Camara Osmane, Xu Qi, Park Junbeom, Yu Shicheng, Lu Xin, Dzieciol Krzysztof, Schierholz Roland, Tempel Hermann, Kungl Hans, George Chandramohan, Mayer Joachim, Basak Shibabrata, Eichel Rüdiger-A
Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research-Fundamental Electrochemistry (IEK-9), 52428 Jülich, Germany.
Dyson School of Design Engineering, Imperial College London, SW7 2AZ London, United Kingdom.
Cryst Growth Des. 2023 Feb 17;23(3):1522-1529. doi: 10.1021/acs.cgd.2c01098. eCollection 2023 Mar 1.
Solid-state sintering at high temperatures is commonly used to densify solid electrolytes. Yet, optimizing phase purity, structure, and grain sizes of solid electrolytes is challenging due to the lack of understanding of relevant processes during sintering. Here, we use an environmental scanning electron microscopy (ESEM) to monitor the sintering behavior of NASICON-type LiAlTi(PO) (LATP) at low environmental pressures. Our results show that while no major morphological changes are observed at 10 Pa and only coarsening is induced at 10 Pa, environmental pressures of 300 and 750 Pa lead to the formation of typically sintered LATP electrolytes. Furthermore, the use of pressure as an additional parameter in sintering allows the grain size and shape of electrolyte particles to be controlled.
高温固态烧结通常用于使固体电解质致密化。然而，由于对烧结过程中相关工艺缺乏了解，优化固体电解质的相纯度、结构和晶粒尺寸具有挑战性。在此，我们使用环境扫描电子显微镜（ESEM）在低环境压力下监测NASICON型LiAlTi(PO)（LATP）的烧结行为。我们的结果表明，虽然在10 Pa时未观察到主要的形态变化，在10 Pa时仅诱导粗化，但300和750 Pa的环境压力会导致典型烧结的LATP电解质形成。此外，在烧结中使用压力作为附加参数可以控制电解质颗粒的晶粒尺寸和形状。
