KR20170130786A - 실리콘/실리콘 질화물 및 실리콘 카바이드 코어-쉘 복합체를 포함하는 탄소나노섬유 복합체 제조방법 - Google Patents
실리콘/실리콘 질화물 및 실리콘 카바이드 코어-쉘 복합체를 포함하는 탄소나노섬유 복합체 제조방법 Download PDFInfo
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Abstract
Description
도 2는 탄소나노섬유 복합체의 원시적 조건의 SEM 이미지와 TEM 이미지(a-e), 및 10 A/g의 전류밀도에서 1000회 사용 후 탄소나노섬유 복합체의 SEM 이미지와 TEM 이미지(f-i)를 나타낸 도면이며,
도 3은 50회(a), 100회(b), 500회(c), 및 1000회(d) 순환 후의 Ex-situ 방법을 통해 TEM을 비교한 도면이고,
도 4는 50회(a), 100회(b), 500회(c), 및 1000회(d) 순환 후의 암시야(dark-field) TEM 이미지 및 선의 윤곽 이미지를 나타낸 도면이며,
도 5는 50회(a), 100회(b), 500회(c), 및 1000회(d) 순환 후의 암시야(dark-field) TEM 이미지 및 원소 맵핑 이미지를 나타낸 도면이고,
도 6은 0.01 ~ 1.50 V 내의 0.2 mV/s 스캔속도 대 Li/Li+ 의 CV 곡선(a), 0.1 A/g에서 50 A/g까지 다양한 전류밀도에서 단계적으로 증가된 방전속도에 따른 탄소나노섬유 복합체의 고속도 순환 성능의 비교(b), 2000회 사용 후 10 A/g의 전류밀도에서 탄소나노섬유 복합체의 충전/방전 용량(c), 10 A/g의 전류밀도에서 탄소나노섬유 복합체의 충전/방전 프로파일(d), 1000회 사용 후 10 A/g의 전류밀도에서 탄소나노섬유 복합체의 시간/ 전압-전류 선도(e), 및 100 kHz와 10 mHz 사이의 주파수 범위에서, 1.5 V에서 측정된 탄소나노섬유 복합체의 나이퀴스트 선도(f)를 나타낸 도면이다.
Claims (9)
- 실리콘 나노입자로 이루어진 코어층; 및
상기 코어층을 감싸도록 형성되며, 실리콘 질화물 및 실리콘 카바이드(SiC)를 포함하는 쉘층으로 이루어진 코어-쉘 복합체가 탄소나노섬유에 분산되어 포함되는 것을 특징으로 하는, 탄소나노섬유 복합체. - 청구항 1에 있어서,
상기 실리콘 나노입자는,
50 내지 300 nm의 평균직경을 가지는 것을 특징으로 하는, 탄소나노섬유 복합체. - 청구항 1에 있어서,
상기 탄소나노섬유는,
200 내지 300 nm의 평균직경을 가지는 것을 특징으로 하는, 탄소나노섬유 복합체. - 청구항 1 또는 청구항 3 중 어느 한 항에 따른 복합체를 음극활물질로 포함하는 리튬이차전지.
- 폴리아크릴로나이트릴과 N-디메틸포름아마이드(N-dimethylformamide)로 이루어진 전기방사 용액을 준비하는 단계(제1단계);
상기 준비된 전기방사 용액에 실리콘(Si) 나노입자를 첨가한 후 교반하여 혼합용액을 준비하는 단계(제2단계);
상기 준비된 혼합용액을 전기방사기에 연결하여 Si 나노입자를 포함하는 폴리아크릴로나이트릴 나노섬유를 제작하는 단계(제3단계);
상기 제작된 Si 나노입자를 포함하는 폴리아크릴로나이트릴 나노섬유를 안정화 시키는 단계(제4단계); 및
상기 안정화된 Si 나노입자를 포함하는 폴리아크릴로나이트릴 나노섬유를 질소분위기에서 탄화시켜 Si 나노입자로 이루어진 코어층과 상기 코어층을 감싸도록 형성되며, 실리콘 질화물 및 실리콘 카바이드(SiC)를 포함하는 쉘층으로 이루어진 코어-쉘 복합체가 분산된 탄소나노섬유 복합체를 제조하는 단계(제5단계);를 포함하는, 탄소나노섬유 복합체 제조방법. - 청구항 5에 있어서,
상기 전기방사용액은,
폴리아크릴로나이트릴과 N-디메틸포름아마이드(N-dimethylformamide)를 1 : 5 내지 15의 중량비로 혼합되어 이루어진 것을 특징으로 하는, 탄소나노섬유 복합체 제조방법. - 청구항 5에 있어서,
상기 제2단계는,
상기 준비된 전기방사 용액에 실리콘(Si) 나노입자를 첨가한 후 1500 내지 2500 rpm 속도로 15 내지 45분 동안 교반하는 것을 특징으로 하는, 탄소나노섬유 복합체 제조방법. - 청구항 5에 있어서,
상기 제4단계는,
상기 제작된 Si 나노입자를 포함하는 폴리아크릴로나이트릴 나노섬유를 2 내지 4시간 동안 200 내지 300℃로 안정화하는 것을 특징으로 하는, 탄소나노섬유 복합체 제조방법. - 청구항 5에 있어서,
상기 제5단계는,
