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中文摘要：
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83．3mA·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％。
英文摘要：
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 83.3 mA· h/g can be obtained, and the first efficiency reaches about 90.3%, and the capacity retention is still 91.4% after 20 cycles.
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