采用溶胶-凝胶法合成了NASICON结构Na₃CrV（PO₄）₃@C钠离子电池正极材料，所包覆的碳源为聚乙烯吡咯烷酮（PVP-K30）和柠檬酸。通过XRD、Raman、XPS、TGA、SEM等对材料的结构组成和形貌进行表征，同时组装成扣式电池进行电化学性能测试，观察碳包覆对Na₃CrV（PO₄）₃正极材料电化学性能的改善情况。结果表明，碳包覆之后材料的比容量显著提高，当电压范围为1.3~4.3 V时，材料在1 C的倍率下循环100圈后拥有167 mA·h/g的放电比容量，在20 C大倍率下循环500圈后拥有90 mA·h/g的放电比容量。

NASICON-structured Na₃CrV(PO₄)₃@C cathode material for sodium-ion battery is synthesized by sol-gel method,and the coated carbon sources are polyvinylpyrrolidone (PVP-K30) and citric acid.The structure,composition and morphology of the material are characterized by XRD,Raman,XPS,TGA,SEM,etc.Meanwhile,the material is assembled into button cells to test the electrochemical performance and observe the improvement of electrochemical performance of Na₃CrV(PO₄)₃ cathode material after carbon coating.Test results show that the specific capacity of carbon coated material has been significantly improved.When the voltage is in the range of 1.3-4.3 V,the material delivers a discharge specific capacity of 167 mA·h·g^-1 after 100 cycles at a current density of 1 C,and a discharge specific capacity of 90 mA·h·g^-1 after 500 cycles at a high current density of 20 C.

张铭传(1996-),男,硕士研究生,研究方向为新能源材料,1773651732@qq.com