(湘潭大学 化学学院， 湘潭 411105)
摘 要: 采用高温固相法合成掺杂改性的NaV1-xCrxPO4F(x=0, 0.04, 0.08)作为钠离子电池正极材料。 通过红外光谱(FT-IR)、 X射线衍射(XRD)和扫描电镜(SEM)等对材料的晶体结构和形貌进行表征。 从材料的晶体结构、 恒流充放电测试和循环性能等方面分析掺杂元素Cr在改善材料性能中的作用。 结果表明： 掺Cr后的材料电化学循环稳定性得到较好的改善， 首次放电容量达到83.3 mA·h/g， 效率高达90.3%， 循环20次后可逆容量保持率仍然有91.4%。
关键字: 钠离子电池； 高温固相法； 正极材料； Cr掺杂； 氟磷酸化合物
（College of Chemistry, Xiangtan University, Xiangtan 411105, China）
Abstract: NaV1-xCrxPO4F(x=0, 0.04, 0.08) doped with Cr used for cathode of sodium-ion batteries was prepared by the high temperature solid-phase method. The structure and morphology of cathode materials were characterized by Flourier-infrared spectra (FT-IR), X-ray diffractometer (XRD) and scanning electron microscope (SEM).The effects of the Cr doping on the crystal structure, charge-discharge curves and cycle performances improvement of materials were analyzed. The results show that the as-prepared Cr-doped materials have better cycle stability characterization than the undoped one, the initial reversible capacity of 83.3mA·h/g can be obtained, and the first efficiency reaches about 90.3%, and the capacity retention is still 91.4% after 20 cycles.
Key words: sodium-ion battery; high temperature solid-state method; cathode material; Cr-dopants; fluorophosphate compound
