Application of Silicon Nitride Bonded Silicon Carbide Saggar in the Synthesis of Lithium Ion Ternary Cathode Materials
This paper introduces the performance of silicon nitride bonded silicon carbide saggar in the synthesis of high nickel ternary cathode material NCM811 over 78 cycles,detailing the reasons for decommissioning,changes in physicochemical indices,and resistance to erosion. The results show that:(1) after 78 cycles of service in the NCM811 roller kiln,the crucible comes down due to the formation and extension of sidewall cracks;(2) the crucible demonstrated good corrosion resistance during the long service. with a continuous and stable reaction layer forming on the surface,preventing spalling and flaking;(3) the main reaction product was Li4SiO4,with a reaction layer thickness of 500～700 μm. TOF-SIMS detection results indicated that the Li element is mainly enriched in the area within 200μm of the surface.
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