Abstract: The present invention provides a nonaqueous electrolytic solution capable of suppressing worsening of heat stability of a negative electrode and improving safety of an energy storage device while maintaining high-load charging and discharging cycle properties at a high temperature, an energy storage device using the same, and a phosphonoformic acid compound to be used for the same. The nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent contains 0.001 to 5% by mass of at least one selected from a phosphonoformic acid compound having at least one carbon-carbon unsaturated bond, which is represented by the following general formula (I), and a phosphonoformic acid compound having a carbon-carbon unsaturated bond or two phosphonocarbonyl groups, which is represented by the following general formula (II).

Abstract: A nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, containing a compound of formula (X): where R10 and R20 are each a group selected from an alkyl having 1 to 8 carbon atoms, an alkenyl having 2 to 6 carbon atoms, an alkynyl having 3 to 6 carbon atoms, and an aryl having 6 to 12 carbon atoms, or a lithium; and X is a polar group (i) containing a —C(?O), a —P(?O), or an —S(?O)2 group, a polar group (ii) containing a —CN or an alkyl group having 1 to 6 carbon atoms, in which a part of hydrogen atoms is substituted with a fluorine atom, or a 4- to 7-membered ring polar group (iii) containing a —C(?O)—O— or a —C(?O)—N— group, where when X is a 4- to 7-membered ring polar group (iii) containing —C(?O)—N—, at least one of R10 and R20 is lithium.

Abstract: The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics in a broad temperature range and an energy storage device using the same. [1] A nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing, as an additive, an SO4 group-containing compound having a specified structure and [2] an energy storage device including a positive electrode, a negative electrode, and a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, wherein the nonaqueous electrolytic solution contains, as an additive, 0.001% by mass or more and less than 5% by mass of an SO4 group-containing compound having a specified structure in the nonaqueous electrolytic solution, are disclosed.

Abstract: The present invention is concerned with a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a compound represented by the following general formula (X), in which a polar group (X) is bound to a phosphorus atom (P), and capable of improving electrochemical characteristics in a broad temperature range; an energy storage device using the same; and a novel compound.

Abstract: Provided are a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing 0.01 to 4% by mass of a compound represented by the following general formula (I), and an energy storage device including the nonaqueous electrolytic solution: wherein R1 and R2 each independently represent a methyl group, an ethyl group, or a fluoroethyl group. The nonaqueous electrolytic solution and the energy storage device have improved high-temperature storage property and low-temperature cycle property.

Abstract: The present invention includes [1] a nonaqueous electrolytic solution of an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing from 0.001 to 5% by mass of a specified acyclic lithium salt in the nonaqueous electrolytic solution and being capable of improving electrochemical characteristics in a broad temperature range; and [2] an energy storage device including a positive electrode, a negative electrode, and a nonaqueous electrolytic solution of an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing from 0.001 to 5% by mass of a specified acyclic lithium salt in the nonaqueous electrolytic solution.

Abstract: The present invention provides a nonaqueous electrolytic solution capable of suppressing worsening of heat stability of a negative electrode and improving safety of an energy storage device while maintaining high-load charging and discharging cycle properties at a high temperature, an energy storage device using the same, and a phosphonoformic acid compound to be used for the same. The nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent contains 0.001 to 5% by mass of at least one selected from a phosphonoformic acid compound having at least one carbon-carbon unsaturated bond, which is represented by the following general formula (I), and a phosphonoformic acid compound having a carbon-carbon unsaturated bond or two phosphonocarbonyl groups, which is represented by the following general formula (II).

Abstract: The present invention is to provide a nonaqueous electrolytic solution prepared by dissolving an electrolyte salt in a nonaqueous solvent, wherein the nonaqueous solvent includes 0.01 to 40% by volume of an ester having two alkyl groups at the ?-position carbon of the carbonyl group and being represented by the following general formula (I), and an energy storage device. (in the above formula, R1 is an alkyl group, an alkenyl group or an alkynyl group in which at least one of the hydrogen atoms may be substituted with a halogen atom, R2 and R3 are an alkyl group in which at least one of the hydrogen atoms may be substituted with a halogen atom, and R2 and R3 may be linked to each other to form a ring. However, when R2 and R3 do not form a ring, R3 is an alkyl group in which at least one of the hydrogen atoms may be substituted with a halogen atom.).

Abstract: The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics in a broad temperature range and an energy storage device using the same. [1] A nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing, as an additive, an SO4 group-containing compound having a specified structure and [2] an energy storage device including a positive electrode, a negative electrode, and a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, wherein the nonaqueous electrolytic solution contains, as an additive, 0.001% by mass or more and less than 5% by mass of an SO4 group-containing compound having a specified structure in the nonaqueous electrolytic solution, are disclosed.

