Abstract
리튬 이온 전지에서 높은 이온전도도, 넓은 전위창 등과 같은 요건을 만족시키는 최적의 전해질을 찾는 연구를 수행하였다. 이와 함께 초기 충전 중에 카본 부극 표면에 형성된 피막의 성질이 사용된 용매에 따라 어떻게 변화되는지에 대한 연구를 수행하였다. 카본 부극 표면에 형성된 피막의 전기화학적 성질이 전해액의 혼합 용매비에 따라 변화되는 경향을 관찰하였고 그 원인을 규명하였다. 전자현미경법, 시간대 전압법, 순화 전압 전류법, 임피던스법을 이용하여 관찰된 결과에 따르면, 혼합 용매의 이온 전도도에 따라 혼합 용매분해 전위 및 카본 부극 표면에 형성된 피막의 전기화학적 성질이 달랐다. We have studied to find the optimum electrolyte that satisfied high ionic conductivity, large elec-trochemical window, etc in Li-ion battery. And also studied were the effect of a passive film on carbon anode surface,which is formed by solvent decomposition during the initial charge process. Electrochemical properties of the passive film formed on carbon anode surface investigated and explained as the volumetric ratio of the mixed solvents. The results of scanning electron microscopy, chronopotentiometry, cyclic voltammetry, impedance spectroscopy revealed that the electrochemical properties of the passive film were varied with the ionic conductivity of the electrolyte including the mixed solvents.
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