Designing solid-liquid interphases for sodium batteries
| Autor: | Shuya Wei, Lynden A. Archer, Lena F. Kourkoutis, Tomas Arias, Yalcin Ozhabes, Snehashis Choudhury, Akanksha Agrawal, Deniz Gunceler, Michael J. Zachman, Pooja Nath, Zhengyuan Tu, Jung Hwan Shin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Battery (electricity)
Materials science Sodium Science General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry Electrochemistry 01 natural sciences General Biochemistry Genetics and Molecular Biology Article Ion Sodium bromide chemistry.chemical_compound lcsh:Science Multidisciplinary General Chemistry Sodium ion transport 021001 nanoscience & nanotechnology 0104 chemical sciences Anode chemistry Chemical engineering lcsh:Q 0210 nano-technology |
| Zdroj: | Nature Communications, Vol 8, Iss 1, Pp 1-10 (2017) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | Secondary batteries based on earth-abundant sodium metal anodes are desirable for both stationary and portable electrical energy storage. Room-temperature sodium metal batteries are impractical today because morphological instability during recharge drives rough, dendritic electrodeposition. Chemical instability of liquid electrolytes also leads to premature cell failure as a result of parasitic reactions with the anode. Here we use joint density-functional theoretical analysis to show that the surface diffusion barrier for sodium ion transport is a sensitive function of the chemistry of solid–electrolyte interphase. In particular, we find that a sodium bromide interphase presents an exceptionally low energy barrier to ion transport, comparable to that of metallic magnesium. We evaluate this prediction by means of electrochemical measurements and direct visualization studies. These experiments reveal an approximately three-fold reduction in activation energy for ion transport at a sodium bromide interphase. Direct visualization of sodium electrodeposition confirms large improvements in stability of sodium deposition at sodium bromide-rich interphases. The chemistry at the interface between electrolyte and electrode plays a critical role in determining battery performance. Here, the authors show that a NaBr enriched solid–electrolyte interphase can lower the surface diffusion barrier for sodium ions, enabling stable electrodeposition. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|