ELECTROLYTIC COPPER FOIL AND SECONDARY BATTERY COMPRISING THE SAME

• Main Authors: MOON HONGGI, SEUNGHWAN KIM, SANGBEOM KIM
• Format: Patent
• Language: English; Korean
• Published: 03.07.2023
• Subjects: APPARATUS THEREFOR; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; METALLURGY; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention provides an electrolytic copper foil with improved elongation and electrical conductivity due to a selective increase in shape deformation in a specific direction of grains and an increase in average grain size after heat treatment, an electrode for a secondary battery including the electrolytic copper foil, and a secondary battery including the same. The electrolytic copper foil of the present invention comprises a copper layer having one side and the other side. The copper layer includes a plurality of grains, and when analyzed by electron beam backscattering diffraction (EBSD) after heat treatment at 200℃, for 1 hour, the grain index (G rate) defined in Equation 1 below is 50%. [Equation 1] Grain index (G rate, %) = G_(1/3) / G_T >= 50 본 발명은 열처리 후 그레인의 특정 방향에 선택적인 형태변형 증가, 및 평균 그레인 크기 증가로 인해 연신율 및 전기전도도가 개선된 전해동박, 상기 전해동박을 포함하는 이차전지용 전극 및 이차전지를 제공한다.