイオン二次電池を例に挙げて、本発明の技術的思想について説明したが、本発明の技術的思想は、リチウムイオン二次電池に限定されるものではなく、正極、負極、および、正極と負極とを電気的に分離するセパレータとを備える蓄電デバイス（例えば、電池やキャパシタなど）に幅広く適用することができる。   In the first and second embodiments, the technical idea of the present invention has been described by taking a lithium ion secondary battery as an example. However, the technical idea of the present invention is limited to a lithium ion secondary battery. Instead, it can be widely applied to an electricity storage device (for example, a battery or a capacitor) including a positive electrode, a negative electrode, and a separator that electrically separates the positive electrode and the negative electrode.

ＲＬ１ 正極板送り出しロール
ＲＬ２ ローラ２
ＲＬ３ ローラ３
ＲＬ４ ローラ４
ＲＬ５ 巻き取りロール
ＲＬ６ ローラ６
ＰＥＰ 正極板
ＤＣ１ スリットダイコータ１
ＤＣ２ スリットダイコータ２
ＰＡＳ 正極活物質
ＣＣ１ カーテンコータ
ＩＦ 絶縁材料
ＤＲＹ 乾燥炉
ＳＥＬ 絶縁層
ＥＬ 電極層
ＥＰ 電極板
ＭＩＸ 混合層
７１ スリットダイコータ口金
７２ カーテンコータ口金
７３ マニホールド
７４ スリット
７５ 電極材料溜り(ビード)
７６ マニホールド
７７ スリット
７８ 口金７１の下流側リップ部
７９ 下流側メニスカス
８０ 絶縁材料のカーテン膜
８１ キャリア材(正極シート状物)
ｈ１ スリットダイコータ口金とキャリア材との間隔
ｈ２ カーテンコータ口金とキャリア材との間隔 RL1 positive plate feed roll RL2 roller 2
RL3 roller 3
RL4 roller 4
RL5 Winding roll RL6 Roller 6
PEP Positive electrode plate DC1 Slit die coater 1
DC2 slit die coater 2
PAS Positive electrode active material CC1 Curtain coater IF Insulating material DRY Drying furnace SEL Insulating layer EL Electrode layer EP Electrode plate MIX Mixed layer 71 Slit die coater base 72 Curtain coater base 73 Manifold 74 Slit 75 Electrode material reservoir (bead)
76 Manifold 77 Slit 78 Downstream lip 79 of base 71 Downstream meniscus 80 Curtain film 81 of insulating material Carrier material (positive electrode sheet)
h1 Distance between slit die coater base and carrier material h2 Distance between curtain coater base and carrier material

Claims (8)

