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Long-life potassium metal batteries enabled by anion-derived solid electrolyte interphase using concentrated ionic
Jiyun Jeon1, Seokbum Kang1, Bonhyeop Koo1
1Energy Science and Engineering, DGIST, Daegu 42988, Republic of Korea.
Journal of Colloid and Interface Science
|May 23, 2024
Summary
This study introduces a potassium salt-concentrated ionic liquid electrolyte (PCIL) for safer, long-lasting potassium metal batteries (PMBs). The PCIL electrolyte effectively suppresses dendrite growth, enhancing battery performance and safety.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Potassium metal batteries (PMBs) are promising next-generation energy storage systems.
- Challenges include potassium anode dendritic growth, impacting cycle life and safety.
Purpose of the Study:
- To develop a potassium salt-concentrated ionic liquid electrolyte (PCIL) for stable and safe PMBs.
- To investigate the electrolyte's properties and performance in K||KVPO4F cells.
Main Methods:
- Formulation of a PCIL using KFSI and Pyr13FSI.
- Electrochemical characterization including oxidation stability and ionic conductivity measurements.
- Cycling performance evaluation of PMBs at different temperatures.
Main Results:
- PCIL exhibits high oxidation stability (≈5.2 V), good ionic conductivity (4.0 mS cm⁻¹), and low flammability.
- Anion-derived solid-electrolyte interphase (SEI) formation effectively inhibits potassium dendrites.
- PMBs with PCIL show superior cycling performance (74.8% retention at 25°C, 82.9% at 45°C after 300 cycles) compared to conventional electrolytes.
Conclusions:
- PCIL is a viable electrolyte for realizing practical, long-life, and safe potassium metal batteries.
- The developed electrolyte promotes stable cycling through effective dendrite suppression and favorable interfacial kinetics.
Keywords:
Interfacial kineticsIonic liquid electrolytesKVPO(4)FPotassium metal batteriesSolid electrolyte interphaseMore Related Videos
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