Ternary Potassium-Bismuth-Telluride Intermetallic Support Promotes Electrochemical Stability in Potassium Metal
Rohit Raj1, Yixian Wang1, Dean Yen2
1Materials Science and Engineering Program, Walker Department of Mechanical Engineering and Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA.
Angewandte Chemie (International Ed. in English)
|June 5, 2025
Summary
Researchers developed a novel potassium-bismuth-telluride (KBT) intermetallic composite for advanced potassium metal batteries (KMBs). This KBT material enables stable cycling and improved battery performance, paving the way for next-generation energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Potassium metal batteries (KMBs) offer high energy density but face challenges with dendrite formation and interfacial instability.
- Developing stable electrode materials and electrolytes is crucial for improving KMB cycle life and safety.
Purpose of the Study:
- To fabricate and characterize a novel potassium-bismuth-telluride (KBT) intermetallic composite for KMB applications.
- To investigate the electrochemical performance and interfacial properties of KBT-based KMBs.
Main Methods:
- Accumulative roll bonding (ARB) for composite fabrication.
- Symmetric cell testing and full KMB cycling.
- Synchrotron X-ray nano-tomography, Cryo-FIB, and XPS for interfacial analysis.
- Multiscale simulations for mechanistic insights.
Main Results:
- A new, thermodynamically stable KBT intermetallic (fcc antifluorite K2Te archetype) was synthesized.
- Symmetric cells demonstrated 880 hours of stable cycling.
- KMBs with PB or organic cathodes showed 80% capacity retention after 200-900 cycles.
- Advanced microscopy revealed uniform electrodeposits and suppressed dendrite formation.
Conclusions:
- The KBT intermetallic composite significantly enhances the stability and performance of KMBs.
- The KBT material promotes uniform potassium electrodeposition and stable solid electrolyte interphase (SEI) formation.
- This work provides a promising material and strategy for developing high-performance KMBs.
Keywords:
Accumulative roll bondingDendritePotassium ion batteryPotassium metal battery (KMB)Solid electrolyte interphase (SEI)More Related Videos
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