Premium
Heterostructure Engineering of Core‐Shelled Sb@Sb 2 O 3 Encapsulated in 3D N‐Doped Carbon Hollow‐Spheres for Superior Sodium/Potassium Storage
Author(s) -
Chen Bochao,
Yang Lizhuang,
Bai Xiangren,
Wu Qingzhao,
Liang Ming,
Wang Yuxuan,
Zhao Naiqin,
Shi Chunsheng,
Zhou Baozeng,
He Chunnian
Publication year - 2021
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202006824
Subject(s) - anode , materials science , heterojunction , chemical engineering , composite number , electrochemistry , carbon fibers , doping , annealing (glass) , battery (electricity) , electrode , nanotechnology , composite material , chemistry , optoelectronics , power (physics) , physics , quantum mechanics , engineering
In this work, the core‐shelled Sb@Sb 2 O 3 heterostructure encapsulated in 3D N‐doped carbon hollow‐spheres is fabricated by spray‐drying combined with heat treatment. The novel core‐shelled heterostructures of Sb@Sb 2 O 3 possess a mass of heterointerfaces, which formed spontaneously at the core‐shell contact via annealing oxidation and can promote the rapid Na + /K + transfer. The density functional theory calculations revealed the mechanism and significance of Na/K‐storage for the core‐shelled Sb@Sb 2 O 3 heterostructure, which validated that the coupling between the high‐conductivity of Sb and the stability of Sb 2 O 3 can relieve the shortcomings of the individual building blocks, thereby enhancing the Na/K‐storage capacity. Furthermore, the core‐shell structure embedded in the 3D carbon framework with robust structure can further increase the electrode mechanical strength and thus buffer the severe volume changes upon cycling. As a result, such composite architecture exhibited a high specific capacity of ≈573 mA h g −1 for sodium‐ion battery (SIB) anode and ≈474 mA h g −1 for potassium‐ion battery (PIB) anode at 100 mA g −1 , and superior rate performance (302 mA h g −1 at 30 A g −1 for SIB anode, while 239 mA h g −1 at 5 A g −1 for PIB anode).