Additive effects of Li+ ion solvation compounds on LiClO4-propylene carbonate electrolytic properties

✍ Scribed by Shin-Ichi Tobishima; Akihiko Yamaji

• Book ID: 103897958
• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 403 KB
• Volume: 12
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(84)80013-0

✦ Synopsis

The additive effects of cation solvation compounds (CSC) on the Li+ ionic conductivity and also on the Li charge-discharge characteristics for 1M LiCIOe-propylene carbonate (PC) were examined. Ethylenediamine (EDA), N,N,N',N'-t.&ramethyl-EDA (TMEDA) and n-ethylene glycol dimethylethers (n-glymes) were used as the CSCs. The equivalent molar conductivity (A) values for TMEDA and added solutions of the n-glymes were 60 -80% higher than that in the absence of a solution addition. EDA addition, however, had no effect. The A enhancement on TMEDA addition was a result of not only an increase in the degree of ionic dissociation of the solute, but also of the relatively easy Li+ ion migration due to the smaller practical ion radius resulting from the TMEDA-Li+ complex.

The Li charge-discharge efficiency increased by about 15% on addition of TMEDA solution. This is assumed to be due to the protecting effect of TMEDA or the TMEDA-Li+ complex on the electron transfer reaction between PC and the deposited Li.