METHOD FOR PRODUCING ELECTRODE SHEET

• Main Authors: MATSUYAMA MIYUKI, OKUBO SOKICHI, SHIMAZAKI MIGIWA, UEZONO TOMOYUKI, WATANABE MASAKI, MIYAJIMA MOMOKA
• Format: Patent
• Language: English; Japanese
• Published: 24.06.2022
• Subjects: APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; BASIC ELECTRIC ELEMENTS; ELECTRICITY; PERFORMING OPERATIONS; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SPRAYING OR ATOMISING IN GENERAL; TRANSPORTING

To provide a method for producing an electrode sheet, capable of suppressing such a problem that "a part of an electrode mixture layer is detached (peeled off) from a surface of a current collector foil and transferred onto an outer peripheral surface of a first roll".SOLUTION: A method for producing an electrode sheet includes the steps of: heating before pressing to heat an electrode sheet 100 to soften or melt binder particles 122 contained in an electrode mixture layer 120; and roll-pressing to roll-press the electrode sheet 100 by use of first and second rolls, the electrode sheet being heated in the step of heating before pressing. In the step of roll-pressing, a temperature of an outer peripheral surface 40b of a first roll 40 with which an outer surface 120b of the electrode mixture layer 120 of the electrode sheet 100 contacts is set lower than a temperature of an outer peripheral surface 50b of the second roll 50, and the electrode sheet 100 is roll-pressed so that adhesive strength of the binder particles 122 in the electrode mixture layer 120 to the first roll 40 is reduced so as to become lower than adhesive strength to the current collector foil 110.SELECTED DRAWING: Figure 1 【課題】「電極合材層の一部が、集電箔の表面上から脱離（剥離）して第１ロールの外周面に転写されてしまうこと」を低減することができる電極シートの製造方法を提供する。【解決手段】電極シート１００を加熱して、電極合材層１２０に含まれるバインダ粒子１２２を軟化または溶融させるプレス前加熱工程と、プレス前加熱工程で加熱した電極シート１００を、第１ロールと第２ロールとでロールプレスするロールプレス工程とを備える。ロールプレス工程は、電極シート１００の電極合材層１２０の外側表面１２０ｂが接触する第１ロール４０の外周面４０ｂの温度を、第２ロール５０の外周面５０ｂの温度よりも低くして、電極シート１００をロールプレスすることによって、電極合材層１２０内のバインダ粒子１２２について、第１ロール４０に対する粘着力を集電箔１１０に対する粘着力よりも低下させる。【選択図】図１