Ultrastable Electrolytic Zn-I<sub>2</sub> Batteries Based on Nanocarbon Wrapped by Highly Efficient Single-Atom Fe-NC Iodine Catalysts.
basic_science · Level V
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- Record sourced from PubMed, PMID 38717804.
- Also identified by DOI 10.1002/adma.202404093.
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Abstract
Aqueous Zn-iodine (Zn-I<sub>2</sub>) conversion batteries with iodine redox chemistry suffers the severe polyiodide shuttling and sluggish redox kinetics, which impede the battery lifespan and rate capability. Herein, an ultrastable Zn-I<sub>2</sub> battery is introduced based on single-atom Fe-N-C encapsulated high-surface-area carbon (HC@FeNC) as the core-shell cathode materials, which accelerate the I<sup>-</sup>/I<sub>3</sub> <sup>-</sup>/I° conversion significantly. The robust chemical-physical interaction between polyiodides and Fe-N<sub>4</sub> sites tightly binds the polyiodide ions and suppresses the polyiodide shuttling, thereby significantly enhancing the coulombic efficiency. As a result, the core-shell HC@FeNC cathode endows the electrolytic Zn-I<sub>2</sub> battery with an excellent capacity, remarkable rate capability, and an ultralong lifespan over 60 000 cycles. More importantly, a practical 253 Wh kg<sup>-1</sup> pouch cell shows good capacity retention of 84% after 100 cycles, underscoring its considerable potential for commercial Zn-I<sub>2</sub> batteries.