Li-Ion Conduction and Stability of Perovskite Li3/8Sr7/16Hf1/4Ta3/4O3

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• 作者：Bing Huang ; Biyi Xu ; Yutao Li ; Weidong Zhou ; Ya You ; Shengwen Zhong ; Chang-An Wang ; John B. Goodenough
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：June 15, 2016
• 年：2016
• 卷：8
• 期：23
• 页码：14552-14557
• 全文大小：394K
• 年卷期：0
• ISSN：1944-8252

文摘

A solid Li-ion conductor with a high room temperature Li-ion conductivity and small interfacial resistance is required for its application in next-generation Li-ion batteries. Here, we prepared a cubic perovskite-related oxide with the general formula Li<sub>3/8sub>Sr<sub>7/16sub>Hf<sub>1/4sub>Ta<sub>3/4sub>O<sub>3sub> (LSHT) by a conventional solid-state reaction method, which was studied by X-ray diffraction, electrochemical impedance spectroscopy, and <sup>7sup>Li MAS NMR. Li<sub>3/8sub>Sr<sub>7/16sub>Hf<sub>1/4sub>Ta<sub>3/4sub>O<sub>3sub> has a high Li-ion conductivity of 3.8 × 10<sup>–4sup> S cm<sup>–1sup> at 25 °C and a low activation energy of 0.36 eV in the temperature range 298–430 K. It exhibits both high stability and small interfacial resistance with commercial organic liquid electrolytes, which makes it promising as a separator in Li-ion batteries.