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<p>Zinc metal anode plays a vital role in aqueous zinc-ion batteries, while the continuous formation of zinc dendrites and the resultant detached dead zinc hinder the real use. Herein, a dead zinc reuse strategy is proposed by utilizing the reaction of redox mediator 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO). The shuttle reaction of TEMPO during the cycling processes enables the continuous reaction of dead zinc into active zinc ions. With the addition of TEMPO, Zn-Cu batteries demonstrate an average Coulomb efficiency of 99.5%. The Zn-MnO<sub>2</sub> full cell also exhibits remarkable cycle stability over 1500 cycles by adding TEMPO. This new approach proposed here to reactivate dead zinc promotes the advancement of the research of the long-life zinc metal batteries.</p>

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Leveraging the redox shuttle effect of TEMPO for the reactivation of dead zinc in aqueous zinc-ion batteries

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Qianhong Da,
  • Zhengze Dang,
  • Dan Liu,
  • Ziyi Kang,
  • Yunbo Zhang,
  • Peizhi Yang

摘要

Zinc metal anode plays a vital role in aqueous zinc-ion batteries, while the continuous formation of zinc dendrites and the resultant detached dead zinc hinder the real use. Herein, a dead zinc reuse strategy is proposed by utilizing the reaction of redox mediator 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO). The shuttle reaction of TEMPO during the cycling processes enables the continuous reaction of dead zinc into active zinc ions. With the addition of TEMPO, Zn-Cu batteries demonstrate an average Coulomb efficiency of 99.5%. The Zn-MnO2 full cell also exhibits remarkable cycle stability over 1500 cycles by adding TEMPO. This new approach proposed here to reactivate dead zinc promotes the advancement of the research of the long-life zinc metal batteries.