To provide a method of manufacturing a lithium ion secondary battery, preferably an all-solid-state lithium ion secondary battery, at a low manufacturing cost, in which charge/discharge of a large current is possible and high charge/discharge efficiency can be attained even at a large working current by reducing decomposition of electrode active material or production of a substance which inhibits ion conduction due to chemical reaction of electrode active material powder and solid-state electrolyte powder in an electrode layer on the grain boundary thereof or on the interface of the electrode layer and a solid-state electrolyte layer when an unfired body in the electrode layer of the lithium ion secondary battery is fired.

The method of manufacturing a lithium-ion secondary battery includes a step of making an electrode precursor by firing a mixture containing lithium ion conductive solid-state electrolyte powder and electrode active material powder with its surface covered at least partially with a coating layer not containing Li.