Article
Synchronous electrochemical evolution of electrode and performance enhancement of sodium ion battery anode

https://doi.org/10.1016/j.xcrp.2021.100553Get rights and content
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Highlights

  • The reconstructed Bi2Se3 and Se powder electrode structures are obtained for SIBs

  • The crucial role of Cu element deriving from Cu current collector is presented

  • The synchronous electrochemical evolution process is fully described

  • The reconstructed Se electrode delivers 529 mAh g−1 for 16,000 cycles at 20 A g−1

Summary

Irreversible structure evolution of electrode in the battery always leads to structure collapse and the lost activation of active material. To overcome this technical challenge, synchronous electrochemical reconstruction method is proposed. Herein, as a proof of concept, Bi2Se3 nanosheets are synthesized. It shows an outstanding electrochemical performance as the anode of sodium-ion battery, which is benefitted by structure evolution of Bi2Se3 electrode. More importantly, Cu element deriving from the current collector is detected, which plays a crucial role in this evolution, promoting the electrochemical reconstruction and stabilizing selenium element. The role of Cu is further verified by the Se powder anode. The reconstructed anode from Bi2Se3 nanosheet or pure selenium can not only provide a stable structure but also ensure a faster electronic and ionic diffusion channel, leading to an excellent cyclic and rate performance. Therefore, the reconstruction strategy will be a promising way for the design of electrode with high performance.

Keywords

electrode reconstructed
Cu element facilitation
three-dimensional crosslinked structure

Data and code availability

All of the data associated with this study are included in the article and the Supplemental information. Additional information is available from the lead contact upon reasonable request.

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