NONAQUEOUS ELECTROLYTE SOLUTION, SEMISOLID ELECTROLYTE LAYER, SHEET FOR SECONDARY BATTERY AND SECONDARY BATTERY

• Main Authors: UNEMOTO ATSUSHI, DOTSUKO KAORU, UENO KAZUHIDE, WATANABE MASAYOSHI
• Format: Patent
• Language: English; Japanese
• Published: 10.09.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a nonaqueous electrolyte solution which can improve the input and output characteristics of a secondary battery, especially the high-temperature service life and rate characteristic.SOLUTION: A nonaqueous electrolyte solution according to the present invention comprises: a solvated ionic liquid having sulfolane and/or a derivative thereof and an electrolytic salt; an appropriate low-viscosity organic solvent; and an appropriate negative electrode interface stabilizing material. The equilibrium vapor pressure of the low-viscosity organic solvent at a room temperature is 1 Pa or higher. When the rate of a mole number of the solvation ionic liquid to a total mole number of the solvation ionic liquid and the low-viscosity organic solvent is X, and the rate of a weight of the negative electrode interface stabilizing material to a total weight of the solvation ionic liquid and the low-viscosity organic solvent is Y(%), the following relation is satisfied: Y≤142.86X-11.429.SELECTED DRAWING: Figure 2 【課題】二次電池の入出力特性を向上させることができ、特に、高温における寿命及びレート特性を向上させることが可能な非水電解液を提供することを目的とする。【解決手段】本発明の非水電解液は、スルホラン及び／又はその誘導体と電解質塩とを有する溶媒和イオン液体、任意の低粘度有機溶媒、並びに任意の負極界面安定化材を含み、前記低粘度有機溶媒の室温での平衡蒸気圧が１Ｐａ以上であり、前記溶媒和イオン液体と前記低粘度有機溶媒との総モル数に対する前記溶媒和イオン液体のモル数の比をＸとし、前記溶媒和イオン液体と前記低粘度有機溶媒との総重量に対する前記負極界面安定化材の重量の比をＹ（％）としたとき、Ｙ≦１４２．８６Ｘ−１１．４２９を満たすことを特徴とする。【選択図】図２