High performance Li-ion capacitor fabricated with dual graphene-based materials

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium-ion capacitors (LICs) bridge the gap between supercapacitors and lithium-ion batteries.
• Existing energy storage solutions face limitations in energy density or power delivery.

Purpose of the Study:

• To design and fabricate novel LICs using graphene-modified phenolic resin.
• To evaluate the electrochemical performance of these all-graphene-based LICs.

Main Methods:

• Fabrication of graphene-modified phenolic resin for both cathode and anode.
• Electrochemical characterization including cycling stability, rate capability, and energy/power density measurements.

Main Results:

• Graphene-enhanced electrodes exhibited high specific capacity and good cycling stability.
• The all graphene-based LICs achieved a high working voltage of 4.2 V.
• Demonstrated high energy density (142.9 Wh kg⁻¹) and power density (12.1 kW kg⁻¹).
• Achieved 88% capacity retention after 5000 cycles.

Conclusions:

• The developed LICs offer a promising solution for advanced energy storage.
• The facile preparation and high performance make these devices suitable for various applications.
• Graphene modification is key to enhancing electrode performance in LICs.