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Rational Regulation of High-Voltage Stability in Potassium Layered Oxide Cathodes.
Lichen Wu1,2, Hongwei Fu1,2, Wang Lyu1,2
1School of Physics and Electronics, Hunan University, Changsha 410082, China.
ACS Nano
|May 10, 2024
Summary
Synergistic doping and in situ fluorine diffusion enhance layered oxide cathodes. This strategy suppresses manganese dissolution and oxygen loss, improving battery performance and cycle life for rechargeable batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Layered oxide cathodes face challenges like oxygen loss, phase transitions, and metal dissolution during high-voltage cycling.
- These issues significantly degrade electrochemical performance in rechargeable batteries.
Purpose of the Study:
- To address challenges in layered oxide cathodes by proposing synergistic doping and in situ electrochemical diffusion strategies.
- To improve the stability and electrochemical performance of potassium-ion layered oxide cathodes.
Main Methods:
- Synergistic doping with nonmetallic elements, specifically boron and fluorine.
- In situ electrochemical diffusion of fluorine into the bulk material after charging.
- Characterization of the modified K0.5Mn0.83Mg0.1Ti0.05B0.02F0.1O1.9 layered oxide cathode.
Main Results:
- Boron doping regulated fluorine distribution, enriching the surface and suppressing manganese dissolution.
- In situ fluorine diffusion reduced potassium ion diffusion energy barriers and inhibited oxygen loss.
- The modified cathode achieved a capacity of 147 mAh g⁻¹ at 50 mA g⁻¹ and 2200 cycles at 500 mA g⁻¹.
Conclusions:
- Synergistic doping and in situ electrochemical diffusion are effective strategies for optimizing layered oxide cathode materials.
- The findings provide valuable insights for designing advanced rechargeable battery materials with enhanced stability and performance.
Keywords:
high voltagelayered oxide cathodesnonmetallic elementsoxygen losspotassium-ion batteriessynergistic dopingMore Related Videos
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