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Breaking the Thermodynamic Ceiling of Aqueous Selenium Chemistry via Intrinsic Mn Cation Modulation
Yuxin Sun1, Wenqiang Lu2, Zhichao Hou1
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.
Researchers developed a novel aqueous manganese-selenium battery, overcoming limitations of selenium cathodes in water. This high-energy storage solution achieves remarkable stability and capacity through unique manganese chemistry.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Aqueous conversion-type batteries offer safe, low-cost, high-energy storage potential.
- Selenium (Se) cathodes face challenges due to redox potential mismatch with aqueous electrolytes.
Purpose of the Study:
- To develop the first aqueous manganese-selenium battery overcoming electrolyte stability limitations.
- To enable high-reversibility multi-electron reactions for enhanced energy storage.
Main Methods:
- Utilized intrinsic hydrolysis acidity of Mn-based cations to stabilize aqueous electrolytes.
- Investigated the role of electrolyte anions (Cl-, OTf-) in regulating reaction pathways.
- Characterized the dual-phase conversion between Se, MnSe, and MnSe2.
Main Results:
- Achieved a high initial capacity of 621 mAh g-1 in the Mn-Se battery.
- Demonstrated exceptional cycling stability, retaining 501 mAh g-1 after 1200 cycles.
- Reached a record energy density of 414 Wh kg-1 for aqueous manganese-metal batteries.
Conclusions:
- The Mn-Se battery design overcomes Se cathode limitations in aqueous systems.
- Electrolyte anion choice is critical for interface stabilization and reaction pathway control.
- This work offers insights for designing high-reversibility conversion-type cathode materials.
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