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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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Durable Potassium Storage Achieved by Boron Coordination in a P2-Type Layered Oxide Skeleton
Zhuangzhuang Zhang1, Yaru Qiao1, Yong-Li Heng2
1Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions (Ministry of Education), School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China.
Nano Letters
|April 11, 2025
Summary
Researchers improved potassium-ion battery cathodes by adding boron to transition-metal oxides. This enhances structural stability and ion movement, leading to better performance and longer battery life.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Layered transition-metal (TM) oxides are promising cathodes for high-energy-density potassium (K)-ion batteries.
- However, poor TM-O bond covalency causes TM migration and structural degradation, limiting battery performance and cycle life.
Purpose of the Study:
- To enhance the structural stability and electrochemical performance of layered K-ion battery cathodes.
- To investigate the effect of boron coordination chemistry on TM-O bond covalency and K+ ion diffusion.
Main Methods:
- Synthesized a prototype P2-layered K0.5Mn0.8Ni0.15B0.05O2 (KMNBO) cathode material incorporating boron.
- Analyzed the local electronic structure and bonding characteristics using computational methods.
- Evaluated the electrochemical performance, including rate capability and cycle stability, through battery testing.
Main Results:
- Boron incorporation significantly boosted TM-O covalency by attracting electron density around oxygen.
- The modified layered structure exhibited enhanced tolerance to K-ion (de)intercalation, suppressing TM migration.
- Reduced Coulombic forces between K and O facilitated sluggish K+ ion migration, improving rate performance.
Conclusions:
- Boron coordination chemistry offers a novel strategy to stabilize layered cathodes for potassium-ion batteries.
- This approach overcomes limitations of TM migration and structural instability, paving the way for durable high-energy-density K-ion batteries.
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