Mechanism of Degradation of Capacity and Charge/Discharge Voltages of High-Ni Cathode During Fast Long-Term Cycling Without Voltage Margin

Jae Yeol Park; Minji Jo; Seungki Hong; Seunggyu Park; Jae Ho Park; Yong Il Kim; Sang Ok Kim; Kyung Yoon Chung; Dongjin Byun; Seung Min Kim; Wonyoung Chang

doi:10.1002/aenm.202201151

Mechanism of Degradation of Capacity and Charge/Discharge Voltages of High-Ni Cathode During Fast Long-Term Cycling Without Voltage Margin

Jae Yeol Park, Minji Jo, Seungki Hong, Seunggyu Park, Jae Ho Park, Yong Il Kim, Sang Ok Kim, Kyung Yoon Chung, Dongjin Byun, Seung Min Kim, Wonyoung Chang

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

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.

Original language	English
Article number	2201151
Journal	Advanced Energy Materials
Volume	12
Issue number	29
DOIs	https://doi.org/10.1002/aenm.202201151
Publication status	Published - 2022 Aug 4

Bibliographical 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:
© 2022 The Authors. Advanced Energy Materials published by Wiley-VCH GmbH.

Keywords

STEM
cation mixing
electrode potential
high-nickel cathodes
lithium-ion batteries
overpotential

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
General Materials Science

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1002/aenm.202201151

Cite this

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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.",

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AU - Jo, Minji

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AU - Park, Seunggyu

AU - Park, Jae Ho

AU - Kim, Yong Il

AU - Kim, Sang Ok

AU - Chung, Kyung Yoon

AU - Byun, Dongjin

AU - Kim, Seung Min

AU - Chang, Wonyoung

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PY - 2022/8/4

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N2 - 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.

AB - 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.

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KW - electrode potential

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KW - lithium-ion batteries

KW - overpotential

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Mechanism of Degradation of Capacity and Charge/Discharge Voltages of High-Ni Cathode During Fast Long-Term Cycling Without Voltage Margin

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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