N-doped carbon/ultrathin 2D metallic cobalt selenide core/sheath flexible framework bridged by chemical bonds for high-performance potassium storage

Guoquan Suo, Jiaqi Zhang, Dan Li, Qiyao Yu*, Wei (Alex) Wang, Meng He, Lei Feng, Xiaojiang Hou, Yanling Yang, Xiaohui Ye, Li Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

96 Citations (Scopus)

Abstract

Potassium-ion batteries (KIBs) have been considered as a promising alternative to lithium-ion batteries (LIBs) due to the diffusely distributed and low-cost potassium resources and high operating voltage. However, achieving satisfactory battery performance is still a main challenge for KIBs development. Here, ultrathin metallic cobalt selenide (CoSe2) nanosheets are successfully assembled onto three-dimensional nitrogen doped carbon foam (CSNS/NCF) bridged by Co-C and Co-N-C bonds as a flexible core/sheath framework for potassium storage. The CSNS/NCF not only features with large surface area for sufficient contact with electrolyte with fast electrons and K ions diffusion but also provides a robust network with strong chemical bonds for stable potassium storage. Density functional theory (DFT) calculations show that the barrier for K atom migration in ultrathin CoSe2 nanosheets is lower than that in bulk CoSe2. Benefiting from the above advantages, the optimized CSNS/NCF displays a high specific capacity of 335 mAh g−1 after 200 cycles at 50 mA g−1. This work provides a practical approach to construct advanced anode materials for KIBs systems.

Original languageEnglish
Article number124396
JournalChemical Engineering Journal
Volume388
DOIs
Publication statusPublished - 15 May 2020

Keywords

  • Anode
  • Carbon framework
  • Chemical bonds
  • Potassium ion batteries
  • Ultrathin CoSe nanosheets

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