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Title: Improved Performance in FeF2 Conversion Cathodes through Use of a Conductive 3D Scaffold and Al2O3 ALD Coating

Abstract

FeF 2 is considered a promising conversion compound for the positive electrode in lithium‐ion batteries due to its high thermodynamic reduction potential (2.66 V vs Li/Li + ) and high theoretical specific capacity (571 mA h g −1 ). However, the sluggish reaction kinetics and rapid capacity decay caused by side reactions during cycling limit its practical application. Here, the fabrication of Ni‐supported 3D Al 2 O 3 ‐coated FeF 2 electrodes is presented, and it is shown that these structured electrodes significantly overcome these limitations. The electrodes are prepared by iron electrodeposition on a Ni support, followed by a facile fluorination process and Al 2 O 3 coating by atomic layer deposition. The 3D FeF 2 electrode delivers an initial discharge capacity of 380 mA h g −1 at a current density of 200 mA g −1 at room temperature. The 3D scaffold improves the reaction kinetics and enables a high specific capacity by providing an efficient electron pathway to the insulating FeF 2 and short Li diffusion lengths. The Al 2 O 3 coating significantly improves the cycle life, probably by preventing side reactions through limiting direct electrode–electrolyte contact. The fabrication method presented here can also be appliedmore » for synthesis of other metal fluoride materials on different 3D conductive templates.« less

Authors:
 [1];  [2];  [3];  [1];  [3];  [1]
+ Show Author Affiliations
  1. Univ. of Illinois at Urbana-Champaign, IL (United States). Frederick Seitz Materials Research Lab. Dept. of Materials Science and Engineering. Beckman Inst.
  2. Univ. of Illinois at Urbana-Champaign, IL (United States). Frederick Seitz Materials Research Lab. Dept. of Materials Science and Engineering. Beckman Inst.; Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Intelligent Machines
  3. Univ. of Illinois at Urbana-Champaign, IL (United States). Frederick Seitz Materials Research Lab. Dept. of Materials Science and Engineering
Publication Date:
Research Org.:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1533023
Alternate Identifier(s):
OSTI ID: 1392179
Grant/Contract Number:  
FG02-07ER46471; DE‐FG02‐07ER46471
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Functional Materials
Additional Journal Information:
Journal Volume: 27; Journal Issue: 35; Journal ID: ISSN 1616-301X
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; atomic layer deposition; bicontinuous cathodes; fluorination; Li-ion batteries; metal fluorides

Citation Formats

Kim, Sanghyeon, Liu, Jinyun, Sun, Ke, Wang, Junjie, Dillon, Shen J., and Braun, Paul V. Improved Performance in FeF2 Conversion Cathodes through Use of a Conductive 3D Scaffold and Al2O3 ALD Coating. United States: N. p., 2017. Web. doi:10.1002/adfm.201702783.
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Kim, Sanghyeon, Liu, Jinyun, Sun, Ke, Wang, Junjie, Dillon, Shen J., & Braun, Paul V. Improved Performance in FeF2 Conversion Cathodes through Use of a Conductive 3D Scaffold and Al2O3 ALD Coating. United States. https://doi.org/10.1002/adfm.201702783
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Kim, Sanghyeon, Liu, Jinyun, Sun, Ke, Wang, Junjie, Dillon, Shen J., and Braun, Paul V. Mon . "Improved Performance in FeF2 Conversion Cathodes through Use of a Conductive 3D Scaffold and Al2O3 ALD Coating". United States. https://doi.org/10.1002/adfm.201702783. https://www.osti.gov/servlets/purl/1533023.
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@article{osti_1533023,
title = {Improved Performance in FeF2 Conversion Cathodes through Use of a Conductive 3D Scaffold and Al2O3 ALD Coating},
author = {Kim, Sanghyeon and Liu, Jinyun and Sun, Ke and Wang, Junjie and Dillon, Shen J. and Braun, Paul V.},
abstractNote = {FeF 2 is considered a promising conversion compound for the positive electrode in lithium‐ion batteries due to its high thermodynamic reduction potential (2.66 V vs Li/Li + ) and high theoretical specific capacity (571 mA h g −1 ). However, the sluggish reaction kinetics and rapid capacity decay caused by side reactions during cycling limit its practical application. Here, the fabrication of Ni‐supported 3D Al 2 O 3 ‐coated FeF 2 electrodes is presented, and it is shown that these structured electrodes significantly overcome these limitations. The electrodes are prepared by iron electrodeposition on a Ni support, followed by a facile fluorination process and Al 2 O 3 coating by atomic layer deposition. The 3D FeF 2 electrode delivers an initial discharge capacity of 380 mA h g −1 at a current density of 200 mA g −1 at room temperature. The 3D scaffold improves the reaction kinetics and enables a high specific capacity by providing an efficient electron pathway to the insulating FeF 2 and short Li diffusion lengths. The Al 2 O 3 coating significantly improves the cycle life, probably by preventing side reactions through limiting direct electrode–electrolyte contact. The fabrication method presented here can also be applied for synthesis of other metal fluoride materials on different 3D conductive templates.},
doi = {10.1002/adfm.201702783},
journal = {Advanced Functional Materials},
number = 35,
volume = 27,
place = {United States},
year = {Mon Jul 24 00:00:00 EDT 2017},
month = {Mon Jul 24 00:00:00 EDT 2017}
}
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https://doi.org/10.1002/adfm.201702783
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