POSITIVE PLATE FOR NONAQUEOUS ELECTROLYTIC SOLUTION SECONDARY BATTERY, NONAQUEOUS ELECTROLYTIC SOLUTION SECONDARY BATTERY AND METHOD OF MANUFACTURING NONAQUEOUS ELECTROLYTIC SOLUTION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a positive plate for a nonaqueous electrolytic solution secondary battery in which lithium phosphoric acid is properly distributed in a positive electrode active material layer, a nonaqueous electrolytic solution secondary battery and a method of manufacturing a nonaqueous electrolytic solution secondary battery.SOLUTION: In a positive electrode plate for a nonaqueous electrolytic solution secondary battery, a dispersion index value C represented by C=B/Aa is 0.8 or less when A represents a small particle diameter ratio and B represents a variation coefficient B. The small particle diameter ratio A and the variation coefficient B are obtained by a measurement result of phosphorus element (P) at measurement sites in a measurement region of a positive electrode active material layer by EPMA. The small particle diameter ratio A is the ratio of the number of small particle diameter places at which the detection intensity for trilithium phosphoric acid is equal to or less than the detection intensity for trilithium phosphoric acid of particle diameter of 1 μm to the number of existing places of phosphoric element out of the measurement sites. The variation coefficient B is the ratio of the standard deviation of an integration value of plural divided regions corresponding to the sum of the detection intensities at the existing places within each divided region of the measurement region to the arithmetic average of the integration values of the plural divided regions.SELECTED DRAWING: Figure 5