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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Developing resilient aqueous energy storage systems like zinc (Zn) batteries is crucial for energy sustainability.
  • Metal dendrite growth in Zn batteries leads to poor rechargeability, hindering electrode performance.
  • Classical theory predicts dendrite formation limits charging rates based on electrolyte transport (J_lim).

Purpose of the Study:

  • To investigate the electrochemical behavior of Zn metal dendrites under varying discharge rates.
  • To challenge the conventional understanding of dendrite limitations in fast-charging metal electrodes.
  • To explore new design principles for enhancing reversibility and cycle life in high-rate metal batteries.

Main Methods:

  • Operando visualization techniques to observe dendrite dynamics during charge-discharge cycles.
  • Post-mortem microstructural analysis to examine dendrite morphology and failure mechanisms.
  • Electrochemical testing to correlate discharge rates with charge-discharge reversibility and cycle life.

Main Results:

  • Achieved near-unity charge-discharge reversibility even with highly ramified Zn dendrites.
  • Demonstrated a strong positive correlation between increasing discharge rate and improved reversibility.
  • Observed a ~200x enhancement in cycle life when discharging at higher rates versus lower rates.

Conclusions:

  • High discharge rates suppress dendrite fragmentation by promoting stable tip-initiated retraction, contrary to expectations.
  • Low discharge rates induce pitting corrosion, weakening dendrite structures and causing fragmentation.
  • Findings challenge the assumption that dendrites inherently limit reversibility, offering new design strategies for high-rate metal batteries.