Electrolyte membrane for lithium-air battery, method of manufacturing same and lithium-air battery comprising same

An electrolyte membrane for a lithium-air battery manufactured by a method, wherein the method comprises:

• preparing an inorganic salt;
• preparing an inorganic melt admixture by melting the inorganic salt;
• immersing a separator in the inorganic melt admixture;
• and
• drying the immersed separator,
• wherein the separator has pores therein, and the inorganic melt admixture is incorporated into and attached to inner and outer portions of the separator,
• wherein the inorganic salt comprises:
• three types of the nitrogen-oxide compounds, four types of the nitrogen-oxide compounds, or five types of the nitrogen-oxide compounds,
• wherein the three types of the nitrogen-oxide compounds comprise an amount of about 29 mol % to 35 mol % of lithium nitrate, an amount of about 51 mol % to 56 mol % of potassium nitrite and an amount of about 10 mol % to 15 mol % of cesium nitrate,
• the four types of the nitrogen-oxide compounds comprise an amount of about 27 mol % to 31 mol % of lithium nitrate, an amount of about 38 mol % to 50 mol % of potassium nitrate, an amount of about 11 mol % to 20 mol % of sodium nitrate and an amount of about 10 mol % to 13 mol % of calcium nitrate, and
• the five types of the nitrogen-oxide compounds comprise an amount of about 14 mol % to 17 mol % of lithium nitrate, an amount of about 29 mol % to 31 mol % of potassium nitrate, an amount of about 28 mol % to 32 mol % of cesium nitrate, an amount of about 9 mol % to 11 mol % of sodium nitrate and an amount of about 13 mol % to 18 mol % of calcium nitrate,
• all the mol % based on the total mole of the nitrogen-oxide compounds,
• wherein the inorganic salt has a eutectic point of about 100° C. or less.