Chemical compatibility between garnet-like solid state electrolyte Li6.75La3Zr1.75Ta0.25O12 and major commercial lithium battery cathode materials

High-temperature chemical compatibilities between garnet-like solid state electrolyte of Li6.75La3Zr1.75Ta0.25O12 (LLZTO) and the four major commercial lithium battery cathode materials, i. e., LiCoO2 (LCO), LiMn2O4 (LMO), LiNi0.33Co0.33Mn0.33O2 (NCM) and LiFePO4 (LFP) were investigated by X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS), respectively. The same volume fraction of LLZTO and electrode powders were mixed and heated at 400-900 degrees C for 1 h. According to the results by XRD, LMO and LFP react with LLZTO at approximately 500 degrees C. The Raman data reveal that both LCO and NCM can react with LLZTO at approximately 700 degrees C, which lead to generate LaCoO3 and LaCo1-xMnxO3 with a rhombohedral symmetry, respectively. (C) 2016 The Chinese Ceramic Society. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.