Hybrid Polymer/Garnet Electrolyte with a Small Interfacial Resistance for Lithium-Ion Batteries

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• 作者：Dr. Yutao Li ; Dr. Biyi Xu ; Dr. Henghui Xu ; Dr. Huanan Duan ; Dr. Xujie Lü ; Dr. Sen Xin ; Dr. Weidong Zhou ; Dr. Leigang Xue ; Dr. Gengtao Fu ; Prof. Arumugam Manthiram and Prof. John B. Goodenough
• 刊名：Angewandte Chemie
• 出版年：2017
• 出版时间：January 16, 2017
• 年：2017
• 卷：129
• 期：3
• 页码：771-774
• 全文大小：1707K
• ISSN：1521-3757

文摘

Li₇La₃Zr₂O₁₂-based Li-rich garnets react with water and carbon dioxide in air to form a Li-ion insulating Li₂CO₃ layer on the surface of the garnet particles, which results in a large interfacial resistance for Li-ion transfer. Here, we introduce LiF to garnet Li_6.5La₃Zr_1.5Ta_0.5O₁₂ (LLZT) to increase the stability of the garnet electrolyte against moist air; the garnet LLZT-2 wt % LiF (LLZT-2LiF) has less Li₂CO₃ on the surface and shows a small interfacial resistance with Li metal, a solid polymer electrolyte, and organic-liquid electrolytes. An all-solid-state Li/polymer/LLZT-2LiF/LiFePO₄ battery has a high Coulombic efficiency and long cycle life; a Li-S cell with the LLZT-2LiF electrolyte as a separator, which blocks the polysulfide transport towards the Li-metal, also has high Coulombic efficiency and kept 93 % of its capacity after 100 cycles.