SECONDARY BATTERY PRODUCING CHLORINE OR CHLORINE-BASED ACTIVE MATERIAL, AND BALLAST WATER TREATMENT DEVICE AND TREATMENT METHOD USING SAME

摘要

The present invention relates to a secondary battery and a secondary battery system, and provided is a chlorine-producing secondary battery comprising: a liquid cathode unit comprising a sodium-containing solution and a cathode current collector impregnated in the sodium-containing solution; an anode unit comprising a liquid organic electrolyte, an anode current collector impregnated in the liquid organic electrolyte, and an anode active material layer located on the surface of the anode current collector; a solid electrolyte located between the cathode unit and the anode unit; and a chlorine discharge unit connected to the cathode unit so as to draw out, to the outside, chlorine generated at the cathode unit during charging.