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LiNi_0.5Co_0.2Mn_0.3O₂ (NCM523) as cathode material has been the main cathode material for rechargeable Li-ion batteries due to its relatively high reversible capacity, low cost and low toxicity, However it has poor cycling stability at high rate and poor performance at elevated temperatures. Surface modification has been proved to be a effective approach to improve NCM523 cathode material. Since structural characteristics have direct effect on electrochemical performance, then structural changes due to coating process are very important. In the present work, NCM523 is coated with 1wt%, 3wt% and 5wt% of Li₂ZrO₃ through a sol – gel method in aqueous solution and charactrised by structural and electrochemical performance analysis.The coated sample with 1wt% Li₂ZrO₃ according to scaning electron microscopy (SEM) images has the highest level of uniformity of coating material on NCM523  particles and according to X-ray diffraction analysis presents the least crystal structure change  compare to other samples. Also according to transmission electron microscopy (TEM) images, the presence of coated material with a obvious boundary between LiNi_0.5Co_0.2Mn_0.3O₂ cathode material and Li₂ZrO₃ coated material is confirmed.. Altogether, the results proved that 1wt% Li₂ZrO₃ has the least structural Changes and this amount can be selected as an optimal amount for coating.

Keywords: Li-ion batteries, lithium nickel cobalt manganese oxide cathode material, Surface coating, Sol-gel processes

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