LITHIUM ION SECONDARY BATTERY AND MANUFACTURE METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide an Li ion secondary battery which is superior in a charging discharging cycle characteristic and a manufacturing method thereof. SOLUTION: This Li ion secondary battery incorporates a negative electrode which is constructed such that a negative electrode mix that is mainly composed of a carbonaceous material whose face-to-face distance of (002) surface is not more than 3.4 Å is applied as coating on a current collector. The negative electrode is applied with at least once of a cathode electrolytic treatment in a Li-contained electrolyte, before it is assembled, until a natural electrode electric potential A at the time of being immersed in the Li-contained an electrolyte becomes not more than +0.15 V electric potential (an electric potential X) with respect to a standard single electrode electric potential of Li shown in a reference electrode.