Effect of ethylene carbonate concentration on the conductivity of carbonate-based electrolytes with LiPF6 for Li-ion batteries |
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Authors: | Sergey N. Shkerin Irina A. Profatilova Saeweon Roh |
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Affiliation: | (1) Corporate R&D Center, Samsung SDI Co. Ltd., 575, Shin-dong, Yeongtong-gu, Suwon, Gyeonggi-do, 443-731, Republic of Korea |
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Abstract: | A four-probe pouch-type cell was used to study the influence of carbonate-based electrolyte composition on the total conductivity of polyolefin separator impregnated with electrolyte through the electrochemical impedance spectroscopy. A frequency dispersion of separator with electrolyte is found to be dependent on the volume ratio of ethylene carbonate and ethyl methyl carbonate in an electrolyte solution. The origin of high- and low-frequency relaxation processes obtained from the impedance spectra is discussed. A correlation between the direct current resistance of separator with electrolyte and dissociation degree of electrolyte salt is found. |
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