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Modulating aluminum solvation with ionic liquids for improved aqueous-based aluminum-ion batteries

Lahiri, Abhishek, Guan, Shaoliang and Chutia, Arunabhiram 2023. Modulating aluminum solvation with ionic liquids for improved aqueous-based aluminum-ion batteries. ACS Applied Energy Materials 6 (23) , pp. 11874-11881. 10.1021/acsaem.3c01745

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Aqueous-based Al-ion batteries are attractive alternatives to Li-ion batteries due to their safety, high volumetric energy density, abundance, and recyclability. Although aluminum-ion batteries are attractive, there are major challenges to overcome, which include understanding the nature of the passive layer of aluminum oxide on the aluminum anode, the narrow electrochemical window of aqueous electrolytes, and lack of suitable cathodes. Here, we report using experiments in conjunction with DFT simulations to clarify the role of ionic liquids (ILs) in altering the Al solvation dynamics, which in turn affects the aluminum electrochemistry and aqueous-based battery performance significantly. DFT calculations showed that the addition of 1-ethyl-3-methylimidazolium trifluoromethylsulfonate (EMIMTfO) changes the aluminum solvation structure in the aqueous (Al(TfO)3) electrolyte to lower coordinated solvation shells, thereby influencing and improving Al deposition/stripping on the Zn/Al alloy anode. Furthermore, the addition of an IL reduces the strain in manganese oxide during intercalation/deintercalation, thereby improving the Zn/Al-MnOx battery performance. By optimizing the electrolyte composition, a battery potential of >1.7 V was achieved for the Zn/Al-MnOx system.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: American Chemical Society
ISSN: 2574-0962
Funders: UK�s HEC Materials Chemistry Consortium, which is funded by EPSRC (EP/R029431).
Date of First Compliant Deposit: 14 December 2023
Date of Acceptance: 17 October 2023
Last Modified: 15 Dec 2023 09:45

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