Enhanced densification and ionic conductivity of LLZO by flash sintering

IF 1.3 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS Advances in Applied Ceramics Pub Date : 2023-10-05 DOI:10.1080/17436753.2023.2265193

Amirreza Sazvar, Hossein Sarpoolaky, Mohammad Golmohammad

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Abstract

ABSTRACTFlash sintering arouses the interest since high-density ceramics can be obtained at shorter dwell times and lower temperatures than conventional sintering. In this study, the cubic garnet Li6.25Al0.25La3Zr2O12 (Al-LLZO) was successfully synthesised by the solid-state method. The powders were uniaxially pressed and were subjected to flash sintering at 850°C in a tube furnace under a DC bias using various current densities. It is evidenced that control of the flash electric current is a crucial factor for densification of Al-LLZO. The sample sintered in 50 V cm−1 and 200 mA mm−2 showed a cubic LLZO, 94 ± 0.4% relative density, 0.37 mS cm−1 total ionic conductivity and 0.32 eV activation energy. In addition, it was demonstrated that increasing the current density had a considerable impact on the relative density. This outstanding ionic conductivity might be due to the lower lithium loss and higher density as a result of flash sintering method applied.KEYWORDS: GarnetLLZOlithium lossflash sinteringsolid-state batteries Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work is based upon research funded by Iran National Science Foundation (INSF) under project No. 4000823.

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闪蒸烧结增强LLZO的致密化和离子电导率

与传统烧结相比，闪速烧结可以在更短的停留时间和更低的温度下获得高密度陶瓷，因此引起了人们的关注。本研究采用固相法成功合成了立方石榴石Li6.25Al0.25La3Zr2O12 (Al-LLZO)。粉末被单轴压制，并在850°C的管状炉中在直流偏置下使用不同的电流密度进行闪烧。结果表明，对闪蒸电流的控制是Al-LLZO致密化的关键因素。在50 V cm−1和200 mA mm−2条件下烧结的样品具有立方LLZO，相对密度为94±0.4%，总离子电导率为0.37 mS cm−1，活化能为0.32 eV。此外，研究还表明，增加电流密度对相对密度有相当大的影响。这种优异的离子导电性可能是由于采用了闪速烧结方法，锂损失更低，密度更高。关键词:garnetllzlithium lossflash sintering固态电池披露声明作者未报告潜在的利益冲突。本工作基于伊朗国家科学基金会(INSF)项目资助的研究，项目编号4000823。

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来源期刊

Advances in Applied Ceramics 工程技术-材料科学：硅酸盐

CiteScore

4.40

自引率

4.50%

发文量

审稿时长

5.2 months

期刊介绍： Advances in Applied Ceramics: Structural, Functional and Bioceramics provides international coverage of high-quality research on functional ceramics, engineering ceramics and bioceramics.