Abstract: The present invention relates to a solution based method for preparing an nano scale electroactive metal polyanion or a mixed metal polyanion comprising reacting metal sulfate—M(SO4)x and/or other soluble metal salts, here M could be iron, cobalt, manganese, nickel or mixtures thereof, with a solution of sodium hydroxide with addition of solution of ammonium hydroxide, in the presence of water, drying the nano-intermediate M(OH)2 or M1M2(OH)2 or M1M2M3(OH)2, or MO(OH) or M1M2O(OH) or M1M2M3O(OH), mixing the dried intermediate with a soluble lithium precursor and soluble PO4 containing precursor and a soluble polymer carbon, well mixed the mixture, and then removing said solvent at a temperature and for a time sufficient to remove the solvent and form an essentially dried mixture; and heating said mixture at a temperature and for a time sufficient to produce an electroactive metal polyanion or electroactive mixed metal polyanion.