正極、負極、および、正極と負極とを電気的に分離するセパレータとを備えたリチウムイオン二次電池の製造方法において、
所定速度で供給された電極基板にスリットダイコータにより電極材料を塗工し、その下流で前記電極基板上の電極材料の層の上にカーテンコータにより前記セパレータとなる絶縁材料を塗工した後、乾燥炉にて両材料の層を乾燥・固着させて電極シートを製造することを特徴とするリチウムイオン二次電池の製造方法。 In a method for producing a lithium ion secondary battery comprising a positive electrode, a negative electrode, and a separator that electrically separates the positive electrode and the negative electrode,
An electrode material is applied to the electrode substrate supplied at a predetermined speed by a slit die coater, and after that, an insulating material to be the separator is applied by a curtain coater on the electrode material layer on the electrode substrate, and then dried. A method for producing a lithium ion secondary battery, wherein an electrode sheet is produced by drying and fixing layers of both materials in a furnace. 前記電極材料は、正極材料はコバルト酸リチウムからなる活物質と導電助剤としてのカーボンを混合し、ポリフッ化ビニリデンからなる結着剤をＮメチルピロリドンに溶解させた溶液に混練したスラリーを用い、
負極材料は炭素材料からなる負極活物質を、ポリフッ化ビニリデンからなる結着剤をＮメチルピロリドンに溶解させた溶液に混練したスラリーを用いることを特徴とする請求項１に記載のリチウムイオン二次電池の製造方法。 As the electrode material, a positive electrode material is a slurry in which an active material composed of lithium cobaltate and carbon as a conductive additive are mixed and kneaded into a solution in which a binder composed of polyvinylidene fluoride is dissolved in N-methylpyrrolidone ,
The negative electrode active material negative electrode material made of a carbon material, a lithium ion secondary of claim 1, characterized in that use a binder made of polyvinylidene fluoride were kneaded in a solution prepared by dissolving in N-methylpyrrolidone slurry Battery manufacturing method. 前記絶縁材料は、シリカの粉体をポリフッ化ビニリデンからなる結着剤をＮメチルピロリドンに溶解させた溶液に混練したスラリーを用いることを特徴とする請求項１に記載のリチウムイオン二次電池の製造方法。 The insulating material is silica powder of the lithium-ion secondary battery according to claim 1, characterized by using a kneaded slurry solution binder was dissolved in N-methylpyrrolidone consisting of polyvinylidene fluoride Production method. 所定速度で供給された前記電極基板上の電極材料の層の上にカーテンコータにより絶縁材料を塗工した後、ナイフコータにより塗工膜高さを調整して、乾燥炉へ投入することを特徴とする請求項１に記載のリチウムイオン二次電池の製造方法。   The insulating material is coated on the electrode material layer on the electrode substrate supplied at a predetermined speed by a curtain coater, and then the coating film height is adjusted by a knife coater and put into a drying furnace. The method for producing a lithium ion secondary battery according to claim 1. 電極基板を所定速度で供給する電極基板送り出しロールと、
電極基板を所定速度で搬送する第１、第２、第３のローラと、
前記第１のローラに対向した位置より前記電極基板に電極材料を塗工するスリットダイコータと、
前記スリットダイコータの下流において、前記第２のローラに対向した位置より前記電極基板上の電極材料の層の上に絶縁材料を塗工するカーテンコータと、
前記カーテンコータの下流において、前記電極基板上に塗工された電極材料と絶縁材料の層を加熱して、乾燥・固着させる乾燥炉と、
前記電極材料と絶縁材料が固着された前記電極基板を巻き取る巻き取りロールとを備えたことを特徴とするリチウムイオン二次電池の製造装置。 An electrode substrate feed roll for supplying the electrode substrate at a predetermined speed;
First, second and third rollers for conveying the electrode substrate at a predetermined speed;
A slit die coater for applying an electrode material to the electrode substrate from a position facing the first roller;
A curtain coater that coats an insulating material on a layer of electrode material on the electrode substrate from a position facing the second roller downstream of the slit die coater;
Downstream of the curtain coater, a drying furnace for heating and drying and fixing a layer of electrode material and insulating material applied on the electrode substrate;
An apparatus for manufacturing a lithium ion secondary battery, comprising: a winding roll that winds up the electrode substrate to which the electrode material and an insulating material are fixed. さらに、前記カーテンコータの下流、および前記乾燥炉の上流に、前記電極基板上の塗工膜高さを調整するナイフコータを備えたことを特徴とする請求項５に記載のリチウムイオン二次電池の製造装置。   The lithium ion secondary battery according to claim 5, further comprising a knife coater for adjusting a coating film height on the electrode substrate downstream of the curtain coater and upstream of the drying furnace. manufacturing device. 前記電極材料は、正極材料はコバルト酸リチウムからなる活物質と導電助剤としてのカーボンを混合し、ポリフッ化ビニリデンからなる結着剤をＮメチルピロリドンに溶解させた溶液に混練したスラリーを用い、
負極材料は炭素材料からなる負極活物質を、ポリフッ化ビニリデンからなる結着剤をＮメチルピロリドンに溶解させた溶液に混練したスラリーを用いることを特徴とする請求項５に記載のリチウムイオン二次電池の製造装置。 As the electrode material, a positive electrode material is a slurry in which an active material composed of lithium cobaltate and carbon as a conductive additive are mixed and kneaded into a solution in which a binder composed of polyvinylidene fluoride is dissolved in N-methylpyrrolidone ,
The negative electrode active material negative electrode material made of a carbon material, a lithium ion secondary described a binder consisting of polyvinylidene fluoride to claim 5, characterized by using a kneaded slurry solution prepared by dissolving N-methyl pyrrolidone order Battery manufacturing equipment. 前記絶縁材料は、シリカの粉体をポリフッ化ビニリデンからなる結着剤をＮメチルピロリドンに溶解させた溶液に混練したスラリーを用いることを特徴とする請求項５に記載のリチウムイオン二次電池の製造装置。 The insulating material is silica powder of the lithium-ion secondary battery according to claim 5, characterized by using a slurry of the binder made of polyvinylidene fluoride were kneaded in a solution prepared by dissolving in N-methylpyrrolidone manufacturing device.
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