| 摘要 |
<p>PROBLEM TO BE SOLVED: To surely remove water contained in an electrode and a separator without using a dry vessel of high breakdown strength by housing an element in a vessel, sealing the vessel, drying the entire vessel in an atmosphere of specific dew point, injecting a nonaqueous electrolyte through a liquid-injection port, and sealing the liquid-injection port. SOLUTION: With an electrode whose main component is carbon material as a positive electrode and a negative electrode, they are alternately laminated through a separator to form an element, which is housed in a case. Then a plurality of positive-electrode leads and a plurality of negative-electrode leads are welded, respectively, to a positive-electrode terminal and a negative-electrode terminal fitted to a lid, and the case is sealed with the lid. Then, the case housing the element is moved into an atmosphere whose dew point is -20 deg.C or below, and heated for drying at 100-300 deg.C. The inside of the case is vacuated for deairing, and a propylene carbonate solution comprising (C2H5)3 (CH3) NBF4 is injected through the liquid-injection port under the atmospheric pressure as an electrolyte, and then the liquid-injection port is closed.</p> |
