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Nanoparticles Li0.96Na0.04Ni1/3Co1/3Mn1/3O2 with PEG400 or PEG2000 as additive was synthesized by co-precipitation method.X-ray diffraction pattern reveals that both the products of Li0.96Na0.04Ni1/3Co1/3Mn1/3O2 with PEG400 and PEG2000 are pure phase.Scanning electron microscopy shows that the powders are disk with the average diameter of 100 nm and 80 nm,respectively.