| 摘要 |
PROBLEM TO BE SOLVED: To provide an electricity storage device excellent in capacity density.SOLUTION: A dual-mode type electricity storage device is an electricity storage device comprising: an electrolyte layer 3; and a positive electrode 2 and a negative electrode 4 provided opposing one another so as to sandwich the electrolyte layer therebetween. The positive electrode 2 comprises at least the following (X) and (Y), the (Y) is fixed within the positive electrode, and, when the anion amount of the (Y) per the apparent volume 1 L of the positive electrode 2 is A moles and the amount of electrolyte anions, which exist in the voids within the positive electrode, per the apparent volume 1 L of the positive electrode 2 is B moles, the value of A/B is 1.29-2.96. The negative electrode 4 includes the following (Z), and both cations and anions are replenished in the positive electrode during charging/discharging. (X) A positive electrode material, the conductivity of which changes according to the insertion and desorption of ions. (Y) An anionic material. (Z) A negative electrode material capable of inserting and desorbing metal or ions. |
