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 nonaqueous electrolyte for use in a lithium-ion secondary battery, capable of reducing gas generation due to degradation of nonaqueous electrolyte, is provided. The nonaqueous electrolyte disclosed herein is for use in a lithium-ion secondary battery wherein a negative electrode active material in a negative electrode includes at least one of a Si-based negative electrode active material including Si as a component and capable of reversibly absorbing and releasing lithium ions or a graphite-based carbon negative electrode active material. The nonaqueous electrolyte contains a nonaqueous solvent and an electrolyte dissolved in the nonaqueous solvent, and further contains a cyclic carbonate and a high-molecular-weight organic compound having a weight-average molecular weight of 1000 or higher.

Abstract: The present disclosure provides a negative electrode for use in a lithium-ion secondary battery capable of protecting the negative electrode from breakage and cracks due to expansion and contraction of an Si-based negative electrode active material. The negative electrode is for use in a lithium-ion secondary battery and includes a negative electrode current collector and a negative electrode active material layer formed on the negative electrode current collector. The negative electrode active material layer contains, as a negative electrode active material, an Si-based negative electrode active material including Si as a component and capable of reversibly absorbing and releasing lithium ions. The negative electrode further includes a high-molecular-weight organic compound for improving durability of the lithium-ion secondary battery. The high-molecular-weight organic compound has a weight-average molecular weight of 1000 or higher.

Abstract: The power storage device includes an electrode body and an exterior body made of a laminate film that houses the electrode body. The laminate film has a barrier layer which is a metal layer, and a sealing layer laminated on a surface of the barrier layer facing the electrode body. In the barrier layer, a through hole that penetrates the barrier layer in the thickness direction is formed. The diameter of the through hole is 3 mm or more and 10 mm or less. The laminate film further includes a resin portion disposed in the through hole.

Abstract: Provided is a technique for suppressing the formation of black regions in a wound electrode body. The production method disclosed herein is a method for producing a non-aqueous electrolyte secondary battery that includes a wound electrode body, a non-aqueous electrolyte, and a battery case. This production method includes the following steps: an assembling step S1 of placing the wound electrode body and the non-aqueous electrolyte in the battery case to construct a secondary battery assembly; a first step S2 of performing initial charging on the secondary battery assembly; and a second step S3 of setting the temperature of the wound electrode body to 50° C. or lower and keeping this state for at least 72 hours after the first step.

Abstract: A non-aqueous electrolyte secondary battery which uses a non-aqueous electrolyte solution in which a main component of a non-aqueous solvent is a fluorinated solvent, and by which it is possible to suitably prevent a decrease in battery capacity. A method for producing the non-aqueous electrolyte solution disclosed here includes a fluorinated solvent provision step for preparing the fluorinated solvent, a highly polar solvent provision step for preparing a highly polar solvent having a relative dielectric constant of 40 or more, a LiBOB dissolution step for preparing a highly concentrated LiBOB solution by dissolving LiBOB in the highly polar solvent at a concentration that exceeds the saturation concentration in the fluorinated solvent, and a mixing step for mixing the fluorinated solvent with the highly concentrated LiBOB solution.

Abstract: Provided is a technique for suppressing the formation of black regions in a wound electrode body. The production method disclosed herein is a method for producing a non-aqueous electrolyte secondary battery that includes a wound electrode body, a non-aqueous electrolyte, and a battery case. This production method includes the following steps: an assembling step S1 of placing the wound electrode body and the non-aqueous electrolyte in the battery case to construct a secondary battery assembly; a first step S2 of performing initial charging on the secondary battery assembly; and a second step S3 of setting the temperature of the wound electrode body to 50° C. or lower and keeping this state for at least 72 hours after the first step.

Abstract: Provided is a technique for suppressing the formation of highly resistive regions in a wound electrode body. The production method disclosed herein includes a flat-shaped wound electrode body in which a belt-shaped positive electrode plate and a belt-shaped negative electrode plate are wound, with a belt-shaped separator being intervened therebetween, a non-aqueous electrolyte, and a battery case. The positive electrode plate contains a lithium-transition metal composite oxide containing manganese. This production method includes an assembling step S1 of placing the wound electrode body and the non-aqueous electrolyte in the battery case to construct a secondary battery assembly; a first charging step S2 of performing initial charging on the secondary battery assembly such that the battery voltage reaches 3.1 V to 3.7 V; and a discharging step S3 of discharging the secondary battery assembly after the first charging step.

Abstract: A non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and an electrolyte solution. The negative electrode includes a negative electrode composite material layer. The negative electrode composite material layer includes a negative electrode active material and a carbon nanotube. The electrolyte solution includes a solvent, a supporting electrolyte, and a cationic surfactant. The cationic surfactant includes a quaternary ammonium salt.

Abstract: A non-aqueous electrolyte secondary battery which uses a non-aqueous electrolyte solution in which a main component of a non-aqueous solvent is a fluorinated solvent, and by which it is possible to suitably prevent a decrease in battery capacity. A method for producing the non-aqueous electrolyte solution disclosed here includes a fluorinated solvent provision step for preparing the fluorinated solvent, a highly polar solvent provision step for preparing a highly polar solvent having a relative dielectric constant of 40 or more, a LiBOB dissolution step for preparing a highly concentrated LiBOB solution by dissolving LiBOB in the highly polar solvent at a concentration that exceeds the saturation concentration in the fluorinated solvent, and a mixing step for mixing the fluorinated solvent with the highly concentrated LiBOB solution.

