title: Ordered mesoporous α-Fe2O3 (hematite) thin-film electrodes for application in high rate rechargeable lithium batteries.
abstract: Herein is reported the synthesis of ordered mesoporous α-Fe(2)O(3) thin films produced through coassembly strategies using a poly(ethylene-co-butylene)-block-poly(ethylene oxide) diblock copolymer as the structure-directing agent and hydrated ferric nitrate as the molecular precursor. The sol-gel derived α-Fe(2)O(3) materials are highly crystalline after removal of the organic template and the nanoscale porosity can be retained up to annealing temperatures of 600 °C. While this paper focuses on the characterization of these materials using various state-of-the-art techniques, including grazing-incidence small-angle X-ray scattering, time-of-flight secondary ion mass spectrometry, X-ray photoelectron spectroscopy, and UV-vis and Raman spectroscopy, the electrochemical properties are also examined and it is demonstrated that mesoporous α-Fe(2)O(3) thin-film electrodes not only exhibit enhanced lithium-ion storage capabilities compared to bulk materials but also show excellent cycling stabilities by suppressing the irreversible phase transformations that are observed in microcrystalline α-Fe(2)O(3).
authors.affiliation: Institute of Physical Chemistry, Justus-Liebig-University Giessen, Heinrich-Buff Ring 58, Giessen 35392, Germany.
authors.forename: Kirstin
authors.initials: K
authors.lastname: Brezesinski
authors.forename: Jan
authors.initials: J
authors.lastname: Haetge
authors.forename: John
authors.initials: J
authors.lastname: Wang
authors.forename: Simone
authors.initials: S
authors.lastname: Mascotto
authors.forename: Christian
authors.initials: C
authors.lastname: Reitz
authors.forename: Alexander
authors.initials: A
authors.lastname: Rein
authors.forename: Sarah H
authors.initials: SH
authors.lastname: Tolbert
authors.forename: Jan
authors.initials: J
authors.lastname: Perlich
authors.forename: Bruce
authors.initials: B
authors.lastname: Dunn
authors.forename: Torsten
authors.initials: T
authors.lastname: Brezesinski
mesh_terms: D011211:Electric Power Supplies; D004563:Electrochemistry; D004566:Electrodes; D008094:Lithium / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology; D016062:Porosity
chemical_list: D008094:Lithium