POWER STORAGE DEVICE INCLUDING FIRST ELECTROLYTE CONTAINING ELEMENT HAVING LOWER ALLRED-ROCHOW ELECTRONEGATIVITY THAN Si AND SECOND ELECTROLYTE CONTAINING PF6

摘要

To provide a power storage device provided with a Si-containing negative electrode active material, which has excellent characteristics such as a capacity retention rate.SOLUTION: The power storage device includes: a negative electrode including a Si-containing negative electrode active material; a first electrolyte containing a charge carrier element Eand an element E(E≠E) having a lower Allred-Rochow Electronegativity than Si; and an electrolytic solution provided with a second electrolyte composed of the charge carrier element Eand PF.SELECTED DRAWING: None