MANUFACTURING METHOD FOR SEPARATOR FOR ELECTROCHEMICAL ELEMENT

• Main Authors: FUKUDA KUNIHIRO, KUWAGATA AKIRA, YOSHIDA SHIGEHARU
• Format: Patent
• Language: English; Japanese
• Published: 09.03.2022
• 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 manufacturing method for a separator for an electrochemical element, the method enabling suppression of a degradation in ion permeability even when a plurality of functional layers are used.SOLUTION: A manufacturing method for a separator for an electrochemical element including a first functional layer and a second functional layer on at least one side of a polyolefin porous membrane substrate is provided, the method includes a first coating step of coating the first functional layer, a second coating step of forming the second functional layer on the surface of the first functional layer before fixing the first coating film layer, and further includes a step of performing coating in such a manner that a region in which the second coating film layer is present and a region in which the second coating film layer is not present, thereby forming the second coating film layer, and fixing the first and second coating film layers at the same time.SELECTED DRAWING: None 【課題】複数の機能層を用いた場合であってもイオン透過性の低下を抑制できる電気化学素子用セパレータの製造方法を提供すること。【解決手段】ポリオレフィン製多孔質膜基材の少なくとも片面に第１の機能層および第２の機能層を有する電気化学素子用セパレータを製造する方法であって、前記第１の機能層をコーティングする第１塗工工程と、第１の塗膜層を固定する前に前記第１機能層の表面に前記第２の機能層を形成する第２塗工工程を含み、前記第２の塗膜層が存在する領域と前記第２の塗膜層が存在しない領域を形成するように塗工して、第２の塗膜層を形成し、前記第１、第２の塗膜層を同時に固定させる工程を含むことを特徴とする、電気化学素子用セパレータの製造方法。【選択図】なし