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 secondary battery which uses a non-aqueous electrolyte solution in which a main component of a non-aqueous solvent is a fluorinated solvent, and by which it is possible to suitably prevent a decrease in battery capacity. A method for producing the non-aqueous electrolyte solution disclosed here includes a fluorinated solvent provision step for preparing the fluorinated solvent, a highly polar solvent provision step for preparing a highly polar solvent having a relative dielectric constant of 40 or more, a LiBOB dissolution step for preparing a highly concentrated LiBOB solution by dissolving LiBOB in the highly polar solvent at a concentration that exceeds the saturation concentration in the fluorinated solvent, and a mixing step for mixing the fluorinated solvent with the highly concentrated LiBOB solution.

Abstract: A nonaqueous electrolytic solution is a nonaqueous electrolytic solution for a lithium secondary battery, the lithium secondary battery including a positive electrode that includes a positive electrode active material, and a negative electrode that includes a negative electrode active material which is a carbonaceous material storing and releasing a lithium ion. The nonaqueous electrolytic solution includes: one or more anions selected from an oxalato borate anion and an oxalato phosphate anion; and one or more arylamine compounds. The nonaqueous electrolytic solution is present between the positive electrode and the negative electrode and conducts a lithium ion.

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. The non-aqueous electrolytic solution for a lithium ion secondary cell disclosed herein includes an electrolyte salt including a fluorine atom, a non-aqueous solvent capable of dissolving the electrolyte salt, and at least one heteroaromatic dicarboxylic acid anhydride selected from the group consisting of a compound represented by a following formula (I) and a compound represented by a following formula (II) as an additive (wherein, R1 to R7 are as defined in the specification).

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 secondary battery which uses a non-aqueous electrolyte solution in which a main component of a non-aqueous solvent is a fluorinated solvent, and by which it is possible to suitably prevent a decrease in battery capacity. A method for producing the non-aqueous electrolyte solution disclosed here includes a fluorinated solvent provision step for preparing the fluorinated solvent, a highly polar solvent provision step for preparing a highly polar solvent having a relative dielectric constant of 40 or more, a LiBOB dissolution step for preparing a highly concentrated LiBOB solution by dissolving LiBOB in the highly polar solvent at a concentration that exceeds the saturation concentration in the fluorinated solvent, and a mixing step for mixing the fluorinated solvent with the highly concentrated LiBOB solution.

Abstract: A nonaqueous electrolytic solution is a nonaqueous electrolytic solution for a lithium secondary battery, the lithium secondary battery including a positive electrode that includes a positive electrode active material, and a negative electrode that includes a negative electrode active material which is a carbonaceous material storing and releasing a lithium ion. The nonaqueous electrolytic solution includes: one or more anions selected from an oxalato borate anion and an oxalato phosphate anion; and one or more arylamine compounds. The nonaqueous electrolytic solution is present between the positive electrode and the negative electrode and conducts a lithium ion.

Abstract: A powdery mixture of fine SiC powder with one or more oxide sintering additives of Al2O3, Y2O3, SiO2 and CaO is blended and uniformly dispersed in a polymeric SiC precursor to prepare a matrix-forming polymeric slurry. A preform of SiC fiber, which has quasi-stoichiometric composition with high crystallinity, is impregnated with the polymeric slurry and then hot-pressed at a temperature of 1600° C. or higher in presence of a liquid phase. Since the heat-resistant SiC fiber is used as strengthening fiber, the prepreg is sintered to a dense SiC composite excellent in mechanical properties by one-step hot-pressing.

Abstract: A preformed of SiC fiber, which is coated with one or more of C, BN and SiC, is impregnated with a slurry, which suspends fine SiC powder and a sintering additive therein. The impregnated preform is hot-pressed at 1600-1800° C. with a pressure of 10 MPa or more. The sintering additive may be one or more of Al2O3, Y2O3, SiO2 and CaO. The slurry may futher contain a silicone polymer selected from polycarbosilane, polyvinylsilane and polymethylsilane. Reaction of SiC fiber with a matrix is inhibited by the coating, so as to manufacture a SiC fiber-reinforced SiC-matrix composite remarkably improved in mechanical properties.

Abstract: A mixed polymer liquid is prepared by mixing a polycarbosilane-dissolved organic solvent with poly(methylsilane) and moderated to viscosity of 5–20 Pa·s by heat-treatment to promote partial cross-linking reaction. The mixed-polymer is then melt-spun to fiber at 250–350° C. The fiber is cured by treatment at 100–200° C. in an oxidizing atmosphere, and baked at 1000° C. or higher. Due to thermosetting action of poly(methylsilane), the mixed polymer liquid is continuously melt-spun without breakage, and SiC fiber produced in this way is useful for reinforcement of SiC composite excellent in toughness, strength and heat-resistance.