Fluorinated Surface Engineering Towards High-Rate and Durable Potassium-Ion Battery

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• The solid electrolyte interphase (SEI) is critical for potassium-ion battery performance.
• Research into SEI formation and its impact on battery longevity is ongoing.
• Optimizing SEI properties is key to developing high-performance potassium-ion batteries.

Purpose of the Study:

• To investigate the effect of fluorinated surface design on SEI formation in potassium-ion batteries.
• To develop an ultra-thin and KF-enriched SEI for improved battery characteristics.
• To enhance the rate capability and cycling stability of potassium-ion batteries.

Main Methods:

• Electrode surface fluorination engineering.
• Characterization of SEI composition and morphology.
• Electrochemical performance testing, including capacity, rate capability, and cycling stability.

Main Results:

• Achieved an ultra-thin, uniform, and KF-enriched SEI.
• Demonstrated significantly improved specific capacity (439.3 mAh g⁻¹).
• Showcased boosted rate performance (202.3 mAh g⁻¹ at 8.70 mA cm⁻²) and durable cycling.

Conclusions:

• Fluorination engineering effectively regulates SEI formation for superior potassium-ion battery performance.
• The KF-enriched SEI contributes to enhanced electronic conductivity and potassium adsorption.
• This approach offers a practical strategy for advancing potassium-ion battery development.