Effect of Y³⁺Doping on the Sodium Storage Performance of Porous Na₃V₂(PO₄)₃/C Composites AITranslate

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Chinese Library Classification Number:TB34[一般工业技术—材料科学与工程]

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Y³⁺doped porous Na₃V₂(PO₄)₃/C(written as NVP/C)composites were successfully synthesized by a modified sol-gel combustion method.The structure and sodium storage performance of the composites were characterized by XRD,BET,SEM,HRTEM and electrochemical tests.The results show that Y³⁺with larger radius replaces part of V³⁺in NVP crystal structure,which leads to lattice expansion,expands the transport channel of Na⁺and accelerates the migration of Na⁺.In the process of preparing the modified samples,Y³⁺reacts with PO₄^3-to form a new conductive phase YPO₄,which improves the electronic conductivity of the composites.In addition,Y³⁺doping results in spheroidization of irregular polygonal NVP particles and a slight reduction in their size.Benefiting from the appropriate Y³⁺doping amount,uniform amorphous carbon coating layer and porous structure,the NVP/C-Y0.10 sample has excellent sodium storage performance with a high initial discharge specific capacity of 96.3 mA·h/g at a high rate of 5 C and a reversible capacity of 82.2 mA·h/g after 1000 cycles.