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Title: Li/Ag2VO2PO4 batteries: the roles of composite electrode constituents on electrochemistry

Abstract

In this study, we utilize silver vanadium phosphorous oxide, Ag2VO2PO4, as a model system to systematically study the impact of the constituents of a composite electrode, including polymeric and conductive additives, on electrochemistry. Notably, although highly resistive, this bimetallic cathode can be discharged as a pure electroactive material in the absence of a conductive additive as it generates an in situ conductive matrix via a reduction displacement reaction resulting in the formation of silver metal nanoparticles. Also, three different electrode compositions were investigated: Ag2VO2PO4 only, Ag2VO2PO44 with binder, and Ag2VO2PO4 with binder and carbon. Constant current discharge, pulse testing and impedance spectroscopy measurements were used to characterize the electrochemical properties of the electrodes as a function of depth of discharge. In situ EDXRD was used to spatially resolve the discharge progression within the cathode by following the formation of Ag0. Ex situ XRD and EXAFS modeling were used to quantify the amount of Ag0 formed. Results indicate that the metal center reduced (V5+ or Ag+) was highly dependent on composite composition (presence of PTFE, carbon), depth of discharge (Ag0 nanoparticle formation), and spatial location within the cathode. The addition of a binder was found to increase cell polarization, and themore » percolation network provided by the carbon in the presence of PTFE was further increased with reduction and formation of Ag0. Lastly, this study provides insight into the factors controlling the electrochemistry of resistive active materials in composite electrodes.« less

Authors:
 [1];  [2];  [1];  [2];  [3];  [3];  [4]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Stony Brook Univ., NY (United States). Dept. of Chemistry
  3. Stony Brook Univ., NY (United States). Dept. of Chemistry and Department of Materials Science and Engineering
  4. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States). Dept. of Chemistry and Department of Materials Science and Engineering
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1347289
Report Number(s):
BNL-113549-2017-JA
Journal ID: ISSN 2046-2069; RSCACL
Grant/Contract Number:  
SC00112704; SC0012673; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
RSC Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 108; Journal ID: ISSN 2046-2069
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE; batteries; composite; electrode; electrochemistry

Citation Formats

Bock, David C., Bruck, Andrea M., Pelliccione, Christopher J., Zhang, Yiman, Takeuchi, Kenneth J., Marschilok, Amy C., and Takeuchi, Esther S. Li/Ag2VO2PO4 batteries: the roles of composite electrode constituents on electrochemistry. United States: N. p., 2016. Web. doi:10.1039/C6RA24024K.
Bock, David C., Bruck, Andrea M., Pelliccione, Christopher J., Zhang, Yiman, Takeuchi, Kenneth J., Marschilok, Amy C., & Takeuchi, Esther S. Li/Ag2VO2PO4 batteries: the roles of composite electrode constituents on electrochemistry. United States. doi:10.1039/C6RA24024K.
Bock, David C., Bruck, Andrea M., Pelliccione, Christopher J., Zhang, Yiman, Takeuchi, Kenneth J., Marschilok, Amy C., and Takeuchi, Esther S. Tue . "Li/Ag2VO2PO4 batteries: the roles of composite electrode constituents on electrochemistry". United States. doi:10.1039/C6RA24024K. https://www.osti.gov/servlets/purl/1347289.
@article{osti_1347289,
title = {Li/Ag2VO2PO4 batteries: the roles of composite electrode constituents on electrochemistry},
author = {Bock, David C. and Bruck, Andrea M. and Pelliccione, Christopher J. and Zhang, Yiman and Takeuchi, Kenneth J. and Marschilok, Amy C. and Takeuchi, Esther S.},
abstractNote = {In this study, we utilize silver vanadium phosphorous oxide, Ag2VO2PO4, as a model system to systematically study the impact of the constituents of a composite electrode, including polymeric and conductive additives, on electrochemistry. Notably, although highly resistive, this bimetallic cathode can be discharged as a pure electroactive material in the absence of a conductive additive as it generates an in situ conductive matrix via a reduction displacement reaction resulting in the formation of silver metal nanoparticles. Also, three different electrode compositions were investigated: Ag2VO2PO4 only, Ag2VO2PO44 with binder, and Ag2VO2PO4 with binder and carbon. Constant current discharge, pulse testing and impedance spectroscopy measurements were used to characterize the electrochemical properties of the electrodes as a function of depth of discharge. In situ EDXRD was used to spatially resolve the discharge progression within the cathode by following the formation of Ag0. Ex situ XRD and EXAFS modeling were used to quantify the amount of Ag0 formed. Results indicate that the metal center reduced (V5+ or Ag+) was highly dependent on composite composition (presence of PTFE, carbon), depth of discharge (Ag0 nanoparticle formation), and spatial location within the cathode. The addition of a binder was found to increase cell polarization, and the percolation network provided by the carbon in the presence of PTFE was further increased with reduction and formation of Ag0. Lastly, this study provides insight into the factors controlling the electrochemistry of resistive active materials in composite electrodes.},
doi = {10.1039/C6RA24024K},
journal = {RSC Advances},
number = 108,
volume = 6,
place = {United States},
year = {2016},
month = {11}
}

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