Poly(vinylidene fluoride) (PVDF) Binder Degradation in Li–O2 Batteries: A Consideration for the Characterization of Lithium Superoxide
Abstract
We show that a common Li-O2 battery cathode binder, poly(vinylidene fluoride) (PVDF), degrades in the presence of reduced oxygen species during Li-O2 discharge when adventitious impurities are present. This degradation process forms products that exhibit Raman shifts (~1133 and 1525 cm-1) nearly identical to those reported to belong to lithium superoxide (LiO2), complicating the identification of LiO2in Li-O2 batteries. We show that these peaks are not observed when characterizing extracted discharged cathodes that employ poly(tetrafluoroethylene) (PTFE) as a binder, even when used to bind iridium-decorated reduced graphene oxide (Ir-rGO)-based cathodes similar to those that reportedly stabilize bulk LiO2 formation. We confirm that for all extracted discharged cathodes on which the 1133 and 1525 cm-1 Raman shifts are observed, only a 2.0 e-/O2process is identified during the discharge, and lithium peroxide (Li2O2) is predominantly formed (along with typical parasitic side product formation). Our results strongly suggest that bulk, stable LiO2formation via the 1 e-/O2process is not an active discharge reaction in Li-O2 batteries.
- Authors:
-
- Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Storage and Distributed Resources Division
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
- Stanford Univ., Stanford, CA (United States). SUNCAT Center for Interface Science and Catalysis and Dept. of Chemical Engineering; SLAC National Accelerator Lab., Menlo Park, CA (United States)
- IBM Almaden Research Center, San Jose, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
- OSTI Identifier:
- 1360209
- Alternate Identifier(s):
- OSTI ID: 1458486
- Grant/Contract Number:
- AC02-76SF00515; AC02-05CH11231; DGE-1106400; NNX16AM56H; CBET-1604927
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry Letters
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 6; Journal ID: ISSN 1948-7185
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE
Citation Formats
Papp, Joseph K., Forster, Jason D., Burke, Colin M., Kim, Hyo Won, Luntz, Alan C., Shelby, Robert M., Urban, Jeffrey J., and McCloskey, Bryan D. Poly(vinylidene fluoride) (PVDF) Binder Degradation in Li–O2 Batteries: A Consideration for the Characterization of Lithium Superoxide. United States: N. p., 2017.
Web. doi:10.1021/acs.jpclett.7b00040.
Papp, Joseph K., Forster, Jason D., Burke, Colin M., Kim, Hyo Won, Luntz, Alan C., Shelby, Robert M., Urban, Jeffrey J., & McCloskey, Bryan D. Poly(vinylidene fluoride) (PVDF) Binder Degradation in Li–O2 Batteries: A Consideration for the Characterization of Lithium Superoxide. United States. https://doi.org/10.1021/acs.jpclett.7b00040
Papp, Joseph K., Forster, Jason D., Burke, Colin M., Kim, Hyo Won, Luntz, Alan C., Shelby, Robert M., Urban, Jeffrey J., and McCloskey, Bryan D. Mon .
"Poly(vinylidene fluoride) (PVDF) Binder Degradation in Li–O2 Batteries: A Consideration for the Characterization of Lithium Superoxide". United States. https://doi.org/10.1021/acs.jpclett.7b00040. https://www.osti.gov/servlets/purl/1360209.
@article{osti_1360209,
title = {Poly(vinylidene fluoride) (PVDF) Binder Degradation in Li–O2 Batteries: A Consideration for the Characterization of Lithium Superoxide},
author = {Papp, Joseph K. and Forster, Jason D. and Burke, Colin M. and Kim, Hyo Won and Luntz, Alan C. and Shelby, Robert M. and Urban, Jeffrey J. and McCloskey, Bryan D.},
abstractNote = {We show that a common Li-O2 battery cathode binder, poly(vinylidene fluoride) (PVDF), degrades in the presence of reduced oxygen species during Li-O2 discharge when adventitious impurities are present. This degradation process forms products that exhibit Raman shifts (~1133 and 1525 cm-1) nearly identical to those reported to belong to lithium superoxide (LiO2), complicating the identification of LiO2in Li-O2 batteries. We show that these peaks are not observed when characterizing extracted discharged cathodes that employ poly(tetrafluoroethylene) (PTFE) as a binder, even when used to bind iridium-decorated reduced graphene oxide (Ir-rGO)-based cathodes similar to those that reportedly stabilize bulk LiO2 formation. We confirm that for all extracted discharged cathodes on which the 1133 and 1525 cm-1 Raman shifts are observed, only a 2.0 e-/O2process is identified during the discharge, and lithium peroxide (Li2O2) is predominantly formed (along with typical parasitic side product formation). Our results strongly suggest that bulk, stable LiO2formation via the 1 e-/O2process is not an active discharge reaction in Li-O2 batteries.},
doi = {10.1021/acs.jpclett.7b00040},
journal = {Journal of Physical Chemistry Letters},
number = 6,
volume = 8,
place = {United States},
year = {Mon Feb 27 00:00:00 EST 2017},
month = {Mon Feb 27 00:00:00 EST 2017}
}
Web of Science
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