Boosting the Electrochemical Performance of Li(1.2)Mn(0.54)Ni(0.13)Co(0.13)O(2) by Atomic Layer-Deposited CeO(2) Coating

[Image: see text] It has been demonstrated that atomic layer deposition (ALD) provides an initially safeguarding, uniform ultrathin film of controllable thickness for lithium-ion battery electrodes. In this work, CeO(2) thin films were deposited to modify the surface of lithium-rich Li(1.2)Mn(0.54)Ni(0.13)Co(0.13)O(2) (LRNMC) particles via ALD. The film thicknesses were measured by transmission electron microscopy. For electrochemical performance, ∼2.5 nm CeO(2) film, deposited by 50 ALD cycles (50Ce), was found to have the optimal thickness. At a 1 C rate and 55 °C in a voltage range of 2.0−4.8 V, an initial capacity of 199 mAh/g was achieved, which was 8% higher than that of the uncoated (UC) LRNMC particles. Also, 60.2% of the initial capacity was retained after 400 cycles of charge–discharge, compared to 22% capacity retention of UC after only 180 cycles of charge–discharge. A robust kinetic of electrochemical reaction was found on the CeO(2)-coated samples at 55 °C through electrochemical impedance spectroscopy. The conductivity of 50Ce was observed to be around 3 times higher than that of UC at 60–140 °C. The function of the CeO(2) thin-film coating was interpreted as being to increase substrate conductivity and to block the dissolution of metal ions during the charge–discharge process.