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Issue 27, 2018
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Spray printing of self-assembled porous structures for high power battery electrodes

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Abstract

A novel, generic methodology to manufacture hierarchically porous electrode structures directly onto current collectors has been developed based on layer-by-layer spray printing, here exemplified using TiO2(B) nanotubes for lithium-ion batteries. By optimizing and then exploiting the bi-solvent drying behavior of the spray printed ink to trigger self-assembly of the active TiO2(B) into a coral-like structure, controlled through-thickness pore channels were created, which were shown to promote lithium-ion mobility throughout the electrode. Using these optimized structures, the electrode thickness-dependent performance of TiO2(B) electrodes at high charge/discharge rates was compared with conventional slurry cast electrodes and revealed the superiority of the self-assembled electrodes, especially at the highest discharge rates. We also show this self-assembly effect in other active materials and over large areas, suggesting the potential for wide use of this approach for electrodes where fast dynamic response is prioritized.

Graphical abstract: Spray printing of self-assembled porous structures for high power battery electrodes

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Publication details

The article was received on 29 Mar 2018, accepted on 13 Jun 2018 and first published on 13 Jun 2018


Article type: Paper
DOI: 10.1039/C8TA02920B
Citation: J. Mater. Chem. A, 2018,6, 13133-13141
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    Spray printing of self-assembled porous structures for high power battery electrodes

    S. H. Lee, A. Mahadevegowda, C. Huang, J. D. Evans and P. S. Grant, J. Mater. Chem. A, 2018, 6, 13133
    DOI: 10.1039/C8TA02920B

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