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Improvement of Thermodynamic Phase Stability and High-Rate Capability of Li Layered Oxides

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Title
Improvement of Thermodynamic Phase Stability and High-Rate Capability of Li Layered Oxides
Author(s)
Ji Hwan Kim; Hwang, Juncheol; Young-Hoon Lee; Song, Seok Hyun; Lee, Jaewoon; Lee, Si-Hwan; Moon, Won-Jin; Kim, Hyungsub; Kim, Duho; Yu, Seung-Ho; Yung-Eun Sung
Publication Date
2023-11
Journal
ACS Applied Materials and Interfaces, v.15, no.48, pp.55837 - 55847
Publisher
American Chemical Society
Abstract
The use of elemental doping in lithium cobalt oxide (LCO) cathode material at high cutoff voltage is a widely adopted technique in the field of rechargeable batteries to mitigate multiple unfavorable phase transitions. However, there is still a lack of fundamental understanding regarding the rationality of each doping element implemented in this method, specifically considering the various thermodynamic stability and phase transitions. Herein, we investigated the effect of Ti doping on an O2 phase LCO (LCTO) cathode material that exhibited enhanced rate performance. We suggest that the incorporation of Ti into an O2 phase LCO results in the mitigation of multiple-phase transitions and the improvement of phase stability, thereby yielding a high-rate-capable cathode material. Through a combination of experimental and computational calculations, we demonstrate that Ti doping improves the thermodynamic stability and kinetics of Li-ions during the cycling process. © 2023 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/14514
DOI
10.1021/acsami.3c13260
ISSN
1944-8244
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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