Low-temperature synthesis of dense garnet-type Li6.5La3Zr1.5Ta0.5O12 layered structures using fluorite-type precursor oxide

We have fabricated a dense garnet-type Li-ion conductor at low temperature (700 degrees C) by allowing the dense precursor oxide La0.6Zr0.3Ta0.1O1.75 to react with the lithium vapor generated from the thermal decomposition of lithium nitrate. The obtained garnet-type Li6.5La3Zr1.5Ta0.O-5(12) electrolyte layer had a columnar structure and its thickness was controlled within the range of 14 similar to 500 mu m by adjusting the reaction temperature and time. The fabricated sample (500 mu m) exhibited a total Li-ion conductivity of 5.1 x 10(-1) S.cm(-1) at 25 degrees C and the temperature dependence of the Li-ion conductivity of the garnet-type Li-ion conductor was also investigated. Moreover, we were able to fabricate 30 mu m thick dense free-standing Li6.5La3Zr1.5Ta0.5O12 sheets using this precursor method. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

A dense garnet-type Li-ion conductor was successfully fabricated at low temperature, showing controlled thickness and high Li-ion conductivity. Additionally, a thin free-standing Li6.5La3Zr1.5Ta0.5O12 sheet was also produced using this method.