A Super High Lithium Ion Conducting Solid Electrolyte of Grain Boundary Modified Li1.4Ti1.6 Al0.4(PO4)3
A Super High Lithium Ion Conducting Solid Electrolyte of Grain Boundary Modified Li1.4Ti1.6 Al0.4(PO4)3
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DOI：
10.1149/2.018204jes
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发表时间：
2012
影响因子：
3.9
通讯作者：
K. Takahashi;J. Ohmura;D. Im;D. Lee;Tao Zhang;N. Imanishi;A. Hirano;M. B. Phillipps;Y. Takeda;O. Yamamoto
中科院分区：
文献类型：
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作者：
K. Takahashi;J. Ohmura;D. Im;D. Lee;Tao Zhang;N. Imanishi;A. Hirano;M. B. Phillipps;Y. Takeda;O. Yamamoto
以柠檬酸为前驱体，采用溶胶-凝胶法合成了单相NASICON型锂离子导体固体电解质Li1.4Ti1.6Al0.4(PO4)3(LTAP)。阻抗曲线分析表明，950C烧结的LTAP的体相电导率和晶界电导率分别为1.80×10−3 S cm−1和1.3×10−3 S cm−1。在50℃饱和LiCl水溶液中浸泡一周后，晶界电阻几乎消失，25℃时的总电导率从7.50×10−4 S cm−1增加到9.2×10−3 S cm−1。在露天环境中，高电导率在很长一段时间内没有变化。浸泡的LTAP的总电导率取决于大气中的湿度，在低湿度的情况下与原始LTAP的电导率相当(露点约为−80℃)。通过在LTAP纳米颗粒的晶界形成低阻LiCl-XH2O相解释了电导率的提高。
A single phase NASICON-type lithium conducting solid electrolyte, Li 1.4 Ti 1.6 Al 0.4 (PO 4) 3 (LTAP), was synthesized from the precursor prepared by a sol-gel method with citric acid. The bulk and grain boundary conductivity in open air (relative humidity; ca. 60%) of the LTAP sintered at 950 C was estimated to be 1.8× 10− 3 S cm− 1 and 1.3× 10− 3 S cm− 1 at 25 C, respectively, from the impedance profile analysis. The grain boundary resistance almost vanished following immersion in a saturated LiCl aqueous solution at 50 C for one week, and the total conductivity at 25 C increased from 7.5× 10− 4 S cm− 1 to 9.2× 10− 3 S cm− 1 in open air. The high conductivity has not changed for a long period in open air. The total conductivity of the immersed LTAP was dependent on the humidity in the atmosphere and was comparable to that of the pristine LTAP at as low humidity as in a glove box (dew point of ca.− 80 C). The conductivity enhancement was explained by the formation of a low resistance LiCl-xH 2 O phase trapped in the grain boundaries of LTAP nanoparticles.