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Electrode-Less MnO2 -Metal Batteries with Deposition and Stripping Chemistry
Mingming Wang1, Na Chen2, Zhengxin Zhu2
1Department of Chemistry, School of Chemistry and Materials Science, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, China.
Small (Weinheim an Der Bergstrasse, Germany)
|September 29, 2021
Summary
New electrode-less batteries using manganese dioxide (MnO2) and metal components offer facile fabrication and high performance. These advanced batteries demonstrate exceptional cycle life and energy densities, promising for electric vehicles and grid storage.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Traditional battery manufacturing involves complex electrode preparation, hindering large-scale production.
- Solid-state electrodes and separators increase fabrication complexity and cost.
Purpose of the Study:
- To develop facilely fabricated, electrode-less batteries.
- To explore dual-deposition/stripping chemistries for enhanced battery performance.
- To present novel manganese dioxide (MnO2)-metal battery systems.
Main Methods:
- Fabrication of static electrode-less MnO2-metal batteries using carbon current collectors and electrolytes.
- Utilizing dual-deposition/stripping chemistries: Mn2+/MnO2 (cathode) and M/Mx+ (anode).
- Testing MnO2-Cd, MnO2-Zn, and MnO2-Cu battery performance.
Main Results:
- MnO2-metal batteries achieved high rates up to 200 C.
- Demonstrated excellent reversibility with 15,000 cycles.
- Reported realistic energy densities: 93.7 Wh kg-1 (gravimetric) and 134 Wh L-1 (volumetric).
- The MnO2-Cd battery exceeded 160,000 cycles in high current pulse tests.
Conclusions:
- Electrode-less MnO2-metal batteries offer a simplified fabrication process.
- These batteries show significant potential for electric vehicle start-stop applications and large-scale energy storage.
- The demonstrated cycle life and energy density highlight the viability of this novel battery design.
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