Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 19, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201800054
Keywords
carbon fibers; flexible; NiS2; sodium batteries; yolk-shell
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Funding
- National Natural Science Foundation of China [51572129, 51602158, 51674147]
- International S&T Cooperation Program of China [2016YFE0111500]
- Natural Science Foundation of Jiangsu Province [BK20160835, BK20170036, BK20161544]
- Natural Science Foundation of the Jiangsu Higher Education Institutions [16KJA430001]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Fiber-shaped rechargeable batteries hold promise as the next-generation energy storage devices for wearable electronics. However, their application is severely hindered by the difficulty in fabrication of robust fiber-like electrodes with promising electrochemical performance. Herein, yolk-shell NiS2 nanoparticles embedded in porous carbon fibers (NiS2 subset of PCF) are successfully fabricated and developed as high-performance fiber electrodes for sodium storage. Benefiting from the robust embedded structure, 3D porous and conductive carbon network, and yolk-shell NiS2 nanoparticles, the as-prepared NiS2 subset of PCF fiber electrode achieves a high reversible capacity of about 679 mA h g(-1) at 0.1 C, outstanding rate capability (245 mA h g(-1) at 10 C), and ultrastable cycle performance with 76% capacity retention over 5000 cycles at 5 C. Notably, a flexible fiber-shaped sodium battery is assembled, and high reversible capacity is kept at different bending states. This work offers a new electrode-design paradigm toward novel carbon fiber electrodes embedded with transition metal oxides/sulfides/phosphides for application in flexible energy storage devices.
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