A robust, modular approach to produce graphene–MOx multilayer foams as electrodes for Li-ion batteries

Xia, Zhenyuan and Christian, Meganne and Arbzzani, Catia and Morandi, Vittorio and Gazzano, M. and Quintano, Vanesa and Kovtun, Alessandro and Palermo, Vincenzo (2019) A robust, modular approach to produce graphene–MOx multilayer foams as electrodes for Li-ion batteries. Nanoscale (11). pp. 5265-5273. ISSN 2040-3372

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Major breakthroughs in batteries would require the development of new composite electrode materials,with a precisely controlled nanoscale architecture. However, composites used for energy storage are typi-cally a disordered bulk mixture of different materials, or simple coatings of one material onto another. Wedemonstrate here a new technique to create complex hierarchical electrodes made of multilayers of verti-cally aligned nanowalls of hematite (Fe2O3) alternated with horizontal spacers of reduced graphene oxide(RGO), all deposited on a 3D, conductive graphene foam. The RGO nanosheets act as porous spacers,current collectors and protection against delamination of the hematite. The multilayer composite, formedby up to 7 different layers, can be used with no further processing as an anode in Li-ion batteries, with aspecific capacity of up to 1175μAhcm−2and a capacity retention of 84% after 1000 cycles. Our coatingstrategy gives improved cyclability and rate capacity compared to conventional bulk materials. Our pro-duction method is ideally suited to assemble an arbitrary number of organic–inorganic materials in anarbitrary number of layers.

Item Type: Article
Subjects: 500 Scienze naturali e Matematica
Depositing User: Vincenzo Palermo
Date Deposited: 17 Apr 2019 10:58
Last Modified: 17 Apr 2019 11:00
URI: http://eprints.bice.rm.cnr.it/id/eprint/18904

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