Method for producing electrode covered with sodium metal

A production method for producing an electrode covered with sodium metal comprising any one of steps selected from the group consisting of the following steps (1) to (4):

• (1) a step of applying a sodium dispersion containing sodium metal and at least one substance selected from the group consisting of an imide salt and a binder, on a current collector in an inert gas environment having an oxygen concentration of not more than 0.01% and a dew point of not more than −10° C., followed by heating and drying;
• (2) a step of pressure bonding a piece of solid sodium metal having a surface which exhibits a metallic luster onto a current collector in an inert gas environment having an oxygen concentration of not more than 0.01% and a dew point of not more than −10° C.;
• (3) a step of vapor-depositing sodium metal on a current collector in a reduced pressure environment;
• and
• (4) a step of immersing a current collector having a surface fired at a temperature ranging from 150 to 300° C. in molten sodium metal after removing a coating film which is generated on a surface and formed from impurities, in an inert gas environment having an oxygen concentration of not more than 0.01% and a dew point of not more than −10° C.