Dong Zhencai, Xu Chao, Wu Yongmin, Tang Weiping, Song Shufeng, Yao Jianyao, Huang Zhengyong, Wen Zhaoyin, Lu Li, Hu Ning
College of Aerospace Engineering, Chongqing University, Chongqing 400044, China.
College of Electrical Engineering, Chongqing University, Chongqing 400044, China.
Nanomaterials (Basel). 2019 May 10;9(5):721. doi: 10.3390/nano9050721.
Garnet LiLaZrO is one of the most promising solid electrolytes used for solid-state lithium batteries. However, low ionic conductivity impedes its application. Herein, we report Ta-doping garnets with compositions of LiLaZrTaO (0.1 ≤ x ≤ 0.75) obtained by solid-state reaction and free sintering, which was facilitated by graphene oxide (GO). Furthermore, to optimize LiLaZrTaO, Mg was select as a second dopant. The dual substitution of Ta for Zr and Mg for Li with a composition of LiMgLaZrTaO showed an enhanced total ionic conductivity of 6.1 × 10 S cm at room temperature. Additionally, spark plasma sintering (SPS) was applied to further densify the garnets and enhance their ionic conductivities. Both SPS specimens present higher conductivities than those produced by the conventional free sintering. At room temperature, the highest ionic conductivity of LiMgLaZrTaO sintered at 1000 °C is 8.8 × 10 S cm, and that of LiLaZrTaO sintered at 1050 °C is 1.18 × 10 S cm.
石榴石LiLaZrO是用于固态锂电池的最具前景的固体电解质之一。然而，低离子电导率阻碍了其应用。在此，我们报道了通过固态反应和自由烧结获得的具有LiLaZrTaO（0.1≤x≤0.75）组成的钽掺杂石榴石，氧化石墨烯（GO）促进了该过程。此外，为了优化LiLaZrTaO，选择镁作为第二掺杂剂。Ta取代Zr以及Mg取代Li的双重取代，组成LiMgLaZrTaO，在室温下显示出增强的总离子电导率，为6.1×10 S/cm。此外，应用火花等离子烧结（SPS）进一步致密化石榴石并提高其离子电导率。两种SPS样品的电导率均高于传统自由烧结制备的样品。在室温下，1000°C烧结的LiMgLaZrTaO的最高离子电导率为8.8×10 S/cm，1050°C烧结的LiLaZrTaO的最高离子电导率为1.18×10 S/cm。
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