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https://hdl.handle.net/2440/131988
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Type: | Journal article |
Title: | Hollow-carbon-templated few-layered V₅S₈ nanosheets enabling ultrafast potassium storage and long-term cycling |
Other Titles: | Hollow-carbon-templated few-layered V5S8 nanosheets enabling ultrafast potassium storage and long-term cycling |
Author: | Li, L. Zhang, W. Wang, X. Zhang, S. Liu, Y. Li, M. Zhu, G. Zheng, Y. Zhang, Q. Zhou, T. Pang, W.K. Luo, W. Guo, Z. Yang, J. |
Citation: | ACS Nano, 2019; 13(7):7939-7948 |
Publisher: | American Chemical Society |
Issue Date: | 2019 |
ISSN: | 1936-0851 1936-086X |
Statement of Responsibility: | Li Li, Wenchao Zhang, Xing Wang, Shilin Zhang, Yajie Liu, Minhan Li, Guanjia Zhu, Yang Zheng, Qing Zhang, Tengfei Zhou, Wei Kong Pang, Wei Luo, Zaiping Guo and Jianping Yang |
Abstract: | Due to the abundant potassium resource on the Earth’s crust, researchers now have become interested in exploring high-performance potassium-ion batteries (KIBs). However, the large size of K+ would hinder the diffusion of K ions into electrode materials, thus leading to poor energy/power density and cycling performance during the depotassiation/potassiation process. So, few-layered V5S8 nanosheets wrapping a hollow carbon sphere fabricated via a facile hollow carbon template induced method could reversibly accommodate K storage and maintain the structure stability. Hence, the as-obtained V5S8@C electrode enables rapid and reversible storage of K+ with a high specific capacity of 645 mAh/g at 50 mA/g, a high rate capability, and long cycling stability, with 360 and 190 mAh/g achieved after 500 and 1000 cycles at 500 and 2000 mA/g, respectively. The excellent electrochemical performance is superior to the most existing electrode materials. The DFT calculations reveal that V5S8 nanosheets have high electrical conductivity and low energy barriers for K+ intercalation. Furthermore, the reaction mechanism of the V5S8@C electrode in KIBs is probed via the in operando synchrotron X-ray diffraction technique, and it indicates that the V5S8@C electrode undergoes a sequential intercalation (KV5S8) and conversion reactions (K2S3) reversibly during the potassiation process. |
Keywords: | potassium-ion batteries anode materials high power density cycling stability V5S8 nanosheets |
Rights: | © 2019 American Chemical Society |
DOI: | 10.1021/acsnano.9b02384 |
Published version: | http://dx.doi.org/10.1021/acsnano.9b02384 |
Appears in Collections: | Chemical Engineering publications |
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