KR102465295B1 - 배터리 격막과 그 제조방법 및 응용 - Google Patents
배터리 격막과 그 제조방법 및 응용 Download PDFInfo
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Abstract
Description
도 1은 본 발명이 제조하는 리튬이온 배터리 격막의 겉보기 모습도이다.
도 2는 본 발명이 채용하는 Hydroformer 2층 수력식 경사망 성형기의 구조도로, 여기에서 A는 디스트리뷰터를 나타내고, B는 정류구역을 나타내고, C는 기재 성형구역을 나타내고, D는 성형 후의 기재 습지면을 나타낸다.
Claims (10)
- 리튬이온 배터리 격막에 있어서,
상기 격막은 리튬이온 배터리 격막 기재(基材) 및 무기코팅층으로 구성되고, 여기에서, 상기 리튬이온 배터리 격막 기재는 지탱층 및 치밀층으로 구성되고, 상기 무기코팅층은 상기 치밀층 상에 코팅되고,
상기 격막의 두께는 23-26μm이고; 상기 격막의 정량은 19-21 g/cm2이고; 상기 격막의 평균 구경은 0.22-0.26μm이고; 상기 격막의 최대 구경은 0.6-1μm이고; 상기 격막은 300˚C하에서의 열수축률이 2%보다 작거나 같고, 110˚C에서 열수축률이 0이고,
상기 무기코팅층의 도포량은 3-15g/m2이고;
상기 무기코팅층은 무기입자, 분산제, 보수제(water-retaining agent) 및 접착성 수지를 포함하거나 이것들로 제조되고;
상기 무기입자는 산화 알루미늄, 이산화규소, 뵘석(Boehmite), 수산화 마그네슘 중 일종 또는 다종으로부터 선택되고, 산화 알루미늄 및/또는 수화 마그네슘이고; 중량비로 계산되고, 상기 산화 알루미늄 및 수산화 마그네슘의 용량비는 1:1이고;
상기 무기입자의 입경(粒徑)은 3μm이하이고;
상기 분산제는 폴리카르복실레이트 암모늄 염이고; 상기 폴리카르복실레이트 암모늄 염의 점도는 100mPa·s보다 작고;
상기 보수제는 카르복시 메틸 셀룰로오스 소디움(CMC)이고; 상기 카르복시 메틸 셀룰로오스 소디움(CMC)의 점도는 10-50mPa·s이고;
상기 접착성 수지는 아크릴산 에스테르 또는 부타디엔-스티렌 라텍스이고; 상기 접착성 수지의 점도는 1000mPa·s보다 작고;
상기 무기코팅층에 있어서, 중량백분률로 계산하고, 상기 무기입자의 함량은 80-87wt%이고;
상기 무기코팅층에 있어서, 중량백분률로 계산하고, 상기 분산제의 함량은 0.5-2wt%이고;
상기 무기코팅층에 있어서, 중량백분률로 계산하고, 상기 보수제의 함량은 0.5-4wt%이고;
상기 무기코팅층에 있어서, 중량백분률로 계산하고, 상기 접착성 수지의 함량은 10-17wt%이고,
상기 리튬이온 배터리 격막 기재는, 중량백분률로 계산되고, 상기 지탱층은 전체 정량의 95wt%를 차지하고, 상기 치밀층은 전체 정량의 5wt%를 차지하고, 상기 지탱층은 65wt%의 극세 주간 섬유, 30wt%의 열가소성 접착 섬유 및 5wt%의 제1 나노 섬유로 제조되고, 상기 기재의 두께는 10-25μm이고; 상기 기재의 정량은 8-17g/m2이고; 상기 기재의 평균 구경(diameter)은 3μm보다 작고; 상기 기재의 최대 구경은 5μm보다 작은 것을 특징으로 하는,
리튬이온 배터리 격막. - 삭제
- 제1항에 있어서,
상기 지탱층은 극세 주간(main culm) 섬유, 열가소성 접착 섬유 및 제1 나노 섬유를 포함하거나 이것들로 제조되고, 상기 치밀층은 제2 나노 섬유를 포함하거나 이것으로 제조되고;
상기 극세 주간 섬유는 연신(stretched) 폴리에틸렌 테레프탈레이트 섬유(연신PET), 폴리아크릴로니트릴 섬유(PAN) 및/또는 폴리아미드 섬유(PA)이고;
중량비로 계산하고, 상기 연신(stretched) 폴리에틸렌 테레프탈레이트 섬유(연신PET), 폴리아크릴로니트릴 섬유(PAN) 및 폴리아미드 섬유(PA)의 용량비는 1-1.2:1-1.2:1이고;
상기 열가소성 접착 섬유는 미연신(stretched) 폴리에틸렌 테레프탈레이트 섬유(미연신PET), 이성분 PET/co-PET 섬유 또는 이성분 PP/PE 섬유이고;
상기 제1 나노 섬유 및 상기 제2 나노 섬유는 각각 독립적으로 피브릴화 폴리-p-페닐렌 테레프타마이드(PPTA) 나노 섬유, 피브릴화 텐셀(tencel) 나노 섬유, 피브릴화 폴리(p-페닐렌-2,6-벤조옥사졸)(PBO) 나노 섬유 또는 피브릴화 폴리아크릴로니트릴(PAN) 나노 섬유이고;
