Issue 7, 2022

Thermally-driven reactivity of Li0.35La0.55TiO3 solid electrolyte with LiCoO2 cathode

Abstract

A critical bottleneck for developing successful solid-state batteries is minimizing the interfacial impedances between the solid electrolyte and the active electrode materials. Advancing our understanding of the chemically and electro-chemically induced reactions of the cathode–electrolyte interface is important to achieve stable interfaces with desired charge transfer properties. The perovskite Li-solid electrolyte with the general formula Li3xLa2/3−x1/3−2xTiO3 (LLTO) is an interesting candidate for solid-state Li-ion cells due to its superionic Li-ion conductivity. However, the chemical compatibility of LLTO with potential cathode materials is not sufficiently understood, and here we examine the LLTO interface with thin-film LiCoO2 (LCO) cathode layers. We show that elemental mixing, in particular Co diffusion into LLTO, and increased structural ordering of the LCO occurs at moderate temperatures, on-setting around 300 °C in air, even in the absence of any secondary phases. This reaction decreases the LCO|LLTO interface charge transfer resistance by almost 50% after annealing to 500 °C relative to the as-deposited state. Reduction of the interface charge transfer resistance can be attributed to the formation of a mixed electronic and ionic conducting zone near the interface upon Co diffusion into LLTO. This finding can guide the engineering of cathode–solid electrolyte interfaces with fast charge transfer kinetics.

Graphical abstract: Thermally-driven reactivity of Li0.35La0.55TiO3 solid electrolyte with LiCoO2 cathode

Supplementary files

Article information

Article type
Paper
Submitted
14 Okt 2021
Accepted
25 Jan 2022
First published
03 Feb 2022
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. A, 2022,10, 3485-3494

Thermally-driven reactivity of Li0.35La0.55TiO3 solid electrolyte with LiCoO2 cathode

S. Chandra, Y. Kim, D. Vivona, I. Waluyo, A. Hunt, C. Schlueter, J. B. Lee, Y. Shao-Horn and B. Yildiz, J. Mater. Chem. A, 2022, 10, 3485 DOI: 10.1039/D1TA08853J

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