申请人:SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
公开号:US10991984B2
公开(公告)日:2021-04-27
A nonaqueous electrolyte of the present invention includes an ionic liquid including a first alicyclic quaternary ammonium cation having one or more substituents, a second alicyclic quaternary ammonium cation having an alicyclic skeleton that is the same as an alicyclic skeleton of the first alicyclic quaternary ammonium cation, and a counter anion to the first alicyclic quaternary ammonium cation and the second alicyclic quaternary ammonium cation and an alkali metal salt. In the second alicyclic quaternary ammonium cation, one of substituents bonded to a nitrogen atom in the alicyclic skeleton is a substituent including a halogen element. In the ionic liquid, the amount of a salt including the second alicyclic quaternary ammonium cation is less than or equal to 1 wt % per unit weight of the ionic liquid, or is less than or equal to 0.8 wt % per unit weight of the nonaqueous electrolyte.
本发明的非水电解质包括一种离子液体,其中包括具有一个或多个取代基的第一脂环族季铵阳离子、第二脂环季铵阳离子,其脂环骨架与第一脂环季铵阳离子的脂环骨架相同,以及第一脂环季铵阳离子和第二脂环季铵阳离子的反阴离子和碱金属盐。在第二脂环族季铵阳离子中,与脂环族骨架中的氮原子键合的取代基之一是包括卤素元素的取代基。在离子液体中,包括第二脂环季铵阳离子的盐的量小于或等于离子液体单位重量的 1 wt %,或小于或等于非水电解质单位重量的 0.8 wt %。