Carbonate compounds, non-aqueous electrolytic solutions and batteries comprising non-aqueous electrolytic solutions

A non-aqueous electrolytic solution comprising a carbonate compound represented by the formula (II):

• R.sup.3 -O-CO-O-R.sup.4 (II)
• wherein R.sup.3 represents an alkyl group having 1 to 5 carbon atoms or an alkyl group having 1 to 5 carbon atoms substituted by one or more halogen atoms, and R.sup.4 represents an alkyl group having 5 to 8 carbon atoms and having no hydrogen atom at the .beta.-position thereof or an alkyl group having 2 to 5 carbon atoms substituted by one or more halogen atoms and having no hydrogen atom at the .beta.-position thereof.

A non-aqueous electrolytic solution comprising an electrolyte and a carbonate compound represented by the formula (II)

• R.sup.3 -O-CO-O-R.sup.4 (II)
• wherein R.sup.3 is a member selected form the group consisting of --CH.sub.3, CH.sub.2 CH.sub.3 and --CH.sub.2 CF.sub.3 and R.sup.4 is a member selected from the group consisting of --CH.sub.2 C(CH.sub.3).sub.3 --CH.sub.2 CF.sub.3, --CH.sub.2 CF.sub.2 CF.sub.3, --CH.sub.2 CF.sub.2 CF.sub.2 H and --CH(CF.sub.3).sub.2, and
• the electrolyte is a member selected from the group of lithium compounds consisting of LiPF.sub.6, LiPF.sub.4, LiClO.sub.4, LAsF.sub.6, LiCF.sub.3 SO.sub.3, LiAlCl.sub.4, LiN(SO.sub.2 CF.sub.3).sub.2, LiCF.sub.4 F.sub.9 SO.sub.3 AND LiC.sub.8 F.sub.17 SO.sub.3.