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Unlocking the role ...
Unlocking the role of electrolyte concentration for Na-O 2 batteries
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- Ortiz-Vitoriano, N. (författare)
- Basque Foundation for Science (Ikerbasque)
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- de Larramendi, I. Ruiz (författare)
- Universidad del Pais Vasco / Euskal Herriko Unibertsitatea,University of the Basque Country (UPV/EHU)
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- Åvall, Gustav, 1988 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology,Humboldt-Universität zu Berlin,Humboldt University of Berlin
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Cid, R. (författare)
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Enterría, M. (författare)
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- Johansson, Patrik, 1969 (författare)
- Centre national de la recherche scientifique (CNRS),Chalmers tekniska högskola,Chalmers University of Technology
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- Bouchal, Roza, 1990 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2024
- 2024
- Engelska.
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Ingår i: Energy Storage Materials. - 2405-8297. ; 70
- Relaterad länk:
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Na-O2 batteries have attracted great interest in recent years mainly due to their high energy density, in theory having prospects to outperform the commercialized lithium-ion batteries. In the quest for optimization, a recently explored approach is to use highly concentrated electrolytes (HCEs). The knowledge of molecular level of solvation as function of electrolyte concentration and its impact on Na-O2 battery performance is, however, still very limited. In this work, experimental and computational methods are used to characterize the cation solvation and when the emergence of anions into the cation first solvation shell occurs, which affects the de-solvation process and formation of discharge products. Furthermore, the solid electrolyte interphase (SEI) formed using HCEs demonstrates presence of anion fragments, with poorer protection of the Na metal anode. Moreover, the use of HCEs is also linked to lowered capacity, possibly due to a decrease in the size of the cubic-shaped discharge products as the electrolyte concentration increases, causing clogging of the pores of the air cathode. Thus, increasing the electrolyte salt concentration seems to have a detrimental effect on the cyclability of Na-O2 batteries. Instead, electrolytes with a lower than conventional salt concentration show the best performance, which highlights the importance of carefully tuning the cation solvation alongside overall physico-chemical properties to enhance battery performance.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Annan kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Other Chemical Engineering (hsv//eng)
Nyckelord
- Solid electrolyte interphase
- Solvation structure
- Na solvation and desolvation
- Na-O battery 2
- Concentrated electrolyte
- Na metal
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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