A Novel Sol-Gel Method for Large-Scale Production of Nanopowders: Preparation of Li1.5Al0.5Ti1.5(PO4)3 as an Example
A Novel Sol-Gel Method for Large-Scale Production of Nanopowders: Preparation of Li1.5Al0.5Ti1.5(PO4)3 as an Example
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DOI：
10.1111/jace.13997
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发表时间：
2016-02-01
影响因子：
3.9
通讯作者：
Guillon, Olivier
中科院分区：
文献类型：
--
作者：
Ma, Qianli;Xu, Qi;Guillon, Olivier
溶胶-凝胶法是一种广泛应用的纳米粉体制备方法。然而，复杂或昂贵的前体，以及使用有机溶剂和/或热辅助的必要性将该方法限制到实验室规模的水平。本研究发展了一种自发形成溶胶和凝胶的水基溶胶-凝胶法。该方法可大规模合成以Ti ~（4+）和PO ~（43-）为主要成分的化合物，且成本低。Al取代的LiTi 2（PO 4）（3）（LATP）作为锂离子电池或锂空气电池中的固体电解质被广泛研究。在LATP的制造过程中面临的主要挑战，如不令人满意的相纯度，低烧结活性和高生产成本。本研究以Li1.5Al0.5Ti1.5（PO 4）（3）（LATP 05）为研究对象，采用溶胶-凝胶法制备了具有高相纯度、致密化活性和高电导率的Li1.5Al0.5Ti1.5（PO 4）（3）材料。
Sol-gel synthesis is an extensively used method for the preparation of nanopowders. However, complicated or expensive precursors, and the necessity of using organic solvent and/or heat assistance limit the method to laboratory-scaled level. An aqueous-based sol-gel method with spontaneous sol and gel formation is developed in this study. It can be applied on a large scale to synthesize compounds with Ti4+ and PO43- as major components with low cost. Al-substituted LiTi2(PO4)(3) (LATP) has been widely investigated as a promising candidate for solid electrolyte in Li-ion or Li-air batteries. Major challenges such as unsatisfactory phase purity, low sintering activity, and high production costs are faced during the fabrication of LATP. In this study, as a sample application, Li1.5Al0.5Ti1.5(PO4)(3) (LATP05) is conveniently prepared on a large scale by the novel sol-gel method with high phase purity, active densification behavior and high conductivity.