期刊
ACS NANO
卷 14, 期 12, 页码 17683-17692出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c08818
关键词
sodium ion batteries; anode materials; ultralong cycle life; microrods; hollow structure
类别
资金
- National Natural Science Foundation of China [51774100, 51902108]
- Basic Ability Improvement Program for Young and Middle-Age Teachers of High School in Guangxi [2020KY02034]
- Guangxi Technology Base and Talent Subject [GUIKE AD20159015, 18126001]
- Guangxi Innovation Driven Development Subject [GUIKE AA19182020, GUIKE AA19254004]
- Special Fund for Guangxi Distinguished Expert
Transition-metal selenides have emerged as promising anode materials for sodium ion batteries (SIBs). Nevertheless, they suffer from volume expansion, polyselenide dissolution, and sluggish kinetics, which lead to inadequate conversion reaction toward sodium and poor reversibility during the desodiation process. Therefore, the transition-metal selenides are far from long cycling stability, outstanding rate performance, and high initial Coulombic efficiency, which are the major challenges for practical application in SIBs. Here, an efficient anode material including an FeSe2 core and N-doped carbon shell with inner void space as well as high conductivity is developed for outstanding rate performance and long cycle life SIBs. In the ingeniously designed FeSe2@NC microrods, the N-doped carbon shell can facilitate mass transport/electron transfer, protect the FeSe2 core from the electrolyte, and accommodate volume variation of FeSe2 with the help of the inner void of the core. Thus, the FeSe2@NC microrods can maintain strong structural integrity upon long cycling and ensure a good reversible conversion reaction of FeSe2 during the discharge/charge process. As a result, the as-prepared FeSe2@NC microrods exhibit excellent sodium storage performance and ultrahigh stability, achieving an excellent rate capability (411 mAh g(-1) at 10.0 A g(-1)) and a long-term cycle performance (401.3 mAh g(-1) after 2000 cycles at 5.0 A g(-1)).
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