Surface Stretching Enables Highly Disordered Graphitic Domains for Ultrahigh Rate Sodium Storage

Hard carbons (HCs) with high sloping capacity are considered as the leading candidate anode for sodium‐ion batteries (SIBs); nevertheless, achieving basically complete slope‐dominated behavior with high rate capability is still a big challenge. Herein, the synthesis of mesoporous carbon nanospheres...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2023-07, Vol.19 (28), p.e2301203-n/a
Main Authors: Liu, Yi, Wan, Yanhua, Zhang, Jun‐Ye, Zhang, Xingmiao, Hung, Chin‐Te, Lv, Zirui, Hua, Weiming, Wang, Yonggang, Chao, Dongliang, Li, Wei
Format: Article
Language:English
Subjects:
Anodes
Carbon
Graphitization
High temperature
mesoporous carbon
molybdenum carbide
Nanospheres
Nanotechnology
rate capacity
Sodium-ion batteries
Stretching
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Summary:Hard carbons (HCs) with high sloping capacity are considered as the leading candidate anode for sodium‐ion batteries (SIBs); nevertheless, achieving basically complete slope‐dominated behavior with high rate capability is still a big challenge. Herein, the synthesis of mesoporous carbon nanospheres with highly disordered graphitic domains and MoC nanodots modification via a surface stretching strategy is reported. The MoOx surface coordination layer inhibits the graphitization process at high temperature, thus creating short and wide graphite domains. Meanwhile, the in situ formed MoC nanodots can greatly promote the conductivity of highly disordered carbon. Consequently, MoC@MCNs exhibit an outstanding rate capacity (125 mAh g−1 at 50 A g−1). The “adsorption‐filling” mechanism combined with excellent kinetics is also studied based on the short‐range graphitic domains to reveal the enhanced slope‐dominated capacity. The insight in this work encourages the design of HC anodes with dominated slope capacity toward high‐performance SIBs. Mesoporous carbon nanospheres with highly disordered graphitic domains and MoC nanodots modification are developed via a surface stretching strategy. The MoOx surface coordination layer inhibits the graphitization process at high temperature, while the in situ formed MoC nanodots can greatly promote the conductivity of highly disordered carbon. Consequently, MoC@MCNs exhibit enhanced slope‐dominated capacity, as well as outstanding rate capability and cycle performance.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202301203