PEO Infiltration of Porous Garnet-Type Lithium-Conducting Solid Electrolyte Thin Films
PEO Infiltration of Porous Garnet-Type Lithium-Conducting Solid Electrolyte Thin Films
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DOI：
10.3390/ceramics4030031
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发表时间：
2021-07
期刊：
影响因子：
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通讯作者：
A. I. Waidha;V. Vanita;O. Clemens
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作者：
A. I. Waidha;V. Vanita;O. Clemens
含有锂离子导电聚合物基体和陶瓷填料的复合电解质由于其宽电化学稳定性窗口、高锂离子电导率和低电极/电解质界面电阻而成为全固态锂离子电池有前途的固态电解质。在这项研究中，我们报告了通过雾化喷雾热解和旋涂相结合并随后在 1173 K 进行后退火制备的铝掺杂立方石榴石多孔薄膜的聚合物渗透。该方法为制造厚度在 50 至 100 µm 范围内的三维多孔石榴石网络提供了一种简单易行的途径，该网络可用作陶瓷骨架，为复合电解质中的锂离子传输提供连续的途径。通过扫描电子显微镜证实了所制造薄膜的多孔微观结构。原始薄膜的离子电导率通过电化学阻抗谱测定。我们表明退火时间对薄膜的离子电导率有显着影响。随后的聚合物渗透多孔石榴石膜在 298 K 时显示出最大离子电导率为 5.3 × 10−7 S cm−1，这比原始多孔石榴石膜高出六个数量级。
Composite electrolytes containing lithium ion conducting polymer matrix and ceramic filler are promising solid-state electrolytes for all solid-state lithium ion batteries due to their wide electrochemical stability window, high lithium ion conductivity and low electrode/electrolyte interfacial resistance. In this study, we report on the polymer infiltration of porous thin films of aluminum-doped cubic garnet fabricated via a combination of nebulized spray pyrolysis and spin coating with subsequent post annealing at 1173 K. This method offers a simple and easy route for the fabrication of a three-dimensional porous garnet network with a thickness in the range of 50 to 100 µm, which could be used as the ceramic backbone providing a continuous pathway for lithium ion transport in composite electrolytes. The porous microstructure of the fabricated thin films is confirmed via scanning electron microscopy. Ionic conductivity of the pristine films is determined via electrochemical impedance spectroscopy. We show that annealing times have a significant impact on the ionic conductivity of the films. The subsequent polymer infiltration of the porous garnet films shows a maximum ionic conductivity of 5.3 × 10−7 S cm−1 at 298 K, which is six orders of magnitude higher than the pristine porous garnet film.