KR20200042293A - 폴리도파민 전구체로부터 형성된 질소 도핑된 카본으로 둘러싸인 소듐이온전지용 양극 활물질 및 이의 제조방법 - Google Patents
폴리도파민 전구체로부터 형성된 질소 도핑된 카본으로 둘러싸인 소듐이온전지용 양극 활물질 및 이의 제조방법 Download PDFInfo
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- 229910001415 sodium ion Inorganic materials 0.000 title claims abstract description 78
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
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- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
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Abstract
Description
도 2는 본 발명에 따른 실시예 및 비교예의 열무게 측정 분석(Thermogravimetric analysis, TGA) 결과를 나타내는 그래프이다.
도 3은 본 발명에 따른 실시예의 X선 광전자 분광 분석(X-ray photo-electron spectroscopy, XPS) 결과를 나타내는 그래프이다.
도 4는 실시예 및 비교예의 전계 방사형-주사 전자현미경 분석(field-emission scanning electron microscopy, FE-SEM)을 나타낸 이미지와 비표면적 분석(Brunauer-Emmett-Teller, BET) 결과를 나타낸 그래프이다.
도 5a는 본 발명에 따른 실시예의 폴리도파민의 탄화 공정을 실시하기 전에 회수한 NVP의 투과 전자 현미경 분석(transmission electron microscopy, TEM) 결과를 나타낸 이미지이다.
도 5b는 본 발명에 따른 실시예의 폴리도파민의 탄화 공정을 실시하기 전에 회수한 NVP의 에너지 분산형 분광 분석(energy dispersive spectroscopy mapping, EDS mapping) 결과를 나타낸 이미지이다.
도 5c는 본 발명에 따른 실시예의 폴리도파민의 탄화 공정 이후 얻은 실시예의 투과 전자 현미경 분석 결과를 나타낸 이미지이다.
도 5d는 본 발명에 따른 실시예의 폴리도파민의 탄화 공정 이후 얻은 실시예의 에너지 분산형 분광 분석 결과를 나타낸 이미지이다.
도 6a는 0.5 C의 전류 밀도 하에서 본 본 발명에 따른 실시예 및 비교예의 장 수명/방전 사이클 평가 결과를 나타낸 그래프이다.
도 6b는 본 발명에 따른 실시예 및 비교예의 고율 특성 평가 결과를 나타낸 그래프이다.
도 6c는 본 발명에 따른 실시예 및 비교예의 고율 장 수명 충/방전 사이클 평가 결과를 나타낸 그래프이다.
도 7은 본 발명에 따른 실시예 및 비교예의 고온(60 ℃) 장 수명 충/방전 사이클 평가의 결과를 나타내는 그래프이다.
Claims (22)
- 나시콘계 화합물 입자; 및
상기 나시콘계 화합물 입자의 표면에 코팅된 질소 도핑된 다공성 카본 층;을 포함하는 소듐이온전지용 양극 활물질로서,
상기 질소 도핑된 다공성 카본 층은 폴리도파민을 탄화시켜 형성된 것인 소듐이온전지용 양극 활물질. - 제1항에 있어서,
상기 나시콘계 화합물은 Na3M2(PO4)3의 분자식을 가지는 화합물이고, 상기 M은 Ti, V, Cr, Mn 및 Fe로 이루어진 군으로부터 선택된 1종 이상인 것인 소듐이온전지용 양극 활물질. - 제1항에 있어서,
상기 질소 도핑된 다공성 카본 층의 두께는 10 내지 50 ㎚인 소듐이온전지용 양극 활물질. - 제1항에 있어서,
상기 질소 도핑된 다공성 카본 층은 직경이 1 내지 5 ㎚인 다수의 메조기공을 가지는 것인 소듐이온전지용 양극 활물질. - 제1항에 있어서,
상기 소듐이온전지용 양극 활물질은 30 내지 100 m2g-1의 표면적을 갖는 것인 소듐이온전지용 양극 활물질. - 제1항에 있어서,
