CATHODE MIXTURE FOR ALL SOLID-STATE BATTERY CATHODE FOR ALL SOLID-STATE BATTERY ALL SOLID-STATE BATTERY AND METHOD FOR PRODUCING THE SAME

摘要

When an all solid-state battery is obtained by using a cathode mixture after preparing the cathode mixture by mixing a layered halite-type cathode active material with a sulfide solid electrolyte, internal resistance of the all solid-state battery is increased since oxygen is released from the cathode active material during charging of the all solid-state battery such that the sulfide solid electrolyte is oxidized. The purpose of the present invention is to suppress release of oxygen during a charging process by reducing cobalt concentration of the surface of the layered halite-type cathode active material while securing high capacity by increasing cobalt concentration within the layered halite-type cathode active material. Specifically, a cathode mixture for an all solid-state battery of the present invention comprises a cathode active material and a sulfide solid electrolyte, wherein the cathode active material is formed of a composite oxide having a layered halite-type crystal phase and including Li, Ni, Co and Mn, and the cobalt concentration within the cathode active material is higher than the cobalt concentration of the surface of the cathode active material.