Improvement of the high-temperature, high-voltage cycling performance of LiNi0.5Co0.2Mn0.3O2 cathode with TiO2 coating

► TiO2 coating improves cycling stability of LiNi0.5Co0.2Mn0.3O2 at 328 K and 4.4 V. ► TiO2 coating can prevent the increase of charge-transfer resistance (Rct). ► LiF/MFx species deposited on the electrode lead to capacity deterioration. ► The deposition of LiF/MFx species can be suppressed by TiO2 coating. ► TiO2 coating reduces metal dissolution at a highly delithiated state.