Tin negative electrodes using an FSA-based ionic liquid electrolyte: improved performance of potassium secondary...

Area of Science:

• Electrochemistry
• Materials Science
• Energy Storage

Background:

• Potassium secondary batteries are a promising alternative to lithium-ion batteries.
• Developing stable and high-performance negative electrode materials is crucial for potassium battery advancement.
• Tin-based materials offer high theoretical capacity but face challenges with volume expansion and cycling stability.

Purpose of the Study:

• To investigate the performance of submicron-sized tin particles as a negative electrode material for potassium secondary batteries.
• To evaluate the electrochemical stability and capacity retention of tin electrodes using a specific ionic liquid electrolyte.

Main Methods:

• Submicron-sized tin particles were synthesized and characterized.
• Electrochemical performance was tested in a potassium secondary battery configuration.
• A bis(fluorosulfonyl)amide-based ionic liquid electrolyte, K[FSA]-[C3C1pyrr][FSA], was employed.
• Cycling stability was assessed over 100 cycles at room temperature.

Main Results:

• The tin negative electrodes demonstrated good electrochemical performance.
• An improved capacity retention exceeding 170 mA h (g-Sn)-1 was achieved after 100 cycles.
• The use of the K[FSA]-[C3C1pyrr][FSA] ionic liquid electrolyte contributed to enhanced electrode stability.

Conclusions:

• Submicron tin particles are a viable negative electrode material for potassium secondary batteries.
• The developed ionic liquid electrolyte system significantly improves the cycling performance and stability of tin electrodes.
• This research contributes to the development of next-generation potassium battery technologies.