Superior corrosion resistance spinel-containing sagger material for calcining Li-ion battery cathode material

This work addresses the evaluation of different spinel-containing composition sagger material in thermo-mechanical properties and corrosion resistance contacting with cathode material. In order to improve the corrosion resistance, the efficient way is to prevent the Li+ diffusion into the sagger material, LiAlO2 generated by the reaction between spinel and Li-ion battery cathode material wrapped on the surface as corrosion protective layer during the calcination, which prevent the physically contact and react with cathode materials, due to the LiAlO2 obtained the low-activity to react with cathode material. Meanwhile, the thermo-mechanical properties of sagger material with different addition of spinel were characterized. The results indicated that the using of spinel lead to the better mechanical strength and thermal shock resistance of the sagger material due to introducing the second phase and mismatch of thermal expansion, respectively. Considering all the aspects, the optimal addition of spinel was 14 wt %.