Volume 58, Issue 31 pp. 10478-10485
Research Article

Oxygen Vacancy Diffusion and Condensation in Lithium-Ion Battery Cathode Materials

Dr. Sanghan Lee

Dr. Sanghan Lee

Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Republic of Korea

These authors contributed equally to this work.

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Wooyoung Jin

Wooyoung Jin

Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Republic of Korea

These authors contributed equally to this work.

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Su Hwan Kim

Su Hwan Kim

Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Republic of Korea

These authors contributed equally to this work.

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Se Hun Joo

Se Hun Joo

Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Republic of Korea

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Dr. Gyutae Nam

Dr. Gyutae Nam

Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Republic of Korea

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Prof. Pilgun Oh

Prof. Pilgun Oh

Department of Graphic Arts Information Engineering, Pukyong National University, Busan, 48547 Republic of Korea

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Young-Ki Kim

Young-Ki Kim

UNIST Central Research Facilities, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Republic of Korea

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Prof. Sang Kyu Kwak

Corresponding Author

Prof. Sang Kyu Kwak

Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Republic of Korea

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Prof. Jaephil Cho

Corresponding Author

Prof. Jaephil Cho

Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Republic of Korea

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First published: 22 May 2019
Citations: 143

Graphical Abstract

Oxygen vacancies (OV) are native defects in transition metal oxides and their presence has a critical effect on the physicochemical properties of the oxide. Studies reveal that OV diffusion leads to their condensation along a specific lattice plane, resulting in the formation of lattice mismatches and microcracks in single-crystal cathode materials.

Abstract

Oxygen vacancies (OV) are native defects in transition metal (TM) oxides and their presence has a critical effect on the physicochemical properties of the oxide. Metal oxides are commonly used in lithium-ion battery (LIB) cathodes and there is still a lack of understanding of the role of OVs in LIB research field. Here, we report on the behavior of OVs in a single-crystal LIB cathode during the non-equilibrium states of charge and discharge. We found that microcrack evolution in a single crystal occurs due to OV condensation in specific crystallographic orientations generated by the continuous migration of OVs and TM ions. Moreover, understanding the effects of the presence and diffusion of OVs in metal oxides enables the elucidation of most of the conventional mechanisms of capacity fading in LIBs and provides new insights for new electrochemical applications.

Conflict of interest

The authors declare no conflict of interest.

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