Vinnichenko Mykola, Waetzig Katja, Aurich Alf, Baumgaertner Christoph, Herrmann Mathias, Ho Chang Won, Kusnezoff Mihails, Lee Chang Woo
Fraunhofer IKTS, Winterbergstr. 28, 01227 Dresden, Germany.
Department of Chemical Engineering (Integrated Engineering), College of Engineering, Kyung Hee University, 1732, Deogyeong-daero, Giheung, Yongin 17104, Gyeonggi, Korea.
Nanomaterials (Basel). 2022 Sep 13;12(18):3178. doi: 10.3390/nano12183178.
The density, microstructure, and ionic conductivity of solid electrolyte LiAlTi(PO) (LATP) ceramics prepared by cold sintering using liquid and solid sintering additives are studied. The effects of both liquid (water and water solutions of acetic acid and lithium hydroxide) and solid (lithium acetate) additives on densification are investigated. The properties of cold-sintered LATP are compared to those of conventionally sintered LATP. The materials cold-sintered at temperatures 140-280 °C and pressures 510-600 MPa show relative density in the range of 90-98% of LATP's theoretical value, comparable or higher than the density of conventionally sintered ceramics. With the relative density of 94%, a total ionic conductivity of 1.26 × 10 S/cm (room temperature) is achieved by cold sintering at the temperature of 200 °C and uniaxial pressure of 510 MPa using water as additive. The lower ionic conductivities of the cold-sintered ceramics compared to those prepared by conventional sintering are attributed to the formation of amorphous secondary phases in the intergranular regions depending on the type of additives used and on the processing conditions selected.
研究了使用液体和固体烧结添加剂通过冷烧结制备的固体电解质LiAlTi(PO)（LATP）陶瓷的密度、微观结构和离子电导率。研究了液体（水、乙酸和氢氧化锂水溶液）和固体（乙酸锂）添加剂对致密化的影响。将冷烧结LATP的性能与传统烧结LATP的性能进行了比较。在140-280°C温度和510-600 MPa压力下冷烧结的材料显示出相对密度在LATP理论值的90-98%范围内，与传统烧结陶瓷的密度相当或更高。在相对密度为94%时，通过使用水作为添加剂在200°C温度和510 MPa单轴压力下进行冷烧结，实现了1.26×10 S/cm（室温）的总离子电导率。与传统烧结制备的陶瓷相比，冷烧结陶瓷的离子电导率较低归因于根据所用添加剂的类型和所选加工条件，在晶界区域形成了非晶态第二相。
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