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A new energy storage system: Rechargeable potassium-selenium battery

Journal Article


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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¿3after 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.

Publication Date


  • 2017

Citation


  • Liu, Y., Tai, Z., Zhang, Q., Wang, H., Pang, W. Kong., Liu, H. Kun., Konstantinov, K. & Guo, Z. (2017). A new energy storage system: Rechargeable potassium-selenium battery. Nano Energy, 35 36-43.

Scopus Eid


  • 2-s2.0-85015412866

Ro Full-text Url


  • http://ro.uow.edu.au/context/aiimpapers/article/3635/type/native/viewcontent

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2589

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 36

End Page


  • 43

Volume


  • 35

Place Of Publication


  • Netherlands

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¿3after 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.

Publication Date


  • 2017

Citation


  • Liu, Y., Tai, Z., Zhang, Q., Wang, H., Pang, W. Kong., Liu, H. Kun., Konstantinov, K. & Guo, Z. (2017). A new energy storage system: Rechargeable potassium-selenium battery. Nano Energy, 35 36-43.

Scopus Eid


  • 2-s2.0-85015412866

Ro Full-text Url


  • http://ro.uow.edu.au/context/aiimpapers/article/3635/type/native/viewcontent

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2589

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 36

End Page


  • 43

Volume


  • 35

Place Of Publication


  • Netherlands