NONAQUEOUS ELECTROLYTE SECONDARY CELL AND METHOD FOR PRODUCING SAME

摘要

A nonaqueous electrolyte secondary cell 10 provided by the present invention includes a nonaqueous electrolyte solution, and an electrode unit 50 that includes a positive electrode 64 and a negative electrode 84. The negative electrode 84 includes a negative electrode current collector 82 and a negative electrode mixture layer 86 that contains at least a negative electrode active material and is formed on a surface of the negative electrode current collector 82. A coating film containing at least boron (B) and sodium (Na) is formed on a surface of the negative electrode active material in the negative electrode mixture layer 86, and the ratio A/B is less than 0.1 where A is the amount [µg/cm 2 ] of sodium (Na) and B is the amount [µg/cm 2 ] of boron (B) that are contained in the coating film per unit area of the negative electrode mixture layer 86.