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). While the secondary cell can include any suitable component, in some cases, the secondary cell comprises a solid sodium metal negative electrode that is disposed in a non-aqueous negative electrolyte solution that includes an ionic liquid. Additionally, the cell comprises a positive electrode that is disposed in a positive electrolyte solution. In order to separate the negative electrode and the negative electrolyte solution from the positive electrolyte solution, the cell includes a sodium ion conductive electrolyte membrane. Because the cell's negative electrode is in a solid state as the cell functions, the cell may operate at room temperature. Additionally, where the negative electrolyte solution contains the ionic liquid, the ionic liquid may impede dendrite formation on the surface of the negative electrode as the cell is recharged and sodium ions are reduced onto the negative electrode.

主权项

1. A sodium-based secondary cell, comprising:
a negative electrode compartment comprising a negative electrode disposed in a non-aqueous, ionic, negative electrolyte solution, wherein the negative electrode electrochemically oxidizes to release sodium ions during discharge and electrochemically reduces sodium ions to sodium metal during charge; a positive electrode compartment comprising a positive electrode disposed in a positive electrolyte solution; and a sodium ion conductive electrolyte membrane that separates the negative electrolyte solution from the positive electrolyte solution, and wherein the negative electrode is solid when the cell functions, wherein the cell functions at an operating temperature below about 100° C.