Tailoring Stress-Relieved Structure for SnSe Toward High Performance Potassium Ion Batteries.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Metal chalcogenides are promising anode materials for potassium ion batteries (PIBs) due to their high theoretical capacity.
• However, their practical application is limited by significant volume changes and poor cyclic stability during battery operation.

Purpose of the Study:

• To develop a stable and high-performance anode material for PIBs.
• To address the challenges of volume variance and poor cyclic stability in metal chalcogenide anodes.

Main Methods:

• Fabrication of a stress self-adaptive structure using ultrafine SnSe nanoparticles embedded in carbon nanofibers (SnSe@CNF).
• Utilized electrospinning technology for material synthesis.
• Characterized the electrochemical performance of the SnSe@CNF anode in PIBs.

Main Results:

• The SnSe@CNF architecture achieved a record specific capacity of 272 mAh g⁻¹ at 50 mA g⁻¹.
• Demonstrated high-rate performance with a capacity of 125 mAh g⁻¹ at 1 A g⁻¹.
• The ultrafine SnSe particles contributed to full material utilization and effective stress relief, mitigating chemo-mechanical degradation.

Conclusions:

• The developed SnSe@CNF structure significantly improves the performance of metal chalcogenides as PIB anodes.
• The stress self-adaptive design effectively alleviates volume expansion issues, leading to enhanced cyclic stability.
• This work provides a pathway for designing advanced anode materials for high-performance potassium ion batteries.