Preparation of high-density garnet thin sheet electrolytes for all-solid-state Li-Metal batteries by tape-casting technique
Preparation of high-density garnet thin sheet electrolytes for all-solid-state Li-Metal batteries by tape-casting technique
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流延法制备全固态锂金属电池用高密度石榴石薄片电解质
DOI：
10.1016/j.jallcom.2019.03.409
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发表时间：
2019-06-30
影响因子：
6.2
通讯作者：
Zhang, Tao
中科院分区：
文献类型：
--
作者：
Gao, Kangning;He, Minghui;Zhang, Tao
石榴石电解质由于其对锂离子的安全性和稳定性，成为全固态锂离子电池发展的一个很有前途的候选材料。然而，其高密度薄片的生产困难限制了其实际应用。本文采用流延成型技术制备了石榴石电解质（Li6.4La3Zr1.4Ta0.6O12，LLZTO）。通过使用Li 2 O作为液相烧结添加剂，实现了高达99%的高相对密度。电化学结果表明，LLZTO片在30 ℃下具有5.2 × 10（-4）S cm（-1）的离子电导率和对Li金属的良好循环稳定性。基于该薄片，全固态Li/LLZTO/LiFePO 4电池在60 ℃和0.1C下表现出优异的可逆循环，初始放电比容量为125.8 mA h g（-1），50次循环后保持率为92.3%。这些结果表明，这里展示的流延工艺提供了一种生产高性能全固态锂金属电池用高密度石榴石薄片电解质的有效方法。(C)2019爱思唯尔B. V.保留所有权利。
Garnet electrolyte is a promising candidate for the development of all-solid-state Li-metal batteries, because of its safety and stability against Li metal. However, its practical application is limited by the difficulty in production of its high-density thin sheet. In this work, we have fabricated garnet thin sheet electrolytes (Li6.4La3Zr1.4Ta0.6O12, LLZTO) by tape-casting technique. By using Li2O as a liquid-phase sintering additive, a high relative density up to 99% was achieved. Electrochemical results show the LLZTO sheets have an ionic conductivity of 5.2 x 10(-4) S cm(-1 )at 30 degrees C and good cycling stability against Li metal. Based on the sheets, all-solid-state Li/LLZTO/LiFePO4 batteries exhibit excellent reversible cycles at 60 degrees C and 0.1C with an initial discharge specific capacity of 125.8 mA h g(-1) and a retention of 92.3% after 50 cycles. These results indicate that the tape-casting process demonstrated here provides an effective method of producing high-density garnet thin sheet electrolytes for high-performance all-solid-state Li-metal batteries. (C) 2019 Elsevier B.V. All rights reserved.