(ANL), Argonne, IL (United States) Sponsoring Org.: USDOE Office of Science (SC), Basic Energy Sciences (BES) USDOE Office of Science (SC), Biological and Environmental Research (BER) OSTI Identifier: 1573301 Alternate Identifier(s): OSTI ID: 1579732 OSTI ID: 1607634 Report Number(s): PNNL-SA-145484 Journal ID: ISSN 0013-4651 /jes/166/15/A3679.atom Grant/Contract Number: AC05-76RL01830 AC02-06CH11357 Resource Type: Journal Article: Published Article Journal Name: Journal of the Electrochemical Society Additional Journal Information: Journal Name: Journal of the Electrochemical Society Journal Volume: 166 Journal Issue: 15 Journal ID: ISSN 0013-4651 Publisher: IOP Publishing - The Electrochemical Society Country of Publication: United States Language: English Subject: 25 ENERGY STORAGE Cathode Materials NMC Alumina Coating ALD MAS NMR TEM Batteries-Lithium Wet = , (PNNL), Richland, WA (United States) Argonne National Lab. Hughes, Barbara Trevey, James Dogan, Fulya Publication Date: Research Org.: Pacific Northwest National Lab. Search OSTI.GOV for author "Vaughey, John T.".This work proves that different coating protocols have critical influences on the atomic and chemical structures of surface alumina coatings as well as the electrochemical performance of the coated cathodes. On the other hand, ALD-coated samples are less influenced by the high-temperature annealing, showing good electrochemical performance both before and after the heat-treatment. Such strong interaction between cathode materials and alumina coatings during annealing is related to the Li extraction during the solution-based coating procedures. Using nuclear magnetic resonance and electron microscope characterizations, we found that high-temperature annealing can significantly affect the atomic and chemical structures of alumina coating layers formed byWC method, leading to the formation of more alpha-LiAlO2 buffer layer attached closely to the cathode particles and the improvement of electrochemical performance. In this work, we systematically compared two different synthesis approaches, wet chemical (WC) coating and atomic layer deposition (ALD), for alumina coatings on LiNi0.5Mn0.3Co0.2O2 (NMC532). However, the actual structures and functions of surface alumina coatings formed by different synthesis methods are still not clear. Surface alumina coating is an effective way to protect the cathode materials in lithium-ion batteries, particularly when operating under high voltages.
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