| Autor: |
Vaselabadi SA; Chemical and Biological Engineering, Colorado School of Mines, Golden, Colorado 80401, United States., Palmer K; Chemical Engineering, Rose-Hulman Institute of Technology, Terre Haute, Indiana 47803-3999, United States., Smith WH; Chemical and Biological Engineering, Colorado School of Mines, Golden, Colorado 80401, United States., Wolden CA; Chemical and Biological Engineering, Colorado School of Mines, Golden, Colorado 80401, United States. |
| Abstrakt: |
Solid-state sodium-ion batteries employing superionic solid-state electrolytes (SSEs) offer low manufacturing costs and improved safety and are considered to be a promising alternative to current Li-ion batteries. Solid-state electrolytes must have high chemical/electrochemical stability and superior ionic conductivity. In this work, we employed precursor and solvent engineering to design scalable and cost-efficient solution routes to produce air-stable sodium selenoantimonate (Na 3 SbSe 4 ). First, a simple metathesis route is demonstrated for the production of the Sb 2 Se 3 precursor that is subsequently used to form ternary Na 3 SbSe 4 through two different routes: alcohol-mediated redox and alkahest amine-thiol approaches. In the former, the electrolyte was successfully synthesized in EtOH by using a similar redox solution coupled with Sb 2 Se 3 , Se, and NaOH as a basic reagent. In the alkahest approach, an amine-thiol solvent mixture is utilized for the dissolution of elemental Se and Na and further reaction with the binary precursor to obtain Na 3 SbSe 4 . Both routes produced electrolytes with room temperature ionic conductivity (∼0.2 mS cm -1 ) on par with reported performance from other conventional thermo-mechanical routes. These novel solution-phase approaches showcase the diversity and application of wet chemistry in producing selenide-based electrolytes for all-solid-state sodium batteries. |
