Porous carbon microspheres with highly graphitized structure for potassium-ion storage.

Autor: Choi SH; Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA., Baucom J; Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA., Li X; Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA., Shen L; Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA., Seong YH; Energy Materials Laboratory, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea., Han IS; Energy Materials Laboratory, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea., Choi YJ; Busan Center, Korea Basic Science Institute, 30, Gwahaksandan 1-ro 60beon-gil, Gangseo-gu, Busan 46742, Republic of Korea., Ko YN; Carbon Conversion Research Laboratory, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea. Electronic address: koyouna@kier.re.kr., Kim HJ; Electron Microscopy Research Center, Korea Basic Science Institute, 169-148 Gwahak-ro, Yuseong-gu, Daejeon 34133, Republic of Korea. Electronic address: hansol@kbsi.re.kr., Lu Y; Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA. Electronic address: luucla@ucla.edu.
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2020 Oct 01; Vol. 577, pp. 48-53. Date of Electronic Publication: 2020 May 18.
DOI: 10.1016/j.jcis.2020.05.051
Abstrakt: Porous carbon materials are promising candidates for anode materials in rechargeable potassium-ion batteries. However, their high surface area and low crystallinity usually cause side reactions with electrolytes and slanted charge/discharge profiles. Herein, we report the synthesis of porous carbon microspheres with highly graphitized structure and enhanced potassium-ion storage properties. The prepared carbon microspheres exhibit a low working potential of ~0.2 V, high Coulombic efficiency, and a stable reversible capacity of 292.0 mAh/g after 100 cycles, which is significantly higher than that of commercial graphite (137.5 mAh/g after 100 cycles). These desirable performances are attributed to the high crystallinity of carbon and its porous structure, which provide active sites for potassium-ion storage and alleviate the stress caused by the large volume change during the insertion and extraction of potassium ions.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: