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Title: Three-Dimensionally Mesostructured Fe 2O 3 Electrodes with Good Rate Performance and Reduced Voltage Hysteresi

Abstract

Ni scaffolded mesostructured 3D Fe 2O 3 electrodes were fabricated by colloidal templating and pulsed elec-trodeposition. The scaffold provided short pathways for both lithium ions and electrons in the active phase, enabling fast kinetics and thus a high power density. The scaffold also resulted in a reduced voltage hysteresis. The electrode showed a reversible capacity of ~1000 mA h g -1 at 0.2 A g -1 (~0.2 C) for about 20 cycles, and at a current density of 20 A g -1 (~20 C) the deliverable capacity was about 450 mA h g -1. The room temperature voltage hysteresis at 0.1 A g -1 (~0.1 C) was 0.62 V, which is significantly smaller than that normally reported in the literature. And it could be further reduced to 0.42 V when cycling at 45 ºC. Potentiostatic electrochemical impedance spectroscopy (PEIS) studies indicated the small voltage hysteresis may be due to a reduction in the Li 2O/Fe interfacial area in the electrode during cycling relative to convention-al conversion systems.

Authors:
 [1];  [1];  [2];  [2]
  1. Univ. of Illinois, Urbana-Champaign, IL (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1265755
Grant/Contract Number:
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 27; Journal Issue: 8; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Wang, Junjie, Braun, Paul V., Zhou, Hui, and Nanda, Jagjit. Three-Dimensionally Mesostructured Fe2O3 Electrodes with Good Rate Performance and Reduced Voltage Hysteresi. United States: N. p., 2015. Web. doi:10.1021/cm504365s.
Wang, Junjie, Braun, Paul V., Zhou, Hui, & Nanda, Jagjit. Three-Dimensionally Mesostructured Fe2O3 Electrodes with Good Rate Performance and Reduced Voltage Hysteresi. United States. doi:10.1021/cm504365s.
Wang, Junjie, Braun, Paul V., Zhou, Hui, and Nanda, Jagjit. Thu . "Three-Dimensionally Mesostructured Fe2O3 Electrodes with Good Rate Performance and Reduced Voltage Hysteresi". United States. doi:10.1021/cm504365s. https://www.osti.gov/servlets/purl/1265755.
@article{osti_1265755,
title = {Three-Dimensionally Mesostructured Fe2O3 Electrodes with Good Rate Performance and Reduced Voltage Hysteresi},
author = {Wang, Junjie and Braun, Paul V. and Zhou, Hui and Nanda, Jagjit},
abstractNote = {Ni scaffolded mesostructured 3D Fe2O3 electrodes were fabricated by colloidal templating and pulsed elec-trodeposition. The scaffold provided short pathways for both lithium ions and electrons in the active phase, enabling fast kinetics and thus a high power density. The scaffold also resulted in a reduced voltage hysteresis. The electrode showed a reversible capacity of ~1000 mA h g-1 at 0.2 A g-1 (~0.2 C) for about 20 cycles, and at a current density of 20 A g-1 (~20 C) the deliverable capacity was about 450 mA h g-1. The room temperature voltage hysteresis at 0.1 A g-1 (~0.1 C) was 0.62 V, which is significantly smaller than that normally reported in the literature. And it could be further reduced to 0.42 V when cycling at 45 ºC. Potentiostatic electrochemical impedance spectroscopy (PEIS) studies indicated the small voltage hysteresis may be due to a reduction in the Li2O/Fe interfacial area in the electrode during cycling relative to convention-al conversion systems.},
doi = {10.1021/cm504365s},
journal = {Chemistry of Materials},
number = 8,
volume = 27,
place = {United States},
year = {Thu Mar 26 00:00:00 EDT 2015},
month = {Thu Mar 26 00:00:00 EDT 2015}
}

Journal Article:
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Cited by: 26 works
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