SEPARATORS COMPRISING BONDING LAYER AND SECONDARY BATTERY USING THE SEPARATOR

• Main Authors: WOO, HEE JE, PARK, JIN KYU, KIM, BYUNG SOO, BAE, IM HYUCK
• Format: Patent
• Language: English; Korean
• Published: 24.04.2017
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention relates to a separation film and a secondary battery using the same. The present invention includes: a porous member; and an adhesive layer formed on a side or both sides of the porous member. The adhesive layer includes: a polyvinylidene fluoride (PVdF)-based first binder including a vinylidene fluoride origin unit and no more than 5 wt% of a hexafluoropropylene (HFP) origin unit; and a polyvinylidene fluoride (PVdF)-based second binder including a vinylidene fluoride origin unit and a hexafluoropropylene (HFP) origin unit and 10-30 wt% of the hexafluoropropylene (HFP) origin unit. A weight ratio between the polyvinylidene fluoride (PVdF)-based first binder and the polyvinylidene fluoride (PVdF)-based second binder is 0.5:9.5 to 2:8. As such, the present invention is capable of preventing the deformation of the shape of a battery. 다공성 기재; 및 상기 기재의 일면 또는 양면에 형성된 접착층을 포함하고, 상기 접착층은 비닐리덴플루오라이드 유래 단위를 포함하고 헥사플루오로프로필렌(HFP) 유래 단위 함량이 5 중량% 이하인 폴리비닐리덴플루오라이드(PVdF)계 제1 바인더와, 비닐리덴플루오라이드 유래 단위 및 헥사플루오로프로필렌(HFP) 유래 단위를 포함하고 상기 헥사플루오로프로필렌(HFP) 유래 단위 함량이 10 내지 30 중량%인 폴리비닐리덴플루오라이드(PVDF)계 제2 바인더를 포함하고, 상기 폴리비닐리덴플루오라이드(PVdF)계 제1 바인더와 상기 폴리비닐리덴플루오라이드(PVdF)계 제2 바인더의 중량비는 0.5:9.5 내지 2:8인 분리막 및 이를 포함하는 이차 전지에 관한 것이다.