【摘要】 NASICON型正磷酸盐LiM2(PO4)3(M=Ti,Ge,Zr,Hf)是近来研究得比较深入的锂快离子导体。LiTi2(PO4)3难于烧结得到致密的LiTi2(PO4)3陶瓷,且离子电导率很低,在298K时为8.260×10-8S/cm,613K时为8.241×10-5S/cm,而当以三价的Al3+离子经传统的固相烧结反应部分取代LiTi2(PO4)3中四价的Ti4+离子后,通过DSC、DTG、电化学阻抗与SEM测试表明,不仅能获得致密度高稳定的产物,而且烧结后得到的锂快离子导体Li3-x(Al1-xTix)2(PO4)3(X=1.0~0.55)体系在室温下的电导率有了巨大的提高。当X=0.85时,组分Li1.3Al0.3Ti1.7(PO4)3离子电导率最大,298K时为1.792×10-6S/cm和613K时为9.210×10-4S/cm。更多还原

【Abstract】 Lithium orthophosphate LiM₂（PO₄）₃ （M=Ti, Ge, Zr, Hf）, with the NASICON structure has been studied as a lithium fast ionic conductor for a long time. It is difficult to obtain dense ceramic of the compound LiTi₂（PO₄）₃ powder. The ionic conductivity measurements on some dense LiTi₂（PO₄）₃ ceramics showed that the ionic conductivity was 8.260×10^-8S/cm at 298K and 8.241×10^-5S/cm at 613K. However, as the part substitution of Al³⁺ for Ti⁴⁺ in LiTi₂（PO₄）₃ happened by the conventional solid-state reaction, the measurement of DSC, DTG, EI （Electrical impedance） and SEM showed that the sintering of the reactant powders was largely promoted and the ionic conductivity of Li_3-x(Al_1-xTi_x)₂（PO₄）₃ （X=1.0～0.55） ceramics was obviously enhanced. The ionic conductivities at X=0.85 in Li_3-x(Al_1-xTi_x)₂（PO₄）₃ reached their maximums, which were 1.792×10^-6S/cm at 298K and 9.210×10^-4S/cm at 613K, respectively.更多还原