The fast ionic conductive inorganic particles of Na3Zr2Si2PO12 (NZSPO) were introduced into polypropylene fine (PAN) nanofibers and used to form the three-dimensional fiber network-reinforced bicontinuous solid electrolyte composites of NZSPO/PAN-[PEO-NaTFST] via the electrospinning method. When the mass ration of NZSPO∶PAN was regulated at 2∶1, a maximum ionic conductivity at room temperature arrived at 3.38×10-5 s/cm, and its electrochemical stability window can be expanded to 4.4 V. Na3V2(PO4)3 and metal Na were adopted as the cathode and anode to assemble an all solid-state sodium-on battery. The reversible capacity of the first cycle was 109.7 mA·h·g-1, which can be maintained at 84.5 mA·h·g-1 after 200 cycles with a high coulomb efficiency near 100% at 0.1 C. Differential scanning calorimetry curves confirmed that the NZSPO-PAN composite fiber can inhibit the crystallization of PEO polymer and accelerate the process of ion transport kinetics at low temperatures.
LIU Dangling. Properties of three-dimensional NZSPO/PAN-［PEO-NATFST］ sodium-battery-composite solid electrolyte[J]. Energy Storage Science and Technology, 2021, 10(3): 931-937
图2
(a, b) 纯纺PAN的SEM图；(c, d) Na3Zr2Si2PO12∶PAN质量比为1∶1的SEM图；(e, f) Na3Zr2Si2PO12∶PAN质量比为2∶1SEM图；(g, h) Na3Zr2Si2PO12∶PAN质量比为3∶1的SEM图
Fig. 2
(a, b) SEM image of pure spinning PAN; (c, d) SEM image of Na3Zr2Si2PO12∶PAN(1∶1); (e, f) SEM image of Na3Zr2Si2PO12∶PAN(2:1); (g, h) SEM image of Na3Zr2Si2PO12∶PAN(3∶1)
Fig. 4
(a) TG curves of 2NZSPO/PAN-[PEO15-NaTFSI] composite solid electrolyte membrane; (b) DSC curves of PEO15-NaTFSI and 2NZSPO/PAN-[PEO15-NaTFSI]; (c) tensile curves of 2NZSPO/PAN-[PEO15-NaTFSI] composite solid electrolyte membrane and pure PEO
Fig. 5
(a) AC impedance spectrum of PEO15-NaTFSI, (b) xNZSPO/PAN-[PEO15-NaTFSI] (x=1,2,3) composite solid electrolyte; (c) Arrhenius plot of composite solid electrolyte with different proportions
Table 1
表1
表1复合固体电解质离子迁移数
Table 1 Ion migration number of composite solid electrolyte
Fig. 6
(a) electrochemical stability window of 2NZSPO/PAN-[PEO15-NaTFSI] composite solid electrolyte was measured by linear scanning voltammetry at a scan rate of 0.1 mV/s at 60 ℃; (b) first charge/discharge curves of NVP/SPE/Na and NVP/CPE/Na batteries at 0.1 C and 80 ℃
Fig. 7
(a) the rate performance of NVP/CPE/Na batteries at 0.1 C; (b) rate performance of NVP/SPE/Na batteries at 0.1 C; (c) cyclic performance of NVP/CPE/Na a batteries at a constant current density of 0.1 C; (d) cyclic performance of NVP/SPE/Na batteries at a constant current density of 0.1 C
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