Issue 35, 2014

Polyaniline nanofiber/vanadium pentoxide sprayed layer-by-layer electrodes for energy storage

Abstract

Layer-by-layer assembly, as a low-cost process to create high-performance coatings, has been widely studied over the past 20 years. However, conventional layer-by-layer assembly is not well suited to large-area, large-scale and rapid application because of the long time scale required to complete a multilayer coating. Here, we develop a simple, water-based, rapid spray-on method to produce and prepare polyaniline/vanadium pentoxide layer-by-layer thin film cathodes for Li-ion batteries. This method uses spray-assisted LbL assembly, which is suitable to coating over large areas rapidly. The result is a water-processable hybrid cathode with high capacity (up to 232 mA h g−1 at a discharge current of 5 μA cm−2), specific energy (up to 650 mW h g−1 at a discharge current of 0.5 μA cm−2), specific power (up to 3395 mW g−1 at a discharge current of 25 μA cm−2), and good cycle life. The performance is dependent on thickness and discharge rate. Compared to the traditional polyaniline/vanadium pentoxide prepared by dipping at a rate of 0.0373 nm s−1, sprayed electrodes grow at a significantly high rate of 0.42 nm s−1 – 11 times faster. This approach demonstrates the rapid layer-by-layer assembly of Li-ion battery electrodes without sacrificing performance.

Graphical abstract: Polyaniline nanofiber/vanadium pentoxide sprayed layer-by-layer electrodes for energy storage

Supplementary files

Article information

Article type
Paper
Submitted
09 Jun 2014
Accepted
10 Jul 2014
First published
10 Jul 2014

J. Mater. Chem. A, 2014,2, 14421-14428

Author version available

Polyaniline nanofiber/vanadium pentoxide sprayed layer-by-layer electrodes for energy storage

L. Shao, J. Jeon and J. L. Lutkenhaus, J. Mater. Chem. A, 2014, 2, 14421 DOI: 10.1039/C4TA02911A

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