SODIUM-ALUMINUM BATTERY WITH SODIUM ION CONDUCTIVE CERAMIC SEPARATOR

摘要

The present invention provides a sodium-aluminum secondary cell. The cell includes a sodium metal negative electrode, a positive electrode compartment that includes an aluminum positive electrode disposed in a positive electrolyte mixture of NaAl2X7 and NaAlX4, where X is a halogen atom or mixture of different halogen atoms selected from chlorine, bromine, and iodine, and a sodium ion conductive electrolyte membrane that separates the negative electrode from the positive electrolyte. In such cases, the electrolyte membrane can include any suitable material, including, without limitation, a NaSICON-type membrane. Generally, when the cell functions, both the sodium negative electrode and the positive electrolyte are molten and in contact with the electrolyte membrane. Additionally, the cell is functional at an operating temperature between about 100° C. and about 200° C.

主权项

1. A sodium-aluminum secondary cell, comprising:
a metal sodium negative electrode, which electrochemically oxidizes to release sodium ions during discharge and electrochemically reduces sodium ions to sodium metal during recharging; a positive electrode compartment comprising an aluminum positive electrode disposed in a positive electrolyte comprising a mixture of NaAl2X7 and NaAlX4, where X is a halogen atom or mixture of different halogen atoms selected from chlorine, bromine, and iodine; and a sodium ion conductive electrolyte membrane that separates the metal sodium negative electrode from the positive electrolyte, wherein the metal sodium negative electrode and the positive electrolyte are molten and in contact with the conductive electrolyte membrane as the cell operates, and wherein the cell functions at an operating temperature between about 100° C. and about 200° C.