Abstract: The present invention provides a lithium ion secondary cell excellent in high-temperature storage characteristics and high voltage cycle characteristics; and a nonaqueous electrolyte for the cell.

Abstract: A method for manufacturing a phosphate, which includes reacting, in a solvent, an organophosphate represented by the following formula (2) and an alkali metal hydroxide in an amount of 1.01 mole equivalents or more relative to the organophosphate to provide a composition containing a phosphate represented by the following formula (1), the alkali metal hydroxide, and the solvent; and adding hydrogen fluoride to the composition to neutralize the composition and to precipitate an alkali metal fluoride, thereby providing a composition containing the precipitated alkali metal fluoride, the phosphate represented by the formula (1), and the solvent. The formula (1) is (R11O)(R12O)PO2M, where R11, R12 and M are as defined herein. The formula (2) is (R21O)(R22O)(R23O)PO, where R21, R22, and R23 are as defined herein.

Abstract: An electrolyte solution whose residual capacity is less likely to decrease and whose percentage increase in resistance is less likely to change even after stored at high temperature. The electrolyte solution contains a compound (1) represented by the following formula (1): R11CFX11(CH2)n11COOR12 wherein R11 is H, F, a C1-C3 non-fluorinated alkyl group, or a C1-C3 fluorinated alkyl group; X11 is H or F; R12 is a C1-C3 non-fluorinated alkyl group or a C1-C3 fluorinated alkyl group; and n11 is an integer of 0 to 3; a fluorinated carbonate; and a specific additive.

Abstract: An electrolyte solution containing a compound represented by the following formula (1): wherein Rf is a C1-C8 fluorinated alkyl group, and vinylene carbonate. Also disclosed is an electrochemical device including the electrolyte solution, a lithium ion secondary battery including the electrolyte solution and a module including the lithium ion secondary battery.

Abstract: An electrolyte solution applicable to high-voltage electrochemical devices and capable of improving the cycle characteristics of electrochemical devices even at high voltage. The electrolyte solution contains a fluorinated acyclic carbonate and a metal salt having a specific structure. The fluorinated acyclic carbonate is represented by CF3—OCOO—R11 (wherein R11 is a C1 or C2 non-fluorinated alkyl group or a C1 or C2 fluorinated alkyl group) or CFH2—OCOO—R12 (wherein R12 is a C1 or C2 non-fluorinated alkyl group or a C1 or C2 fluorinated alkyl group).

Abstract: An electrolyte solution applicable to high-voltage electrochemical devices and capable of improving the cycle characteristics of electrochemical devices even at high voltage, and an electrochemical device. The electrolyte solution contains a fluorinated diether and a metal salt having a specific structure. The fluorinated diether is represented by CFR11R12—O—CH2CH2—O—R13, wherein R11 and R12 are each individually H, CH3, F, CH2F, CHF2, or CF3; and R13 is a C1 or C2 non-fluorinated alkyl group or a C1 or C2 fluorinated alkyl group.

Abstract: The present invention provides a novel electrolyte solution capable of providing electrochemical devices whose internal resistance is less likely to increase even after repeated charge and discharge and whose cycle capacity retention ratio is high. The electrolyte solution of the present invention contains a solvent, an electrolyte salt, and at least one selected from the group consisting of compounds represented by R11X11—SO3M11 and compounds represented by R21R22N—SO3M21 in an amount of 0.001 to 10 mass % relative to the solvent.

Abstract: An electrolyte solution for an electrochemical device, such as a lithium secondary battery, or module. The electrolyte solution contains: a solvent that contains a fluorinated acyclic carbonate having a fluorine content of 33 to 70 mass %; at least one organosilicon compound selected from a compound represented by the formula (1): (R11)n11—M11—O—SiR12R13R14 and a compound represented by the formula (2): R21R22R23—Si—F; a lithium salt (3) that contains an oxalato-complex as an anion; and a lithium salt (4) represented by the formula (4): LizM31FxOy, where R11, M11, R12, R13, R14, R21, R22, R23 and M31 are as defined herein.

Abstract: An electrolyte solution capable of providing electrochemical devices whose internal resistance is less likely to increase even after repeated charge and discharge and whose cycle capacity retention ratio is high. The electrolyte solution contains a solvent, an electrolyte salt, and a phosphate in an amount of 0.001 to 15 mass % relative to the solvent and represented by the formula (1): (R11O)(R12O)PO2M, where R11, R12 and M are as defined herein.

Abstract: An electrolyte solution capable of providing electrochemical devices whose internal resistance is less likely to increase even after repeated charge and discharge and whose cycle capacity retention ratio is high. The electrolyte solution contains a solvent, an electrolyte salt, and at least one selected from the group consisting of compounds represented by R11X11—SO3M11 and compounds represented by R21R22N—SO3M21 in an amount of 0.001 to 10 mass % relative to the solvent.

