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Highly reversible Zn anode with a practical areal capacity enabled by a sustainable electrolyte and superacid interfacial chemistry
- Source :
- Joule; May 2022, Vol. 6 Issue: 5 p1103-1120, 18p
- Publication Year :
- 2022
-
Abstract
- Aqueous zinc-metal batteries are plagued by poor Zn reversibility owing to zinc dendrite and layered double hydroxide (LDH) formation. Here, we introduce a novel additive—N,N-dimethylformamidium trifluoromethanesulfonate (DOTf)—in a low-cost aqueous electrolyte that can very effectively address these issues. The initial water-assisted dissociation of DOTf into triflic superacid creates a robust nanostructured solid-electrolyte interface (SEI)—revealed by operandospectroscopy and cryomicroscopy—which excludes water and enables dense Zn deposition. We demonstrate excellent Zn plating/stripping in a Zn||Cu asymmetric cell for more than 3,500 cycles. Furthermore, near 100% CE is realized at a combined high current density of 4 mA cm−2and an areal capacity of 4 mAh cm−2over long-term cycling. Zn||Zn0.25V2O5·nH2O full cells retain ∼83% of their capacity after 1,000 cycles with mass-limited Zn anodes. By restricting the depth of discharge, the cathodes exhibit less proton intercalation and LDH formation with an extended lifetime of 2,000 cycles.
Details
- Language :
- English
- ISSN :
- 25424351
- Volume :
- 6
- Issue :
- 5
- Database :
- Supplemental Index
- Journal :
- Joule
- Publication Type :
- Periodical
- Accession number :
- ejs59663091
- Full Text :
- https://doi.org/10.1016/j.joule.2022.04.017