LITHIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a novel and improved lithium ion secondary battery that can enhance the discharge capacity and cycle characteristic of a full solid type lithium ion secondary battery.SOLUTION: A lithium ion secondary battery has coating particles which contain positive electrode active material secondary particles each comprising plural aggregated positive electrode active material primary particles, and coating layers covering at least parts of the surfaces of the positive electrode active material secondary particles, and solid electrolyte particles which are in contact with the coating particles. The average particle diameter of the positive electrode material secondary particles ranges from 3.0 to 10.0 μm. The coating layer contains an element X different from nickel, and is amorphous. The mole ratio of the element X contained in the coating layer to all the metal elements excluding lithium in the positive electrode active material secondary particles ranges from 0.1 to 10.0 mol%.SELECTED DRAWING: Figure 1