A Carboranyl Electrolyte Enabling Highly Reversible Sodium Metal Anodes via a "Fluorine-Free" SEI.

Autor: Tomich AW; Chemical Sciences and Engineering, Argonne National Laboratory, Lemont, IL 60439, USA.; Department of Chemistry, University of California, Riverside, Riverside, CA 92521, USA., Park J; Chemical Sciences and Engineering, Argonne National Laboratory, Lemont, IL 60439, USA., Son SB; Chemical Sciences and Engineering, Argonne National Laboratory, Lemont, IL 60439, USA., Kamphaus EP; Materials Science and Engineering, Argonne National Laboratory, Lemont, IL 60439, USA., Lyu X; Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115, USA., Dogan F; Chemical Sciences and Engineering, Argonne National Laboratory, Lemont, IL 60439, USA., Carta V; Department of Chemistry, University of California, Riverside, Riverside, CA 92521, USA., Gim J; Chemical Sciences and Engineering, Argonne National Laboratory, Lemont, IL 60439, USA., Li T; Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115, USA.; X-ray Science Division and Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, IL 60439, USA., Cheng L; Materials Science and Engineering, Argonne National Laboratory, Lemont, IL 60439, USA., Lee E; Chemical Sciences and Engineering, Argonne National Laboratory, Lemont, IL 60439, USA., Lavallo V; Department of Chemistry, University of California, Riverside, Riverside, CA 92521, USA., Johnson CS; Chemical Sciences and Engineering, Argonne National Laboratory, Lemont, IL 60439, USA.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2022 Dec 19; Vol. 61 (51), pp. e202208158. Date of Electronic Publication: 2022 Nov 17.
DOI: 10.1002/anie.202208158
Abstrakt: Realization of practical sodium metal batteries (SMBs) is hindered due to lack of compatible electrolyte components, dendrite propagation, and poor understanding of anodic interphasial chemistries. Chemically robust liquid electrolytes that facilitate both favorable sodium metal deposition and a stable solid-electrolyte interphase (SEI) are ideal to enable sodium metal and anode-free cells. Herein we present advanced characterization of a novel fluorine-free electrolyte utilizing the [HCB 11 H 11 ] 1- anion. Symmetrical Na cells operated with this electrolyte exhibit a remarkably low overpotential of 0.032 V at a current density of 2.0 mA cm -2 and a high coulombic efficiency of 99.5 % in half-cell configurations. Surface characterization of electrodes post-operation reveals the absence of dendritic sodium nucleation and a surprisingly stable fluorine-free SEI. Furthermore, weak ion-pairing is identified as key towards the successful development of fluorine-free sodium electrolytes.
(© 2022 Wiley-VCH GmbH.)
Databáze: MEDLINE
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