Non-aqueous electrolytic solutions and non-aqueous electrolyte cells comprising the same

Abstract

Abstract A non-aqueous electrolytic solutions which has self-distinguishing property, low reactivity to metal lithium and high withstand voltage is provided. The non-aqueous electrolytic solutions of the first invention comprise, as electrolyte, lithium salt preferably LiPF6 and, as solvent, phosphoric acid esters of the following general formula [1]; <IMAGE> [1] wherein R1, R2 and R3, which may be the same or different, represent an alkyl group or an alkyl group substituted by one or more halogen atoms and at least one of R1, R2, and R3 represents an alkyl group substituted by one or more halogen atoms. The non-aqueous electrolytic solutions of the second invention comprise, as solvents for electrolyte, trimethyl phosphate, one or more linear carbonates represented by the following general formula [3]; <IMAGE> [3] (wherein R6 represents methyl or ethyl group and R7 represents a linear or branched alkyl group having 1 to 3 carbon atoms) and one or more cyclic carbonates and, as electrolyte, LiPF6; wherein content of the trymetyl phosphate is 1 to 10% by volume of the solvents for electrolyte. The non-aqueous electrolytic solution is suitable for a cell using carbon material capable of being doped and dedoped with lithium ions as a negative electrode active material and complexed oxide of lithium and a transition metal as a positive electrode active material.

Inventors

• 👤 Keiichi Yokoyama
• 👤 Shigeru Fujita
• 👤 Akio Hiwara
• 👤 Yoshiaki Naruse
• 👤 Masahiro Toriida
• 👤 Atsuo Omaru

Bibliographic Details