Abstract: Provided is a sodium secondary battery including: a sodium ion conductive solid electrolyte separating an anode space and a cathode space from each other; an anode positioned in the anode space and containing sodium; a cathode solution positioned in the cathode space; and a cathode immersed in the cathode solution and including graphite felt formed with open pore channel of which an opening part is formed on a surface of the graphite felt facing the solid electrolyte.

Abstract: Provided are a solid electrolyte for a sodium secondary battery, and a surface treatment method thereof, and more specifically, a solid electrolyte for a sodium secondary battery capable of having excellent electrochemical performance by improving wettability with respect to molten sodium, even under a low temperature operation environment of 250° C. or less, and a surface treatment method thereof.

Abstract: Provided is a sodium secondary battery including a graphite felt having a maximum porosity on a surface facing a solid electrolyte and a decreased porosity in a thickness direction, as a cathode current collector impregnated with an electrolyte.

Abstract: Provided are a solid electrolyte for a sodium secondary battery, and a surface treatment method thereof, and more specifically, a solid electrolyte for a sodium secondary battery capable of having excellent electrochemical performance by improving wettability with respect to molten sodium, even under a low temperature operation environment of 250° C. or less, and a surface treatment method thereof.

Abstract: Provided is a sodium secondary battery including: a sodium ion conductive solid electrolyte separating an anode space and a cathode space from each other; an anode positioned in the anode space and containing sodium; a cathode solution positioned in the cathode space; and a cathode immersed in the cathode solution and including graphite felt formed with open pore channel of which an opening part is formed on a surface of the graphite felt facing the solid electrolyte.

Abstract: Provided is a sodium secondary battery including: a sodium ion conductive solid electrolyte separating an anode space and a cathode space from each other; an anode positioned in the anode space and containing sodium; a cathode solution positioned in the cathode space; and a cathode immersed in the cathode solution and including graphite felt formed with grooves arranged in parallel with each other in a surface of the graphite felt facing the solid electrolyte.

Abstract: Provided is a sodium secondary battery including a graphite felt having a maximum porosity on a surface facing a solid electrolyte and a decreased porosity in a thickness direction, as a cathode current collector impregnated with an electrolyte.

Abstract: Disclosed is a method for preparing an MnO2/carbon composite for a lithium-air secondary battery by preparing a precursor solution by dissolving permanganate powder in distilled water, preparing a MnO2/carbon composite by dispersing carbon in the precursor solution and using a reducing agent, and mixing the MnO2/carbon composite with polyvinylidene fluoride (PVdF) and supporting the mixture on nickel foam. According to the method for preparing a MnO2/carbon composite for a lithium-air secondary battery, the MnO2/carbon composite is prepared by dispersing carbon in a permanganate solution, instead of simply mixing carbon with manganese oxide, and thus the binding force between carbon and manganese oxide and the dispersion of carbon in manganese oxide can increase. The MnO2/carbon composite prepared by the above method has improved catalytic performance as an air electrode for a lithium-air secondary battery and thus can be effectively used as an electrode material for lithium-air secondary batteries.