Abstract: Provided is a non-aqueous electrolytic solution for a lithium ion secondary cell that uses an additive that can suppress gas generation due to the decomposition of the non-aqueous electrolytic solution and has a low environmental risk.

Abstract: A method of producing a lithium ion secondary battery includes preparing an electrode body which includes a positive electrode and a negative electrode and in which the negative electrode contains a negative electrode material containing a porous graphite particle having open pores and SiO2 disposed in the open pores, producing a battery assembly including the electrode body and a non-aqueous electrolytic solution containing LiPF6 with a concentration of 1 mol/L or more, and generating lithium difluorophosphate in the electrode body

Abstract: Provided is a nonaqueous electrolyte that can provide a secondary battery with both excellent initial output characteristics and excellent high-temperature storage characteristics. A nonaqueous electrolyte disclosed here includes an electrolyte salt, a nonaqueous solvent, and a compound represented by following Chemical Formula (I): where each of R1 and R2 independently represents a trifluoromethyl group, a secondary alkyl group having 3 to 6 carbon atoms, or a tertiary alkyl group having 4 to 6 carbon atoms.

Abstract: A method of producing a lithium ion secondary battery disclosed here, includes a process of preparing an electrode body which includes a positive electrode and a negative electrode and in which the negative electrode contains a negative electrode material containing graphite having open pores and SiO2 disposed in the open pores; a process of producing a battery assembly including the electrode body and a non-aqueous electrolytic solution containing LiPF6 with a concentration of 1 mol/L or more; a process of initially charging the battery assembly; and a process of performing an aging treatment on the initially charged battery assembly in an environment of a temperature of 50° C. or higher.

Abstract: A battery is provided. The battery includes an electrode having a flat shape. The electrode is wound and includes a through hole. The through hole is further provided in a wound-back portion of the electrode.

Abstract: The disclosure provides an electrolyte solution that enables a lithium ion secondary battery to have reduced initial resistance, a small increase in resistance at high-temperature cycles, and reduced gas generation at high temperature. The electrolyte solution for a lithium ion secondary battery contains lithium difluorophosphate, an oxalic acid ion, and a compound (1) represented by the following formula (1): wherein R1 and R2 are each independently a methyl group, an ethyl group, a propyl group, or a butyl group.

Abstract: Provided is a non-aqueous electrolyte solution that achieves a favorable balance between suppressing an increase in resistance and improving metallic Li precipitation resistance in an embodiment that contains LiPO2F2. The non-aqueous electrolyte solution disclosed here is used in a non-aqueous electrolyte secondary battery, and contains lithium difluorophosphate and a Cs cation-containing compound. When the total amount of the non-aqueous electrolyte solution is taken to be 100 mass %, the content of the lithium difluorophosphate is 1.0 mass % or less and the content of the Cs cation-containing compound is 0.1 to 0.5 mass %.

Abstract: Provided is a nonaqueous electrolyte solution to which lithium tetraborate is added, for a lithium secondary battery, the nonaqueous electrolyte solution being capable of reducing the resistance of a lithium secondary battery. A nonaqueous electrolyte solution for a lithium secondary battery disclosed herein contains lithium tetraborate as a first additive, and a difluorophosphate salt as a second additive.

Abstract: A battery includes at least an electrode array and an electrolyte solution. The electrolyte solution contains at least a solvent and a supporting salt. The electrode array includes at least a positive electrode, a porous insulating layer, and a negative electrode. The porous insulating layer is interposed between the positive electrode and the negative electrode. The porous insulating layer contains at least a group of inorganic nanoparticles and a group of polymer particles. Each inorganic nanoparticle in the group of inorganic nanoparticles is a dielectric. Each inorganic nanoparticle in the group of inorganic nanoparticles is in contact with the electrolyte solution.

Abstract: Provided is an electrolyte solution for lithium secondary batteries that allows lowering the resistance of a lithium secondary battery, and suppressing characteristic degradation of the lithium secondary battery under high temperature. The electrolyte solution for lithium secondary batteries disclosed herein contains 0.05 mass % to 2.0 mass % of a compound represented by Formula (1) below. (In the formula, M+ represents a quaternary ammonium cation or a nitrogen-containing heteroaromatic ring cation, and R1 represents a C1-C5 alkyl group in which an ether oxygen is optionally inserted.

Abstract: A negative electrode which includes graphite particles and which is capable of imparting superior input resistance characteristics to a nonaqueous lithium-ion secondary battery is provided. The negative electrode of a nonaqueous lithium-ion secondary battery disclosed herein includes graphite particles as negative electrode active materials and a supported material being supported by the graphite particles. The graphite particles have phenolic hydroxy groups. The supported material has surface hydroxy groups. A ratio of an amount B (mmol/g) of the surface hydroxy groups in the supported material to an amount A (mmol/g) of the phenolic hydroxy groups in the graphite particles is 30 or more and 150 or less.

