AI Article Synopsis
- Zinc aqueous batteries are safe, nontoxic, and cost-effective but face issues like limited rechargeability and short cycle life due to corrosion and dendrite formation.
- Researchers have improved battery performance by using ultrathin layers of covalent organic frameworks (COFs) on zinc electrodes, which act as protective films and enhance mass and charge transport.
- These modified batteries show excellent capacity retention and stable performance over prolonged cycling, and the COF films can be applied to various surfaces, paving the way for innovative battery designs like foldable types.
Article Abstract
Despite their safety, nontoxicity, and cost-effectiveness, zinc aqueous batteries still suffer from limited rechargeability and poor cycle life, largely due to spontaneous surface corrosion and formation of large Zn dendrites by irregular and uneven plating and stripping. In this work, these untoward effects are minimized by covering Zn electrodes with ultrathin layers of covalent organic frameworks, COFs. These nanoporous and mechanically flexible films form by self-assembly-via the straightforward and scalable dip-coating technique-and permit efficient mass and charge transport while suppressing surface corrosion and growth of large Zn dendrites. The batteries demonstrated have excellent capacity retention and stable polarization voltage for over 420 h of cycling at 1 mA cm . The COF films essential for these improvements can be readily deposited over large areas and curvilinear supports, enabling, for example, foldable wire-type batteries.
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| http://dx.doi.org/10.1002/adma.202101726 | DOI Listing |
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