The Development Of Alumina Crucibles Sintering Li-Ion Battery Cathode Materials

Alumina ceramic is widely used in machinery, power electronics, chemicals, construction and other fields due to high mechanical strength, high resistance, hardness, high melting point, excellent chemical stability and other properties, and is currently used as alumina crucible materials preparation for lithium battery anode materials. However, alumina ceramic crucible firing anode materials of lithium batteries must have good air tightness, so it must be fired in the ultra-high temperature (typically greater than 1650℃), resulting in high production costs.In this paper, alumina ceramic crucible firing lithium anode materials were successfully fabricated at a low sintering temperature assisted by SiO2-Si-CaF2-V2O5 multiphase sintering additives using high-pure A2O3 powder as raw materials and using sample slurry casting method. With analysis instruments, such as X-ray diffraction, scanning electron microscopy and slurry viscosity, the effect of slurry viscosity, sedimentation volume and other properties was studied by means of PH, alumina particle size, dosage of water reducer and white clay, while studying the sintering temperature of green body doped with various additives.Results show that the slurry after grinding through 9h using A2O3 (3.67μm),7wt% white clay powder, adding 0.1 wt% sodium tripolyphosphate and the amount of water would show the smallest sedimentation volume and viscosity; alumina ceramic crucible firing anode material of lithium batteries introduced 4wt%SiO2-2wt%Si-1.5wt%CaF2-0.3wt%V2O5 composite additives were prepared after sintering at 1550℃in air for 3h, which is good tightness not leaking water with bulk density 3.19g/cm3, porosity 4.77%.