High-Efficiency Zinc-Metal Anode Enabled by Liquefied Gas Electrolytes

a-b. Voltage profile and corresponding CE during Zn plating/stripping testing in a Cu│Zn (10 mm) cell with 20% Zn utilization per cycle at room temperature (a) and -20°C (b) in liquefied gas electrolyte. c-d. TEM (c) and SEM (d) images for cycled Zn electrode. Zn anode samples were obtained from Zn|Zn symmetric cells at zero state of charge after 5 cycles with 0.5 mA cm–2, 0.5 mAh cm–2 per cycle.

Scientific Achievement

A liquefied gas electrolyte was developed for the 1st time for a bivalent chemistry. It displays an excellent Zn conductivity (>3.4 mS cm-1) across a broad temperature range (-60 to +20 °C), enables highly reversible Zn cycling with no evidence of shorting behavior at both room temperature and -20 °C for over 200 cycles (>400 h) with a high Coulombic efficiency (CE > 99%) at high utilization (20% Zn per cycle) for Zn  plating/stripping at both room temperature and -20°C.

Significance and Impact

This is a promising new direction to achieve a highly reversible Zn metal anode supporting high energy density rechargeable Zn metal batteries across a wide temperature range for Zn metal anode and Zn||Na2V6O16·1.63H2O full cells.

Research Details

  • The effect of this liquefied gas electrolyte on the Zn interphasial structure and chemistries was investigated using sputtering XPS, TEM-EDX and DFT calculations.

Combining sputtering XPS, TEM, XRF and DFT calculation, we revealed the potential capacity resource in this liquefied gas electrolyte when paired with Na2V6O16·1.63H2O as cathode

Download this highlight 


Latest Updates

See All