SOLID-STATE SODIUM-BASED SECONDARY CELL HAVING A SODIUM ION CONDUCTIVE CERAMIC SEPARATOR

摘要

The present invention provides a solid-state sodium-based secondary cell (or rechargeable battery) (10). The secondary cell (10) comprises a solid sodium metal negative electrode (20) that is disposed in a non-aqueous negative electrolyte solution (25) that includes an ionic liquid. Additionally, the cell (10) comprises a positive electrode (35) that is disposed in a positive electrolyte solution (40). A sodium ion conductive electrolyte membrane (45) separates the negative electrolyte solution (25) from the positive electrolyte solution (40). The cell may operate at room temperature. Additionally, where the negative electrolyte solution (25) contains the ionic liquid, the ionic liquid may impede dendrite formation on the surface of the negative electrode (20) as the cell (10) is recharged and sodium ions are reduced onto the negative electrode (20).