Li_1.3Al_0.3Ti_1.7(PO₄)₃ (LATP) is a promising candidate as solid electrolyte and Li⁺ conductive component in the composite electrodes of all-solid-state Li-ion batteries. For both applications, reducing the sintering temperature of LATP while preserving its electrochemical properties is highly desired. This work is dedicated to reducing the sintering temperature of LATP from conventionally around 1000 °C to a low temperature of 775 °C with adding an extra 10 wt % of Li₂CO₃ to the precursors by a reactive sintering process. Comparative investigations with the stoichiometric LATP prepared by the same sintering method indicate that the combination effect of reactive sintering and Li₂CO₃-excess promotes the liquid phase sintering within LATP yielding a high relative density of 95.3%, whereas the stoichiometric LATP can only achieve a comparable relative density at 875 °C. Furthermore, the reactive sintering assisted Li₂CO₃-excess LATP exhibits a significantly higher ionic conductivity of 0.65 mS cm⁻¹ at 25 °C and lower total activation energy of 0.334 eV compared with that of the stoichiometric LATP. Correlative studies on the microstructure and the separated specific grain/grain boundary conductivities for the two samples reveal that the improvement of Li⁺ conductivity for Li-excess LATP is attributed to its smaller total grain boundary thickness.

Li _1.3 Al _0.3 Ti _1.7（PO ₄）₃（LATP）作为全固态锂离子电池复合电极中的固体电解质和Li ⁺导电成分很有希望。对于这两种应用，在保持LATP的电化学性能的同时降低LATP的烧结温度是非常需要的。这项工作致力于通过添加额外10 wt％的Li ₂ CO ₃将LATP的烧结温度从通常的1000°C降低到775°C的低温。通过反应性烧结工艺将其制成前体。用相同的烧结方法制备的化学计量的LATP的对比研究表明，反应烧结和Li ₂ CO _3-过量的组合作用促进了LATP内的液相烧结，产生了95.3％的高相对密度，而化学计量的LATP只能达到在875°C下具有可比的相对密度。此外，反应烧结辅助的Li ₂ CO _3-过量的LATP表现出明显更高的0.65 mS cm ^-1的离子电导率与化学计量的LATP相比，在25°C的温度下具有更低的总活化能0.334 eV。对两个样品的微观结构和分离的特定晶界/晶界电导率的相关研究表明，过量Li的LATP的Li ⁺电导率的提高归因于其较小的总晶界厚度。