期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 18, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202112776
关键词
alloy reactions; carbon confinement; full cells; metal chalcogenides; nanodot-in-nanofiber structures; sodium-ion batteries
类别
资金
- Basic and Applied Basic Research Fund Project of Guangdong Province [2020A1515110401]
- National Natural Science Foundation of China [51920105004, 52102223, 52102285]
- Guangzhou Key Laboratory of Low Dimensional Materials and Energy Storage Devices [20195010002]
A hierarchical nanodot-in-nanofiber structure is proposed to address the volume expansion/contraction issue in antimony-based materials for sodium storage. This structure reduces the size of active particles, mitigates the intrinsic volume change, and forms a stable transport network for charge carriers, leading to outstanding performance in sodium storage.
Antimony-based materials possess high specific capacity and appropriate redox potential for sodium storage, but they suffer from huge volume expansion/contraction when sodium ions insert/extract, which leads to inferior cycle life. Herein, a hierarchical nanodot-in-nanofiber structure is proposed to address this challenge, in which antimony selenide (Sb2Se3) nanocrystallites are confined by both 0D and 1D carbon layers. The multi-pronged nanostructure reduces the size of active particles, alleviates the intrinsic volume change of Sb2Se3, and forms a stable transport network for charge carriers. Finally, the nanodot-in-nanofiber structured Sb2Se3 anode exhibits outstanding performance for sodium storage, such as high capacity and exceptional cycle lifespan for over 10 000 cycles at 2.0 A g(-1). Therefore, this work can be valuable for the rational design of ultra-stable alloy and conversion-type materials in the application of next-generation batteries.
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