@article{8be1db4919bb4b6eb3d368db159d5916,
title = "Mechanism of Degradation of Capacity and Charge/Discharge Voltages of High-Ni Cathode During Fast Long-Term Cycling Without Voltage Margin",
abstract = "The authors reveal the mechanisms of degradation of capacity, charge voltage, and discharge voltage of commercially-available high-nickel cathode material when it is cycled without a voltage margin by two different charge protocols: constant-current charging and constant-current, constant-voltage charging. With repeated constant-current charging, the cathode material changes to a non-periodic cation-mixed state, which causes a relatively low voltage degradation, whereas during constant-current, constant-voltage charging, the cathode material changes from a layered structure to a periodic cation-mixed spinel-like phase, with consequent severe voltage decay. This decay results from a reduction in the equilibrium electrode potential and an increase of overpotential which are aggravated in a periodic cation-mixed state. The findings provide insights into the use of excess Li without charge-voltage margin in high-Ni cathode materials.",
keywords = "STEM, cation mixing, electrode potential, high-nickel cathodes, lithium-ion batteries, overpotential",
author = "Park, {Jae Yeol} and Minji Jo and Seungki Hong and Seunggyu Park and Park, {Jae Ho} and Kim, {Yong Il} and Kim, {Sang Ok} and Chung, {Kyung Yoon} and Dongjin Byun and Kim, {Seung Min} and Wonyoung Chang",
note = "Funding Information: J.Y.P. and M.J. contributed equally to this work. The authors thank Jeong Doo Lee in the Institute of Advanced Composite Materials of Korea Institute of Science and Technology for the technical support of the focused ion beam. This work was supported by Korea Institute of Science and Technology (KIST) (Project No. 2E31861 and 2V09381) and National Research Foundation (NRF) of Korea (Grant No. 2020R1A2C2012056 and 2021R1A6A3A01086837). Funding Information: J.Y.P. and M.J. contributed equally to this work. The authors thank Jeong Doo Lee in the Institute of Advanced Composite Materials of Korea Institute of Science and Technology for the technical support of the focused ion beam. This work was supported by Korea Institute of Science and Technology (KIST) (Project No. 2E31861 and 2V09381) and National Research Foundation (NRF) of Korea (Grant No. 2020R1A2C2012056 and 2021R1A6A3A01086837) . Publisher Copyright: {\textcopyright} 2022 The Authors. Advanced Energy Materials published by Wiley-VCH GmbH.",
year = "2022",
month = aug,
day = "4",
doi = "10.1002/aenm.202201151",
language = "English",
volume = "12",
journal = "Advanced Energy Materials",
issn = "1614-6832",
publisher = "Wiley-VCH Verlag",
number = "29",
}
