Electrochemical effects of annealing on atomic layer deposited Al 2 O 3 coatings on LiNi 0.5 Mn 0.3 Co 0.2 O 2
| Autor: | David H. K. Jackson, Thomas F. Kuech |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Annealing (metallurgy) Analytical chemistry Energy Engineering and Power Technology 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode 0104 chemical sciences Dielectric spectroscopy law.invention X-ray photoelectron spectroscopy Coating law Electrode engineering Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Journal of Power Sources. 365:61-67 |
| ISSN: | 0378-7753 |
| Popis: | This study investigated the annealing of atomic layer deposited (ALD) Al2O3 coated onto Li-ion battery cathodes to enhance their electrochemical properties. LiNi0.5Mn0.3Co0.2O2 (NMC) cathode powders were coated with 5 ALD cycles at 100 °C, annealed between 300 and 700 °C, cast into electrode sheets and assembled into coin cells. Cells were characterized using charge-discharge cycling, electrochemical impedance spectroscopy, pre-casting and postmortem X-ray photoelectron spectroscopy, and charge endpoint slippage measurement. Diffusion of Al into bulk NMC was observable at ≥500 °C, and extent of diffusion increased with increasing temperature. Un-annealed ALD-coated cathodes showed exceptional capacity retention at high charge-discharge rates, while annealed cells showed recovery of initial charge capacity lost upon ALD coating. High quantities of LiF forming surface species were detected in cells annealed at 500 °C. This study approaches post-deposition annealing as a parameter that may be used to explore the electrochemical properties of ALD-coated battery cathodes. |
| Databáze: | OpenAIRE |
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