ELECTRICITY STORAGE DEVICE, POSITIVE ELECTRODE AND POROUS SHEET USED IN ELECTRICITY STORAGE DEVICE, AND METHOD FOR IMPROVING DOPE RATE

摘要

Provided is an electricity storage device having an excellent capacity density, and having an electrolyte layer (3) as well as a positive electrode (2) and a negative electrode (4) provided so as to face each other across the electrolyte layer (3); wherein the positive electrode (2) is a complex comprising at least the following materials (A) and (B), material (B) is fixed in the positive electrode, and when the weight of material (A) used is X grams and the apparent volume of the positive electrode (2) is Y liters, X/Y (positive electrode active material concentration g/L) is 100 to 320. (A) A positive electrode active material having an electrical conductivity that changes due to insertion and desorption of ions. (B) Anionic material.