상기 제2 나노 섬유는 피브릴화 폴리-p-페닐렌 테레프타마이드(PPTA) 나노 섬유 및/또는 피브릴화 텐셀(tencel) 나노 섬유이고; 중량비로 계산되고, 상기 피브릴화 폴리-p-페닐렌 테레프타마이드(PPTA) 나노 섬유 및 피브릴화 텐셀(tencel) 나노 섬유의 용량비는 1:1-4이고;
상기 극세 주간 섬유의 직경은 0.1-6μm이고; 상기 극세 주간 섬유의 섬유 길이는 1-6mm이고;
상기 열가소성 접착 섬유의 직경은 0.1-8μm이고; 상기 열가소성 접착 섬유의 섬유 길이는 1-6mm이고;
상기 제1 나노 섬유 및 상기 제2 나노 섬유의 비팅도(beating degree)는 60-95°SR이고;
상기 피브릴화 텐셀 나노 섬유의 비팅도는 70-95°SR이고;
상기 피브릴화 폴리-p-페닐렌 테레프타마이드(PPTA) 나노 섬유의 비팅도는 60-85°SR이고;
상기 피브릴화 폴리(p-페닐렌-2,6-벤조옥사졸)(PBO) 나노 섬유 및 상기 피브릴화 폴리아크릴로니트릴(PAN) 나노 섬유의 비팅도는 85°SR인 것을 특징으로 하는,
리튬이온 배터리 격막. - 삭제
- 삭제
- 삭제
- 삭제
- 제1항의 리튬이온 배터리 격막을 제조하는 방법에 있어서,
상기 방법은 무기코팅층을 균일하게 리튬이온 배터리 격막 기재의 치밀층 표면에 도포한 후, 열풍 건조하고; 열풍온도는 80-150℃이고;
상기 무기코팅층의 도포량은 3-15g/m2이고;
상기 리튬이온 배터리 격막 기재의 제조방법은 이하의 순차적 단계를 포함:
단계 a: 각각 지탱층 및 치밀층의 섬유 원료를 물과 혼합하고, 각각 독립적으로 해리, 비트(beat), 혼합한 후 펄프를 획득하고, 비팅 펌프를 채용하여 펄핑농도까지 가수희석하고;
단계 b: 희석 후의 지탱층 및 치밀층 펄프를 Hydroformer 2층 수력식 경사망 성형기 디스트리뷰터로 전달하고, 여기에서, 치밀층 펄프는 상층 통로로 진입하고, 지탱층 펄프는 성형망에 근접한 통로로 진입하고, 각 통로 펄프 흐름은 잇달아 동일한 구역에 적층됨과 동시에 제지 성형되고, 탈수 처리를 거쳐 습지면을 획득하여, 기재 습지면을 형성하고; 제지 전에, 펄프의 정류를 더 포함하여, 펄프가 고강도 미세진동의 유동 상태를 나타내도록 하고;
단계 c: 상기 단계 b 이후, 기재 습지면은 프라임드라이 양키(PrimeDry Steel Yankee) 건조 처리를 거쳐 기재 건지(dried paper)면을 획득하고;
단계 d: 상기 단계 c 이후, 기재 건지면은 금속롤러 및 소프트롤러 평탄화(smoothing) 처리를 거쳐 기재를 획득하고;
단계 a에서, 펄프를 가수희석하기 전, 지탱층 및 치밀층 펄프의 고체 중량백분률 농도는 모두 0.2wt%이고;
단계 a에서, 상기 지탱층 펄프의 펄핑농도는 0.01-0.05wt%이고; 상기 치밀층 펄프의 펄핑농도는 0.002-0.05wt%이고;
단계 b에서, 상기 지탱층 펄프의 통로 유량은 160-3000 m3/h이고; 상기 치밀층 펄프의 통로 유량은 40-750m3/h이고;
단계 c에서, 상기 건조 온도는 80-130℃이고;
단계 d에서, 상기 평탄화 처리 온도는 110-220℃이고;
상기 지탱층의 열가소성 접착 섬유가 미연성 PET 섬유일 때, 그것의 건조온도는 80-130℃이고, 그것의 평탄화 처리 온도는 170-220℃이고;
상기 지탱층의 열가소성 접착 섬유는 이성분 PET/co-PET 섬유 또는 이성분 PP/PE 섬유이고, 그것의 건조온도는 80-130℃이고, 그것의 평탄화 처리 온도는 110-140℃인 것을 특징으로 하는,
리튬이온 배터리 격막을 제조하는 방법. - 제8항에 있어서,
상기 무기코팅층은:
무기코팅층의 구성에 따라, 분산제 및 보수제를 차례로 탈염수에 첨가하여 교반하고, 무기입자를 첨가하고, 분산시키고, 필터를 거쳐 필터링하여 분산액을 획득하고, 분산액에 접착성 수지를 첨가하여 계속 분산시키고, 무기코팅층 펄프를 제조 획득하고;
여기에서, 무기코팅층의 구성은 제1항에서 서술한 바와 같고;
상기 무기 입자는 2500r/min에서 30분 동안 분산시키고;
상기 접착성 수지는 분산액 중에서 고르게 15분 동안 분산시키고,
상기 필터는 320목(0.0256μm) 필터이고;
상기 무기코팅층 펄프의 고정함량은 40-60%이고, 50wt%인 것을 특징으로 하는,
리튬이온 배터리 격막을 제조하는 방법. - 리튬이온 배터리에 있어서,
제1항의 리튬이온 배터리 격막을 포함하는,
리튬이온 배터리.
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