KR102094993B1 - 리튬 이차전지용 음극 및 이를 채용한 리튬 이차전지 - Google Patents
리튬 이차전지용 음극 및 이를 채용한 리튬 이차전지 Download PDFInfo
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Abstract
Description
도 2는 본 발명의 실시예 및 비교예에 따른 복합 음극 활물질을 포함하는 전지의 초기 충방전 곡선을 나타낸 그래프이다.
도 3은 본 발명의 실시예 및 비교예에 따른 복합 음극 활물질을 포함하는 전지의 용량 유지율을 나타낸 그래프이다.
No. | 충전 용량 (mAh/g) |
방전 용량 (mAh/g) |
초기 효율 (%) |
용량 유지율 (%) |
비교예 1 | 1,984 | 1,366 | 68.9 | 89.2 |
비교예 2 | 2,180 | 1,525 | 71.0 | 55.2 |
실시예 1 | 2,366 | 1,666 | 70.5 | 90.0 |
실시예 2 | 2,115 | 1,492 | 70.5 | 89.3 |
실시예 3 | 2,100 | 1,480 | 70.5 | 89.5 |
실시예 4 | 2,350 | 1,657 | 70.5 | 90.3 |
실시예 5 | 2,366 | 1,710 | 72.3 | 90.2 |
실시예 6 | 2,285 | 1,635 | 71.6 | 90.8 |
실시예 7 | 2,271 | 1,636 | 72.1 | 90.6 |
12: 수용성 고분자
13: 폴리이미드계 바인더
Claims (11)
- 복수의 금속 입자 및 탄소 재료가 혼합된 복합체를 포함하는 금속계 음극 활물질 및 상기 금속계 음극 활물질 표면에 코팅된 수용성 고분자를 포함하는 복합 음극 활물질; 및
폴리이미드계 바인더;를 포함하고,
상기 금속계 음극 활물질은 규소-탄소재료 복합체, 주석-탄소재료 복합체, 게르마늄-탄소재료 복합체 및 이들의 조합으로부터 선택되고,
상기 탄소 재료는 탄소나노튜브, 천연 흑연, 인조흑연, 탄소 섬유, 구상 탄소 및 그래핀 중에서 선택된 1종 이상을 포함하고,
상기 수용성 고분자는 상기 복합 음극 활물질 중 3.6 내지 20 중량%의 양으로 포함된 리튬 이차전지용 음극. - 제1항에 있어서,
상기 수용성 고분자는 카르복시메틸 셀룰로오즈, 카르복시메틸 셀룰로오즈 나트륨염, 카르복시메틸 셀룰로오즈 암모늄염, 메틸 셀룰로오즈, 하이드록시 메틸 셀룰로오즈, 하이드록시 프로필 셀룰로오즈, 에틸 셀룰로오즈, 폴리비닐알콜, 폴리아크릴산, 알칼리 양이온 또는 암모늄 이온으로 치환된 폴리아크릴산, 알칼리 양이온 또는 암모늄이온으로 치환된 폴리(알킬렌-무수말레인산) 공중합체, 알칼리 양이온 또는 암모늄이온으로 치환된 폴리(알킬렌-말레인산) 공중합체, 폴리에틸렌옥사이드, 알긴산 및 알긴산나트륨염으로 이루어진 군에서 선택된 1종 이상인 리튬 이차전지용 음극. - 제1항에 있어서,
상기 수용성 고분자는 상기 복합 음극 활물질 중 3.61 내지 20 중량%의 양으로 포함된 리튬 이차전지용 음극. - 제1항에 있어서,
상기 수용성 고분자는 상기 복합 음극 활물질 중 3.6 내지 6.3 중량%의 양으로 포함된 리튬 이차전지용 음극. - 제1항에 있어서,
상기 수용성 고분자는 상기 복합 음극 활물질 중 3.61 내지 6.25 중량%의 양으로 포함된 리튬 이차전지용 음극. - 제1항에 있어서,
상기 금속계 음극활물질 표면에 금속 산화물 물질을 더 포함하는 리튬 이차전지용 음극. - 제6항에 있어서,
상기 금속 산화물 물질은 리튬티타늄산화물, 산화알루미늄, 산화규소, 산화티타늄 및 산화아연 중에서 선택된 1종 이상인 리튬 이차전지용 음극. - 제1항에 있어서,
상기 폴리이미드계 바인더는 상기 리튬 이차전지용 음극 중 5 내지 30 중량%의 양으로 포함된 리튬 이차전지용 음극. - 제1항에 있어서,
상기 폴리이미드계 바인더는 폴리아미드이미드, 폴리아미드 및 폴리이미드중에서 선택된 1종 이상인 리튬 이차전지용 음극. - 복수의 금속 입자 및 탄소 재료가 혼합된 복합체를 포함하는 금속계 음극 활물질 입자, 수용성 고분자 및 물을 포함하는 혼합물을 제조하는 단계;
상기 혼합물을 건조하여 복합 음극 활물질을 제조하는 단계;
상기 복합 음극 활물질, 폴리이미드계 바인더 및 유기 용매를 포함하는 슬러리를 제조하는 단계; 및
상기 슬러리를 집전체상에 코팅하는 단계
를 포함하는 제1항에 따른 리튬 이차전지용 음극의 제조방법. - 양극;
제1항 내지 제9항 중 어느 한 항에 따른 음극;
상기 양극과 음극 사이에 위치하는 세퍼레이터; 및
전해액을 포함하는 리튬 이차전지.
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