Abstract: Disclosed herein is a non-aqueous electrolyte secondary battery containing at least a positive electrode capable of the absorbing and releasing of a lithium ion, a negative electrode capable of the absorbing and releasing of the lithium ion, and a non-aqueous electrolyte solution containing a non-aqueous solvent and an electrolyte dissolved in the non-aqueous solvent, where the negative electrode contains a carbonaceous material, and the non-aqueous electrolyte solution contains, in addition to an electrolyte and a non-aqueous solvent: (A) a compound having at least two isocyanate groups per molecule, (B) a monofluorophosphate salt or a difluorophosphate salt, at from 0.001 mass % or more to 5 mass % or less in the non-aqueous electrolyte solution.

Abstract: Disclosed herein is a non-aqueous electrolyte solution containing, in addition to an electrolyte and a non-aqueous solvent, (A) a compound having at least two isocyanate groups per molecule, and (B) LiN(FSO2)2.

Abstract: The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics in the case of using an energy storage device at a high temperature and at a high voltage and further capable of inhibiting the gas generation while maintaining a capacity retention rate after storage at a high temperature and at a high voltage and also provides an energy storage device using the same. Disclosed is a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a carboxylic acid ester compound represented by the following general formula (I). In the formula, each of R1 and R2 independently represents a hydrogen atom, a —C(?O)—OR4 group, or the like, and R1 and R2 may be bonded to each other to form a ring structure. R3 represents a hydrogen atom or the like, and n represents an integer of 1 to 3.

Abstract: The nonaqueous electrolytic solution secondary battery includes a nonaqueous electrolytic solution, a negative electrode containing Si atoms, and a positive electrode. The solution contains a nonaqueous solvent, a compound represented by the Formula (1), and an unsaturated bond-containing carbonate; the content of the compound with respect to the whole solution is 0.07 wt % to 15.0 wt %; the content of the carbonate with respect to the whole solution is 0.2 wt % to 8.0 wt %; and, in the negative electrode, the ratio of an active substance (A) containing SiOx (0.5?x?1.6) with respect to all active substances is 9.0 wt % or lower: wherein, R1 to R3 independently represent a hydrogen atom, or a hydrocarbon group having 1 to 10 carbon atoms which optionally has a halogen atom; at least one of R1 to R3 is a halogen atom-containing alkyl group having 1 to 10 carbon atoms; and n represents 0 or 1.

Abstract: Disclosed is a non-aqueous electrolytic solution for an energy storage device, including a non-aqueous solvent, an electrolyte salt, a first additive consisting of a sulfolane compound represented by the following formula (1), and a second additive which is at least one selected from the group consisting of a cyclic sulfuric ester compound represented by the following formula (2a) and a dinitrile compound represented by the following formula (2b):