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

Journal Article · · Advanced Functional Materials
 [1];  [2];  [3];  [1];  [3];  [1]
  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
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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.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-07ER46471; DE‐FG02‐07ER46471
OSTI ID:
1533023
Alternate ID(s):
OSTI ID: 1392179
Journal Information:
Advanced Functional Materials, Vol. 27, Issue 35; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 42 works
Citation information provided by
Web of Science

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Cited By (11)

High Volumetric and Gravimetric Capacity Electrodeposited Mesostructured Sb 2 O 3 Sodium Ion Battery Anodes journal April 2019
Electrode Engineering by Atomic Layer Deposition for Sodium‐Ion Batteries: From Traditional to Advanced Batteries journal December 2019
Hydrothermal synthesis of K3FeF6 and its electrochemical characterization as cathode material for lithium-ion batteries journal July 2019
Reversible Conversion Reactions and Small First Cycle Irreversible Capacity Loss in Metal Sulfide‐Based Electrodes Enabled by Solid Electrolytes journal April 2019
Room-temperature liquid-phase synthesis of Na 3 FeF 6 and its lithium/sodium storage properties journal May 2019
Li-Rich Li[Li 1/6 Fe 1/6 Ni 1/6 Mn 1/2 ]O 2 (LFNMO) Cathodes: Atomic Scale Insight on the Mechanisms of Cycling Decay and of the Improvement due to Cobalt Phosphate Surface Modification journal September 2018
Insights into the Effects of Electrolyte Composition on the Performance and Stability of FeF 2 Conversion‐Type Cathodes journal March 2019
Template-Directed Solidification of Eutectic Optical Materials journal March 2018
Cycle stability of conversion-type iron fluoride lithium battery cathode at elevated temperatures in polymer electrolyte composites journal September 2019
Advanced Thin Film Cathodes for Lithium Ion Batteries journal February 2020
Electrochemically driven conversion reaction in fluoride electrodes for energy storage devices journal April 2018

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Related Subjects

25 ENERGY STORAGE
atomic layer deposition
bicontinuous cathodes
fluorination
Li-ion batteries
metal fluorides