期刊
APPLIED SURFACE SCIENCE
卷 517, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.146222
关键词
Aramid nonwovens; Wearable electrochemical capacitors; Asymmetric; High energy density
类别
资金
- National Natural Science Foundation of China [51873135]
- Key Major Program of Natural Science Fundamental Research Project of Jiangsu Colleges and Universities [18KJA430013]
- Priority Academic Program Development of Jiangsu Higher Education Institution (PAPD), China
High-performance flexible asymmetric electrochemical capacitors (ANW-AECs) for high energy-density wearable devices have been developed through assembling unique aramid nonwovens (ANWs) with different surface structures, that is, ANWs chemically coated with Ag particles and polypyrrole (ANW/Ag/PPy) act as a positive electrode, while ANWs chemically coated with Ag particles and multi-walled carbon nanotubes (ANW/Ag/CNT) play as a negative electrode. The influences of different compositions of surface modified ANWs on structure and integrated performances of ANW-AECs were intensively studied and compared with those of symmetric electrochemical capacitors (ANW-SECs). The prepared ANW-AECs not only have high energy density, but also process good wearability and cyclability. Their areal, volumetric or gravimetric energy density reaches 2.55 x 10(-4) W h cm(-2), 3.27 x 10(-3) W h cm(-3) or 8.61 x 10(-3) W h g(-1) at a high operating voltage of 1.6 V; their capacitance is still as high as 95.0% or 95.9% when the electrochemical or bending cycle reaches 1000 or 500. These outstanding performances originate from asymmetric design of devices as well as unique chemical and space structures of electrodes, including interactions between different components, high electrical conductivity and specific surface area.
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