Dialkoxyethane—propylene carbonate mixed electrolytes for lithium secondary batteries

✍ Scribed by Shin-Ichi Tobishima; Jun-Ichi Yamaki; Akihiko Yamaji; Takeshi Okada

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 881 KB
• Volume: 13
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(84)80034-8

✦ Synopsis

The electrolytic characteristics of various 1,2_dialkoxyethane (DAE)propylene carbonate (PC) mixed solvent electrolytes for Li secondary batteries have been examined. DAE[HsC(CH2),0C2H40(CH2),CHs] is a low viscous, non-cyclic, aprotic solvent. As DAEs, dimethoxyethane (DME), diethoxyethane (DEE), and dibutoxyethane (DBE) were used. The conductivities of PC/DME and of PC/DEE showed maximum values around PC/ DAE volume ratios of l/l and at 1M solute, due mainly to the high dielectric constant of PC and the low viscosity of DAE. The Li+ ion conductivity changed according to the DAE molecular volume. 1M LiAsF,-PC/DME (l/l) showed an approximately 2.6 times higher conductivity, 13.8 X lop3 ohm-' cm-', than PC alone. Lithium charge-discharge efficiency on the Li substrate increased with decreasing reactivity between Li and DAE, which would be expected from the oxidation potential for DAE, LiClO,-PC/DME and PC/DEE showed a greater than 90% Li cycling efficiency.