水热-溶胶-凝胶法制备钠离子电池正极材料 Na3V2(PO4)3/C 及其性能研究.

Na3V2(PO4)3/C as cathode materials for sodium ion batteries were synthesized by sol-gel method and hydrothermal-sol-gel method respectively.The samples were characterized by XRD, SEM, constant current charge and discharge. The results show that Na3V2(PO4)3/C materials synthesized by sol-gel method and hydrothermal-sol-gel method at all temperatures were pure phase with porous structure. The Na3V2(PO4)3/C sample prepared by the hydrothermal-sol-gel method had smaller particle size. It was more conducive to the deintercalation of sodium ions,which could improve the electrochemical performance of the material. The initial sample prepared by the conventional sol-gel method exhibited a first discharge specific capacity of 98.3 and 31.3 mAh/g at 0.1 and 2 Crates. The initial discharge specific capacity at 2 Crate was as high as 111.9 and 94.1 mAh/g, and the electrochemical performance was significantly improved. [ABSTRACT FROM AUTHOR]