KR101556299B1 - 비정질 리튬전이금속 산화물 코팅층을 포함하는 리튬이차전지용 양극 및 그 제조방법 - Google Patents
비정질 리튬전이금속 산화물 코팅층을 포함하는 리튬이차전지용 양극 및 그 제조방법 Download PDFInfo
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- 239000011247 coating layer Substances 0.000 title claims abstract description 43
- 229910021437 lithium-transition metal oxide Inorganic materials 0.000 title claims abstract description 42
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 37
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- 239000006182 cathode active material Substances 0.000 claims abstract description 42
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- 229910013716 LiNi Inorganic materials 0.000 claims description 10
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- 229910001947 lithium oxide Inorganic materials 0.000 description 1
- VLXXBCXTUVRROQ-UHFFFAOYSA-N lithium;oxido-oxo-(oxomanganiooxy)manganese Chemical compound [Li+].[O-][Mn](=O)O[Mn]=O VLXXBCXTUVRROQ-UHFFFAOYSA-N 0.000 description 1
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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
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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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
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
본 발명에서 제조되는 리튬이차전지용 양극에 따르면, 양극 활물질층 위에 RF 스퍼터링법에 의하여 비정질 리튬전이금속 산화물 코팅층을 형성함으로써 전극의 전기전도도를 향상함과 동시에 불안정한 전해질로부터 보호막으로 작용하고, 고온 및 고전압에서도 안정성이 향상되며, 고에너지 및 고출력에서도 우수한 충/방전 싸이클 특성을 갖는 리튬이차전지를 제공할 수 있다.
Description
도 2(a)는 본 발명의 실시예에 따라 양극 활물질층 위에 비정질 리튬전이금속 산화물 코팅층이 형성된 양극의 단면, 도 2(b)는 본 발명의 비교예에 따라 비정질 리튬전이금속 산화물 코팅층이 형성되지 않은 양극의 단면을 측정한 주사전자현미경(SEM) 사진.
도 3은 본 발명의 실시예에 따라 형성되는 비정질 리튬전이금속 산화물 코팅층 표면의 결정구조를 나타낸 X선 회절(XRD) 그래프.
도 4는 본 발명의 비교예에 따라 비정질 리튬전이금속 산화물 코팅층이 형성되지 않은 양극 활물질층의 결정구조를 나타낸 X선 회절(XRD) 그래프.
도 5는 본 발명의 실시예 및 비교예로부터 제조된 리튬이차전지의 충/방전 싸이클 수에 따른 방전용량의 변화를 나타낸 그래프.
도 6은 본 발명의 실시예 및 비교예로부터 제조된 리튬이차전지의 열적 특성을 나타낸 시차주사열분석(DSC) 그래프.
Claims (15)
- 양극 활물질, 바인더 및 도전제를 함유하는 슬러리가 집전체 위에 도포되어 형성된 양극 활물질층; 및 상기 양극 활물질층 상에 증착된 비정질 리튬전이금속 산화물 코팅층;을 포함하는 리튬이차전지용 양극.
