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NTIS 바로가기전기화학회지 = Journal of the Korean Electrochemical Society, v.13 no.1, 2010년, pp.19 - 33
The surface film, which is formed on graphite negative electrodes during the initial charging, is a key component in lithium secondary batteries. The battery reactions are strongly affected by the nature of the surface film. It is thus very important to understand the physicochemical properties of t...
핵심어 | 질문 | 논문에서 추출한 답변 |
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리튬이차전지란? | 리튬이차전지란 리튬의 산화·환원반응을 전극반응으로 이용하여에너지를 저장 및방출할 수있는 디바이스이다.1)충전 과정에서는 양극(LiCoO2 등의 전이금속 산화물)이 산화되며 탈리된 리튬 이온이 음극(흑연 등의 탄소재료)에서 환원되어 삽입되며 외부로부터의 전기에너지를 화학에너지의 형태로 저장하고, 방전 과정에서는 음극이 산화되며 탈리된 리튬 이온이 양극에서 환원되어 삽입되며 화학에너지가 전기에너지로 변환되어 방출된다. | |
흑연 음극에서 리튬 이온의 삽입, 탈리 반응은 어느 영역에서 진행되는가? | 이와 같은 전해질의 분해 반응을 리튬 이차전지의 음극재로서 널리 사용되고 있는 흑연을 예로 들어 생각해보도록 한다. 흑연 음극에서는 리튬 이온의 삽입(intercalation)·탈리(de-intercalation) 반응이 0.0~0.25 V(vs. Li/Li+) 영역에서 진행하는데,3-6) 이것은 열역학적으로 매우 강한 환원 분위기이기 때문에 이 영역에서 전해질이 안정하게 존재하는 것은 기대하기 어렵다. | |
리튬이차전지의 충전, 방전과정에 대해 설명하라. | 리튬이차전지란 리튬의 산화·환원반응을 전극반응으로 이용하여에너지를 저장 및방출할 수있는 디바이스이다.1)충전 과정에서는 양극(LiCoO2 등의 전이금속 산화물)이 산화되며 탈리된 리튬 이온이 음극(흑연 등의 탄소재료)에서 환원되어 삽입되며 외부로부터의 전기에너지를 화학에너지의 형태로 저장하고, 방전 과정에서는 음극이 산화되며 탈리된 리튬 이온이 양극에서 환원되어 삽입되며 화학에너지가 전기에너지로 변환되어 방출된다.2) 이런 원리로 작동하는 리튬 이차전지의 큰 특징 중 하나는 에너지 밀도가 높다는 것인데 그 이유는 음극 반응에 있다고 해도 과언이 아니다. |
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