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A Kinetic Indicator of Ultrafast Nickel-Rich Layered Oxide Cathodes

Cited 8 time in Web of Science Cited 8 time in Scopus
Authors

Wang, Jian; Hyun, Hyejeong; Seo, Sungjae; Jeong, Kyeongjae; Han, Jeongwoo; Jo, Sugeun; Kim, Hwiho; Koo, Bonho; Eum, Donggun; Kim, Juwon; Chung, Jinkyu; Cho, Hoon-Hwe; Han, Heung Nam; Shin, Tae Joo; Ni, Meng; Kang, Kisuk; Lim, Jongwoo

Issue Date
2023-06
Publisher
American Chemical Society
Citation
ACS Energy Letters, Vol.8 No.7, pp.2986-2995
Abstract
Elucidating high-rate cycling-induced nonequilibriumelectrodereactions is crucial for developing extreme fast charging (XFC) batteries.Herein, we unveiled the distinct rate capabilities of a series ofNi-rich layered oxide (NRLO) cathodes by quantitatively establishingtheir dynamic structure-kinetics relationships. Contrary toconventional views, we discovered electrode kinetic properties obtained ex-situ near equilibrium states failed to assess the effectiverate capability of NRLOs at ultrafast C rates. Further, the kineticphase heterogeneity, characterized by the dynamic separations in in-situ X-ray diffraction patterns and deviations in NRLO c-axis lattice parameters, exclusively correlated with thecapacity reduction under XFC and became an effective indicator ofthe NRLO rate capability. Enhancing the cycling temperature boostedthe rate capability of studied NRLOs by similar to 10%, which was furtherverified to mitigate the kinetic phase heterogeneity during XFC. Overall,this study lays the groundwork for tuning the kinetic phase heterogeneityof electrodes to develop ultrafast batteries.
ISSN
2380-8195
URI
https://hdl.handle.net/10371/194673
DOI
https://doi.org/10.1021/acsenergylett.3c00513
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