Lithium iron phosphate (LiFePO 4 ) nanoparticles and lithium iron phosphate/halloysite (inorganic nanotubes) (LiFePO 4 /INT) nanocomposites were prepared by ultrasound-assisted synthesis in an aqueous solution of lithium hydroxide containing ammonium dihydrogen phosphate and ferrous chloride and used as cathode materials in lithium ion batteries. The performance of the cathode material was measured using cyclic voltammetry. The oxidation potential for LiFePO 4 polyaniline/nanotubes/anode cell was found to be in the range of 21.12 to 1.063 V while the reduction potential for lithium iron phosphate cell was in the range of 21.03 to 1.15 V. POLYM. COMPOS., 00:000-000, 2015.