▎ 摘　　要

NOVELTY - A double-coated ternary positive electrode material comprises a rigid oxide layer and a flexible polymer layer. USE - Double-coated ternary positive electrode material used in sulfide solid-state lithium battery (claimed). ADVANTAGE - The double-coated ternary positive electrode material contains flexible polypyrrole coating having a soft structure and is located between the ternary cathode material and the sulfide electrolyte, relieves the stress and strain between the ternary cathode material and the sulfide solid electrolyte, reduces the interface impedance, and prevents the interface side reaction. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: Preparation of double-coated ternary positive electrode material, and Sulfide solid-state lithium battery, which comprises a composite positive electrode layer, a sulfide solid electrolyte layer, and a metal lithium indium alloy negative electrode layer.