POSITIVE ELECTRODE ACTIVE SUBSTANCE FOR ALL SOLID-STATE LITHIUM SECONDARY BATTERY

• Main Authors: MITSUMOTO Tetsuya, WASHIDA Daisuke
• Format: Patent
• Language: English; French; German
• Published: 08.07.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

Provided is, with respect to a 5 V-class spinel, a spinel-type lithium manganese-containing composite oxide that can improve rate characteristics and cycle characteristics by suppressing resistance while improving ion conductivity. Proposed is a positive electrode active substance for an all solid-state lithium secondary battery having an operating potential of 4.5 V or more at a metal Li reference potential, wherein the surface of the present core particles composed of a spinel-type lithium manganese-containing composite oxide containing at least Li, Mn, O, and two or more elements other than these is coated with an amorphous compound containing Li, A (A represents one element or a combination of two or more elements selected from the group consisting of Ti, Zr, Ta, Nb, Zn, W, and Al), and O; and primary particles of the present core particles are composed of a polycrystal; and wherein the D50 is 0.5 to 9 µm, the value of ((|mode diameter - D50|/mode diameter) × 100) is 0 to 25%, the value of ((|mode diameter - D10|/mode diameter) × 100) is 20 to 58%, and the value of the average primary particle diameter/D50 is 0.20 to 0.99.