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An Aqueous Al-Ion Battery Boosted by Triple-Ion Intercalation Chemistry with a High-Energy MnAl 2O 4 Nanosphere Cathode

44 Pages Posted: 20 Apr 2020 Sneak Peek Status: Review Complete

See all articles by Wending Pan

Wending Pan

The University of Hong Kong - Department of Mechanical Engineering

Jianjun Mao

The University of Hong Kong - Department of Mechanical Engineering

Y.F. Wang

The University of Hong Kong - Department of Mechanical Engineering

X. Zhao

The University of Hong Kong - Department of Mechanical Engineering

Y.G. Zhang

The University of Hong Kong - Department of Mechanical Engineering

Yue Chen

The University of Hong Kong - Department of Mechanical Engineering

Dennis Y. C. Leung

The University of Hong Kong - Department of Mechanical Engineering

More...

Abstract

AlCl3 "water-in-salt" electrolyte has successfully expanded the electrochemical window of aqueous Al-ion battery to 4 volts, however, the limited Al intercalation capacity of graphite (165 mAh g-1 ) preclude higher energy density. A high-energy MnAl2O4 cathode was synthesized by a simple two-step hydrothermal method, which can utilize triple-ion intercalation chemistry to achieve a high specific capacity of 330 mAh g-1 with an average discharge voltage of 1.68V versus Al/Al3+ (a record energy density of 555 Wh kg-1 ). Besides, a higher discharge capacity of 830 Wh kg-1 was achieved with higher-concentration electrolyte, showing a potential capacity for cation intercalation. Unique triple-ion intercalation chemistry was firstly investigated thoroughly. Experimental characterization attributes this high voltage to the intercalation of anions, e.g., AlCl4- and Cl- , and Cl- was also revealed an interaction function with intercalated Al3+ cations, which can benefit the design of Aluminium-ion batteries (AIBs) in the future.

Keywords: Aluminium-ion battery, Aqueous Al-ion battery, AlCl3 "water-in-salt" electrolyte, MnAl2O4 nanosphere cathode, High-energy cathode, Triple-ion intercalation chemistry, Intercalation of anions.

Suggested Citation

Pan, Wending and Mao, Jianjun and Wang, Y.F. and Zhao, X. and Zhang, Y.G. and Chen, Yue and Leung, Dennis Y. C., An Aqueous Al-Ion Battery Boosted by Triple-Ion Intercalation Chemistry with a High-Energy MnAl 2O 4 Nanosphere Cathode. Available at SSRN: https://ssrn.com/abstract=3569552 or http://dx.doi.org/10.2139/ssrn.3569552
This is a paper under consideration at Cell Press and has not been peer-reviewed.

Wending Pan

The University of Hong Kong - Department of Mechanical Engineering ( email )

China

Jianjun Mao

The University of Hong Kong - Department of Mechanical Engineering

China

Y.F. Wang

The University of Hong Kong - Department of Mechanical Engineering ( email )

China

X. Zhao

The University of Hong Kong - Department of Mechanical Engineering ( email )

China

Y.G. Zhang

The University of Hong Kong - Department of Mechanical Engineering ( email )

China

Yue Chen

The University of Hong Kong - Department of Mechanical Engineering

China

Dennis Y. C. Leung (Contact Author)

The University of Hong Kong - Department of Mechanical Engineering ( email )

China

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