A Novel Potassium-Ion-Based Dual-Ion Battery

Area of Science:

• Electrochemistry
• Materials Science
• Energy Storage

Background:

• Potassium-ion batteries and dual-ion batteries offer distinct advantages for energy storage.
• Developing high-performance, cost-effective, and environmentally friendly battery systems is crucial.

Purpose of the Study:

• To develop a novel potassium-ion-based dual-ion battery (K-DIB) system.
• To evaluate the electrochemical performance and energy density of the K-DIB using tin foil as an anode.

Main Methods:

• A potassium-ion electrolyte was employed with expanded graphite as the cathode and metal foils (Sn, Pb, K, Na) as the anode.
• Electrochemical performance was tested using tin foil as the anode, focusing on reversible capacity, cycling stability, and energy density.

Main Results:

• The K-DIB with Sn foil anode achieved a reversible capacity of 66 mAh g⁻¹ at 50 mA g⁻¹ over 3.0-5.0 V.
• It demonstrated excellent long-term cycling with 93% capacity retention over 300 cycles.
• The integrated Sn anode and current collector design improved energy density to 155 Wh kg⁻¹ at 116 W kg⁻¹.

Conclusions:

• The developed K-DIB system exhibits high energy density and stable cycling performance, comparable to commercial lithium-ion batteries.
• The use of tin foil as both anode and current collector enhances energy density by reducing dead load and volume.
• The K-DIB presents an attractive, cost-effective, and environmentally friendly option for future energy storage applications.