KR102259381B1 - 바이폴라 전극을 포함하는 플렉서블 이차전지 - Google Patents
바이폴라 전극을 포함하는 플렉서블 이차전지 Download PDFInfo
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- KR102259381B1 KR102259381B1 KR1020180167968A KR20180167968A KR102259381B1 KR 102259381 B1 KR102259381 B1 KR 102259381B1 KR 1020180167968 A KR1020180167968 A KR 1020180167968A KR 20180167968 A KR20180167968 A KR 20180167968A KR 102259381 B1 KR102259381 B1 KR 102259381B1
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Abstract
Description
도 1은 본 발명의 일 실시형태에 따른 플렉시블 이차전지의 구조를 나타낸 것이다.
도 2는 본 발명의 일 실시형태에 따른 플렉시블 이차전지에 포함된 시트형 내부전극의 구조를 나타낸 것이다.
도 3a은 본 발명의 일 실시형태에 따른 플렉시블 이차전지에 포함된 시트형 바이폴라 전극의 구조를 나타낸 것이다.
도 3b는 본 발명의 일 실시형태에 따른 플렉시블 이차전지에 포함된 1 이상의 시트형 바이폴라 전극 및 그 사이에 고체전해질층이 배치된 구조를 나타낸 것이다.
도 4는 본 발명의 일 실시형태에 따른 플렉시블 이차전지에 포함된 시트형 외부전극의 구조를 나타낸 것이다.
도 5은 본 발명의 일 실시형태에 따른 플렉시블 이차전지를 나타낸 것이다.
200: 내부전극
300: 제1 고체전해질층
400: 바이폴라 전극
500: 제2 고체전해질층
600: 외부전극
700: 알루미늄 파우치층
800: 고분자 보호피복
Claims (14)
- 전극 지지체;
상기 전극 지지체의 외측에 나선형으로 권취되어 있는 시트형의 내부전극;
상기 내부전극의 외측에 나선형으로 권취되어 있는 시트형의 제1 고체전해질층;
상기 제1 고체전해질층의 외측에 나선형으로 권취되어 있는 시트형의 바이폴라(bipolar) 전극;
상기 바이폴라 전극의 외측에 나선형으로 권취되어 있는 시트형의 제2 고체전해질층; 및
상기 제2 고체전해질층의 외측에 나선형으로 권취되어 있는 시트형의 외부전극을 포함하고,
상기 제1 고체전해질층 및 제2 고체전해질층은 유기 고체전해질을 포함하며,
상기 내부전극 및 외부전극은 상기 제1 고체전해질층 및 제2 고체전해질층에 각각 대면하는 일 측면의 길이 방향의 양 단부에 절연 코팅부를 구비하고, 상기 바이폴라 전극은 양 측면의 길이 방향의 양 단부에 절연 코팅부를 구비하는 플렉시블 이차전지. - 제1항에 있어서,
상기 내부전극 및 외부전극은 길이 방향의 양 단부에 구비된 절연 코팅부가 상기 제1 고체전해질층 및 제2 고체전해질층에 각각 대면하도록 권취되어 있는 플렉시블 이차전지. - 제1항에 있어서,
상기 바이폴라 전극과 상기 제2 고체전해질층 사이에, 하나 이상의 시트형 고체전해질층 및 시트형 바이폴라 전극을 더 구비하는 플렉시블 이차전지. - 제1항에 있어서,
상기 유기 고체전해질이 폴리에틸렌 옥사이드(polyethylene oxide, PEO), 폴리프로필렌 옥사이드(polypropylene oxide, PPO), 폴리에틸렌 이민(polyethylene imine, PEI), 폴리에틸렌 설파이드(polyethylene sulphide, PES) 및 폴리비닐아세테이트 (polyvinyl acetate, PVAc)로부터 선택되는 고체 고분자 전해질, 또는
