TY - JOUR
T1 - A Kinetic Indicator of Ultrafast Nickel-Rich Layered Oxide Cathodes
AU - Wang, Jian
AU - Hyun, Hyejeong
AU - Seo, Sungjae
AU - Jeong, Kyeongjae
AU - Han, Jeongwoo
AU - Jo, Sugeun
AU - Kim, Hwiho
AU - Koo, Bonho
AU - Eum, Donggun
AU - Kim, Juwon
AU - Chung, Jinkyu
AU - Cho, Hoon-Hwe
AU - Han, Heung Nam
AU - Shin, Tae Joo
AU - Ni, Meng
AU - Kang, Kisuk
AU - Lim, Jongwoo
PY - 2023/7/14
Y1 - 2023/7/14
N2 - Elucidating high-rate cycling-induced nonequilibrium electrode reactions is crucial for developing extreme fast charging (XFC) batteries. Herein, we unveiled the distinct rate capabilities of a series of Ni-rich layered oxide (NRLO) cathodes by quantitatively establishing their dynamic structure–kinetics relationships. Contrary to conventional views, we discovered electrode kinetic properties obtained ex-situ near equilibrium states failed to assess the effective rate capability of NRLOs at ultrafast C rates. Further, the kinetic phase heterogeneity, characterized by the dynamic separations in in-situ X-ray diffraction patterns and deviations in NRLO c-axis lattice parameters, exclusively correlated with the capacity reduction under XFC and became an effective indicator of the NRLO rate capability. Enhancing the cycling temperature boosted the rate capability of studied NRLOs by ∼10%, which was further verified to mitigate the kinetic phase heterogeneity during XFC. Overall, this study lays the groundwork for tuning the kinetic phase heterogeneity of electrodes to develop ultrafast batteries. © 2023 American Chemical Society
AB - Elucidating high-rate cycling-induced nonequilibrium electrode reactions is crucial for developing extreme fast charging (XFC) batteries. Herein, we unveiled the distinct rate capabilities of a series of Ni-rich layered oxide (NRLO) cathodes by quantitatively establishing their dynamic structure–kinetics relationships. Contrary to conventional views, we discovered electrode kinetic properties obtained ex-situ near equilibrium states failed to assess the effective rate capability of NRLOs at ultrafast C rates. Further, the kinetic phase heterogeneity, characterized by the dynamic separations in in-situ X-ray diffraction patterns and deviations in NRLO c-axis lattice parameters, exclusively correlated with the capacity reduction under XFC and became an effective indicator of the NRLO rate capability. Enhancing the cycling temperature boosted the rate capability of studied NRLOs by ∼10%, which was further verified to mitigate the kinetic phase heterogeneity during XFC. Overall, this study lays the groundwork for tuning the kinetic phase heterogeneity of electrodes to develop ultrafast batteries. © 2023 American Chemical Society
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U2 - 10.1021/acsenergylett.3c00513
DO - 10.1021/acsenergylett.3c00513
M3 - RGC 21 - Publication in refereed journal
SN - 2380-8195
VL - 8
SP - 2986
EP - 2995
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 7
ER -