Volume 62, Issue 35 e202307874
Communication

Boosting Fe Cationic Vacancies with Graphdiyne to Enhance Exceptional Pseudocapacitive Lithium Intercalation

Jingchi Gao

Jingchi Gao

Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

Contribution: Data curation (lead), Formal analysis (equal), Methodology (lead)

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Xingru Yan

Xingru Yan

Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

Contribution: Formal analysis (supporting)

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Prof. Changshui Huang

Corresponding Author

Prof. Changshui Huang

Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

Contribution: Conceptualization (lead), Methodology (lead), Supervision (lead), Writing - review & editing (lead)

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Zhihui Zhang

Zhihui Zhang

Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

Contribution: Formal analysis (supporting)

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Xinlong Fu

Xinlong Fu

Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

Contribution: Formal analysis (supporting)

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Qian Chang

Qian Chang

Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 P. R. China

Contribution: Formal analysis (supporting)

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Prof. Feng He

Corresponding Author

Prof. Feng He

Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 P. R. China

Contribution: Formal analysis (supporting), Methodology (equal)

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Meiping Li

Meiping Li

Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion, Science Center for Material Creation and Energy Conversion, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, 266237 P. R. China

Contribution: Formal analysis (supporting)

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Prof. Yuliang Li

Corresponding Author

Prof. Yuliang Li

Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

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First published: 05 July 2023
Citations: 10

Graphical Abstract

Graphdiyne as anode material in Li-ion batteries can realize effective charge transfer to induce the formation of a high number of Fe vacancies with uniform dispersion. The Fe vacancies modulate charge distribution, serve as active sites and enhance electron-ion transportation, thereby displaying robust pseudocapacitive behavior. The Fe vacancies also reduce the diffusion energy barrier and adsorption energies, leading to a superior battery performance.

Abstract

Modulating the electronic structure of electrode materials at atomic level is the key to controlling electrodes with outstanding rate capability. On the basis of modulating the iron cationic vacancies (IV) and electronic structure of materials, we proposed the method of preparing graphdiyne/ferroferric oxide heterostructure (IV-GDY-FO) as anode materials. The goal is to motivate lithium-ion batteries (LIBs) toward ultra-high capacity, superior cyclic stability, and excellent rate performance. The graphdiyne is used as carriers to disperse Fe3O4 uniformly without agglomeration and induce high valence of Fe with reducing the energy in the system. The presence of Fe vacancy could regulate the charge distribution around vacancies and adjacent atoms, leading to facilitate electronic transportation, enlarge the lithium-ion diffusion, and decrease Li+ diffusion barriers, and thus displaying significant pseudocapacitive process and advantageous lithium-ion storage. The optimized electrode IV-GDY-FO reveals a capacity of 2084.1 mAh g−1 at 0.1 C, superior cycle stability and rate performance with a high specific capacity of 1057.4 mAh g−1 even at 10 C.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.