Towards a green and cost-effective synthesis of polyanionic cathodes: comparative electrochemical behaviour of LiFePO4/C, Li2FeP2O7/C and Li2FeSiO4/C synthesized using methylcellulose matrix

The polyanion cathodes for Li-ion batteries, namely LiFePO4, Li2FeP2O7 and Li2FeSiO4, were synthesized by very short high-temperature treatment (approximately several minutes) subsequent quenching. Methylcellulose—a polymer with thermally driven water solubility—was used as the medium in which precursor solutions dispersed prior to high temperature treatment. methylcellulose pyrolytically decomposes carbon, thus producing material/carbon composites of LiFePO4/C, Li2FeP2O7/C Li2FeSiO4/C. obtained powders have reduced crystallinity significant microstructural characteristics: low crystallite size notable microstrain. They exhibit stable electrochemical performances both aqueous organic electrolyte. broadening existing peaks cyclic voltammetry and/or emergence new broad was attributed presence amorphous phase samples. In galvanostatic charge–discharge tests, materials provided capacities at current densities, while highest rate performance demonstrated olivine-phosphate when compared other two materials.