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Two-Step Carbon Coating and Zn/Si Codoping Engineering in Na3V2(PO4)3: Constructing a Porous-Structured Cathode for
Haoye Yuan1, Jinwang Feng1, Ning Li1
1School of Materials and Environment, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, Guangxi Colleges and Universities Key Laboratory of Eco-friendly Materials and Ecological Restoration, Guangxi Minzu University, Nanning 530105, P. R. China.
ACS Omega
|April 27, 2026
Summary
This study enhances sodium-ion battery cathodes using Zn/Si-codoped Na3V2(PO4)3 with dual carbon coating. The new material shows improved capacity and stability for practical energy storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Sodium-ion batteries (SIBs) face challenges with cathode materials like Na3V2(PO4)3 (NVP) due to low conductivity and instability.
- Improving NVP performance is crucial for advancing SIB technology.
Purpose of the Study:
- To develop a novel porous cathode material for SIBs by addressing the limitations of NVP.
- To enhance the electrochemical performance and stability of NVP-based cathodes.
Main Methods:
- Synthesized Zn/Si-codoped NVP with a two-step carbon coating (NZnVPSi/TC).
- Conducted electrochemical characterization, including rate capability and cycling stability tests.
- Fabricated and tested full cells to evaluate practical performance.
Main Results:
- Zn/Si codoping improved low current rate capacity; dual carbon coating enhanced high current rate performance.
- The NZnVPSi/TC cathode achieved 97.39 mAh g⁻¹ at 10.0 C with 90.3% retention after 2000 cycles.
- High rate performance showed 92.2 mAh g⁻¹ at 20.0 C with 91.2% retention after 2300 cycles; full cells demonstrated stability over 1400 cycles.
Conclusions:
- The developed NZnVPSi/TC material offers superior electrochemical performance and stability for SIBs.
- The synergistic effects of doping and carbon coating are key to enhancing conductivity and kinetics.
- This work presents a promising cathode material for practical sodium-ion battery applications.
