A Ca-Ion Electrochromic Battery via a Water-in-Salt Electrolyte
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Article number | 2104639 |
Journal / Publication | Advanced Functional Materials |
Volume | 31 |
Issue number | 41 |
Online published | 14 Jul 2021 |
Publication status | Published - 8 Oct 2021 |
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Abstract
Multivalent-ion batteries with electrochromic functionality are an emerging green technology for development of low-carbon society. Compared to Mg2+, Zn2+ and Al3+, Ca2+ has a low polarization strength similar to that of Li+, therefore Ca2+ for electrochromism and battery can avoid kinetic issues caused by other multivalent-ions with high polarization strength. Here, by exploiting Ca-ion carriers for electrochromism and a water-in-salt (WIS) Ca(OTF)2 electrolyte for the first time, a new and safe aqueous Ca-ion electrochromic battery (CIEB) has been demonstrated. The WIS Ca(OTF)2 electrolyte demonstrates enhanced anion-cation interactions and decreased water activity. Vanadium oxide (VOx) and indium hexacyanoferrate (InHCF) films are respectively developed as anode and cathode because of their stable and high-rate Ca2+ insertion/extraction, as well as matched electrochromism. The CIEB demonstrates a stable and high-rate capability, a high energy density of 51.4 mWh m−2 at a power density of 1737.3 mW m−2, and a greenish yellow-to-black electrochromism. The presented results are beneficial for understanding redox kinetics in WIS electrolytes, and inspire researches on batteries and electrochromism with multivalent-ions.
Research Area(s)
- aqueous batteries, Ca-ion redox, electrochromic batteries, multivalent-ion charge carrier, water-in-salt electrolytes
Citation Format(s)
A Ca-Ion Electrochromic Battery via a Water-in-Salt Electrolyte. / Tong, Zhongqiu; Kang, Tianxing; Wan, Yingpeng et al.
In: Advanced Functional Materials, Vol. 31, No. 41, 2104639, 08.10.2021.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review