Abstract: Provided is a technique with high strength, superior ionic conductivity, and superior electrical characteristics. A lithium ion secondary battery includes a positive electrode, a negative electrode, and a polymer electrolyte. The polymer electrolyte contains a lithium salt, an ionic liquid, and a polymer. The ionic liquid contains a bis(fluorosulfonyl)imide anion as an anion component. The content of the lithium salt is 2 mol/kg or more and 6 mol/kg or less based on the sum of the content of the ionic liquid and the content of the polymer. The content of the polymer is 25% by mass or more and 40% by mass or less based on the sum of the content of the ionic liquid and the content of the polymer.

Abstract: A composition that includes a dispersion stabilizer for an electrode coating liquid for a power storage device is provided. The composition has superior ability to stably disperse an electrode active material and a conductive material, and makes it possible to manufacture a uniform electrode, even when a dispersion device that has weak shear force is used. A dispersant for an electrode coating liquid for a power storage device, the dispersant being characterized by containing cellulose fibers that satisfy (a)-(c). (a) The number average width of the short widths is 2-200 nm. (b) The aspect ratio is 7.5-250. (c) Cellulose I crystals are included and the crystallinity thereof is 70%-95%.

Abstract: An electrode coating liquid composition that contains an electrode active material, a conductive auxiliary, a dispersant, and a binding agent. The dispersant contains cellulose fibers that satisfy (a)-(c). A total amount of the dispersant and the binding agent is 0.5 mass % or more and 15 mass % or less with respect to 100 mass % of the solid content of the electrode coating liquid composition. (a) the number average width of the shortest widths is 2 nm or more and 200 nm or less. (b) the aspect ratio is 7.5 or more and 75 or less. (c) cellulose I crystals are included and the crystallinity thereof is 70% or more and 95% or less.

Abstract: An electrode coating liquid composition that contains an electrode active material, a conductive auxiliary, a dispersant, and a binding agent. The dispersant contains cellulose fibers that satisfy (a)-(c). A total amount of the dispersant and the binding agent is 0.5 mass % or more and 15 mass % or less with respect to 100 mass % of the solid content of the electrode coating liquid composition. (a) the number average width of the shortest widths is 2 nm or more and 200 nm or less. (b) the aspect ratio is 7.5 or more and 75 or less. (c) cellulose I crystals are included and the crystallinity thereof is 70% or more and 95% or less.

Abstract: A composition that includes a dispersion stabilizer for an electrode coating liquid for a power storage device is provided. The composition has superior ability to stably disperse an electrode active material and a conductive material, and makes it possible to manufacture a uniform electrode, even when a dispersion device that has weak shear force is used. A dispersant for an electrode coating liquid for a power storage device, the dispersant being characterized by containing cellulose fibers that satisfy (a)-(c). (a) The number average width of the short widths is 2-200 nm. (b) The aspect ratio is 7.5-250. (c) Cellulose I crystals are included and the crystallinity thereof is 70%-95%.

Abstract: A lithium ion secondary battery capable of charging in 15 minutes or less has a cathode with a composite layer on a surface of a collector having an active material and a conducting agent, an anode with an active material, an insulator between the cathode and anode, and an electrolyte with lithium ions. The cathode active material is represented by LixMPO4, where M is a metal atom and 0<x<2 and the conducting agent contains particles between 3 ?m and 12 ?m in size and in an amount of 1% or more by weight.

Abstract: A lithium ion secondary battery capable of charging in 15 minutes or less has a cathode with a composite layer on a surface of a collector having an active material and a conducting agent, an anode with an active material, an insulator between the cathode and anode, and an electrolyte with lithium ions. The cathode active material is represented by LixMPO4, where M is a metal atom and 0<x<2 and the conducting agent contains particles between 3 ?m and 12 ?m in size and in an amount of 1% or more by weight.

Abstract: A lithium ion secondary battery capable of charging in 15 minutes or less has a cathode with a composite layer on a surface of a collector having an active material and a conducting agent, an anode with an active material, an insulator between the cathode and anode, and an electrolyte with lithium ions. The cathode active material is represented by LixMPO4, where M is a metal atom and 0<x<2 and the conducting agent contains particles between 3 ?m and 12 ?m in size and in an amount of 1% or more by weight.