KR101628729B1 - 흑연-타이타늄계 옥사이드 복합체의 제조방법 - Google Patents
흑연-타이타늄계 옥사이드 복합체의 제조방법 Download PDFInfo
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- KR101628729B1 KR101628729B1 KR1020140105975A KR20140105975A KR101628729B1 KR 101628729 B1 KR101628729 B1 KR 101628729B1 KR 1020140105975 A KR1020140105975 A KR 1020140105975A KR 20140105975 A KR20140105975 A KR 20140105975A KR 101628729 B1 KR101628729 B1 KR 101628729B1
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Abstract
본 발명의 흑연-타이타늄계 옥사이드 복합체의 제조방법에 따르면, 흑연 표면에 타이타늄계 옥사이드를 균일하게 코팅함으로써 충방전 시 발생하는 전해질 분해에 의한 SEI 필름(Solid electrolyte interphase) 형성을 안정화시켜 흑연의 구조 붕괴를 지연시키고, 이를 통해 안정적인 충방전 특성의 확보와 그에 따른 우수한 수명 특성의 확보가 가능하다. 또한 흑연 표면에서 리튬 이온 이외에 전해질의 극성 용매분자 삽입을 감소시켜 율속 특성의 향상 또한 가능하다.
Description
도 2는 흑연 및 실시예 2의 흑연-타이타늄 옥사이드 복합체의 X선 회절 분석 그래프이다.
도 3은 흑연의 주사전자현미경 사진이다.
도 4는 흑연-리튬 타이타늄 옥사이드 복합체(타이타늄 전구체: 10%)의 주사전자현미경 사진이다.
도 5는 흑연-리튬 타이타늄 옥사이드 복합체(타이타늄 전구체: 20%)의 주사전자현미경 사진이다.
도 6은 흑연-타이타늄 옥사이드 복합체(타이타늄 전구체: 10%)의 주사전자현미경 사진이다.
도 7은 흑연-타이타늄 옥사이드 복합체(타이타늄 전구체: 20%)의 주사전자현미경 사진이다.
도 8은 흑연 및 실시예 1의 흑연-리튬 타이타늄 옥사이드 복합체의 방전용량 및 효율을 나타낸 그래프이다.
도 9는 흑연 및 실시예 2의 흑연-타이타늄 옥사이드 복합체의 방전용량 및 효율을 나타낸 그래프이다.
도 10은 흑연의 충방전 율속특성의 측정 결과를 나타낸 그래프이다.
도 11은 흑연-리튬 타이타늄 옥사이드 복합체(타이타늄 전구체: 10%)의 충방전 율속특성의 측정 결과를 나타낸 그래프이다.
도 12은 흑연-리튬 타이타늄 옥사이드 복합체(타이타늄 전구체: 20%)의 충방전 율속특성의 측정 결과를 나타낸 그래프이다.
도 13은 흑연-타이타늄 옥사이드 복합체(타이타늄 전구체: 10%)의 충방전 율속특성의 측정 결과를 나타낸 그래프이다.
도 14은 흑연-타이타늄 옥사이드 복합체(타이타늄 전구체: 20%)의 충방전 율속특성의 측정 결과를 나타낸 그래프이다.
도 15는 증류수에 HNO3를 첨가하여 pH를 낮춘 상태로 가수분해시킨 TiO2의 사진이다.
도 16은 증류수에 NH4OH를 첨가하여 pH를 높인 상태로 가수분해시킨 TiO2의 사진이다.
Claims (15)
- 졸-갤(sol-gel)법을 이용하여 흑연을 벤질알콜 또는 셀룰로오스계 물질로 표면 개질하는 단계(S1);
상기 벤질알콜 또는 셀룰로오스계 물질로 표면 개질된 흑연을 용매에 분산시키고 타이타늄 전구체를 첨가한 후 혼합하는 단계(S2); 및
상기 S2 단계에서 얻은 혼합물을 열처리하여 흑연 표면에 타이타늄계 옥사이드를 성장시키는 단계(S3);를 포함하는 것을 특징으로 하는 흑연-타이타늄계 옥사이드 복합체의 제조방법.
