期刊
CHEMICAL ENGINEERING JOURNAL
卷 388, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124396
关键词
Potassium ion batteries; Anode; Ultrathin CoSe2 nanosheets; Chemical bonds; Carbon framework
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.
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