Abstract: A manufacturing method of a negative electrode of a lithium-ion secondary battery, includes: preparing a negative electrode paste containing a negative electrode active material and a binder; and producing the negative electrode using the negative electrode paste. A ratio of a zeta potential of the binder to a zeta potential of the negative electrode active material is 3.5 or more and 9.0 or less.

Abstract: A method of producing a lithium ion secondary battery disclosed here, includes a process of preparing an electrode body which includes a positive electrode and a negative electrode and in which the negative electrode contains a negative electrode material containing graphite having open pores and SiO2 disposed in the open pores; a process of producing a battery assembly including the electrode body and a non-aqueous electrolytic solution containing LiPF6 with a concentration of 1 mol/L or more; a process of initially charging the battery assembly; and a process of performing an aging treatment on the initially charged battery assembly in an environment of a temperature of 50° C. or higher.

Abstract: Provided is a non-aqueous electrolytic solution for a lithium ion secondary cell that can reduce the initial resistance of the lithium ion secondary cell and can suppress the increase in resistance when the lithium ion secondary cell is allowed to stand at high temperature. The non-aqueous electrolytic solution for a lithium ion secondary cell disclosed herein includes a light metal salt represented by the following formula (I) and a silyl sulfate compound represented by the following formula (II). The content of the light metal salt in the non-aqueous electrolytic solution for a lithium ion secondary cell is 0.1% by mass or more and 1.5% by mass or less. The content of the silyl sulfate compound in the non-aqueous electrolytic solution for a lithium ion secondary cell is 0.1% by mass or more and 5.0% by mass or less (each symbol in the formulas is as defined in the specification).

Abstract: A non-aqueous electrolyte disclosed herein contains a difluorophosphate represented by the following formula (I) with 0.5% by mass or more and an organic sulfate ester salt represented by the following formula (II) with 0.1% by mass or more. M+ in the following formula (I) represents an alkali metal ion. M+ in the following formula (II) is a quaternary ammonium cation or a nitrogen-containing heteroaromatic ring cation, and R is an alkyl group having one to five carbon atoms in which an ether oxygen is optionally inserted.

Abstract: A non-aqueous electrolyte disclosed herein contains a difluorophosphate represented by the following formula (I) with 0.5% by mass or more and a silyl sulfate compound represented by the following formula (II) with 0.1% by mass or more. M+ in the following formula (I) represents an alkali metal ion. R1 to R6 in the following formula (II) are independent of each other and each represent an alkyl group that has 1 to 4 carbon atoms and that is optionally substituted with a fluorine atom, an alkenyl group that has 2 to 4 carbon atoms and that is optionally substituted with a fluorine atom, an alkyl group having 2 to 4 carbon atoms, in which an oxygen atom is inserted between a carbon-carbon bond, or an alkenyl group having 3 to 4 carbon atoms, in which an oxygen atom is inserted between a carbon-carbon bond.

Abstract: The present disclosure provides a nonaqueous electrolyte solution that is used in a nonaqueous electrolyte secondary battery. The nonaqueous electrolyte solution contains a fluorinated solvent, a predetermined additive A and a predetermined additive B. A ratio (CA/CB) of concentration CA (mol/L) of the additive A and concentration CB (mol/L) of the additive B lies in a range of 1 to 30.

Abstract: A nonaqueous electrolyte solution used for a nonaqueous electrolyte secondary battery includes a cyclic carbonate and a fluorinated carboxylate ester including two fluorine atoms on an alpha carbon atom derived from a carboxylic acid as a nonaqueous solvent.

Abstract: The present invention provides an electrolyte solution in which a decrease in capacity retention is suppressed and an increase in gas production is suppressed even when stored at high temperatures. Provided is an electrolyte solution containing: a compound (1) represented by formula (1): CF3CFX11COOR11, wherein X11 is a hydrogen atom, a fluorine atom, or a C1-C3 alkyl group in which hydrogen atoms are optionally replaced by fluorine atoms, and R11 is a C1-C3 alkyl group in which hydrogen atoms are optionally replaced by fluorine atoms; a fluorinated carbonate; and a cyclic acid anhydride.

Abstract: Provided is an electrolyte solution for a lithium secondary battery, which can lower the resistance of a lithium secondary battery and impart the lithium secondary battery with high cycle characteristics. The electrolyte solution for a lithium secondary battery disclosed here includes an electrolyte salt consisting essentially of a lithium imide salt, a solvent containing methyl difluoroacetate, and an unsaturated carboxylic acid anhydride compound represented by formula (1) below as an additive (in the formula, R1 and R2 each independently denote a hydrogen atom, a fluorine atom, or an alkyl group that may be fluorine-substituted, or R1 and R2 bond to each other to form a ring structure).