Ali Md Yusuf, Orthner Hans, Wiggers Hartmut
Institute for Energy and Materials Processes-Reactive Fluids, University of Duisburg-Essen, 47057 Duisburg, Germany.
Center for Nanointegration Duisburg-Essen (CENIDE), 47057 Duisburg, Germany.
Nanomaterials (Basel). 2024 Dec 29;15(1):42. doi: 10.3390/nano15010042.
Solid-state electrolytes for lithium-ion batteries, which enable a significant increase in storage capacity, are at the forefront of alternative energy storage systems due to their attractive properties such as wide electrochemical stability window, relatively superior contact stability against Li metal, inherently dendrite inhibition, and a wide range of temperature functionality. NASICON-type solid electrolytes are an exciting candidate within ceramic electrolytes due to their high ionic conductivity and low moisture sensitivity, making them a prime candidate for pure oxidic and hybrid ceramic-in-polymer composite electrolytes. Here, we report on producing pure and Y-doped Lithium Aluminum Titanium Phosphate (LATP) nanoparticles by spray-flame synthesis. The as-synthesized samples consist of an amorphous component and anatase-TiO crystalline particles. Brief annealing at 750-1000 °C for one hour was sufficient to achieve the desired phase while maintaining the material's sub-micrometer scale. Rietveld analysis of X-Ray diffraction data demonstrated that the crystal volume increases with Y doping. At the same time, with high Y incorporation, a segregation of the YPO phase was observed in addition to the desired LATP phase. Another impurity phase, LiTiOPO, was observed besides YPO and, with higher calcination temperature (1000 °C), the phase fraction for both impurities also increased. The ionic conductivity increased with Y incorporation from 0.1 mS/cm at room temperature in the undoped sample to 0.84 mS/cm in the case of LAY0.1TP, which makes these materials-especially considering the comparatively low sintering temperature-highly interesting for applications in the field of solid-state batteries.
用于锂离子电池的固态电解质能够显著提高存储容量，因其具有诸如宽电化学稳定性窗口、对锂金属相对优异的接触稳定性、固有的枝晶抑制特性以及宽温度功能范围等吸引人的特性，故而处于替代储能系统的前沿。NASICON型固态电解质因其高离子电导率和低湿度敏感性，在陶瓷电解质中是令人兴奋的候选材料，使其成为纯氧化物和陶瓷 - 聚合物复合电解质的主要候选材料。在此，我们报告通过喷雾火焰合成法制备纯的和钇掺杂的磷酸锂铝钛（LATP）纳米颗粒。合成后的样品由非晶成分和锐钛矿 - TiO晶体颗粒组成。在750 - 1000°C下短暂退火1小时足以实现所需相，同时保持材料的亚微米尺度。对X射线衍射数据的Rietveld分析表明，晶体体积随钇掺杂而增加。同时，随着高钇掺入，除了所需的LATP相外，还观察到YPO相的偏析。除了YPO之外，还观察到另一种杂质相LiTiOPO，并且随着煅烧温度升高（1000°C），两种杂质的相分数也增加。离子电导率随着钇掺入从未掺杂样品在室温下的0.1 mS/cm增加到LAY0.1TP情况下的0.84 mS/cm，这使得这些材料——特别是考虑到相对较低的烧结温度——在固态电池领域的应用中极具吸引力。