폴리에틸렌 옥사이드(polyethylene oxide, PEO), 폴리비닐리덴플루오라이드(polyvinylidene fluoride, PVdF), 폴리비닐리덴플루오라이드-헥사플루오로프로필렌(poly(vinylidene fluoride-hexafluoropropylene, PVdF-HFP), 폴리메틸메타아크릴레이트(poly(methyl methacrylate), PMMA), 폴리아크릴로니트릴(polyacrylonitrile, PAN) 및 폴리비닐아세테이트 (polyvinyl acetate, PVAc)로부터 선택되는 고분자를 사용하는 겔형 고분자 전해질인 플렉시블 이차전지. - 제1항에 있어서,
상기 시트형의 내부전극에 구비된 길이 방향의 절연 코팅부는 상기 시트형의 내부전극의 폭을 기준으로 1 내지 50%의 폭을 가지고,
상기 시트형의 바이폴라 전극에 구비된 길이 방향의 절연 코팅부는 상기 시트형의 바이폴라 전극의 폭을 기준으로 1 내지 50%의 폭을 가지고,
상기 시트형의 외부전극에 구비된 길이 방향의 절연 코팅부는 상기 시트형의 외부전극의 폭을 기준으로 1 내지 50%의 폭을 갖는 플렉시블 이차전지. - 제1항에 있어서,
상기 절연 코팅부는 Fe, Ca, Ba, Zn, Al, Ni, Sn, Cu, Cr, Cd, Nd, Mn, Mo, Si, Ti, W, Bi, Sr, Li, Y, Mg, Ce, Hf, 및 V로 이루어진 군으로부터 선택된 원소의 산화물, 탄화물, 질화물, 또는 이들 중 2 이상의 혼합물을 포함하는 플렉시블 이차전지. - 제1항에 있어서,
상기 절연 코팅부는 산화물계 고체전해질을 포함하는 플렉시블 이차전지. - 제7항에 있어서,
상기 산화물계 고체전해질은 Li3xLa2/3-xTiO3(LLTO)(0<x<1), Li7La3Zr2O12(LLZO), Li1+xAlxTi2-X(PO4)3(LATP)(0<x<1), Li1+xAlxGe2-X(PO4)3(LAGP)(0<x<1), Li1.4Zn(GeO4)4, Li3N, Li3+yPO4-xNx (LIPON)(0<x<4, 0<y<3), Li3.6Si0.6P0.4O4 또는 이들의 혼합물을 포함하는 플렉시블 이차전지. - 제1항에 있어서,
상기 내부전극은 내부집전체 및 상기 내부집전체의 일면에 형성된 내부전극 활물질층을 포함하고,
상기 외부전극은 외부집전체 및 상기 외부집전체의 일면에 형성된 외부전극 활물질층을 포함하는 플렉시블 이차전지. - 제1항에 있어서,
상기 바이폴라 전극은 바이폴라전극 집전체, 상기 집전체의 일면에 형성된 양극 활물질층, 및 상기 집전체의 타면에 형성된 음극 활물질층을 포함하는 플렉시블 이차전지. - 제1항에 있어서,
상기 시트형의 내부전극, 제1 고체전해질층, 바이폴라 전극, 제2 고체전해질층 및 외부전극은 일측 방향으로 연장된 스트립 구조인 플렉시블 이차전지. - 제1항에 있어서,
상기 전극 지지체는 내부에 공간이 형성되어 있는 열린 구조인 플렉시블 이차전지. - 제1항에 있어서,
상기 전극 지지체는 나선형으로 권취된 하나 이상의 와이어, 나선형으로 권취된 하나 이상의 시트, 꼬인 와이어, 선형 와이어, 중공사, 메쉬형 지지체, 서로 평행하게 배치된 2 이상의 선형 와이어 지지체, 또는 서로 교차하도록 나선형으로 권취된 2개 이상의 와이어형 지지체를 포함하는 플렉시블 이차전지. - 제1항에 있어서,
상기 플렉시블 이차전지의 외면을 둘러싸도록 형성된 보호피복을 더 포함하는 플렉시블 이차전지.
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