An Mn-Enriched Interfacial Layer for Reversible Aqueous Mn Metal Batteries
Zhichao Hou1, Wenqiang Lu1, Hongbao Zheng1
1Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, P. R. China.
Nano Letters
|October 22, 2024
Summary
Researchers developed an Mn-enriched interfacial layer (Mn@MIL) for aqueous manganese metal batteries. This layer suppresses hydrogen evolution and dendrite growth, enhancing battery stability for grid storage.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Aqueous manganese metal batteries are attractive for stationary storage due to abundance and safety.
- Challenges include hydrogen evolution reaction (HER) and dendrite formation on the Mn anode, especially in low-concentration electrolytes.
- These issues hinder the practical application of manganese metal batteries.
Purpose of the Study:
- To address the challenges of HER and dendrite formation in aqueous manganese metal batteries.
- To improve the cycling stability and performance of Mn metal anodes in low-concentration electrolytes.
- To enhance the suitability of these batteries for grid-scale energy storage applications.
Main Methods:
- Constructed an Mn-enriched interfacial layer (Mn@MIL) on the Mn metal anode surface.
- Investigated the layer's role as a physical barrier and accelerator for Mn2+ diffusion.
- Tested Mn||Mn symmetric cells and Mn||V2O5 full cells with high mass loading in 1 M MnCl2 electrolyte.
Main Results:
- The Mn@MIL layer effectively suppressed the hydrogen evolution reaction (HER).
- Accelerated Mn2+ diffusion kinetics through the interfacial layer inhibited dendrite growth.
- Cells exhibited promising cycling stability with minimal polarization and parasitic reactions in low-concentration electrolyte.
Conclusions:
- The Mn@MIL interfacial layer is a viable strategy to overcome Mn anode limitations in aqueous electrolytes.
- This approach significantly enhances the performance and stability of manganese metal batteries.
- The findings support the potential of these batteries for practical grid energy storage.
Keywords:
Dendrite growthHydrogen evolution reactionLow-concentration electrolyteManganese metal anodeMn-enriched interfacial layerMore Related Videos
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