期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 11, 页码 12801-12808出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b22128
关键词
aqueous rechargeable batteries; Ni-Fe batteries; metal phosphide; fiber-shaped devices; wearable electronics
资金
- Singapore Ministry of Education Academic Research Fund Tier 2 [MOE2015-T2-2010]
- Singapore Ministry of Education Academic Research Fund Tier 1 [MOE2019-T1-001-103, MOE2019-T1-001111]
- Nanyang Technological University
- EEE Ignition Research Grant
Aqueous secondary Ni-Fe batteries with superior energy density, cost-effectiveness, and outstanding safety contribute significantly toward the development of portable and wearable energy storage devices with high performance. However, the common electrode materials are nickel/iron or their oxides which have suffered from poor conductivity and cycle performance. As an ideal candidate to address these issues, metal phosphides may offer outstanding theoretical specific capacity, low conversion potential, and impressive redox. In this study, one novel type of high-performance flexible Ni-Fe battery with binder-free electrodes on conductive fiber substrates is successfully designed and fabricated. Carbon nanotube fibers with the direct grown hierarchical NiCoP nanosheet arrays and FeP nanowire arrays are fabricated first using hydrothermal synthesis and then the pursuant gas phosphating process. With the assistance of the PVA-KOH gel electrolyte, our fiber-shaped aqueous rechargeable battery (FARB) presents negligible capacity loss after bending 3000 times. Meanwhile, the assembled FARB has a significant capacity of 0.294 mA h/cm(2) under the current density of 2 mA/cm(2) and a high energy density of 235.6 mu W h/cm(2).
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