Ethylene carbonate-based ternary mixed solvent electrolytes for rechargeable lithium batteries

✍ Scribed by Shin-Ichi Tobishima; Katsuya Hayashi; Kei-Ichi Saito; Jun-Ichi Yamaki

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 746 KB
• Volume: 40
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(95)00004-x

✦ Synopsis

Lithium (Li) cycling efficiency by Li half cell tests and conductivity dependency on temperature are examined for LiAsF,-ethylene carbonate (EC)/2-methyltetrahydrofuran(2MeTHF)/third solvent (TS) ternary mixed solvent electrolytes, to obtain organic electrolyte systems with higher conductivity than EC/2MeTHF and with high Li cycling efficiency. The TSs used here are two chain-structured esters (methyl acetate and methyl formate), acetonitrile and five ethers, such as tetrahydrofuran (THF) and Cmethyl-1,3-dioxolane. Also, the electrolyte properties of nine Li-salts, such as LiPF, and LiTaF, , are examined in EC/2MeTHF as alternatives to LiAsF,. As a result, the EC/2MeTHF/THF ternary system is found to be a potential candidate with which to achieve the purpose of this work. It has a 1.5 times higher conductivity of 14.2mScm-' at 25°C and 5.7mScm-' at -20°C than EC/2MeTHF, and its Li cycling efliciency of 96.1% is closest to that of EC/2MeTHF (96.6%).