Related Experiment Video
Updated: Jun 5, 2025
06:58
Zinc-Sponge Battery Electrodes that Suppress Dendrites
Published on: September 29, 2020
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Reviving Zn Dendrites to Electroactive Zn2+ by Ion Sieve Interface
Zhenjie Liu1, Murong Xi1, Guanjie Li2
1State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi, Xinjiang, 830017, China.
Advanced Materials (Deerfield Beach, Fla.)
|December 11, 2024
Summary
A novel Li$_{2}$Zn$_{x}$Ti$_{3-x}$O$_{8}$ (LZTO) ionic sieve layer effectively suppresses zinc dendrites in zinc-metal anodes. This breakthrough enhances Zn$^{2+}$ diffusion, improving energy storage device lifespan and performance under demanding conditions.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Zinc dendrite formation hinders the practical application of zinc-metal anodes in energy storage.
- Existing dendrite suppression methods face limitations due to ion diffusion and concentration gradients.
Purpose of the Study:
- To introduce an in situ pre-zincation approach using a Li$_{2}$Zn$_{x}$Ti$_{3-x}$O$_{8}$ (LZTO) layer to mitigate zinc dendrites.
- To enhance Zn$^{2+}$ diffusion kinetics and improve the cycling stability of zinc anodes.
Main Methods:
- Fabrication of LZTO layer via in situ pre-zincation.
- In situ ion channel characterization and Zn$^{2+}$ migration pathway analysis.
- Electrochemical performance testing in coin and pouch cells under various conditions.
Main Results:
- The LZTO layer acts as an ionic sieve, converting Zn$^{0}$ dendrites back to Zn$^{2+}$ through redox reactions.
- Zn$^{2+}$ migration occurs along the (111) crystal plane of LZTO with a high transference number (0.796).
- LZTO@Zn anodes demonstrate improved performance at high currents, extended lifespan at low temperatures and in alkaline electrolytes, and enhanced cycling stability in lean electrolyte pouch cells.
Conclusions:
- The LZTO ionic sieve with ordered ion channels is crucial for suppressing zinc dendrites.
- This approach significantly enhances Zn$^{2+}$ transport, paving the way for reliable and high-performance zinc-metal batteries.
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