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Aluminium deposition in EMImCl-AlCl3 ionic liquid and ionogel for improved aluminium batteries

Aluminium deposition in EMImCl-AlCl3 ionic liquid and ionogel for improved aluminium batteries
Aluminium deposition in EMImCl-AlCl3 ionic liquid and ionogel for improved aluminium batteries
Aluminium batteries with non-aqueous electrolyte have initially focused on Lewis acidic ionic liquid systems with heavy Al2Cl7-anions that limit the specific capacity, energy and power. In order to develop the secondary aluminium batteries further for future energy storage beyond lithium-ion, high performance electrolytes that enable efficient aluminium deposition/dissolution must be developed. This work studied the electrodeposition of aluminium from both 1-ethyl-3-methylimidazolium chloride aluminium chloride (EMImCl-AlCl3) ionic liquids with different Lewis acidities, and their gel form- the ionogel. Thereby, cyclic voltammetry, in-operando atomic force microscopy and scanning electron microscopy coupled with energy dispersive X-ray diffraction measurements were used to determine the characteristics of aluminium deposition in the ionic liquid depending on the ratio of AlCl3 to EMImCl. Based on these insights, Lewis acidic and neutral ionic liquids were gelified with polyethylene oxide. The focus was on the feasibility of aluminium deposition in Lewis neutral ionogels containing only lightweight AlCl4-anions. It was proven for the first time that aluminium can be deposited from a Lewis neutral ionogel without any dendrite growth within a very wide potential stability window of 5 V but at a low coulombic efficiency of ≤60%.
Aluminium deposition, EMImCl-AlCl3, Energy storage, batteries, ionic liquids, ionogel
0013-4651
Schoetz, Theresa
cf930a0a-087e-4be0-ac2b-614abcc3f424
Leung, Oi Man
91d04df0-5974-48ab-b05e-01b1e660ca47
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Zaleski, C.
69187cc7-0fff-450d-bede-32b7bd554631
Efimov, Igor
f6725be6-c62a-41a8-bd4e-d86b9ad10653
Schoetz, Theresa
cf930a0a-087e-4be0-ac2b-614abcc3f424
Leung, Oi Man
91d04df0-5974-48ab-b05e-01b1e660ca47
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Zaleski, C.
69187cc7-0fff-450d-bede-32b7bd554631
Efimov, Igor
f6725be6-c62a-41a8-bd4e-d86b9ad10653

Schoetz, Theresa, Leung, Oi Man, Ponce De Leon Albarran, Carlos, Zaleski, C. and Efimov, Igor (2020) Aluminium deposition in EMImCl-AlCl3 ionic liquid and ionogel for improved aluminium batteries. Journal of the Electrochemical Society, 167 (4), [040516]. (doi:10.1149/1945-7111/ab7573).

Record type: Article

Abstract

Aluminium batteries with non-aqueous electrolyte have initially focused on Lewis acidic ionic liquid systems with heavy Al2Cl7-anions that limit the specific capacity, energy and power. In order to develop the secondary aluminium batteries further for future energy storage beyond lithium-ion, high performance electrolytes that enable efficient aluminium deposition/dissolution must be developed. This work studied the electrodeposition of aluminium from both 1-ethyl-3-methylimidazolium chloride aluminium chloride (EMImCl-AlCl3) ionic liquids with different Lewis acidities, and their gel form- the ionogel. Thereby, cyclic voltammetry, in-operando atomic force microscopy and scanning electron microscopy coupled with energy dispersive X-ray diffraction measurements were used to determine the characteristics of aluminium deposition in the ionic liquid depending on the ratio of AlCl3 to EMImCl. Based on these insights, Lewis acidic and neutral ionic liquids were gelified with polyethylene oxide. The focus was on the feasibility of aluminium deposition in Lewis neutral ionogels containing only lightweight AlCl4-anions. It was proven for the first time that aluminium can be deposited from a Lewis neutral ionogel without any dendrite growth within a very wide potential stability window of 5 V but at a low coulombic efficiency of ≤60%.

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Accepted/In Press date: 3 February 2020
e-pub ahead of print date: 21 February 2020
Published date: March 2020
Keywords: Aluminium deposition, EMImCl-AlCl3, Energy storage, batteries, ionic liquids, ionogel

Identifiers

Local EPrints ID: 437844
URI: http://eprints.soton.ac.uk/id/eprint/437844
ISSN: 0013-4651
PURE UUID: 91d5df16-f3f9-4f2f-a9d2-47b4c075a226
ORCID for Oi Man Leung: ORCID iD orcid.org/0000-0002-1951-6811
ORCID for Carlos Ponce De Leon Albarran: ORCID iD orcid.org/0000-0002-1907-5913

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Date deposited: 20 Feb 2020 17:30
Last modified: 16 Sep 2021 11:14

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