상기 안정화된 Si 나노입자를 포함하는 폴리아크릴로나이트릴 나노섬유를 질소분위기에서 2 내지 4℃/min의 가열속도로 2 내지 4시간 동안 1000 내지 1300℃에서 탄화시키는 것을 특징으로 하는, 탄소나노섬유 복합체 제조방법.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963201A (zh) * | 2018-05-28 | 2018-12-07 | 同济大学 | 一种硅碳自支撑复合负极材料及其制备方法与应用 |
| CN108987693A (zh) * | 2018-07-09 | 2018-12-11 | 浙江工业职业技术学院 | 一种用于锂电池的高性能碳硅复合材料的制备方法 |
| CN109546106A (zh) * | 2018-11-02 | 2019-03-29 | 河南电池研究院有限公司 | 一种高性能硅碳负极材料的制备方法 |
| CN110459732A (zh) * | 2019-08-14 | 2019-11-15 | 上海昱瓴新能源科技有限公司 | 一种硅/石墨烯/碳复合纤维膜负极极片及其制备方法和锂离子电池 |
| CN112289983A (zh) * | 2020-09-18 | 2021-01-29 | 合肥国轩高科动力能源有限公司 | 一种SiOx-MWCNTs/C核壳复合负极材料及其制备方法、应用 |
| CN114420912A (zh) * | 2022-01-24 | 2022-04-29 | 武汉科技大学 | 一种陶瓷相硅氮层包覆硅负级材料、制备方法及其应用 |
| CN115394980A (zh) * | 2022-08-23 | 2022-11-25 | 广东工业大学 | 一种锂离子电池硅碳纳米线材料及其制备方法和应用 |
| CN115832237A (zh) * | 2022-05-10 | 2023-03-21 | 江苏时代新能源科技有限公司 | 负极活性材料及其制备方法、负极极片、电池和用电设备 |
| KR20230080562A (ko) * | 2021-11-30 | 2023-06-07 | 한국세라믹기술원 | 고온 내산화성이 향상된 기능성 탄소 섬유 및 그 제조 방법 |
| WO2025014088A1 (ko) * | 2023-07-12 | 2025-01-16 | 주식회사 케이켐비즈 | 양극 및 이를 포함하는 이차 전지 |
| CN119601626A (zh) * | 2024-12-02 | 2025-03-11 | 武汉理工大学 | 一种氮化改性硅负极材料及其制备方法和应用 |
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Cited By (13)
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| CN108963201A (zh) * | 2018-05-28 | 2018-12-07 | 同济大学 | 一种硅碳自支撑复合负极材料及其制备方法与应用 |
| CN108987693A (zh) * | 2018-07-09 | 2018-12-11 | 浙江工业职业技术学院 | 一种用于锂电池的高性能碳硅复合材料的制备方法 |
| CN109546106A (zh) * | 2018-11-02 | 2019-03-29 | 河南电池研究院有限公司 | 一种高性能硅碳负极材料的制备方法 |
| CN110459732A (zh) * | 2019-08-14 | 2019-11-15 | 上海昱瓴新能源科技有限公司 | 一种硅/石墨烯/碳复合纤维膜负极极片及其制备方法和锂离子电池 |
| CN112289983B (zh) * | 2020-09-18 | 2022-09-06 | 合肥国轩高科动力能源有限公司 | 一种SiOx-MWCNTs/C核壳复合负极材料及其制备方法、应用 |
| CN112289983A (zh) * | 2020-09-18 | 2021-01-29 | 合肥国轩高科动力能源有限公司 | 一种SiOx-MWCNTs/C核壳复合负极材料及其制备方法、应用 |
| KR20230080562A (ko) * | 2021-11-30 | 2023-06-07 | 한국세라믹기술원 | 고온 내산화성이 향상된 기능성 탄소 섬유 및 그 제조 방법 |
| CN114420912A (zh) * | 2022-01-24 | 2022-04-29 | 武汉科技大学 | 一种陶瓷相硅氮层包覆硅负级材料、制备方法及其应用 |
| CN115832237A (zh) * | 2022-05-10 | 2023-03-21 | 江苏时代新能源科技有限公司 | 负极活性材料及其制备方法、负极极片、电池和用电设备 |
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| WO2025014088A1 (ko) * | 2023-07-12 | 2025-01-16 | 주식회사 케이켐비즈 | 양극 및 이를 포함하는 이차 전지 |
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