Thickening / stabilizing agent for electrode coating liquid of power storage device, coating liquid prepared using the thickening / stabilizing agent, electrode manufactured using the coating liquid, and power storage device using the electrode

摘要

PROBLEM TO BE SOLVED: To provide a thickening/stabilizing agent for a power storage device electrode coating liquid, which has superior dispersion stability of an electrode active material and a conductive material, which never causes the reduction in viscosity owing to a stirring shear force in a dispersion step, which is superior in binding property and electrolyte resistance, and which never causes a defect such as a streak or a pin hole in an electrode.SOLUTION: A thickening/stabilizing agent for a power storage device electrode coating liquid comprises: a cellulose fiber. In the thickening/stabilizing agent, substituent groups are introduced into hydroxyl groups of cellulose molecules of the cellulose fiber; the degree of substitution is 0.01-0.5. The cellulose has a crystal structure of I-type and/or II-type. The aspect ratio of the cellulose fiber is 50 or larger. The number average fiber width of the cellulose fiber is 2-500 nm.SELECTED DRAWING: None