Abstract: An object of the present invention is to provide a nonaqueous electrolytic solution capable of improving low-temperature load characteristics after high temperature charging storage, an electrochemical element using it, and a 1,2-dioxypropane compound used for it. The nonaqueous electrolytic solution of the present invention comprises an electrolyte salt dissolved in a nonaqueous solvent, and contains a 1,2-dioxypropane compound represented by the above-mentioned general formula (I). (wherein R1 and R2 each represent a hydrogen atom, or an alkyl group having from 1 to 6 carbon atoms; X1 represents a group selected from —S(?O)—, —S(?O)2—, —C(?O)—, —CR3R4—, —P(?O)(OR5)— and —SiR6R7—; R3 and R4 each represent a hydrogen atom, or an alkyl group having from 1 to 6 carbon atoms; R5 to R7 each represent an alkyl group having from 1 to 6 carbon atoms.

Abstract: Provided are a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous solvent including a cyclic carbonate and a linear carbonate under the following condition 1 or 2, and the nonaqueous electrolytic solution containing from 0.001 to 5% by mass of vinylsulfonyl fluoride, and an energy storage device using the same. Condition 1: The linear carbonate includes both a symmetric linear carbonate and an asymmetric linear carbonate, and the proportion of the asymmetric linear carbonate occupying in the linear carbonate is from 51 to 95% by volume. Condition 2: The cyclic carbonate includes ethylene carbonate and propylene carbonate, and the linear carbonate includes a symmetric linear carbonate.

Abstract: The present invention includes [1] a nonaqueous electrolytic solution of an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing from 0.001 to 5% by mass of a specified acyclic lithium salt in the nonaqueous electrolytic solution and being capable of improving electrochemical characteristics in a broad temperature range; and [2] an energy storage device including a positive electrode, a negative electrode, and a nonaqueous electrolytic solution of an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing from 0.001 to 5% by mass of a specified acyclic lithium salt in the nonaqueous electrolytic solution.

Abstract: The present invention is to provide a nonaqueous electrolytic solution prepared by dissolving an electrolyte salt in a nonaqueous solvent, wherein the nonaqueous solvent includes 0.01 to 40% by volume of an ester having two alkyl groups at the ?-position carbon of the carbonyl group and being represented by the following general formula (I), and an energy storage device. (in the above formula, R1 is an alkyl group, an alkenyl group or an alkynyl group in which at least one of the hydrogen atoms may be substituted with a halogen atom, R2 and R3 are an alkyl group in which at least one of the hydrogen atoms may be substituted with a halogen atom, and R2 and R3 may be linked to each other to form a ring. However, when R2 and R3 do not form a ring, R3 is an alkyl group in which at least one of the hydrogen atoms may be substituted with a halogen atom.

Abstract: An object of the present invention is to provide a nonaqueous electrolytic solution capable of improving low-temperature load characteristics after high temperature charging storage, an electrochemical element using it, and a 1,2-dioxypropane compound used for it. The nonaqueous electrolytic solution of the present invention comprises an electrolyte salt dissolved in a nonaqueous solvent, and contains a 1,2-dioxypropane compound represented by the above-mentioned general formula (I). (wherein R1 and R2 each represent a hydrogen atom, or an alkyl group having from 1 to 6 carbon atoms; X1 represents a group selected from —S(?O)—, —S(?O)2—, —C(?O)—, —CR3R4—, —P(?O)(OR5)— and —SiR6R7—; R3 and R4 each represent a hydrogen atom, or an alkyl group having from 1 to 6 carbon atoms; R5 to R7 each represent an alkyl group having from 1 to 6 carbon atoms.

Abstract: The present invention is a method for producing an aromatic compound by substituting the sulfonic acid group in a sulfonic acid aromatic-ester with a hydrogen atom in the presence of a platinum group metal catalyst, wherein an alkali metal carboxylate and/or an ammonium formate are made to coexist in the system. According to the present invention, an aromatic compound where the sulfonic acid group in a sulfonic acid aromatic-ester is substituted with a hydrogen atom, can be produced efficiently with good operability without using metal magnesium.

Abstract: The present invention is a method for producing an aromatic compound by substituting the sulfonic acid group in a sulfonic acid aromatic-ester with a hydrogen atom in the presence of a platinum group metal catalyst, wherein an alkali metal carboxylate and/or an ammonium formate are made to coexist in the system. According to the present invention, an aromatic compound where the sulfonic acid group in a sulfonic acid aromatic-ester is substituted with a hydrogen atom, can be produced efficiently with good operability without using metal magnesium.