METHOD OF MANUFACTURING SECONDARY BATTERY ELECTRODE

• Main Authors: KITAYOSHI MASANORI, SHIONOYA HARUKA, ENOHARA KATSUSHI, MASHITA NAOHIRO
• Format: Patent
• Language: English; Japanese
• Published: 26.09.2022
• Subjects: BASIC ELECTRIC ELEMENTS; CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a method of manufacturing an electrode capable of suppressing generation of cracks and wrinkles at irregular intervals by improving followability of a coating film to an electrode current collector.SOLUTION: A method of manufacturing an electrode includes the following steps of: preparing a wet powder formed from agglomerated particles at least containing an electrode active material, a binder resin, and a solvent; depositing a coating film (32) formed of the wet powder on an electrode current collector (12) while leaving a gas phase of the coating film by using the wet powder so that an average film thickness of the coating film becomes equal to or more than 50 μm; transporting the coating film on the current collector and transcribing unevenness by using a roll to form at least one groove (22) extending in a transportation direction at the center of a surface part of the coating film so that a depth of the groove satisfies (9/10*t1)>t2; and drying the coating film formed on the current collector to form an electrode active material layer.SELECTED DRAWING: Figure 4 【課題】電極集電体に対する塗膜の追従性を向上させることで、不規則な間隔のクラックやシワの発生を抑制する、電極の製造方法を提供すること。【解決手段】ここで開示される電極の製造方法は、電極活物質とバインダ樹脂と溶媒とを少なくとも含有した凝集粒子によって形成される湿潤粉体を用意する工程；前記湿潤粉体を用いて、電極集電体（１２）上に該湿潤粉体からなる塗膜（３２）を、該塗膜の気相を残した状態で、前記塗膜の平均膜厚が５０μｍ以上となるように成膜する工程；前記集電体上の塗膜を搬送し、ロール型を用いて凹凸転写することにより、該塗膜の表面部中央に搬送方向に沿って延びる溝（２２）を前記溝の深さが、（９／１０×ｔ１）＞ｔ２を満たすように少なくとも１本形成する工程；および、前記集電体上に形成された塗膜を乾燥させて電極活物質層を形成する工程；を包含する。【選択図】図４