Patent ID: 9640606
Date: 2017-05-02
CPC Classifications: H01G,H01L,H01M,Y02E,Y02T

Claim:
1. An electricity storage device comprising: a first electrode; a second electrode; an electricity storage layer which is placed between the first electrode and the second electrode and which contains a mixture of an insulating material and n-type semiconductor particles; and a p-type semiconductor layer placed between the electricity storage layer and the second electrode, wherein the n-type semiconductor particles contain at least one of the group consisting of a titanium-niobium composite oxide and a titanium-tantalum composite oxide, the n-type semiconductor particles have an average size of 1 nm to 20 nm, and the average size is an average of value a of fifty n-type semiconductor particles, where value αof one of the fifty n-type semiconductor particles is 2×(S/3.14)