钠离子电池正极材料NaVPO_4F的合成及其电化学性能

Preparation and Performance of NaVPO_4F Cathode Material for Sodium-ion Battery

本文报道了在氩气保护下用两段高温固相反应法制备NaVPO4F作为钠离子电池正极材料,并用傅立叶红外光谱(FT-IR),原子吸收光谱(AAS),热重分析(TG/DTG),X-射线衍射(XRD),扫描电镜(SEM),恒流充放电等对其结构和性能进行了测试和表征。结果表明:750℃左右反应可以获得稳定、结晶度好的NaVPO4F,其晶型为简单单斜晶系,与前驱体VPO4的晶型一致;SEM测试表明NaVPO4F的粒径分布均匀,粒径大小在微米级,材料首次放电容量为87mAh/g。

In this paper, the cathode material of sodium-ion battery, NaVPO4F, was prepared under the protection of argon atmosphere by two step high temperature solid-state method. The structure and performance of the prepared cathode material were characterized by Flourier-Infrared Spectra （FT-IR）, Atomic Absorption Spectra （ AAS ）, Thermogravimetric Analysis （TG/DTG）, X-ray Diffractometer （XRD）, Scanning Electron Microscope （SEM） and constant current charge/discharge test. The results show that NaVPO4F with a good crystal stability can be obtained at about a temperature of 750 ℃. Its crystal structure was monoclinic, and it was in accordance with VPO4 precursor. The SEM micrograph showed that the size of NaVPO4 F particle was micron-class, and the distribution of particle was uniform, the initial discharge capacity of the material was 87mAh/g.