| abstract |
(57) Abstract: high voltage, high capacity, and to provide a highly safe nonaqueous secondary battery. SOLUTION: In a non-aqueous secondary battery having a positive electrode, a negative electrode and a non-aqueous electrolyte, a discharge potential curve has an inflection point in a region of 4.0 V or more and 4.2 V or less in terms of Li reference potential, and A non-aqueous secondary battery is characterized by having peaks near 291 eV, near 530 eV, and near 532 eV in the XPS analysis of the positive electrode mixture layer surface. The non-aqueous secondary battery is charged such that the upper limit of the positive electrode potential is 4.4 V or more and 4.6 V or less as Li reference potential. |