title: Atomic Layer Deposited MgO: A Lower Overpotential Coating for Li[Ni0.5Mn0.3Co0.2]O2Cathode.
abstract: An ultrathin MgO coating was synthesized via atomic layer deposition (ALD) to improve the surface properties of the Li[Ni0.5Mn0.3Co0.2]O2(NMC) cathode. An in-situ quartz crystal sensor was used to monitor the "self-limiting" surface reactions during ALD process and estimate the density of the deposited film. The electrochemical performance of the MgO-coated NMC cathode was evaluated in a half-cell assembly and compared to other ALD-based coatings, such as Al2O3and ZrO2. Cyclic voltammetry studies suggested that ALD MgO has a higher Li-diffusion coefficient which resulted in lower overpotential on the NMC cathode surface and improved Li-ion battery rate performance. MgO-coated NMC also yielded improved capacity retention over uncoated NMC in a long-range cycling test.
authors.affiliation: Department of Chemical and Biological Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.
authors.forename: Masihhur R
authors.identifier: http://orcid.org/0000-0002-1194-0722
authors.initials: MR
authors.lastname: Laskar
authors.affiliation: Department of Chemical and Biological Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.
authors.forename: David H K
authors.initials: DH
authors.lastname: Jackson
authors.affiliation: Department of Material Science and Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.
authors.forename: Shenzhen
authors.identifier: http://orcid.org/0000-0001-7268-9917
authors.initials: S
authors.lastname: Xu
authors.affiliation: Department of Chemistry, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.
authors.forename: Robert J
authors.identifier: http://orcid.org/0000-0003-3821-9625
authors.initials: RJ
authors.lastname: Hamers
authors.affiliation: Department of Material Science and Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.
authors.forename: Dane
authors.identifier: http://orcid.org/0000-0002-4911-0046
authors.initials: D
authors.lastname: Morgan
authors.affiliation: Department of Chemical and Biological Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Kuech
keywords: Li-ion battery; MgO; NMC; atomic layer deposition; cathode; coating