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采用溶胶-凝胶法,添加不同比例的Li3PO4助熔剂,合成Li1.3Al0.3Ti1.7(PO4)3锂离子固体电解质烧结片,采用X射线衍射、扫描电子显微镜研究合成产物的结构与形貌,采用循环伏安及交流阻抗技术研究添加不同摩尔分数的Li1.3Al0.3Ti1.7(PO4)3固体电解质烧结片的结构、氧化-还原电位、离子电导率和活化能。结果表明:添加与未添加Li3PO4助熔剂的Li1.3Al0.3Ti1.7(PO4)3烧结片具有相似的X射线衍射结果。添加Li3PO4的Li1.3Al0.3Ti1.7(PO4)3烧结片的空隙率较小,更为致密。添加Li3PO4对Li1.3Al0.3Ti1.7(PO4)3的氧化-还原电位影响不大。在所有添加Li3PO4助熔剂的Li1.3Al0.3Ti1.7(PO4)3烧结片中,添加1%(摩尔分数)Li3PO4的烧结片具有最高的离子电导率6.15×10-4S/cm和最低的活化能0.3142eV。
The Li1.3Al0.3Ti1.7 (PO4) 3 lithium ion solid electrolyte sintered sheet was prepared by sol-gel method with different proportions of Li3PO4 flux. The structure and morphology of the synthesized product were characterized by X-ray diffraction and scanning electron microscopy The structure, oxidation-reduction potential, ionic conductivity and activation energy of Li1.3Al0.3Ti1.7 (PO4) 3 solid electrolyte sintered sheets with different molar fractions were studied by cyclic voltammetry and AC impedance techniques. The results show that the XRD results of Li1.3Al0.3Ti1.7 (PO4) 3 sintered samples with or without Li3PO4 flux are similar. The porosity of Li1.3Al0.3Ti1.7 (PO4) 3 sintered with Li3PO4 is smaller and more compact. Addition of Li3PO4 has little effect on the oxidation-reduction potential of Li1.3Al0.3Ti1.7 (PO4) 3. In all Li1.3Al0.3Ti1.7 (PO4) 3 sintered sheets with addition of Li3PO4 flux, the sintered sheet with 1% (mole fraction) Li3PO4 had the highest ionic conductivity of 6.15 × 10-4 S / cm and the lowest activation Can be 0.3142eV.