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https://hdl.handle.net/2440/132733
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Type: | Journal article |
Title: | A new energy storage system: rechargeable potassium-selenium battery |
Author: | Liu, Y. Tai, Z. Zhang, Q. Wang, H. Pang, W.K. Liu, H.K. Konstantinov, K. Guo, Z. |
Citation: | Nano Energy, 2017; 35:36-43 |
Publisher: | Elsevier |
Issue Date: | 2017 |
ISSN: | 2211-2855 2211-3282 |
Statement of Responsibility: | Yajie Liu, Zhixin Tai, Qing Zhang, Hongqiang Wang, Wei Kong Pang, Hua Kun Liu ... et al. |
Abstract: | A new reversible and high-performance potassium-selenium (K-Se) battery, using confined selenium/carbonized-polyacrylonitrile (PAN) composite (c-PAN-Se) as cathode and metallic potassium as anode, is reported in this work. The PAN-derived carbon matrix could effectively confine the small Se molecules and provide a sufficient buffer for the volume changes. The reversible formation of small-molecule trigonal Se (Se1, P3121) phase could essentially inhibit the formation of polyselenides and account for outstanding electrochemical performance. The carbonate-based electrolyte further synergistically diminishes the shuttle effect by inhibiting the formation of polyselenides in the meantime. The as-prepared K-Se battery shows a reversible capacity of 1904 mAh cm−3 after 100 cycles at 0.2 C and rate retention of 89% from 0.1 to 2 C. In addition, the charge-discharge mechanism is also investigated via the combination of in-situ and ex-situ synchrotron X-ray diffraction (XRD), and Raman spectroscopy analysis. The results reveal that the introduction of K+ ions leads to the cleavage of C-Se bonds, the rearrangement of selenium atoms, and the final formation of the main product K2Se. Moreover, the reversible formation of trigonal Se (Se1, P3121) phase was detected in the reaction with K+. These findings not only can advance our understanding of this family of batteries, but also provide insight into chemically-bonded selenium composite electrodes, which could give guidance for scientific research and the optimization of Se and S electrodes for the K-S, Na-S, Li-S, Na-Se, and Li-Se batteries. |
Keywords: | Potassium-selenium batteries (K-Se batteries); small molecule; selenium cathodes; selenium/carbonized-pan composite; potassium anode |
Rights: | © 2017 Elsevier Ltd. All rights reserved. |
DOI: | 10.1016/j.nanoen.2017.03.029 |
Grant ID: | http://purl.org/au-research/grants/arc/FT150100109 http://purl.org/au-research/grants/arc/FT160100251 |
Published version: | http://dx.doi.org/10.1016/j.nanoen.2017.03.029 |
Appears in Collections: | Chemistry and Physics publications |
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