期刊
NANO RESEARCH
卷 14, 期 10, 页码 3552-3561出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-021-3657-8
关键词
core-shell; pseudocapacitance; in-situ X-ray diffraction (XRD); first principle calculations; potassium-ion batteries
类别
资金
- Academy of Sciences large apparatus United Fund [U1832187]
- National Nature Science Foundation of China [22071135]
- Nature Science Foundation of Shandong Province [ZR2019MEM030]
The novel nickel selenide nanoparticles encapsulated in nitrogen-doped carbon anode for PIBs exhibit superior rate performance and cyclic stability, with high reversible capacity and excellent cycling life.
Potassium-ion batteries (PIBs) are promising candidates for next-generation energy storage devices due to the earth abundance of potassium, low cost, and stable redox potentials. However, the lack of promising high-performance electrode materials for the intercalation/deintercalation of large potassium ions is a major challenge up to date. Herein, we report a novel uniform nickel selenide nanoparticles encapsulated in nitrogen-doped carbon (defined as NiSe@NC) as an anode for PIBs, which exhibits superior rate performance and cyclic stability. Benefiting from the unique hierarchical core-shell like nanostructure, the intrinsic properties of metal-selenium bonds, synergetic effect of different components, and a remarkable pseudocapacitance effect, the anode exhibits a very high reversible capacity of 438 mA center dot h center dot g(-1) at 50 mA center dot g(-1), an excellent rate capability, and remarkable cycling performance over 2,000 cycles. The electrochemical mechanism were investigated by the in-situ X-ray diffraction, ex-situ high-resolution transmission electron microscopy, selected area electron diffraction, and first principle calculations. In addition, NiSe@NC anode also shows high reversible capacity of 512 mA center dot h center dot g(-1) at 100 mA center dot g(-1) with 84% initial Coulombic efficiency, remarkable rate performance, and excellent cycling life for sodium ion batteries. We believe the proposed simple approach will pave a new way to synthesize suitable anode materials for secondary ion batteries.
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