KR101293269B1 - 과충전에 대한 안전성이 우수한 리튬 이차전지용 전해질 및 이를 포함하는 리튬 이차전지 - Google Patents
과충전에 대한 안전성이 우수한 리튬 이차전지용 전해질 및 이를 포함하는 리튬 이차전지 Download PDFInfo
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- KR101293269B1 KR101293269B1 KR1020100003920A KR20100003920A KR101293269B1 KR 101293269 B1 KR101293269 B1 KR 101293269B1 KR 1020100003920 A KR1020100003920 A KR 1020100003920A KR 20100003920 A KR20100003920 A KR 20100003920A KR 101293269 B1 KR101293269 B1 KR 101293269B1
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- Prior art keywords
- electrolyte
- lithium secondary
- secondary battery
- lithium
- substituted aromatic
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
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- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
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Abstract
Description
도 2는 본 발명의 실험예 1에서 실시예 2의 전지에 대한 결과를 나타낸 그래프이다;
도 3은 본 발명의 실험예 1에서 비교예 1의 전지에 대한 결과를 나타낸 그래프이다;
도 4는 본 발명의 실험예 1에서 비교예 2의 전지에 대한 결과를 나타낸 그래프이다;
도 5는 본 발명의 실험예 1에서 비교예 3의 전지에 대한 결과를 나타낸 그래프이다.
Claims (8)
- 카보네이트 화합물의 전해액에 리튬염이 용해되어 있는 리튬 이차전지용 전해질로서, 과충전에 대한 안전성을 향상시킬 수 있도록 4.5 내지 5.0 V의 산화전위를 가진 불소(fluoro)-치환 방향족 화합물이 포함되어 있고, 상기 불소-치환 방향족 화합물은 2,5-difluoro 톨루엔 및 3,4-difluoro 톨루엔으로 이루어진 군에서 선택되는 하나 이상이며, 상기 불소-치환 방향족 화합물의 함량은 전해액 전체 중량을 기준으로 0.05 ~ 10 중량%인 것을 특징으로 하는 리튬 이차전지용 전해질.
- 삭제
- 제 1 항에 있어서, 상기 불소-치환 방향족 화합물의 함량은 전해액 전체 중량을 기준으로 0.1 ~ 5 중량%인 것을 특징으로 하는 리튬 이차전지용 전해질.
- 제 1 항에 있어서, 상기 전해질은 크실렌(xylene)을 더 포함하는 있는 것을 특징으로 하는 리튬 이차전지용 전해질.
- 제 4 항에 있어서, 상기 크실렌은 m-크실렌, o-크실렌 및 p-크실렌으로 이루어진 군에서 선택되는 하나 이상인 것을 특징으로 하는 리튬 이차전지용 전해질.
- 제 4 항에 있어서, 불소-치환 방향족 화합물을 기준으로 상기 크실렌의 함량비는 몰비로 0.1 내지 0.6의 범위인 것을 특징으로 하는 리튬 이차전지용 전해질.
- 제 1 항에 있어서, 상기 카보네이트 화합물의 전해액은 선형 카보네이트 화합물과 환형 카보네이트 화합물의 혼합물인 것을 특징으로 하는 리튬 이차전지용 전해질.
- 제 1 항 및 제 3 항 내지 제 7 항 중 어느 하나에 따른 리튬 이차전지용 전해질이 양극/분리막/음극 구조의 전극조립체에 함침되어 있는 것을 특징으로 하는 리튬 이차전지.
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