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Title: | Correlation between the microstructure of carbon materials and their potassium ion storage performance | Authors: | Lin, X Huang, J Zhang, B |
Issue Date: | Mar-2019 | Source: | Carbon, Mar. 2019, v. 143, p. 138-146 | Abstract: | Alkali-metal ions storage in carbon materials is of great interests for developing high-performance anodes for batteries. While Li, Na ions storage has been extensively investigated, systematic studies on the correlation between K ions storage and carbon microstructure have rarely been conducted. The large radius of K ions leaves a legitimate question whether the charge storage sites for Li and Na ions are also active for K ions. Herein, electrospun carbon nanofibers are employed as model materials to explore the K-ion storage behaviors in carbon with representative microstructures. By combining in-situ characterization and theoretical calculations, three active sites have been unveiled, including (i) uptake of K-ion by defect sites; (ii) K ions adsorption on isolated graphene sheets in partially disordered carbon; (iii) K ions intercalation between graphene layers for carbon with a high degree of graphitization. A similar reversible capacity around 280 mAh/g is obtained for various carbon structures while their voltage profiles are highly disparate. Remarkably, it is found that non-graphitic carbon presents better rate capability and less temperature-dependence due to the faster ion diffusion. These findings offer new insights into the design of advanced carbon anode materials with tunable properties for K-ion batteries. | Keywords: | Anodes Carbon In-situ characterization K-ion batteries |
Publisher: | Pergamon Press | Journal: | Carbon | ISSN: | 0008-6223 | EISSN: | 1873-3891 | DOI: | 10.1016/j.carbon.2018.11.001 | Rights: | © 2018 Elsevier Ltd. All rights reserved. © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ The following publication Lin, X., Huang, J., & Zhang, B. (2019). Correlation between the microstructure of carbon materials and their potassium ion storage performance. Carbon, 143, 138-146 is available at https://doi.org/10.1016/j.carbon.2018.11.001. |
Appears in Collections: | Journal/Magazine Article |
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