Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第16卷    第7期    总第88期    2006年7月

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文章编号: 1004-0609(2006)07-1276-05
NaV1-xCrxPO4F的合成及电化学性能
卓海涛, 王先友, 唐安平, 刘志明

(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%。

 

关键词:  钠离子电池; 高温固相法; 正极材料; Cr掺杂; 氟磷酸化合物

Synthesis and electrochemical performance of NaV1-xCrxPO4F
ZHUO Hai-tao, WANG Xian-you, TANG An-ping, LIU Zhi-ming

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 83.3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.

 

Key words: sodium-ion battery; high temperature solid-state method; cathode material; Cr-dopants; fluorophosphate compound

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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