Abstract: The present invention provides an electrolyte solution that is capable of dealing with an increased voltage of an electrochemical device, as well as capable of improving the high-temperature storage characteristics and cycle characteristics of the electrochemical device, and an electrochemical device. The electrolyte solution includes a solvent containing a fluorinated saturated cyclic carbonate and a fluorinated acyclic carbonate; at least one sulfur-containing compound selected from the group consisting of compounds having a —SO2— bond, compounds having a —SO3— bond, and compounds having a —SO4— bond, and an electrolyte salt. The fluorinated acyclic carbonate has a fluorine content of 31.0 to 70.0 mass %.

Abstract: An electrolyte solution for an electrochemical device, such as a lithium secondary battery, or module. The electrolyte solution contains a solvent; an electrolyte salt; at least one compound (X) selected from a compound represented by R11X11—SO3M11 and a compound represented by R21R22N—SO3M21; and at least one organosilicon compound selected from a compound represented by (R31)n31-M31-O—SiR32R33R34 and a compound represented by R41R42R43—Si—F, where R11, X11, M11, R21, R22, M21, R41, R42 and R43 are as defined herein.

Abstract: An electrolyte solution containing a compound represented by the following formula (1): wherein Rf is a C1-C8 fluorinated alkyl group, and vinylene carbonate. Also disclosed is an electrochemical device including the electrolyte solution, a lithium ion secondary battery including the electrolyte solution and a module including the lithium ion secondary battery.

Abstract: The present invention provides an electrolyte solution that is capable of dealing with an increased voltage of an electrochemical device, improving the high-temperature storage characteristics, and restraining an increase in resistance, and an electrochemical device. The electrolyte solution includes a solvent containing a fluorinated acyclic carbonate having a fluorine content of 33 to 70 mass %, a borate, and an electrolyte salt other than the borate.

Abstract: An unsaturated cyclic carbonate containing a fluorinated alkyl group represented by the following formula: wherein Rf is a C1-C8 fluorinated alkyl group.

Abstract: The present invention provides an electrolytic solution capable of providing an electrochemical device, such as a lithium ion secondary battery, or a module that has excellent high-temperature storage performance. The electrolytic solution contains: a homocyclic compound other than aromatic compounds; and a cyclic dicarbonyl compound. The homocyclic compound contains at least one group selected from the group consisting of a nitrile group and an isocyanate group.

Abstract: A method for manufacturing a phosphate, which includes reacting, in a solvent, an organophosphate represented by the following formula (2) and an alkali metal hydroxide in an amount of 1.01 mole equivalents or more relative to the organophosphate to provide a composition containing a phosphate represented by the following formula (1), the alkali metal hydroxide, and the solvent; and adding hydrogen fluoride to the composition to neutralize the composition and to precipitate an alkali metal fluoride, thereby providing a composition containing the precipitated alkali metal fluoride, the phosphate represented by the formula (1), and the solvent. The formula (1) is (R11O)(R12O)PO2M, where R11, R12 and M are as defined herein. The formula (2) is (R21O)(R22O)(R23O)PO, where R21, R22, and R23 are as defined herein.

Abstract: An unsaturated cyclic carbonate containing a fluorinated alkyl group represented by the following formula: wherein Rf is a C1-C8 fluorinated alkyl group.

Abstract: The present invention provides an electrolytic solution capable of providing an electrochemical device (e.g., a lithium ion secondary battery) or a module that is less likely to generate gas even in high-temperature storage and has high capacity retention even after high-temperature storage. The present invention relates to an electrolytic solution which may contain a compound represented by Y21R21C—CY22R22 wherein R21 and R22 may be the same as or different from each other, and are each H, an alkyl group, or a halogenated alkyl group; Y21 and Y22 may be the same as or different from each other, and are each —OR23 or a halogen atom; and R23 is H, an alkyl group, or a halogenated alkyl group.

Abstract: An object of the present invention is to provide a lithium cell exhibiting a high remaining capacity after high-temperature storage even if used at high voltages, and an electrolytic solution used for the cell. The present invention relates to an electrolytic solution containing a nonaqueous solvent; an electrolyte salt; and 10 vol % or more of a compound represented by the following formula (1) based on 100 vol % of the nonaqueous solvent, wherein R1, R2 and R3 may be the same as or different from one another, each representing a hydrogen atom, a fluorine atom, a C1-C20 alkyl group, or a C1-C20 fluorinated alkyl group, excluding cases where all of R1, R2, and R3 are hydrogen atoms or fluorine atoms.