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Title: Na intercalation in Fe-MIL-100 for aqueous Na-ion batteries

Here we report for the first time the feasibility of using metal–organic frameworks (MOFs) as electrodes for aqueous Na-ion batteries. We show that Fe-MIL-100, a known redox-active MOF, is electrochemically active in a Na aqueous electrolyte, under various compositions. Emphasis was placed on investigating the electrode–electrolyte interface, with a focus on identifying the relationship between additives in the composition of the working electrode, particle size and overall performance. We found that the energy storage capacity is primarily dependent on the binder additive in the composite; the best activity for this MOF is obtained with Nafion as a binder, owing to its hydrophilic and ion conducting nature. Kynar-bound electrodes are clearly less effective, due to their hydrophobic character, which impedes wetting of the electrode. The binder-free systems show the poorest electrochemical activity. There is little difference in the overall performance as function of particle size (micro vs. nano), implying the storage capacities in this study are not limited by ionic and/or electronic conductivity. Excellent reversibility and high coulombic efficiency are achieved at higher potential ranges, observed after cycle 20. That is despite progressive capacity decay observed in the initial cycles. Importantly, structural analyses of cycled working electrodes confirm that the longmore » range crystallinity remains mainly unaltered with cycling. These findings suggest that limited reversibility of the intercalated Na ions in the lower potential range, together with the gradual lack of available active sites in subsequent cycles is responsible for the rapid decay in capacity retention.« less
Authors:
 [1] ;  [1] ; ORCiD logo [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Nanoscale Sciences Dept.
Publication Date:
Report Number(s):
SAND2017-11694J
Journal ID: ISSN 2046-2069; 658244
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
RSC Advances
Additional Journal Information:
Journal Volume: 7; Journal Issue: 39; Journal ID: ISSN 2046-2069
Publisher:
Royal Society of Chemistry
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); SNL Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 77 NANOSCIENCE AND NANOTECHNOLOGY
OSTI Identifier:
1421628

Chavez, James S., Harrison, Katharine L., and Sava Gallis, Dorina F.. Na intercalation in Fe-MIL-100 for aqueous Na-ion batteries. United States: N. p., Web. doi:10.1039/c7ra01629h.
Chavez, James S., Harrison, Katharine L., & Sava Gallis, Dorina F.. Na intercalation in Fe-MIL-100 for aqueous Na-ion batteries. United States. doi:10.1039/c7ra01629h.
Chavez, James S., Harrison, Katharine L., and Sava Gallis, Dorina F.. 2017. "Na intercalation in Fe-MIL-100 for aqueous Na-ion batteries". United States. doi:10.1039/c7ra01629h. https://www.osti.gov/servlets/purl/1421628.
@article{osti_1421628,
title = {Na intercalation in Fe-MIL-100 for aqueous Na-ion batteries},
author = {Chavez, James S. and Harrison, Katharine L. and Sava Gallis, Dorina F.},
abstractNote = {Here we report for the first time the feasibility of using metal–organic frameworks (MOFs) as electrodes for aqueous Na-ion batteries. We show that Fe-MIL-100, a known redox-active MOF, is electrochemically active in a Na aqueous electrolyte, under various compositions. Emphasis was placed on investigating the electrode–electrolyte interface, with a focus on identifying the relationship between additives in the composition of the working electrode, particle size and overall performance. We found that the energy storage capacity is primarily dependent on the binder additive in the composite; the best activity for this MOF is obtained with Nafion as a binder, owing to its hydrophilic and ion conducting nature. Kynar-bound electrodes are clearly less effective, due to their hydrophobic character, which impedes wetting of the electrode. The binder-free systems show the poorest electrochemical activity. There is little difference in the overall performance as function of particle size (micro vs. nano), implying the storage capacities in this study are not limited by ionic and/or electronic conductivity. Excellent reversibility and high coulombic efficiency are achieved at higher potential ranges, observed after cycle 20. That is despite progressive capacity decay observed in the initial cycles. Importantly, structural analyses of cycled working electrodes confirm that the long range crystallinity remains mainly unaltered with cycling. These findings suggest that limited reversibility of the intercalated Na ions in the lower potential range, together with the gradual lack of available active sites in subsequent cycles is responsible for the rapid decay in capacity retention.},
doi = {10.1039/c7ra01629h},
journal = {RSC Advances},
number = 39,
volume = 7,
place = {United States},
year = {2017},
month = {5}
}

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