METHOD OF PREPARING NEGATIVE ELECTRODE

The present invention relates to a method of preparing a negative electrode which includes the steps of: forming a simple cell by sequentially stacking a preliminary negative electrode, a separator, and a lithium metal, applying a current after the simple cell is immersed in an electrolyte solution containing a lithium salt and a solvent, separating the preliminary negative electrode from the simple cell after removing the simple cell immersed in the electrolyte solution from the electrolyte solution, washing the separated preliminary negative electrode, performing first drying on the washed preliminary negative electrode at room temperature, and performing second drying on the first dried preliminary negative electrode at a temperature of 30°C to 70°C in a vacuum state.