A NiCoSex/CG heterostructure with strong interfacial interaction showing rapid diffusion kinetics as a flexible anode for high-rate sodium storage

Flexible sodium-ion batteries (SIBs) have aroused great interest in energy storage devices. However, the choice of suitable anode materials is a key step in the application of SIBs. Here, a simple vacuum filtration method is reported to obtain a bimetallic heterojunction structure. The heterojunctio...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2023-04, Vol.52 (16), p.5192-5201
Main Authors: Li, Dan, Liu, Honglang, Liu, Hanhao, Chen, Yanjun, Wang, Chao, Guo, Li
Format: Article
Language:English
Subjects:
Anodes
Battery cycles
Bimetals
Bridges
Diffusion rate
Electric fields
Electrode materials
Electron transfer
Electron transport
Energy storage
Folding
Heterojunctions
Heterostructures
Interface stability
Oxygen
Sodium-ion batteries
Structural stability
Vacuum filtration
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Summary:Flexible sodium-ion batteries (SIBs) have aroused great interest in energy storage devices. However, the choice of suitable anode materials is a key step in the application of SIBs. Here, a simple vacuum filtration method is reported to obtain a bimetallic heterojunction structure. The heterojunction exhibits better performance than any single-phase material in sodium storage. The results show that the electron rich Se site and the internal electric field generated by the electron transfer in the heterojunction structure can provide rich electrochemically active areas and effectively promote the electron transport during sodiation/desodiation. More attractively, the strong interfacial interaction in the interface on the one hand maintains the stability of the structure and on the other hand promotes the diffusion of electrons. The NiCoSex/CG heterojunction with a strong oxygen bridge exhibits a high reversible capacity of 338 mA h g−1 at 0.1 A g−1, and an ignorable capacity attenuation at 2 A g−1 for 2000 cycles. The flexible full battery still shows good reversibility and output stability under bending and crimping. This idea of obtaining high-performance anodes by designing a heterojunction structure and constructing an oxygen bridge can provide a new vision for the design of other materials.
ISSN:1477-9226
1477-9234
DOI:10.1039/d3dt00273j