- 제1항에 있어서,
상기 양극 활물질은 LiCoO2, LiMn2O4, LiNiO2, LiNi1 -xCoxO2(0<X<1), Li-Ni-Mn계 복합 산화물, 및 Li-Ni-Mn-Co계 복합 산화물로 이루어진 군으로부터 선택된 어느 하나의 것을 특징으로 하는 리튬이차전지용 양극
- 제1항에 있어서,
상기 바인더는 폴리에틸렌, 폴리프로필렌, 폴리비닐알코올, 폴리비닐클로라이드, 스티렌-부타디엔 고무, 셀룰로오스계 고분자, 니트릴계 고분자, 및 불소계 고분자로 이루어진 군으로부터 선택된 어느 하나의 것을 특징으로 하는 리튬이차전지용 양극
- 제1항에 있어서,
상기 도전제는 도전성 탄소, 도전성 금속 또는 도전성 고분자인 것을 특징으로 하는 리튬이차전지용 양극
- 제 1항에 있어서,
상기 비정질 리튬전이금속 산화물은 하기 일반식 1로 표시되는 것을 특징으로 하는 리튬이차전지용 양극
<일반식 1>
Lix-Mn2-y-My-Oz (0.9≤x≤1.2, 0.35≤y≤0.85, 3.8≤z≤4.2)
(식 중, M은 Ni, Cu, Cr, Co, Fe, Ti, V, Zn, 및 Mo으로 이루어진 군으로부터 선택된 1종 이상의 것이다)
- 제1항 내지 제5항 중 어느 한 항에 따른 리튬이차전지용 양극;
음극 활물질을 함유하는 음극;
분리막; 및
비수 전해질을 포함하는 리튬이차전지
- i) 양극 활물질, 바인더 및 도전제를 유기용매에 분산시켜 슬러리를 얻는 단계;
ii) 상기 슬러리를 집전체 위에 도포 및 건조하여 양극 활물질층을 형성하는 단계; 및
iii) 상기 양극 활물질층 위에 RF 스퍼터링법에 의하여 비정질 리튬전이금속 산화물 코팅층을 증착하는 단계;를 포함하는 리튬이차전지용 양극의 제조방법
- 제7항에 있어서,
상기 i) 단계의 양극 활물질은 LiCoO2, LiMn2O4, LiNiO2, LiNi1 -xCoxO2(0<X<1), Li-Ni-Mn계 복합 산화물, 및 Li-Ni-Mn-Co계 복합 산화물로 이루어진 군으로부터 선택된 어느 하나의 것을 특징으로 하는 리튬이차전지용 양극의 제조방법
- 제7항에 있어서,
상기 i) 단계의 바인더는 폴리에틸렌, 폴리프로필렌, 폴리비닐알코올, 폴리비닐클로라이드, 스티렌-부타디엔 고무, 셀룰로오스계 고분자, 니트릴계 고분자, 및 불소계 고분자로 이루어진 군으로부터 선택된 어느 하나의 것을 특징으로 하는 리튬이차전지용 양극의 제조방법
- 제7항에 있어서,
상기 i) 단계의 도전제는 도전성 탄소, 도전성 금속 또는 도전성 고분자인 것을 특징으로 하는 리튬이차전지용 양극의 제조방법
- 제7항에 있어서,
상기 i) 단계의 유기용매는 물, 메탄올, 에탄올, 프로판올, 이소프로판올, N-메틸피롤리돈, 및 이들의 혼합물로 이루어진 군으로부터 선택된 어느 하나의 것을 특징으로 하는 리튬이차전지용 양극의 제조방법
- 제7항에 있어서,
상기 ii) 단계의 집전체는 알루미늄 호일인 것을 특징으로 하는 리튬이차전지용 양극의 제조방법
- 제7항에 있어서,
상기 iii) 단계의 RF 스퍼터링법은 50~200 W의 마이크로파, 아르곤 가스 80~100 sccm 및 산소 기체 5~25 sccm를 투입하여 30~40분 동안 증착하는 것을 특징으로 하는 리튬이차전지용 양극의 제조방법
- 제7항에 있어서,
상기 iii) 단계의 비정질 리튬전이금속 산화물은 하기 일반식 1로 표시되는 것임을 특징으로 하는 리튬이차전지용 양극의 제조방법
<일반식 1>
Lix-Mn2-y-My-Oz (0.9≤x≤1.2, 0.35≤y≤0.85, 3.8≤z≤4.2)
(식 중, M은 Ni, Cu, Cr, Co, Fe, Ti, V, Zn, 및 Mo으로 이루어진 군으로부터 선택된 1종 이상의 것이다)
- 제7항에 있어서,
상기 iii) 단계의 비정질 리튬전이금속 산화물 코팅층은 그 두께가 150 내지 200 nm인 것을 특징으로 하는 리튬이차전지용 양극의 제조방법
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US11329290B2 (en) | 2017-12-01 | 2022-05-10 | Lg Energy Solution, Ltd. | Electrode assembly and secondary lithium battery including the same |
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US11329290B2 (en) | 2017-12-01 | 2022-05-10 | Lg Energy Solution, Ltd. | Electrode assembly and secondary lithium battery including the same |
US12224444B2 (en) | 2017-12-01 | 2025-02-11 | Lg Energy Solution, Ltd. | Electrode assembly and secondary lithium battery including the same |
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