Atomic Layer Deposited MgO: A Lower Overpotential Coating for Li[Ni0.5Mn0.3Co0.2]O2 Cathode
| Autor: | Shenzhen Xu, David H. K. Jackson, Dane Morgan, Masihhur R. Laskar, Robert J. Hamers, Thomas F. Kuech |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Analytical chemistry 02 engineering and technology engineering.material Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode 0104 chemical sciences law.invention Crystal Atomic layer deposition Coating law engineering General Materials Science Cyclic voltammetry 0210 nano-technology Layer (electronics) |
| Zdroj: | ACS Applied Materials & Interfaces. 9:11231-11239 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | 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 Al2O3 and 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. |
| Databáze: | OpenAIRE |
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