Aluminum interdiffusion into LiCoO2 using atomic layer deposition for high rate lithium ion batteries
Teranishi, Takashi; Yoshikawa, Yumi; Yoneda, Mika; Kishimoto, Akira; Halpin, Jennifer; O'Brien, Shane; Modreanu, Mircea; Povey, Ian M.
Date:
2018-06-18
Copyright:
© 2018 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Energy Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/abs/10.1021/acsaem.8b00496
Citation:
Teranishi, T., Yoshikawa, Y., Yoneda, M., Kishimoto, A., Halpin, J., O’Brien, S., Modreanu, M. and Povey, I. M. (2018) 'Aluminum Interdiffusion into LiCoO2 Using Atomic Layer Deposition for High Rate Lithium Ion Batteries', ACS Applied Energy Materials, 1(7), pp. 3277-3282. doi: 10.1021/acsaem.8b00496
Abstract:
Here, as with previous work, atomic layer deposition (ALD) has been used to deposit Al2O3 on positive electrode active materials, LiCoO2, to create a protective barrier layer, suppress the high potential phase transition, and thus reduce the subsequent Co dissolution. However, in this study it was found that it also resulted in the reduction of the charge transfer resistance at the positive electrode–electrolyte interface, thus enhancing the performance of the battery. Energy-dispersive X-ray spectroscopy, in conjunction with transmission electron microscopy, shows that a discrete Al2O3 shell was not formed under the selected growth conditions and that the Al diffused into the bulk LiCoO2. The resulting active oxide material, which was significantly thicker than the nominally ALD growth rate would predict, is proposed to be of the form LiCoO2:Al with amorphous and crystalline regions depending on the Al content. The cells consisting of the modified electrodes were found to have good cycling stability and discharge capacities of ∼110 mA h g–1 (0.12 mA h cm–2) and ∼35 mA h g–1 (0.04 mA h cm–2) at 50 and 100 C, respectively.
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