METHOD FOR PRE-LITHIATION OF NEGATIVE ELECTRODE, PRE-LITHIATED NEGATIVE ELECTRODE, AND LITHIUM SECONDARY BATTERY COMPRISING SAME

• Main Authors: CHAE, Oh-Byong, HWANG, Seung-Hae, KIM, Ye-Ri, JEON, Seo-Young, LEE, Su-Yeon
• Format: Patent
• Language: English; French; Korean
• Published: 26.08.2021
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

Provided are a method for pre-lithiating a negative electrode, a pre-lithiated negative electrode, and a lithium secondary battery comprising the pre-lithiated negative electrode, the method comprising the steps of: preparing a simplified cell by positioning a negative electrode between a lithium-ion-supplying metal sheet and a separator; immersing the simplified cell in an electrolyte solution for pre-lithiation; disposing the simplified cell immersed in the electrolyte solution for pre-lithiation between two polymer pads, and pre-lithiating the negative electrode by electrochemically charging the simplified cell while pressing the outer portion of the two polymer pads, wherein the thickness of the polymer pads is 60-90% of the thickness of a jig of the pressing member. L'invention concerne un procédé de pré-lithiation d'une électrode négative, une électrode négative pré-lithiée, et une batterie secondaire au lithium comprenant l'électrode négative pré-lithiée, le procédé comprenant les étapes consistant à : préparer une cellule simplifiée par positionnement d'une électrode négative entre une feuille métallique d'alimentation en lithium-ion et un séparateur ; immerger la cellule simplifiée dans une solution électrolytique pour la prélithiation ; disposer la cellule simplifiée immergée dans la solution électrolytique pour la pré-lithiation entre deux tampons polymères, et pré-lithiatier l'électrode négative par charge électrochimique de la cellule simplifiée tout en pressant la partie externe des deux tampons polymères, l'épaisseur des tampons polymères étant de 60 à 90 % de l'épaisseur d'un gabarit de l'élément de pressage. 리튬 이온 공급 금속시트와 분리막 사이에 음극을 개재시켜 간이 셀을 준비하는 단계; 상기 간이 셀을 전리튬화용 전해액에 침지하는 단계; 및 상기 전리튬화용 전해액에 침지된 간이 셀을 2개의 폴리머 패드 사이에 배치하고, 상기 2개의 폴리머 패드의 외측에 가압을 하면서 전기화학 충전을 시켜 상기 음극을 전리튬화하는 단계;를 포함하고, 상기 폴리머 패드의 두깨가 상기 가압 부재의 지그의 두께의 60 내지 90%인 음극의 전리튬화 방법, 전리튬화 음극, 상기 전리튬화 음극을 포함하는 리튬 이차전지가 제시된다.