How stable is LiNi0.8Co0.15Al0.05O2 under high-temperature hydrocarbon ceramic fuel cell conditions?

Document Type

Article

Publication Date

9-22-2022

Department

Department of Materials Science and Engineering

Abstract

LiNi0.8Co0.15Al0.05O2 (LNCA) is an important cathode material optimized for room-temperature operation of lithium-ion batteries (LIBs). As an emerging research area, LNCA was recently applied as electrodes (both cathode and anode) for high-temperature ceramic fuel cells (CFCs) with impressive performances. This raises a critical question: How stable is LNCA as a CFC anode under methane-fueled conditions (i.e., in CH4 and CO2 at high temperatures)? Herein, we investigated the structure stability of LNCA in CH4 and CO2 at a wide temperature range of 100–800 °C. The corresponding gas-solid reaction equations under these conditions were proposed for the first time. It was found that LNCA started to react with CH4 at 500 °C, leading to its decomposition into Li2CO3, NiO/CoO solid solution, Ni/Co alloy, and LiAlO2. The NiO/CoO solid solution was further reduced into Ni/Co by CH4 at 600 °C. Furthermore, CO2 could make LNCA decomposed into Li2CO3, NiO/CoO, and Al2O3 at 600 °C or above. These findings can be used to design Ni/Co-based anodes for CFCs with LNCA.

Publication Title

Ceramics International

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