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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.
Abstract:
The practical application of Na3V2(PO4)3 (NVP) is impeded by its inherent limitations of low intrinsic electronic conductivity and structural instability. To address these challenges, this study develops a porous cathode material featuring two-step carbon coating and Zn/Si-codoped NVP (NZnVPSi/TC). Electrochemical characterization reveals that Zn/Si codoping effectively enhances the specific capacity at low current rates, whereas the two-step carbon coating significantly improves high current rate performance. Notably, the three-dimensional conductive network and porous architecture synergistically boost the electrochemical performance of NZnVPSi/TC by facilitating enhanced electronic/ionic conductivity and accelerating the reaction kinetics. Consequently, the NZnVPSi/TC cathode delivers a remarkable specific capacity of 97.39 mAh g-1 at 10.0 C, with a capacity retention of 90.3% after 2000 cycles. Furthermore, even at a high rate of 20.0 C, the NZnVPSi/TC cathode maintains a specific capacity of 92.2 mAh g-1, accompanied by an excellent capacity retention of 91.2% after 2300 cycles. Finally, the full cell exhibits impressive stability (over 1400 cycles at 2.0 C), which underscores its significant potential for sodium-ion battery applications.
