Sodium electrochemical interfaces with NaSICON-type ceramics
| DWPI Title: Improving sodium electrochemical interface used in low-temperature molten sodium battery, involves providing sodium-ion conducting NaSICON-type ceramic having surface, where NaSICON-type ceramic comprises three-dimensional hexagonal framework of corner-sharing oxide tetrahedra and octahedra |
| Abstract: The present invention is directed to the modification of sodium electrochemical interfaces to improve performance of NaSICON-type ceramics in a variety of electrochemical applications. Enhanced mating of the separator-sodium interface by means of engineered coatings or other surface modifications results in lower interfacial resistance and higher performance at increased current densities, enabling the effective operation of molten sodium batteries and other electrochemical technologies at low and high temperatures. |
| Use: Method for improving a sodium electrochemical interface used in low-temperature molten sodium battery (claimed). |
| Advantage: The method enhances mating of the separator-sodium interface by means of engineered coatings or other surface modifications results in lower interfacial resistance and higher performance at increased current densities, enables the effective operation of molten sodium batteries and other electrochemical technologies at low and high temperatures. |
| Novelty: Improving a sodium electrochemical interface involves providing a sodium-ion conducting NaSICON-type ceramic having a surface, where the NaSICON-type ceramic comprises a three-dimensional hexagonal framework of corner-sharing oxide tetrahedra and octahedra having the basic formula A1+x+y M′x M2−x ByB′3−y O12 , where A is a sodium ion occupying interstitial sites, M and M′ are multivalent transition metal cations occupying octahedral sites, and B and B′ typically are silicon and phosphorous occupying tetrahedral sites, and where 0≤ x≤ 2 and 0≤ y≤ 3, and forming a sodium ion-conducting intermetallic phase on the surface of the NaSICON-type ceramic, and providing a sodium electrochemical interface with improved sodium ion conduction from a sodium source through the NaSICON-type ceramic. |
| Filed: 11/25/2020 |
| Application Number: US17104306A |
| Tech ID: SD 15241.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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