Hierarchical Multicavity Nitrogen‐Doped Carbon Nanospheres as Efficient Polyselenide Reservoir for Fast and Long‐Life Sodium‐Selenium Batteries

Xiang Hu; Junwei Li; Guobao Zhong; Jun Yuan; Shun Lei; Hongbing Zhan

doi:10.1002/smll.202005534

journal article Nov 04, 2020

Hierarchical Multicavity Nitrogen‐Doped Carbon Nanospheres as Efficient Polyselenide Reservoir for Fast and Long‐Life Sodium‐Selenium Batteries

Xiang Hu

Junwei Li

Guobao Zhong Jun Yuan

Shun Lei Hongbing Zhan

Small Vol. 16 No. 48 · Wiley

View at Publisher Save 10.1002/smll.202005534

Abstract

AbstractSodium‐selenium (Na‐Se) battery has been emerging as one of the most prospective energy storage systems owing to their high volumetric energy density and cost effectiveness. Nevertheless, the shuttle effect of sodium polyselenide (NaPSe) and sluggish electrochemical reaction kinetics present the main bottlenecks for its practical implementation. Herein, a new Se host of 3D nitrogen‐doped hierarchical multicavity carbon nanospheres (3D NHMCs) is designed and synthesized via a facile self‐sacrifice templating strategy. The 3D NHMCs are verified to hold a favorable structure of a hollow macropore core and numerous micro/mesopores hollow shell for hosting Se, which can not only maximize Se utilization and alleviate the volumetric expansion but also promote the electrical/ionic conductivity and electrolyte infiltration. Moreover, the abundant self‐functionalized surfaces as an efficient NaPSe scavenger via robust physical‐chemical dual blocking effects demonstrate high‐efficiency in situ anchoring‐diffusion‐conversion of NaPSe, rendering rapid reaction kinetics and remarkable suppressive shuttle effect, as evidenced by systematic experimental analysis and density functional theory calculations. As a result, the high‐Se‐loading 3D NHMCs/Se cathode exhibits an ultrahigh volumetric capacity (863 mAh cm−3) and rate capability (377 mAh g−1 at 20 C) and unexceptionable stability over 2000 cycles at 2 C.

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References

Details

Published: Nov 04, 2020
Vol/Issue: 16(48)
License: View

Authors

X

Xiang Hu

College of Materials Science and Engineering Fuzhou University Fuzhou 350108 China; CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China

J

Junwei Li

CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China

G

Guobao Zhong

College of Materials Science and Engineering Fuzhou University Fuzhou 350108 China; CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China

J

Jun Yuan

College of Materials Science and Engineering Fuzhou University Fuzhou 350108 China; CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China

S

Shun Lei

College of Materials Science and Engineering Fuzhou University Fuzhou 350108 China; CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China

H

Hongbing Zhan

College of Materials Science and Engineering Fuzhou University Fuzhou 350108 China

Funding

National Natural Science Foundation of China Award: 51872048

National Basic Research Program of China Award: 2017YFB0701700

Cite This Article

Xiang Hu, Junwei Li, Guobao Zhong, et al. (2020). Hierarchical Multicavity Nitrogen‐Doped Carbon Nanospheres as Efficient Polyselenide Reservoir for Fast and Long‐Life Sodium‐Selenium Batteries. Small, 16(48). https://doi.org/10.1002/smll.202005534

Hierarchical Multicavity Nitrogen‐Doped Carbon Nanospheres as Efficient Polyselenide Reservoir for Fast and Long‐Life Sodium‐Selenium Batteries

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