- 제1항에 있어서,
상기 용매는 에탄올과 증류수 또는 에탄올과 과산화수소 혼합액인 것을 특징으로 하는 흑연-타이타늄계 옥사이드 복합체의 제조방법.
- 제2항에 있어서,
상기 증류수에는 NH4OH 또는 HNO3가 첨가되는 것을 특징으로 하는 흑연-타이타늄계 옥사이드 복합체의 제조방법.
- 제2항에 있어서,
상기 에탄올과 증류수 혼합액에서 에탄올과 증류수의 중량비는 5:1~100:1인 것을 특징으로 하는 흑연-타이타늄계 옥사이드 복합체의 제조방법.
- 제2항에 있어서,
상기 에탄올과 과산화수소 혼합액에서 에탄올과 과산화수소의 중량비는 5:1~100:1인 것을 특징으로 하는 흑연-타이타늄계 옥사이드 복합체의 제조방법.
- 제1항에 있어서,
상기 S2 단계에서 흑연 100 중량부 대비 타이타늄 전구체 5 내지 40 중량부가 첨가되는 것을 특징으로 하는 흑연-타이타늄계 옥사이드 복합체의 제조방법.
- 제1항에 있어서,
상기 타이타늄 전구체는 타이타늄부톡사이드 또는 타이타늄이소프로폭사이드인 것을 특징으로 하는 흑연-타이타늄계 옥사이드 복합체의 제조방법.
- 제1항에 있어서,
상기 열처리는 Ar 분위기에서 600 내지 800℃의 온도로 2 내지 5시간 동안 이루어지는 것을 특징으로 하는 흑연-타이타늄계 옥사이드 복합체의 제조방법.
- 제1항에 있어서,
상기 S2 단계 후 상기 S2 단계에서 얻어진 혼합물에 리튬 전구체를 혼합하여 수열합성하는 단계를 더 포함하는 것을 특징으로 하는 흑연-타이타늄계 옥사이드 복합체의 제조방법.
- 제9항에 있어서,
상기 수열합성은 80 내지 180℃의 온도에서 10 내지 12 시간 동안 수행되는 것을 특징으로 하는 흑연-타이타늄계 옥사이드 복합체의 제조방법.
- 제9항에 있어서,
상기 리튬 전구체의 첨가량은 흑연 100 중량부 대비 10 내지 80 중량부인 것을 특징으로 하는 흑연-타이타늄계 옥사이드 복합체의 제조방법.
- 제9항에 있어서,
상기 리튬 전구체는 리튬하이드록사이드, 리튬아세테이트다이하이드레이트 및 리튬나이트레이트로 구성된 군으로부터 선택된 어느 하나인 것을 특징으로 하는 흑연-타이타늄계 옥사이드 복합체의 제조방법.
- 흑연;
상기 흑연 표면에 결합된 벤질 알콜 또는 셀룰로오스계 물질; 및
상기 벤질 알콜 또는 셀룰로오스계 물질과 결합되는 타이타늄계 옥사이드 입자를 포함하는 것을 특징으로 하는 흑연-타이타늄계 옥사이드 복합체.
- 제13항의 흑연-타이타늄계 옥사이드 복합체를 포함하는 이차전지의 음극 활물질.
- 제14항의 음극 활물질을 포함하는 이차전지.
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US15/034,046 US10062899B2 (en) | 2013-08-19 | 2014-08-18 | Method for preparing graphite-titanium oxide composite |
CN201480045732.0A CN105493320B (zh) | 2013-08-19 | 2014-08-18 | 石墨-钛氧化物复合体的制造方法 |
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KR20150021456A (ko) | 2015-03-02 |
US10062899B2 (en) | 2018-08-28 |
US20170271650A1 (en) | 2017-09-21 |
CN105493320B (zh) | 2018-11-02 |
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