ELECTRODE MIXTURE SHEET, ELECTRODE, SECONDARY BATTERY, AND METHOD FOR PRODUCING ELECTRODE MIXTURE SHEET

An electrode mixture sheet having high tensile strength and low resistance, an electrode and a secondary battery each including the electrode mixture sheet, and a method of producing an electrode mixture sheet. An electrode mixture sheet including: a polytetrafluoroethylene; a carbon material; and an electrode active material other than the carbon material and/or a fluororesin other than the polytetrafluoroethylene, the electrode mixture sheet having a value X of 2300 or less, where the value X is expressed as interface length/amount of detected carbon in an image of carbon composition distribution in a 2000× field of view obtained by SEM-EDX analysis.