상기 소듐이온전지 양극 활물질은 상기 카본을 5 내지 30 중량% 포함하는 것인 소듐이온전지용 양극 활물질. - 나시콘계 화합물 입자를 준비하는 단계;
상기 나시콘계 화합물 입자 및 도파민 전구체를 트리스 완충액(tris-buffer solution)에 투입하고 교반하여 상기 나시콘계 화합물 입자 표면에 자가 중합(self-polymerization)된 폴리도파민 층을 형성시키는 단계; 및
상기 폴리도파민 층을 열처리하여 질소가 도핑된 다공성 탄소 층을 형성시키는 단계;를 포함하는 소듐이온전지용 양극 활물질의 제조방법. - 제7항에 있어서,
상기 나시콘계 화합물은 Na3M2(PO4)3의 분자식을 가지는 화합물이고, 상기 M은 Ti, V, Cr, Mn 및 Fe로 이루어진 군으로부터 선택된 1종 이상인 것인 소듐이온전지용 양극 활물질의 제조방법. - 제7항에 있어서,
상기 나시콘계 화합물은 Na3V2(PO4)3이고,
상기 나시콘계 화합물 입자를 준비하는 단계는,
NH4VO3, CH3COONa, NH4H2PO4 및 시트르산(citric acid)을 50 내지 70 ℃의 증류수에 투입하고 교반하여 혼합액을 제조하는 단계;
상기 혼합액을 교반하는 중에 80 내지 100 ℃까지 승온하여 겔(gel)을 제조하는 단계;
상기 겔을 분말 형태로 분쇄하고 Ar 분위기 하에, 300 내지 400 ℃의 온도에서 3 내지 7시간동안 열처리하고 분말을 회수하는 단계; 및
상기 분말을 Ar 분위기 하에, 700 내지 900 ℃의 온도에서 5 내지 10시간동안 열처리하는 단계;를 포함하는 것인 소듐이온전지용 양극 활물질의 제조방법. - 제7항에 있어서,
상기 트리스 완충액의 pH는 8 내지 10인 소듐이온전지용 양극 활물질의 제조방법. - 제7항에 있어서,
상기 교반은 상온에서 15 내지 30 ℃의 온도에서 3 내지 10 시간 동안 초음파를 이용하여 이루어지는 것인 양극 활물질의 제조방법. - 제7항에 있어서,
상기 도파민 전구체는 dopamine hydrocholride, 3-hydroxytyramine hydrobromide, dopamine-1,1,2,2-d4 hydrochloride 및 N-Octanoyl dopamine으로 이루어진 군에서 선택된 1종 이상인 것인 소듐이온전지 양극 활물질의 제조방법. - 제7항에 있어서,
상기 폴리도파민 층의 두께는 30 내지 100 ㎚인 소듐이온전지용 양극 활물질의 제조방법. - 제7항에 있어서,
상기 열처리는 환원분위기에서 500 내지 1000 ℃의 온도 및 2 내지 12 시간 동안 이루어지는 것인 소듐이온전지 양극 활물질의 제조방법. - 제7항에 있어서,
상기 질소 도핑된 다공성 카본 층의 두께는 10 내지 50 ㎚인 소듐이온전지용 양극 활물질의 제조방법. - 제7항에 있어서,
상기 질소 도핑된 다공성 카본 층은 직경이 1 내지 5 ㎚인 다수의 메조기공을 가지는 것인 소듐이온전지용 양극 활물질의 제조방법. - 제7항에 있어서,
상기 소듐이온전지용 양극 활물질은 30 내지 100 m2g-1의 표면적을 갖는 것인 소듐이온전지용 양극 활물질의 제조방법. - 제7항에 있어서,
상기 소듐이온전지 양극 활물질은 상기 카본을 5 내지 30 중량% 포함하는 것인 소듐이온전지용 양극 활물질의 제조방법. - 제1항 내지 제6항의 소듐이온전지 양극 활물질을 포함하는 소듐이온전지 양극.
- 제18항의 소듐이온전지 양극을 포함하는 소듐이온전지.
- 제19항에 있어서,
상기 소듐이온전지는 25 ℃에서 20 C로 1000 사이클 충/방전 시험 후 방전 용량 유지율이 90 내지 97%인 것인 소듐이온전지. - 제19항에 있어서,
상기 소듐이온전지는 60 ℃에서 0.5 C로 500 사이클 충/방전 시험 후 방전 용량 유지율이 90 내지 95%인 것인 소듐이온전지.
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| CN114243001A (zh) * | 2021-10-29 | 2022-03-25 | 广东邦普循环科技有限公司 | 钠离子电池正极材料及其制备方法和应用 |
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