Ethyl Acetate가 첨가된 리튬염 유기전해질 특성 연구
Studies on Property of Li Salt-Organic Electrolytes Adding Ethyl Acetate
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초록
리튬이온 전지의 전해질 용액에 대한 연구는 높은 이온 전도도, 넓은 전위창등과 같은 요건을 만족 시키는 최적의 전해질을 찾는 연구가 진행되어 왔으며, 용매분해로 카본 전극 표면에 형성된 피막의 성질을 밝 히고자 하는 연구도 수행되어 왔다. 본 연구에서는 EC와 DEC혼합용매에 EA를 첨가하여 카본부극 표면에 형 성된 피막의 전기화학적 성질을 관찰하였다. 시간대 전압법, 순환 전압-전류법, 전자 현미경법, 임피던스법을 이용하여 관찰된 결과에 따르면, 제 3의 용매로 선택된 EA의 물성에 따라 혼합용매의 분해 전위 및 카본 부 극 표면에 형성된 피막의 전기화학적 성질이 달랐음을 확인하였다.
Abstract
The electrolytes of Li-ion batteries were studied to find the optimum electrolyte with high ionic conductivity, large electrochemical window, etc. And also the chemical and electrochemical properties of passivation film formed on the surface of carbon anode by solvent decomposition in Li-ion batteries were studied. In this work, ethyl acetate was added in the EC:DEC mixed solvent to improve the electrochemical properties of the passivation film and its characterization was investigated. According to the results of chronopotentiometry, cyclic voltammetry, a.c. impedance, and scanning electron microscopy, the electrochemical properties of the passivation film and decomposition voltage of the mixed electrolyte differed depending on the physical properties of the ethyl acetate selected as 3rd solvent.
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