期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 622, 期 -, 页码 840-848出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.04.171
关键词
Transition metal selenides; FeSe2@NC; Nitrogen-doped; Sodium-ion storage
资金
- National Natural Science Founda-tion of China [NSFC 21671005]
- Anhui Provincial Natural Science Foundation for Distinguished Youth [1808085J27]
- Science and Technology Major Project of Anhui Province [18030901093]
- Recruitment Program for Leading Talent Team of Anhui Province [GXXT-2020-073, GXXT-2021-021]
- University Synergy Innovation Program of Anhui Province
This study designs an anode material consisting of a FeSe2 core and a nitrogen-doped carbon shell, which exhibits superior rate capability and long cycling performance. The material also alleviates volume variation during electrode cycling.
Transition metal selenides (TMSs) have drawn substantial attention as promising anode materials for sodium-ion batteries (SIBs) on account of their rapid reaction kinetics and high reversible capacity. However, the undesirable capacity decay and inferior rate performance still hamper their large-scale application. Herein, an anode material comprising combination of olivary nanostructure FeSe2 core and nitrogen-doped carbon shell (designated as FeSe2@NC) is well designed by in-situ polymerization and selenization method. The well-designed nitrogen-doped carbon shell can not only alleviate the volume variation during the electrode cycling but also provide an optimized ion/electron transport pathway. The resulting FeSe2@NC electrodes exhibit a superior rate capability of 228.4 mA h g(-1) at 10 A g(-1) and a long cycling performance of 246.5 mA h g(-1) at 5 A g(-1) after 1000 cycles, which can be assigned to the enhanced structural integrity and improved electrical conductivity. The strategy would present a promising thought for structure design of TMSs as anode materials, which could enhance high-rate and long-lasting cycle performances for SIBs. (C) 2022 Elsevier Inc. All rights reserved.
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