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Carbon skeleton confined Sb chalcogenides nanodots for stable sodium storage.

Authors :
Yang, Li
Liu, Minling
Xiang, Yinger
Deng, Wentao
Zou, Guoqiang
Hou, Hongshuai
Ji, Xiaobo
Source :
Carbon. Sep2022, Vol. 197, p341-349. 9p.
Publication Year :
2022

Abstract

Antimony-based materials represent promising anode materials for sodium ion batteries (SIBs) owing to their high theoretical capacity, however, the large volume expansion and low ionic conductivity during the electrochemical process prohibit them from reaching their theoretical expectations. In this work, Sb 2 S 3 @C and Sb 2 Se 3 @C nanodots with uniform diameters of 19.0 nm and 20.7 nm were synthesized by H 2 /C thermal reduction and co-sulfurization (selenization) of sodium stibogluconate. Each Sb 2 S 3 and Sb 2 Se 3 nanodot was coated by an interconnecting carbon network with weak graphitization, which further crosslinked together to form a high conductive framework. When applied as anode for SIBs, they exhibited desired sodium storage properties, especially the excellent cycling stability of Sb 2 Se 3 @C nanodots with a reversible capacity of 316.1 mA h g−1 after 100 cycles at 100 mA g−1 and 269.1 mA h g−1 after 200 cycles at 1 A g−1, which was consistent with the calculated result of theoretical volume changes (264% and 246%) and density functional theory (DFT) calculation for both materials during the Na+ intercalation processes, as expected. [Display omitted] • Sb 2 S 3 (Sb 2 S 3) nanodots/C composites have been successfully fabricated. • The volume changes of two materials during the Na+ insertion/deintercalation process have been calculated and analyzed in details. • The satisfactory sodium storage properties are achieved, which is consistent with the result of theoretical calculation. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00086223
Volume :
197
Database :
Academic Search Index
Journal :
Carbon
Publication Type :
Academic Journal
Accession number :
158403520
Full Text :
https://doi.org/10.1016/j.carbon.2022.06.043