Disordered 3 D Multi-layer Graphene Anode Material from CO2 for Sodium-Ion Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Energy

Background:

• Sodium-ion batteries (SIBs) are a promising alternative to lithium-ion batteries for large-scale energy storage.
• Developing sustainable and high-performance anode materials is crucial for advancing SIB technology.
• Carbon dioxide (CO2) utilization presents an opportunity for environmentally friendly material synthesis.

Purpose of the Study:

• To synthesize disordered 3D multi-layer graphene directly from CO2 gas.
• To evaluate the performance of this graphene material as an anode for SIBs.
• To explore the potential of CO2-derived graphene in mitigating CO2 emissions.

Main Methods:

• Synthesis of disordered 3D multi-layer graphene via reaction of CO2 with Li at 550°C.
• Electrochemical characterization including galvanostatic cycling and rate capability tests.
• Material analysis using Raman spectroscopy and small-angle X-ray scattering.

Main Results:

• The synthesized graphene exhibited a reversible capacity of ~190 mAh/g with 98.5% Coulombic efficiency at 15 mA/g.
• Discharge capacity was attributed to Na-ion adsorption at defect sites and intercalation between graphene sheets.
• The electrode demonstrated excellent rate capability and cyclability.

Conclusions:

• Disordered 3D multi-layer graphene synthesized from CO2 is a viable anode material for SIBs.
• This approach offers a sustainable pathway for both energy storage and CO2 emission mitigation.
• The material's performance highlights its potential for next-generation battery technologies.