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Title: Nitrogen configuration dependent holey active sites toward enhanced K+ storage in graphite foam
Authors: Wang, Huanhuan
Yang, Guang
Chen, Zhen
Liu, Jilei
Fan, Xiaofeng
Liang, Pei
Huang, Yizhong
Lin, Jianyi
Shen, Zexiang
Keywords: Engineering::Materials
Issue Date: 2019
Source: Wang, H., Yang, G., Chen, Z., Liu, J., Fan, X., Liang, P., . . . Shen, Z. (2019). Nitrogen configuration dependent holey active sites toward enhanced K+ storage in graphite foam. Journal of Power Sources, 419, 82–90. doi:10.1016/j.jpowsour.2019.02.029
Journal: Journal of Power Sources
Abstract: The nitrogen doping generally plays an important role in alkali-ion storage. Herein the nitrogen doping effect on K+ storage in graphite foam is explored. Experimental and theoretical calculations reveal that the K+ storage behavior is strongly dependent on nitrogen doping concentration and doping configurations. Specifically, high doping level i) provides more pyridinic/pyrrolic nitrogen content, thus creating more holey structures for K+ storage, ii) enlarges interlayer spacing to facilitate K+ intercalation, and iii) increases electronic conductivity to ensure fast kinetics. For the first time, we proved that the holey structure, rather than nitrogen doping, contributes to the capacity enhancement for carbon-based potassium ion batteries. Our investigations promote better understanding of K+ ion storage mechanism in doped graphite and provide invaluable guidance to optimize carbon-based electrode design for high-performance potassium ion batteries.
ISSN: 0378-7753
DOI: 10.1016/j.jpowsour.2019.02.029
Rights: © 2019 Elsevier B.V. All rights reserved. This paper was published in Journal of Power Sources and is made available with permission of Elsevier B.V.
Fulltext Permission: embargo_20211231
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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