<p>Provided is a charging device including an anode containing a carbonic activation substance and a cathode. An electric charging process at the anode indicates an adsorption process of anions in a low-voltage region and an intercalation process in a high-voltage region. The electric charge at the cathode is caused by the adsorption of cations. At the complete discharge time, the state is made such that the cathode is inversely charged with the positive charge, or such that the cathode is charged with the unreleased but left negative charge.</p>
