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Title: Copper hexacyanoferrate as a long-life cathode for aqueous aluminum ion batteries
Authors: Li, Xiaoya
Wu, Angyin
Gao, Caitian
Li, Zongkang
Lee, Seok Woo
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2023
Source: Li, X., Wu, A., Gao, C., Li, Z. & Lee, S. W. (2023). Copper hexacyanoferrate as a long-life cathode for aqueous aluminum ion batteries. Materials Today Energy, 31, 101205-.
Project: NRF2019-NRF-ANR052 KineHarvest 
Journal: Materials Today Energy 
Abstract: Aqueous aluminum ion batteries (AAIBs) have emerged as promising low-cost and energy-dense alternatives to conventional lithium-ion batteries. However, AAIBs exhibit a poor rate capability and limited cycle life owing to the rapid degradation. In this study, a copper hexacyanoferrate (CuHCFe) electrode was introduced into AAIBs with an aluminum trifluoromethanesulfonate aqueous electrolyte. Common aluminum electrolytes were compared to highlight the effects of anions and pure acid solutions were examined to eliminate the concerns on proton. A reversible capacity of 69.35 mAh/g was obtained at 70 mA/g, with 73% capacity maintained at 50 C, exhibiting excellent rate performance. Furthermore, the types of anions played an important role in the electrochemical performance. With triflate anions, the CuHCFe electrode exhibited remarkable cycling stability with a neglectable capacity loss in 3000 cycles (eight months of continuous testing) at 70 mA/g and 70% retention after 2300 cycles at 350 mA/g. Ex situ characterization revealed that both transition metals in CuHCFe were simultaneously involved in the redox reaction with minimal lattice change upon ion insertion/extraction. The results demonstrate the compatibility and potential of CuHCFe cathodes and aluminum triflate electrolytes for AAIBs, which can promote the development of such batteries for electrochemical energy storage.
ISSN: 2468-6069
DOI: 10.1016/j.mtener.2022.101205
Schools: School of Electrical and Electronic Engineering 
Rights: © 2022 Elsevier Ltd. All rights reserved. This paper was published in Materials Today Energy and is made available with permission of Elsevier Ltd.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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