Ceramatec, Inc.

Sk Innovation Co., Ltd.

Field Upgrading Usa, Inc.

Alexis Eccleston

Mathew Robins

Sai Bhavaraju

Ashok V Joshi

Jeong Soo Kim

Chett Boxley

Dai In Park

W Grover Coors

Seung Ok Lee

Je Hyun Chae

Won Sang Koh

An intermediate temperature sodium-halogen secondary cell that includes a negative electrode compartment housing a negative, molten sodium-based electrode and a positive electrode compartment housing a current collector disposed in a highly conductive molten positive electrolyte. A sodium halide (NaX) positive electrode is disposed in a molten positive electrolyte comprising one or more AlXsalts, wherein X may be the same or different halogen selected from Cl, Br, and I, wherein the ratio of NaX to AlXis greater than or equal to one. A sodium ion conductive solid electrolyte membrane separates the molten sodium negative electrode from the molten positive electrolyte. The secondary cell operates at a temperature in the range from about 80&#xb0; C. to 210&#xb0; C.

Sodium-halogen secondary cell

Provided is a sodium secondary battery capable of operating at a low temperature. More particularly, the sodium secondary battery according to the present invention includes: an anode containing sodium; a cathode containing a transition metal and an alkali metal halide; and a sodium ion conductive solid electrolyte provided between the anode and the cathode, wherein the cathode is impregnated in a molten salt electrolyte containing a sodium.metal halogen salt including at least two kinds of halogens.

Sodium secondary battery

An intermediate temperature molten sodium-metal halide rechargeable battery utilizes a molten eutectic mixture of sodium haloaluminate salts having a relatively low melting point that enables the battery to operate at substantially lower temperature compared to the traditional ZEBRA battery system and utilize a highly conductive NaSICON solid electrolyte membrane. The positive electrode comprises a mixture of NaX and MX, where X is a halogen selected from Cl, Br and I and M is a metal selected Ni, Fe, and Zn. The positive electrode is disposed in a mixed molten salt positive electrolyte comprising at least two salts that can be represented by the formula NaAlX'X&#x2033;, where 0&#x3c;&#x3b4;&#x3c;4, wherein X&#x2032; and X&#x2033; are different halogens selected from Cl, Br and I. The positive electrode may include additional NaX added in a molar ratio ranging from 1:1 to 3:1 of NaX:NaAlX&#x2032;X&#x2033;.

Intermediate temperature sodium-metal halide battery

The present invention provides a molten sodium secondary cell. In some cases, the secondary cell includes a sodium metal negative electrode, a positive electrode compartment that includes a positive electrode disposed in a liquid positive electrode solution, and a sodium ion conductive electrolyte membrane that separates the negative electrode from the positive electrode solution. In such cases, the electrolyte membrane can comprise any suitable material, including, without limitation, a NaSICON membrane. Furthermore, in such cases, the liquid positive electrode solution can comprise any suitable positive electrode solution, including, but not limited to, an aqueous sodium hydroxide solution. Generally, when the cell functions, the sodium negative electrode is molten and in contact with the electrolyte membrane. Additionally, the cell is functional at an operating temperature between about 100&#xb0; C. and about 170&#xb0; C. Indeed, in some instances, the molten sodium secondary cell is functional between about 110&#xb0; C. and about 130&#xb0; C.

Low temperature molten sodium secondary cell with sodium ion conductive electrolyte membrane

Growing community of inventors

Midvale, UT, United States of America

Alexis Eccleston