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 typically a disordered bulk mixture of different materials, or simple coatings of one material onto another. We demonstrate here a new technique to create complex hierarchical electrodes made of multilayers of vertically 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, formed by up to 7 different layers, can be used with no further processing as an anode in Li-ion batteries, with a specific capacity of up to 1175 μA h cm−2 and a capacity retention of 84% after 1000 cycles. Our coating strategy gives improved cyclability and rate capacity compared to conventional bulk materials. Our production method is ideally suited to assemble an arbitrary number of organic–inorganic materials in an arbitrary number of layers.

A robust, modular approach to produce graphene–MOx multilayer foams as electrodes for Li-ion batteries / Zhen Yuan Xia, Meganne Christian, Catia Arbizzani, Vittorio Morandi, Massimo Gazzano, Vanesa Quintano, Alessandro Kovtun, Vincenzo Palermo. - In: NANOSCALE. - ISSN 2040-3372. - STAMPA. - 11:12(2019), pp. 5265-5273. [10.1039/c8nr09195a]

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

Catia Arbizzani;
2019

Abstract

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 typically a disordered bulk mixture of different materials, or simple coatings of one material onto another. We demonstrate here a new technique to create complex hierarchical electrodes made of multilayers of vertically 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, formed by up to 7 different layers, can be used with no further processing as an anode in Li-ion batteries, with a specific capacity of up to 1175 μA h cm−2 and a capacity retention of 84% after 1000 cycles. Our coating strategy gives improved cyclability and rate capacity compared to conventional bulk materials. Our production method is ideally suited to assemble an arbitrary number of organic–inorganic materials in an arbitrary number of layers.
2019
A robust, modular approach to produce graphene–MOx multilayer foams as electrodes for Li-ion batteries / Zhen Yuan Xia, Meganne Christian, Catia Arbizzani, Vittorio Morandi, Massimo Gazzano, Vanesa Quintano, Alessandro Kovtun, Vincenzo Palermo. - In: NANOSCALE. - ISSN 2040-3372. - STAMPA. - 11:12(2019), pp. 5265-5273. [10.1039/c8nr09195a]
Zhen Yuan Xia, Meganne Christian, Catia Arbizzani, Vittorio Morandi, Massimo Gazzano, Vanesa Quintano, Alessandro Kovtun, Vincenzo Palermo
File in questo prodotto:
File Dimensione Formato  
2019_Xia_Nanoscale.pdf

accesso aperto

Tipo: Versione (PDF) editoriale
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 2.1 MB
Formato Adobe PDF
2.1 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/686948
Citazioni
  • ???jsp.display-item.citation.pmc??? 1
  • Scopus 16
  • ???jsp.display-item.citation.isi??? 16
social impact