High lithium ion conductive Li7La3Zr2O12 by inclusion of both Al and Si
High lithium ion conductive Li7La3Zr2O12 by inclusion of both Al and Si
复制标题
DOI：
10.1016/j.elecom.2011.02.035
复制
发表时间：
2011-05-01
影响因子：
5.4
通讯作者：
Ogumi, Zempachi
中科院分区：
文献类型：
--
作者：
Kumazaki, Shota;Iriyama, Yasutoshi;Ogumi, Zempachi
高锂离子（Li+）导电石榴石结构锆酸镧锂（LLZ）固体电解质是通过掺入适量的硅（Si）和铝（Al）制备而成。所得粒状LLZ在298 K时获得了6.8 x 10(-4) S cm(-1)的总Li+电导率。这种改进的电导率与之前报道的LLZ的本体Li+电导率几乎相同，表明Si和Al的掺入有效降低了晶界电阻。透射电子显微镜结合能量色散 X 射线微量分析和电子能量损失光谱进行的微量分析表明，晶界处存在非晶态 Li-Al-Si-O 和纳米晶态 LiAlSiO4。非晶Li-Al-Si-O/LiAlSiO4界面周围的快速锂离子传输将促进LLZ颗粒之间的Li+传输，从而提高LLZ的总Li+电导率。 (C) 2011 Elsevier B.V. 保留所有权利。
High lithium-ion (Li+) conductive garnet-structured lanthanum lithium zirconate (LLZ) solid electrolyte is prepared by incorporation of appropriate amounts of silicon (Si) and aluminum (Al). The resultant pelletized LLZ obtains total Li+ conductivity of 6.8 x 10(-4) S cm(-1) at 298 K. This improved conductivity is nearly identical with the bulk Li+ conductivity of the LLZ reported earlier, suggesting that the grain boundary resistance is effectively reduced by the incorporation of Si and Al. Microanalyses by transmission electron microscopy coupled with energy-dispersive X-ray microanalysis and electron energy-loss spectroscopy revealed the presence of amorphous Li-Al-Si-O with nano crystalline LiAlSiO4 at grain boundaries. Fast lithium-ion transport around the amorphous Li-Al-Si-O/LiAlSiO4 interface will facilitate Li+ transport between the LLZ particles, resulting in the improvement of the total Li+ conductivity of LLZ. (C) 2011 Elsevier B.V. All rights reserved.