Na4MnV(PO4)3 (NMVP) cathode materials have attracted significant attention as potential candidates for grid applications due to their distinctive structure and high theoretical capacity. However, their inadequate electronic conductivity compromises both cycling stability and rate capability, presenting a challenge for practical implementation. To address this issue, we employed a strategy involving Zr4+ doping and dual-carbon coating to enhance the electrochemical performance of NMVP. The resulting Na3.8MnV0.8Zr0.2( PO4)3/C/rGO composite demonstrated markedly improved rate capability (71.9 mAh g− 1 at 60 °C) and sustained cyclic stability (84.8% retention at 2 C after 1000 cycles), as validated through comprehensive kinetics assessments. The enhanced performance can be attributed to the expanded Na-ion pathways facilitated by large size ion doping and the improved electronic conductivity enabled by the dual-layer coating.

Na3.8MnV0.8Zr0.2(PO4)3CrGO composite cathode for sodium-ion battery with enhanced cycling stability and rate capability
    Abstract
    1 Introduction
    2 Experiment detail
        2.1 Material synthesis
        2.2 Material characteristics
    3 Results and discussion
    4 Conclusion
    Acknowledgements 
    References

• Lei Zheng(Hubei Three Gorges Laboratory, Yichang, Hubei 443007, People’s Republic of China)
• Ao Tang(Hubei Three Gorges Laboratory, Yichang, Hubei 443007, People’s Republic of China, Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, People’s Republic of China)
• Xiaofei Gong(Hubei Three Gorges Laboratory, Yichang, Hubei 443007, People’s Republic of China)
• Chaoqun Shang(Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, People’s Republic of China)
• Pu Hu(Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, People’s Republic of China) Corresponding author