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Defect engineering unveiled: Enhancing potassium storage in expanded graphite anode
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Type
Article
Citation
Zhang, K.-Y., Liu, H.-H., Su, M.-Y., Yang, J.-L., Wang, X.-T., Ang, E. H., Gu, Z.-Y., Zheng, S.-H., Heng, Y.-L., Liang, H.-J., Wang, Y., Li, S., & Wu, X.-L. (2024). Defect engineering unveiled: Enhancing potassium storage in expanded graphite anode. Journal of Colloid and Interface Science, 664, 607ā616. https://doi.org/10.1016/j.jcis.2024.03.084
Author
Zhang, Kai-Yang
ā¢
Liu, Han-Hao
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Su, Meng-Yuan
ā¢
Yang, Jia-Lin
ā¢
Wang, Xiao-Tong
ā¢
ā¢
Gu, Zhen-Yi
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Zheng, Shuo-Hang
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Heng, Yong-Li
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Liang, Hao-Jie
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Wang, Yinglin
ā¢
Li, Shuying
ā¢
Wu, Xing-Long
Abstract
Expanded graphite (EG) stands out as a promising material for the negative electrode in potassium-ion batteries. However, its full potential is hindered by the limited diffusion pathway and storage sites for potassium ions, restricting the improvement of its electrochemical performance. To overcome this challenge, defect engineering emerges as a highly effective strategy to enhance the adsorption and reaction kinetics of potassium ions on electrode materials. This study delves into the specific effectiveness of defects in facilitating potassium storage, exploring the impact of defect-rich structures on dynamic processes. Employing ball milling, we introduce surface defects in EG, uncovering unique effects on its electrochemical behavior. These defects exhibit a remarkable ability to adsorb a significant quantity of potassium ions, facilitating the subsequent intercalation of potassium ions into the graphite structure. Consequently, this process leads to a higher potassium voltage. Furthermore, the generation of a diluted stage compound is more pronounced under high voltage conditions, promoting the progression of multiple stage reactions. Consequently, the EG sample post-ball milling demonstrates a notable capacity of 286.2 mAh g-1 at a current density of 25 mA gā1, showcasing an outstanding rate capability that surpasses that of pristine EG. This research not only highlights the efficacy of defect engineering in carbon materials but also provides unique insights into the specific manifestations of defects on dynamic processes, contributing to the advancement of potassium-ion battery technology.
Date Issued
2024
Publisher
Elsevier
Journal
Journal of Colloid and Interface Science
Grant ID
2023YFE0202000
52102213
20230101128JC
jxsq2023102005
Funding Agency
National Key R&D Program of China
National Natural Science Foundation of China
Natural Science Foundation of Jilin Province
Double-Thousand Talents Plan of Jiangxi Province