Research on Na3.3La0.3Zr1.7Si2PO12 nanofiber based composite solid electrolyte
Na3.3La0.3Zr1.7Si2PO12(NLZSP)nanofibers were prepared by electrospinning,and the effects of polymer content in the precursor solution and heat treatment temperature on the microstructure,crystal structure and electrochemical properties of the nanofibers were studied.NLZSP nanofibers treated at 800 ℃ for 4 h with a mass ratio of PVP of 6％in the precursor solution have high purity,high crystallinity,uniform fiber size and smooth surface.The ionic conductivity of PEO(NaClO4)com-posite polymer electrolyte(CPE)prepared based on NLZSP nanofibers reached 3.3×10-4 S/cm at room temperature,while the ionic conductivity of PVDF-HFP(NaClO4)based CPE reached 3.24×10-4 S/cm.The activation energy is only 0.24 eV,and the electrochemical stability window can reach more than 5 V,showing excellent electrochemical performance and stability.The initial discharge capacity of solid state sodium metal battery based PVDF-HFP-NaClO4-NLZSP nanofibers CPE,Na4MnCr(PO4)3@C cathode can reach 106.2 mAh/g at 0.1 C,and the capacity retention rate is 94.8％after rate cycle.Be-sides,the capacity retention rate was as high as 85.4％after 100 cycles at 2 C ratio,showing good cycle stability.
Na3.3La0.3Zr1.7Si2PO12nanofiberscomposite solid electrolytesodium ion battery
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