TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (Claimed): Synthesizing composite material, comprises: providing lithium-manganese-oxide material as a precursor; leaching manganese from the lithium-manganese-oxide material using an acid to form a synthesized solution; adding carbonaceous material to the synthesized solution; adding phosphoric acid to the synthesized solution with carbonaceous material to form manganese(III) phosphate composite material; and adding lithium containing compound to the manganese(III) phosphate composite material to form lithium manganese phosphate composite material Preferred Components: In the composite material, the molar ratio of lithium manganese phosphate to lithium-manganese-oxide is 1.8:0.1, preferably 1:0.5. Preferred Method: The method further comprises: after adding the carbonaceous material, cooling down the synthesized material with carbonaceous material, where the phosphoric acid is added while the synthesized material is still cooled. In the method, formic acid is added to manganese(III) phosphate composite material before the lithium containing compound is added. The method further comprises: after adding lithium containing compound, heating the lithium manganese phosphate composite material to produce foaming; after adding lithium containing compound, drying the lithium manganese phosphate composite material using a furnace under air or oxygen atmosphere, where temperature of the furnace does not exceed 200 degrees C, preferably does not exceed 160 degrees C during a drying time of 10 hours; after drying the lithium manganese phosphate composite material, further heating the synthesized material at or above 260 degrees C for 2 hours to aid in decomposition of the carbonaceous material; and after adding lithium containing compound to manganese(III) phosphate composite material to form lithium manganese phosphate composite material, further heating synthesized material to a temperature below 400 degrees C.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The acid comprises an organic acid. The acid is one of oxalic acid, formic acid, acetic acid, hydrochloric acid or nitric acid. The carbonaceous material comprises one of sucrose, methyl cellulose, methylcarboxylmethyl cellulose, cellulose acetate, starch or styrene butadiene rubber. EXAMPLE - Initially 11.25 g of oxalic acid was dissolve in 40 g of carboxymethyl cellulose at 80 degrees C to obtain the solution, then 90.5 g of lithium manganese oxide was added to the solution. The solution was kept at 80 degrees C for two hours until reaction was completed. Then 33.75 g of sucrose was added and the solution was cooled using ice bath, and 57.65 g of phosphoric acid was added to the solution slowly (in two hours) in ice bath. Then the solution was warmed to 50 degrees C for two hours (at this moment, greenish powder was formed) and waited until the solution become tacky. Heat treatment was conducted by sending the precursor material directly to the furnace at 380 degrees C for 10 hours under oxygen.