Ferrous phosphate 2) powders, lithium iron phosphate powders for a Li-ion battery and methods for manufacturing the same are provided. The heating device includes at least one heating element positioned opposite at least one other heating element to form a slot between heating surfaces of the elements for receiving food product. The data structure may include a sub-root log to store successive supertypes of the data structure type hierarchy. The oligomers may be created in-situ using standard polymerization of monomeric reactants chemistry using a solvent or may be provided as a pre-imidized compound that may be either a solid or liquid. 5% ww of a polyacrylic acid, from 0.