리튬 이차전지용 고체전해질 개발 동향
Research Trend of Solid Electrolyte for Lithium Rechargeable Batteries
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초록
최근 리튬이차전지는 높은 에너지 밀도와 고용량화되어 급속도로 발전하고 있다. 그 중에서도 친환경 수송 장치의 전기자동차가 주목 받고 있는데 이를 위해서는 리튬이차전지의 많은 성능개선이요구된다. 현재 리튬이차전지는 ‘하이브리드 전기자동차 (Hybrid Electric Vehicle, HEV)’에 실제적용되고 있으며 이를 위해서 높은 용량, 긴 수명, 그리고 안전성 확보가 반드시 필요하다. 하지만현재 리튬이차전지에서 리튬이온의 이동을 위해 사용하는 유기전해액의 과열 및 과충전 상태에서폭발의 위험성을 가지고 있기에 높은 안전성을 가진 고체전해질로의 대체가 시급하다. 따라서 본연구에서는 리튬이차전지의 안정성 및 성능 개선을 위한 고체전해질의 연구 동향과 출원된 특허및 논문에 대하여 논의하고자 한다.
Abstract
Recently lithium ion secondary batteries (LIB) have rapidly developed because of their advantages such as high energy densities and capacities. Among them, an electrical vehicle which is the one of the environmental-friendly transportation facilities has been received a great attention, but, it is needed to overcome several obstacles of the LIB performances. LIB is practically adapted to Hybrid Electric Vehicle (HEV), but the issues for high capacities, long life time and safety should be solved. Moreover, LIBs still have some possibilities of explosion in the case of overheating of the used organic electrolyte and overcharging of the cell. Hence, it is urgently needed to replace the liquid electrolytes into the solid electrolytes due to the safety issues. Therefore, in this review, we summarized and discussed the research trends of the solid electrolyte to solve the concerns of safety and capacity of LIBs and published patents and articles.
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