KR20110126418A - 화학가교고분자전해질을 이용하여 표면 개질된 양극 활물질 및 이를 포함하는 리튬이차전지 - Google Patents
화학가교고분자전해질을 이용하여 표면 개질된 양극 활물질 및 이를 포함하는 리튬이차전지 Download PDFInfo
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- KR20110126418A KR20110126418A KR1020100046085A KR20100046085A KR20110126418A KR 20110126418 A KR20110126418 A KR 20110126418A KR 1020100046085 A KR1020100046085 A KR 1020100046085A KR 20100046085 A KR20100046085 A KR 20100046085A KR 20110126418 A KR20110126418 A KR 20110126418A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
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- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Description
도 2는, 본 발명의 실시예 2에서 양극 활물질 표면개질을 위해 사용한 TMPETA의 화학구조를 도시한 도면이다.
도 3(a)는 비교예 1에 따른 표면개질 이전 양극 활물질의 전자현미경(FE-SEM) 사진이고, 도 3(b)는 실시예 1에 따른 폴리이미드로 표면개질된 양극 활물질의 전자현미경(FE-SEM) 사진이다.
도 4는, 비교예 1 및 실시예 1에서 제조한 전지의 충방전 사이클을 나타낸 그래프이다.
도 5는, 비교예 1 및 실시예 1에서 제조한 전지의 시차주사열량계(Differential Scanning Calorimetry, DSC) 분석에 의한 양극-전해액 발열 반응 결과를 나타낸 그래프와 표이다.
도 6(a)는 비교예 1에 따른 표면개질 이전 양극 활물질의 전자현미경(FE-SEM) 사진이고, 도 6(b)는 실시예 2에 따른 TMPETA로 표면개질된 양극 활물질의 전자현미경(FE-SEM) 사진이다.
도 7은, 비교예 1 및 실시예 2에서 제조한 전지의 충방전 사이클을 나타낸 그래프이다.
도 8은, 비교예 1 및 실시예 2에서 제조한 전지의 시차주사열량계(Differential Scanning Calorimetry, DSC) 분석에 의한 양극-전해액 발열 반응 결과를 나타낸 그래프와 표이다.
Claims (19)
- 리튬이차전지용 양극 활물질로서,
상기 양극 활물질은 그 표면에, 화학적으로 가교(chemical crosslinking)된 리튬 이온 이동이 가능한 고분자가 코팅되어 있는 것을 특징으로 하는 양극 활물질. - 제1항에 있어서,
상기 고분자는 이미드(imide), 아크릴레이트(acrylate), 우레탄(urethane), 우레아(urea), 에테르(ether), 에스테르(ester), 아미드(amide), 술폭사이드(sulfoxide) 및 에폭시(epoxy)로 이루어진 관능기 중 하나 이상을 포함하는 고분자인 것을 특징으로 하는 양극 활물질. - 제1항에 있어서,
상기 고분자는 폴리이미드 또는 폴리아크릴레이트인 것을 특징으로 하는 양극 활물질. - 제3항에 있어서,
상기 폴리아크릴레이트는 폴리(트리아크릴레이트)인 것을 특징으로 하는 양극 활물질. - 제3항에 있어서,
상기 폴리아크릴레이트는 폴리(트리메틸로프로판 에톡실레이트 트리아크릴레이트) (poly(trimethylopropane ethoxylate triacrylate))인 것을 특징으로 하는 양극 활물질. - 제1항에 있어서,
상기 양극 활물질은 i) LiCoO2; ii) LiCo1 /3Mn1 /3Ni1 /3O2; iii) LiNiO2; iv) LiFePO4; v) LiMn2O4; 및 vi) V2O5, TiS, MoS 또는 이들의 조합과 리튬이 결합된 리튬 인터칼레이션 물질(lithium intercalation materials)로 이루어진 군으로부터 선택되는 1종 이상인 것을 특징으로 하는 양극 활물질. - 제1항에 있어서,
상기 코팅의 두께가 0.00001 - 5 ㎛ 범위인 것을 특징으로 하는 양극 활물질. - 제1항에 있어서,
상기 코팅은 도전재를 추가로 포함하는 것을 특징으로 하는 양극 활물질. - 제8항에 있어서,
상기 도전재는 카본블랙 및 케첸블랙으로 이루어진 군으로부터 선택되는 1종 이상인 것을 특징으로 하는 양극 활물질. - 1) 양극 활물질의 표면에, 리튬 이온 이동이 가능한 고분자의 코팅층을 도입하는 단계; 및
2) 상기 코팅층을 화학적으로 가교시키는 단계
를 포함하는 리튬이차전지용 양극 활물질의 제조 방법. - 제10항에 있어서,
상기 단계 1)의 코팅층을 도입하는 단계는, 물, 알코올, 아세톤, 테트라하이드로퓨란, 시클로헥산, 사염화탄소, 클로로포름, 메틸렌클로라이드, 디메틸포름아마이드, 디메틸아세트아마이드, 디메틸술폭사이드 및 N-메틸피롤리돈으로 이루어진 군에서 선택되는 1종 이상의 용매에 고분자를 용해시켜 고분자 용액을 제조하는 단계, 및 상기 고분자 용액으로부터 용매를 제거하는 단계로 이루어진 것을 특징으로 하는 방법. - 제11항에 있어서,
상기 고분자 용액에 도전재를 추가로 혼합하는 것을 특징으로 하는 방법. - 제10항에 있어서,
상기 단계 2)의 화학적 가교는 열 가교 (thermal crosslinking) 또는 자외선 가교 (UV crosslinking)를 통해 수행되는 것을 특징으로 하는 방법. - 제10항에 있어서,
상기 고분자는 폴리아믹산 또는 아크릴레이트 함유 모노머인 것을 특징으로 하는 방법. - 제14항에 있어서,
상기 아크릴레이트 함유 모노머는 트리아크릴레이트(tri-acrylate) 함유 모노머인 것을 특징으로 하는 방법. - 제14항에 있어서,
상기 아크릴레이트 함유 모노머는 트리메틸로프로판 에톡실레이트 트리아크릴레이트 (trimethylopropane ethoxylate triacrylate)인 것을 특징으로 하는 방법. - 제10항에 있어서,
상기 단계 2)의 가교에 의해 양극 활물질의 표면에, 폴리이미드 또는 폴리아크릴레이트의 코팅층이 생성되는 것을 특징으로 하는 방법. - 제10항에 있어서,
상기 양극 활물질은 i) LiCoO2; ii) LiCo1/3Mn1/3Ni1/3O2; iii) LiNiO2; iv) LiFePO4; v) LiMn2O4; 및 vi) V2O5, TiS, MoS 또는 이들의 조합과 리튬이 결합된 리튬 인터칼레이션 물질(lithium intercalation materials)로 이루어진 군으로부터 선택되는 1종 이상인 것을 특징으로 하는 방법. - 양극, 음극 및 전해질을 포함하는 리튬 이차 전지에 있어서,
상기 양극이 제1항 내지 제9항 중 어느 한 항에 따른 양극 활물질을 포함하는 것을 특징으로 하는 리튬 이차 전지.
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