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A CoSe-C@C core-shell structure with stable potassium storage performance realized by an effective solid electrolyte interphase layer

Journal Article


Abstract


  • Conversion/alloying materials with high theoretical capacity are promising for potassium-ion batteries, although their development is seriously blocked owing to their volume expansion and ineffective solid-electrolyte interphase (SEI) protection. Herein, it is discovered that the performance of the CoSe anode material could be enhanced through a flexibly designed core-shell structure (denoted as CoSe-C@C) and an inorganic compound-rich SEI. The CoSe-C@C electrode exhibits stable cycling performance (432 mA h g-1 at 200 mA g-1) over 1000 cycles and outstanding rate capability (233 mA h g-1 at 10 A g-1). A reversible conversion mechanism for the potassiation/depotassiation in CoSe is revealed by ex situ X-ray diffraction patterns and high-resolution transmission electron microscope images, while the SEI on the CoSe-C@C surface is found to be inorganic-rich (KF-), which is favourable for K ion diffusion and charge transfer dynamics. These findings would shed light on nanostructure design strategies and our fundamental understanding of the SEI formation in electrolyte engineering for potassium-ion batteries. This journal is

UOW Authors


  •   Liu, Sailin (external author)
  •   Guo, Zaiping
  •   Zhang, Wenchao (external author)

Publication Date


  • 2021

Citation


  • Gu, X., Zhang, L., Zhang, W., Liu, S., Wen, S., Mao, X., . . . Guo, Z. (2021). A CoSe-C@C core-shell structure with stable potassium storage performance realized by an effective solid electrolyte interphase layer. Journal of Materials Chemistry A, 9(18), 11397-11404. doi:10.1039/d1ta01107c

Scopus Eid


  • 2-s2.0-85105757211

Start Page


  • 11397

End Page


  • 11404

Volume


  • 9

Issue


  • 18

Abstract


  • Conversion/alloying materials with high theoretical capacity are promising for potassium-ion batteries, although their development is seriously blocked owing to their volume expansion and ineffective solid-electrolyte interphase (SEI) protection. Herein, it is discovered that the performance of the CoSe anode material could be enhanced through a flexibly designed core-shell structure (denoted as CoSe-C@C) and an inorganic compound-rich SEI. The CoSe-C@C electrode exhibits stable cycling performance (432 mA h g-1 at 200 mA g-1) over 1000 cycles and outstanding rate capability (233 mA h g-1 at 10 A g-1). A reversible conversion mechanism for the potassiation/depotassiation in CoSe is revealed by ex situ X-ray diffraction patterns and high-resolution transmission electron microscope images, while the SEI on the CoSe-C@C surface is found to be inorganic-rich (KF-), which is favourable for K ion diffusion and charge transfer dynamics. These findings would shed light on nanostructure design strategies and our fundamental understanding of the SEI formation in electrolyte engineering for potassium-ion batteries. This journal is

UOW Authors


  •   Liu, Sailin (external author)
  •   Guo, Zaiping
  •   Zhang, Wenchao (external author)

Publication Date


  • 2021

Citation


  • Gu, X., Zhang, L., Zhang, W., Liu, S., Wen, S., Mao, X., . . . Guo, Z. (2021). A CoSe-C@C core-shell structure with stable potassium storage performance realized by an effective solid electrolyte interphase layer. Journal of Materials Chemistry A, 9(18), 11397-11404. doi:10.1039/d1ta01107c

Scopus Eid


  • 2-s2.0-85105757211

Start Page


  • 11397

End Page


  • 11404

Volume


  • 9

Issue


  • 18