1 research outputs found
Wire-Shaped Supercapacitors with Organic Electrolytes Fabricated via Layer-by-Layer Assembly
A wire-shaped supercapacitor
(WSS) has structural advantages of
high flexibility and ease of incorporation into conventional textile
substrates. In this work, we report a thin reproducible WSS fabricated
via layer-by-layer (LbL) assembly of multiwalled carbon nanotubes
(MWCNTs), combined with an organic electrolyte of propylene carbonate
(PC)–acetonitrile (ACN)–lithium perchlorate (LiClO<sub>4</sub>)–polyÂ(methyl methacrylate) (PMMA) that extends the
voltage window to 1.6 V. The MWCNTs were uniformly deposited on a
curved surface of a thin Au wire using an LbL assembly technique,
resulting in linearly increased areal capacitance of the fabricated
WSS. Vanadium oxide was coated on the LbL-assembled MWCNT electrode
to induce pseudocapacitance, hence enhancing the overall capacitance
of the fabricated WSS. Both the cyclic stability of the WSS and the
viscosity of the electrolyte could be optimized by controlling the
mixing ratio of PC to ACN. As a result, the fabricated WSS exhibits
an areal capacitance of 5.23 mF cm<sup>–2</sup> at 0.2 mA cm<sup>–2</sup>, an energy density of 1.86 μ W h cm<sup>–2</sup>, and a power density of 8.5 mW cm<sup>–2</sup>, in addition
to a high cyclic stability with a 94% capacitance retention after
10 000 galvanostatic charge–discharge cycles. This work
demonstrates a great potential of the fabricated scalable WSS in the
application to high-performance textile electronics as an integrated
energy storage device