Ethylene carbonate—propylene carbonate mixed electrolytes for lithium batteries |
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Authors: | Shin-Ichi Tobishima Akihiko Yamaji |
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Affiliation: | Ibaraki Electrical Communication Laboratory, Nippon Telegraph and Telephone Public Corporation, Tokai, Ibaraki-ken, 319-11, Japan |
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Abstract: | Electrolytic characteristics of propylene carbonate (PC)ethylene carbonate (EC) mixed electrolytes were studied, compared with those in PC electrolytes. Conductivity and Li charge—discharge efficiency values increased with EC contents increasing. For example, 1 M LiClO4ECPC (EC mixing molar ratio; EC]/PC] = 4) showed the conductivity of 8.5 ohm?1 cm?1, which value was 40% higher than that in PC. Also, 1 M LiClO4ECPC(EC]/PC] = 5) showed the Li charge—discharge efficiency of 90.5% at 0.5 mA cm?2, 0.6 C cm?2, which value was ca. 25% higher than that in PC. ECPC mixed electrolytes were considered to be practically available for ambient lithium batteries in regard to the high Li+ ion conductivity and also high Li charge—discharge efficiency. |
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