The core of each sphere is a crystal of lithium iron phosphate. This acts as a standard battery material.
The positive electrodes are often made from lithium iron phosphate. Corvus, however, USES lithium nickel manganese cobalt (NMC) because it provides a greater energy density.
The study of the cycle difference property of commercial lithium iron phosphate
Research status of lithium iron phosphate as lithium-ion battery cathode material