Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201910043
Keywords
electrochemical performance; flexible electrodes; hematite; nanorod arrays; sodium-ion batteries
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Funding
- National Natural Science Foundation of China [51872192, 51672182, 51772197]
- Thousand Young Talents Plan
- Jiangsu Natural Science Foundation [BK20180002]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [19KJA170001, 17KJA430013]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
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Rechargeable batteries with flexibility can find tremendous applications in wearable and bendable electronics. One central mission for the advancement of such high-performance batteries is the exploration of flexible anodes with electrochemical and mechanical robustness. Herein reported is a robust and flexible sodium-ion anode based on self-supported hematite nanoarray grown on carbon cloth. The ammonia treatment that results in dual doping of both nitrogen and low-valent iron renders surface reactivity and electric conductivity to the material. The dual-doped hematite arrays afford a robust activity for sodium storage, exhibiting reversible capacities of 895 and 382 mAh g(-1) at current rates of 0.1 and 5 A g(-1), respectively, or 615 and 356 mAh g(-1) by removing the contribution of the substrate. They also sustain 85% of the initial capacity upon 200 cycles at 0.2 A g(-1). To demonstrate the flexibility, full cells composed of a hematite array anode and Na3V2(PO4)(3)/C cathode are assembled. The cell is capable of affording an energy density of 201 Wh kg(-1) and sustaining repeated bending without performance decay, demonstrating a significant potential in practical application.
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