Solid Electrolyte Li3xLa2/3-xTiO3 Powder Prepared by Hydrothermal Method
LI Yajie1, LIU Jian1, XU Chen2, XING Bin3
1 School of Mechanical Engineering, Sichuan University, Chengdu 610065, China 2 China Academy of Engineering Physics, Chengdu 610065, China 3 National Engineering Laboratory for Industrial Big-data Application Technology, Chongqing Innovation Center of Industrial Big-Data Co. Ltd., Chongqing 400707, China
Abstract: The solid electrolyte lanthanum titanate lithium (LLTO) with perovskite structure is an important research hotspot in the field of solid electrolyte because of its high conductivity at room temperature. It is necessary to study the conditions for the preparation of LLTO powder with less heterophase, small microstrain, uniform and suitable particle size distribution, uniform size and fine morphology. In this paper, the solid electrolyte LLTO was prepared by hydrothermal method under two different heat preservation temperatures (900 ℃ and 1 050 ℃). The synthesis, morphology, particle size, microstrain and other conditions of LLTO prepared under these two different heat preservation conditions were studied. The results show that the LLTO can be successfully synthesized at 900 ℃ and 1 050 ℃, but the powders synthesized at the two temperatures are both irregular particles and have a certain degree of agglomeration. From the point of view of the phase composition, LLTO synthesized under the thermal insulation condition of 900 ℃ contains less heterophases. Considering particle size from laser granulometer and grain size from X ray diffraction, from macro-perspective of laser granulometer, powder particle size distribution was in 1.7—3 μm and 33—57 μm at 900 ℃ for 2 h and in 2.5—7 μm and 24—48 μm at 1 050 ℃ for 2 h while the average grain size analysis from the microscopic view by XRD were 217.3 nm (900 ℃), 314.3 nm (1 050 ℃). From the perspective of the microstrain of the prepared particles, microstrain has existed to lead to the change of lattice parameters at both temperatures, and the microstrain was larger at the higher heat preservation temperature (1 050 ℃). Based on the experimental results, when the heat preservation temperature is 900 ℃, it is more suitable for the preparation of LLTO powder.
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2021, Vol. 35 
