Superior corrosion resistance KAlSi2O6-containing materials for calcining Li-ion battery cathode materials

Guided by the corrosion mechanism in contact with Li(NixCoyMnz)O-2 materials, a method was developed by wrapping refractory grains with a KAlSi2O6 (KAS(4)) layer for corrosion protection during the calcination of Li-ion battery (LIB) cathode materials. Preformed or in-situ KAS(4) surrounds around refractory grains as a corrosion barrier by physically separating their contact with LIB materials. Because KAS(4) did not react (or reacted little) with LIB materials, materials having in-situ or preformed KAS(4) exhibit superior corrosion resistance, and in-situ KAS(4) improves the corrosion resistance more. Additionally, the in-situ or preformed KAS(4) also improves the thermomechanical properties of the prepared materials.