Compact Carbon-Based Ultra-High-Power Electrodes: A Sodium Alginate-Induced Self-Shrinkage and Densification Approach

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Achieving high volumetric energy density and power performance in energy storage devices is challenging.
• Densifying carbon materials improves energy density but often hinders electronic conductivity.
• Disrupted conductivity in densified carbon materials limits power performance.

Purpose of the Study:

• To develop a novel densification strategy for carbon-based electrodes.
• To overcome the trade-off between compact energy storage and high-power performance.
• To enhance volumetric power density in energy storage devices.

Main Methods:

• Utilized a sodium alginate (SA)-induced self-shrinkage densification strategy.
• Incorporated carbon quantum dots (CQDs) as spacers into graphene nanosheets.
• Crosslinked materials via carbonization of SA, promoting shrinkage and welded junctions.

Main Results:

• The developed reduced graphene oxide (rGO)/CQDs/SA-derived carbon film achieved a volumetric power density of 12307.7 W cm⁻³.
• Aqueous supercapacitors demonstrated a high volumetric power density of 349.5 W cm⁻³ at higher mass loading.
• The strategy enhanced specific surface area, electronic conductivity, and ion transport rate.

Conclusions:

• The SA-induced self-shrinkage densification strategy effectively creates compact, conductive carbon electrodes.
• This approach overcomes limitations of traditional densification methods in energy storage.
• Paves the way for advanced, ultra-high-power energy storage devices.