摘要
采用溶胶凝胶-高温固相法,用不同的钠源制备NASICON结构钠离子电池正极材料Na_3V_2(PO_4)_3.借助扫描电子显微镜(SEM),X射线衍射分析(XRD),电池测试系统及电化学工作站对制备的Na_3V_2(PO_4)_3结构,形貌,电性能和内阻进行表征.研究结果表明,以Na_2CO_3为钠源合成Na_3V_2(PO_4)_3有更好的颗粒尺寸,形貌结构完整,充放电性能及循环稳定性更好,阻抗也较小;在2.5~4.0 V电压范围内,以0.2C进行充放电,首次放电比容量达到110.8 m Ah/g,50次循环后容量保持率为85.1%.
Na3 Y2 （ PO4）3 structure cathode material of sodium ion battery of NASICON was synthesized under different sodium source via sol-gel and high temperature sintering method. The morphology, crystal structure, electrochemical performance and electrochemical impendance spectroscopy for Na3 V2 （ PO4）3 cathode material were characterized and tested by means of scanning electron microscopy （ SEM）, powder X-ray diffraction （ XRD）, galvanostatic charge-discharge tests and electrochemical workstation. The results show that Na2CO3 as a sodium source synthesized Na3 Y2 （ PO^has batter particle size, morphology and structure integrity. The best electrochemical performance and the smallest internal impedance are also obtained. The initial discharge specific capacity of the material is as high as 110.8 mAh/g at 0.2 C within the voltage range of 2.5？4.0 V, the capacity retention ratio is 85.1 % after 50 cycles.
出处
《有色金属科学与工程》
CAS
2017年第3期84-87,113,共5页
Nonferrous Metals Science and Engineering
基金
国家自然科学基金资助项目(51372104)
江西省科技计划项目(20141BBE50019)
