(湘潭大學(xué) 化學(xué)學(xué)院， 湘潭 411105)
摘 要: 采用高溫固相法合成摻雜改性的NaV1-xCrxPO4F(x=0, 0.04, 0.08)作為鈉離子電池正極材料。 通過紅外光譜(FT-IR)、 X射線衍射(XRD)和掃描電鏡(SEM)等對材料的晶體結(jié)構(gòu)和形貌進(jìn)行表征。 從材料的晶體結(jié)構(gòu)、 恒流充放電測試和循環(huán)性能等方面分析摻雜元素Cr在改善材料性能中的作用。 結(jié)果表明： 摻Cr后的材料電化學(xué)循環(huán)穩(wěn)定性得到較好的改善， 首次放電容量達(dá)到83.3 mA·h/g， 效率高達(dá)90.3%， 循環(huán)20次后可逆容量保持率仍然有91.4%。
關(guān)鍵字: 鈉離子電池； 高溫固相法； 正極材料； Cr摻雜； 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
