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Zn-Sn interface layer design strategy towards high-stability Zn powder anode.

Yan Xin1, Yunnian Ge1, Ming Lei1

  • 1Beijing Laboratory of New Energy Storage Technology and Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education, School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing, 102206, China. Huajun.Tian@ncepu.edu.cn.

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Researchers developed a Zn-Sn interface layer for zinc powder anodes in aqueous zinc-ion batteries (AZIBs). This innovation enhances stability and suppresses dendrite formation, paving the way for improved battery performance.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aqueous zinc-ion batteries (AZIBs) are promising energy storage devices.
  • Zinc powder anodes offer advantages like tunability and cost-effectiveness.
  • Challenges include side reactions and dendrite formation, limiting AZIB performance.

Purpose of the Study:

  • To develop a stable zinc powder anode for AZIBs.
  • To improve zinc deposition/stripping processes.
  • To enhance the overall electrochemical performance and cycle life of AZIBs.

Main Methods:

  • Fabrication of a Zn powder-based anode (ZnSn@ZP) with a Zn-Sn metal interface layer via electrodeposition.
  • Testing of symmetric ZnSn@ZP cells for cycling stability and voltage hysteresis.
  • Evaluation of ZnSn@ZP//Cu asymmetric cells for coulombic efficiency.
  • Assembly and testing of full cells with MnO2 cathodes.

Main Results:

  • The Zn-Sn interphase layer effectively suppressed anode corrosion and dendrite growth.
  • Symmetric ZnSn@ZP cells achieved over 1500 hours of cycling stability at 1 mA cm⁻².
  • Asymmetric cells demonstrated a high average coulombic efficiency of 99.6% over 2500 cycles.
  • Full cells with MnO2 cathodes showed stable cycling for 1800 cycles at 1 A g⁻¹.

Conclusions:

  • The developed Zn-Sn interface engineering strategy is effective, cost-efficient, and scalable.
  • This approach significantly enhances the stability and performance of zinc powder anodes in AZIBs.
  • The findings offer valuable insights for designing high-stability anodes for future AZIB applications.