A lithium ion secondary battery includes a positive electrode, a negative electrode and a thin film solid electrolyte including lithium ion conductive inorganic substance. The thin film solid electrolyte has thickness of 20 mu m or below and is formed dire...

A lithium ion secondary cell comprises a positive electrode (2), a negative electrode (5), a solid electrolyte (4) and a fiber layer (3) provided in an interface between the solid electrolyte and the positive electrode and/or in an interface between the so...