NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, AND MANUFACTURING METHOD AND EVALUATION METHOD THEREOF (AS AMENDED)

摘要

A non-aqueous electrolyte secondary battery according to the present invention includes a positive electrode, a negative electrode, and a non-aqueous electrolyte solution. The negative electrode includes a coating derived from lithium bis(oxalate)borate. Assuming that an intensity of a peak attributable to a three-coordinate structure of the coating measured by an XAFS method is represented by a and an intensity of a peak attributable to a four-coordinate structure of the coating measured by the XAFS method is represented by β, the coating formed on the surface of the negative electrode satisfies a condition of α/(α+β)≧0.4. Accordingly, it is possible to provide a non-aqueous electrolyte secondary battery capable of reliably obtaining the effect due to the formation of a coating.

主权项

1. A method of evaluating a non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode including a carbon material, and a non-aqueous electrolyte solution, the method comprising:
measuring, by an XAFS method, an intensity α of a peak attributable to a three-coordinate structure of a coating derived from lithium bis(oxalate)borate formed on the negative electrode; measuring, by the XAFS method, an intensity 6 of a peak attributable to a four-coordinate structure of the coating; and evaluating the non-aqueous electrolyte secondary battery based on whether or not the coating satisfies α/(α+β)≧0.4.