Abstract:The waste saggar used to roast ternary cathode material LiNixCoyMn1-x-yO2 in industry was used as the sample. The corrosion mechanism of the saggar in the high temperature synthesis process of ternary cathode material LiNixCoyMn1—x—yO2 was studied by fluorescence and chemical analysis, X-ray diffraction analysis, microstructure and energy spectrum analysis. The results show that the erosion of saggar is mainly caused by lithium ions during the synthesis of LiNixCoyMn1-x-yO2, whose erosion product is LiAlO2. At the same time, the original sagger matrix is destroyed to form a new phase of Mg6Al2(OH)18?4.5H2O. The three metal ions of nickel, cobalt and manganese do not form new phase during the high temperature synthesis process. The eroded saggar is obviously divided into two layers, and there is a transition band between the two layers, which may be a dense transition layer formed in the middle to protect the saggar from further damage.