Iron-doped nanoflakes of layered double hydroxide of nickel for high-performance hybrid zinc batteries

Sadegh Askari, Davide Mariotti, Paul Brunet, Alexander Vahl, Jan Benedikt

Research output: Contribution to journalArticlepeer-review

Abstract

Hybrid Zn-air and Zn-M (M represents transition metal oxide/hydroxide) batteries combined at the cell level take the advantages of Zn-air high-capacity and Zn-M high cell voltage. However, the performance of a Zn-air/M battery relies on finding a dual-functional cathode material, which can effectively serve both battery’s chemistries. Here we demonstrate the superior performance of a hybrid battery cathode based on Fe doped Ni double hydroxide nanoflakes and activated carbon material. Fe doping transforms the disordered crystal structure of Ni hydroxide to a stable hydrotalcite-type structure with significantly enhanced redox conversion capacity, improved electric conductivity and superior OER activity. Therefore, the hybrid battery exhibits a high total energy density, unprecedented energy conversion efficiency (87% at 4 mA cm-2) and superior power density (100 mW cm-2 at 60 mA cm-2) that outperforms reported hybrid batteries of other cathode materials. Moreover, the hybrid Zn-air/Ni1-xFex–LDH battery is featured with the capability of high-rate charging owing to the rapid kinetic of the redox reactions and the excellent catalytic activity of the cathode materials.
Original languageEnglish
Article number100879
Number of pages8
JournalMaterials Today Energy
Early online date11 Oct 2021
DOIs
Publication statusE-pub ahead of print - 11 Oct 2021

Keywords

  • Zinc battery
  • Nichel hydroxide
  • Layered double hydroxide
  • Hybrid zinc battery

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