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Electrochemical effects of ALD surface modification on combustion synthesized LiNi1/3Mn1/3Co1/3O2 as a layered-cathode material |
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| Authors: | Leah A Riley Sky Van AttaAndrew S Cavanagh Yanfa YanSteven M George Ping LiuAnne C Dillon Se-Hee Lee |
| Affiliation: | a Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO 80309, USA b National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, CO 80401, USA c HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, CA 90265-4797, USA d Department of Physics, University of Colorado, Boulder, CO 80309, USA e Department of Chemistry and Biochemistry and Department of Chemical and Biological Engineering, University of Colorado at Boulder, Boulder, CO 80309-0215, USA |
| Abstract: | Combustion synthesized Li(Ni1/3Mn1/3Co1/3)O2 particles are coated with thin, conformal layers of Al2O3 by atomic layer deposition (ALD). XRD, Raman, and FTIR are used to confirm that no change to the bulk, local structure occurs after coating. Electrochemical impedance spectroscopy (EIS) results indicate that the surface of the Li(Ni1/3Mn1/3Co1/3)O2 are protected from dissolution and HF attack after only 4-layers, or ∼8.8 Å of alumina. Electrochemical performance at an upper cutoff of 4.5 V is greatly enhanced after the growth of Al2O3 surface film. Capacity retention is increased from 65% to 91% after 100 cycles at a rate of C/2 with the addition of only two atomic layers. Due to the conformal coating, the effects on Li(Ni1/3Mn1/3Co1/3)O2 overpotential and capacity are negligible below six ALD-layers. We propose that the use of ALD for coating on Li(Ni1/3Mn1/3Co1/3)O2 particles makes the material a stronger replacement candidate for LiCoO2 as a positive electrode in lithium ion batteries. |
| Keywords: | Atomic layer deposition Electrode/electrolyte SEI LiNi1/3Mn1/3Co1/3O2 |
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