| 摘要 |
PROBLEM TO BE SOLVED: To provide an all solid-state lithium ion secondary battery having high voltage, low internal resistance and discharge capacity close to theoretical capacity, and capable of being manufactured at low cost, therefore reducing generation of an inert material due to an interfacial reaction at the interface between an electrode active material and a solid electrolyte, even when sintering is collectively carried out.SOLUTION: In an all solid-state lithium ion secondary battery including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer arranged between the positive electrode layer and the negative electrode layer, an electrode active material layer included in the positive electrode layer is a phosphate having an olivine structure, and a solid electrolyte crystal included in the solid electrolyte layer includes a polyphosphoric acid, and contains more than 16 mol% and 25 mol% or less of LiO, in terms of mole percent of oxides. |
