| 摘要 |
PURPOSE:To enhance a preserving characteristic and a cycle characteristic of a secondary battery by using a specific compound as a solute of an electrolyte. CONSTITUTION:At least one kind of compounds expressed by Formula I is used as a solute for a non-aqueous electrolyte of a battery comprising a negative electrode 1 made of lithium active material, a positive electrode 7 and a separator 8. Since an anion included in the compound is excellent in ion stability and effective in restraining a decomposition reaction of the electrolyte, an increase in inside impedance due to preservation can be restrained, thus enhancing a preserving characteristic and a cycle characteristic of a secondary battery. In Formula I, X represents one kind selected from a group of C, N, P and Si; Y, one kind selected from a group of S, P and N; R, one selected from an alkyl group, an aryl group or substitution products thereof (except for products where all hydrogen atoms to be substituted are fluorine atoms); and (n) and (m), each an integer 2 or more. |
