KR102142549B1 - 이차전지의 양극 형성용 조성물, 및 이를 이용하여 제조한 이차전지용 양극 및 이차전지 - Google Patents
이차전지의 양극 형성용 조성물, 및 이를 이용하여 제조한 이차전지용 양극 및 이차전지 Download PDFInfo
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- KR102142549B1 KR102142549B1 KR1020160037763A KR20160037763A KR102142549B1 KR 102142549 B1 KR102142549 B1 KR 102142549B1 KR 1020160037763 A KR1020160037763 A KR 1020160037763A KR 20160037763 A KR20160037763 A KR 20160037763A KR 102142549 B1 KR102142549 B1 KR 102142549B1
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Images
Classifications
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M4/62—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
-
- 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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- Y02E60/122—
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
도 1은 실시예 1, 2 및 비교예 1, 2에서의 양극 형성용 조성물을 이용하여 제조한 리튬 이차전지의 고온 저장 후 저항 증가율을 평가한 결과를 나타낸 그래프이다.
도 2는 실시예 1, 2 및 비교예 1에서 사용된 분산제의 전해액에 대한 스웰링 특성을 평가한 결과를 나타낸 그래프이다.
수소화 니트릴 고무 분산제 | |||||
AN1) (중량%) |
BD2) (중량%) |
HBD3 ) (중량%) |
RDB (중량%) |
Mw (x1000g/mol) |
|
실시예1 | 34 | 0.6 | 65.4 | 1 | 290 |
실시예2 | 33.6 | 11.6 | 54.8 | 17 | 290 |
비교예1 | 40.2 | 0.5 | 59.3 | 1 | 220 |
비교예2 | 37 | 9 | 54 | 14 | 220 |
바인더 | ||||
종류 | 관능기 종류 | 관능기 함량(몰%) | Mw (x1000g/mol) |
|
실시예1 | PVDF | 카르보닐기 | 0.5 | 900 |
실시예2 | PVDF | 카르보닐기 | 0.6 | 900 |
실시예3 | PVDF | 히드록시기 | 0.6 | 850 |
비교예1 | PVDF | 카르보닐기 | 0.3 | 900 |
비교예2 | PVDF | 카르보닐기 | 0.4 | 900 |
실시예 1 | 실시예 2 | 비교예 1 | 비교예 2 | |
질량 증가율(%) | 356 | 408 | 전해액에 용해 | 704 |
두께 증가율(%) | 124 | 146 | 전해액에 용해 | 두께 측정 불가 |
분산시 요구되는 믹싱 에너지 (Kwh/kg) |
입도D50(㎛) | |
실시예 1 | 20 | 0.59 |
비교예 1 | 28 | 0.77 |
비교예 2 | 21 | 0.75 |
접착력(gf) | |
실시예 1 | 20 |
실시예 2 | 30 |
비교예 1 | 14 |
비교예 2 | 18 |
Claims (12)
- 양극활물질, 도전재, 바인더, 분산제 및 분산매를 포함하며,
상기 바인더는 분자내 수소결합성 관능기를 0.5몰% 내지 1몰%로 포함하는 불소계 고분자를 포함하고,
상기 분산제는 하기 수학식 1에 따른 잔류 이중 결합 값이 1중량% 내지 20중량%이고, 분자내 α,β-불포화 니트릴 유래 구조의 반복단위의 함량이 20중량% 내지 35중량%인 수소화 니트릴 고무를 포함하는 것인 이차전지의 양극 형성용 조성물:
[수학식 1]
잔류 이중 결합(RDB)=BD%/(BD+HBD)x100
상기 수학식 1에서 BD는 수소화 니트릴 고무 내 공액디엔 유래 구조의 반복단위의 중량%를, HBD는 수소화된 공액디엔 유래 구조의 반복단위의 중량%를 각각 의미한다.
- 제1항에 있어서,
상기 수소결합성 관능기는 카르복시기, 히드록시기, 술폰산기, 카르보닐기, 에스테르기 및 글리시딜기로 이루어진 군에서 선택되는 어느 하나 또는 둘 이상을 포함하는 것인 이차전지의 양극 형성용 조성물.
- 제1항에 있어서,
상기 바인더는 수소결합성 관능기를 포함하는 불화비닐리덴의 호모폴리머인 것인 이차전지의 양극 형성용 조성물.
- 제1항에 있어서,
상기 바인더는 중량평균 분자량이 300,000g/mol 내지 1,000,000g/mol인 것인 이차전지의 양극 형성용 조성물.
- 제1항에 있어서,
상기 바인더는 양극활물질 100중량부에 대하여 1중량부 내지 30중량부로 포함되는 것인 이차전지의 양극 형성용 조성물.
- 제1항에 있어서,
상기 도전재는 카본블랙을 포함하는 것인 이차전지의 양극 형성용 조성물.
- 제6항에 있어서,
상기 카본블랙은 1차 입자가 응집되어 이루어진 2차 입자이며,
상기 1차 입자의 평균입경(D50)이 15nm 내지 25nm이고, 2차 입자의 BET 비표면적이 130m2/g 내지 380m2/g인 것인 이차전지의 양극 형성용 조성물.
- 제1항에 있어서,
상기 수소화 니트릴 고무는 중량평균 분자량이 100,000g/mol 내지 700,000g/mol인 것인 이차전지의 양극 형성용 조성물.
- 제1항에 있어서,
상기 분산제는 도전재 100중량부에 대하여 5중량부 내지 50중량부로 포함되는 것인 이차전지의 양극 형성용 조성물.
- 제1항 내지 제10항 중 어느 한 항에 따른 양극 형성용 조성물을 이용하여 제조된 이차전지용 양극.
- 제11항에 따른 양극을 포함하는 리튬 이차전지.
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