NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, METHOD FOR MANUFACTURING POSITIVE ELECTRODE SHEET OF NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, AND METHOD FOR MANUFACTURING NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

This non-aqueous electrolyte secondary battery includes an electrode coil body formed by winding a positive electrode sheet and a negative electrode sheet with a separator interposed between the sheets. The positive electrode sheet thereof is manufactured through a coating process wherein a positive electrode mixture paste is applied to a current collecting sheet to form a mixture layer. Prior to the coating process, a section of the current collecting sheet that will not be coated and a section that will be coated are differentiated in terms of wettability. Alternatively, a positive electrode mixture paste in which the ratio of viscosity at a slow shear velocity and viscosity at a fast shear velocity (100 s-1) is within a predetermined range is used. Thus, the cross-sectional shape of the width-direction end of the mixture layer formed in the coating process is a steep cross-sectional shape, wherein the width of a section having a thickness that is 50% or less than that of the center flat portion of the mixture layer in the width direction is 100 μm or less. Accordingly, problems caused by a thin-layer area at the mixture layer end of the positive electrode sheet of the non-aqueous electrolyte secondary battery can be effectively prevented.