Journal
CHEMICAL ENGINEERING JOURNAL
Volume 387, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124061
Keywords
K-ion batteries; ZnSe; Nanorods; Anode; Carbon-encapsulation; Core-shell structure
Categories
Funding
- National Natural Science Foundation of China [51771076]
- Innovative Research Groups of the National Natural Science Foundation of China [NSFC51621001]
- Guangdong Pearl River Talents Plan [2017GC010218]
- Guangzhou Science and Technology Plan Projects [201804010104]
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Potassium-ion batteries (KIBs) have now stimulated considerable attention due to the widely distributed potassium salt and low cost, which become the competitive candidate for Na-/Li-ion batteries and suitable application for large-scale energy systems. Here, we have reasonably designed N-doped carbon encapsulated yolk-shell ZnSe@C anode with carbon-coated Zn2GeO4@C nanorods as the self-sacrificial template. Uniform ZnSe@C nanorods were facilely prepared by the selenidation of carbon-coated Zn2GeO4@C nanorods, which were synthesized via a simple annealing of ploydopamine-coated Zn2GeO4 nanorods. Such N-doped carbon encapsulated ZnSe@C core-shell nanorods could substantially enhance the electronic conductivity, moderate the volume expansion and provide more pathways for K+ diffusion. In detail, these ZnSe@C nanorods achieve stable galvanostatic discharge/charge performance (deliver 360 mA h g(-1) at 0.2 A g(-1) after 60 cycles and 204 mA h g(-1) at 2.0 A g(-1) over 100 repeated cycles) and superior rate capability (achieve a capacities of 389.4, 379.8, 352.2, 285.6, 226.1, and 167.5 mA h g(-1) at 0.1, 0.2, 0.5, 1.0, 2.0, and 4.0 A g(-1), respectively). The charge-discharge mechanism of ZnSe@C was further investigated by in-situ, ex-situ X-ray diffraction XRD and transmission electron microscopy (TEM) measurements.
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