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Article Abstract
Anode-less Zn metal batteries (ALZMBs) enhance energy density but require ultrahigh Coulombic efficiency for stability, which is hindered by side reactions and dendrite growth. A uniform Zn stripping process is essential for improving Coulombic efficiency, but the impact of separator design on Zn stripping remains unexplored. Herein, we propose a novel strategy to achieve the high reversibility of Zn plating and stripping by modifying the glass fiber (GF) separator with hydrated titanic acid (HTO), forming an HTO@GF separator. Experimental and theoretical calculations indicate that highly electronegative oxygen in HTO promotes electron loss from Zn metal and converts it into Zn, thereby modulating the Zn stripping process. The HTO exhibits strong water adsorption capability, facilitating Zn desolvation, while its layered architecture provides abundant diffusion pathways for Zn. Consequently, Zn||Cu cells maintain 99.78% CE over 1500 cycles, and anode-less Cu||NaVO·1.5HO full cells operate for 800 cycles when using the HTO@GF separator.
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| http://dx.doi.org/10.1021/acs.nanolett.5c02642 | DOI Listing |
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