Ion Sieve Interface Assisted Zinc Anode with High Zinc Utilization and Ultralong Cycle Life for 61 Wh/kg Mild Aqueous Pouch Battery.
basic_science · Level V
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- Record sourced from PubMed, PMID 38294411.
- Also identified by DOI 10.1021/acsnano.3c11115.
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Abstract
The cycling stability of a thin zinc anode under high zinc utilization has a critical impact on the overall energy density and practical lifetime of zinc ion batteries. In this study, an ion sieve protection layer (ZnSnF@Zn) was constructed <i>in situ</i> on the surface of a zinc anode by chemical replacement. The ion sieve facilitated the transport and desolvation of zinc ions at the anode/electrolyte interface, reduced the zinc deposition overpotential, and inhibited side reactions. Under a 50% zinc utilization, the symmetrical battery with this protection layer maintained stable cycling for 250 h at 30 mA cm<sup>-2</sup>. Matched with high-load self-supported vanadium-based cathodes (18-20 mg cm<sup>-2</sup>), the coin battery with 50% zinc utilization possessed an energy density retention of 94.3% after 1000 cycles at 20 mA cm<sup>-2</sup>. Furthermore, the assembled pouch battery delivered a whole energy density of 61.3 Wh kg<sup>-1</sup>, surpassing the highest mass energy density among reported mild zinc batteries, and retained 76.7% of the energy density and 85.3% (0.53 Ah) of the capacity after 300 cycles.