Mullite–cordierite saggars for sintering lithium‐ion battery cathode materials: A review

Abstract During the high‐temperature calcination process of lithium‐ion battery cathode materials, saggars are highly susceptible to corrosion by the cathode material. This leads to the formation of lithium‐containing expansive products, subsequently causing structural damage and performance degradation. To extend their service life, various strategies have been developed, including the introduction of advanced corrosion‐resistant phases, optimization of manufacturing processes to enhance densification, and the design of novel structures to mitigate thermal stresses. Building upon this foundation, this paper systematically analyzes the failure mechanisms of saggars, particularly the synergistic effects of alkali corrosion and thermal cycling fatigue, while summarizing advances in methods for improving saggar performance. Finally, future development trends are projected to provide guidance for the design, preparation, and application of saggars for lithium battery cathode materials.