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Michalak B, Sommer H, Mannes D, et al. Gas Evolution in Operating Lithium-Ion Batteries Studied In Situ by Neutron Imaging. Sci Rep. 2015;5:15627doi: 10.1038/srep15627.
Michalak, B., Sommer, H., Mannes, D., Kaestner, A., Brezesinski, T., & Janek, J. (2015). Gas Evolution in Operating Lithium-Ion Batteries Studied In Situ by Neutron Imaging. Scientific reports, 515627. https://doi.org/10.1038/srep15627
Michalak, Barbara, et al. "Gas Evolution in Operating Lithium-Ion Batteries Studied In Situ by Neutron Imaging." Scientific reports vol. 5 (2015): 15627. doi: https://doi.org/10.1038/srep15627
Michalak B, Sommer H, Mannes D, Kaestner A, Brezesinski T, Janek J. Gas Evolution in Operating Lithium-Ion Batteries Studied In Situ by Neutron Imaging. Sci Rep. 2015 Oct 26;5:15627. doi: 10.1038/srep15627. PMID: 26496823; PMCID: PMC4620486.
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Sci Rep. 2015 Oct 26;5:15627. doi: 10.1038/srep15627.

Gas Evolution in Operating Lithium-Ion Batteries Studied In Situ by Neutron Imaging.

Scientific reports

Barbara Michalak, Heino Sommer, David Mannes, Anders Kaestner, Torsten Brezesinski, Jürgen Janek

Affiliations

  1. Battery and Electrochemistry Laboratory, Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
  2. BASF SE, 67056 Ludwigshafen, Germany.
  3. Paul Scherrer Institute, 5232 Villigen, Switzerland.
  4. Institute of Physical Chemistry, Justus-Liebig-University Giessen, Heinrich-Buff-Ring 58, 35392 Giessen, Germany.

PMID: 26496823 PMCID: PMC4620486 DOI: 10.1038/srep15627

Abstract

Gas generation as a result of electrolyte decomposition is one of the major issues of high-performance rechargeable batteries. Here, we report the direct observation of gassing in operating lithium-ion batteries using neutron imaging. This technique can be used to obtain qualitative as well as quantitative information by applying a new analysis approach. Special emphasis is placed on high voltage LiNi0.5Mn1.5O4/graphite pouch cells. Continuous gassing due to oxidation and reduction of electrolyte solvents is observed. To separate gas evolution reactions occurring on the anode from those associated with the cathode interface and to gain more insight into the gassing behavior of LiNi0.5Mn1.5O4/graphite cells, neutron experiments were also conducted systematically on other cathode/anode combinations, including LiFePO4/graphite, LiNi0.5Mn1.5O4/Li4Ti5O12 and LiFePO4/Li4Ti5O12. In addition, the data were supported by gas pressure measurements. The results suggest that metal dissolution in the electrolyte and decomposition products resulting from the high potentials adversely affect the gas generation, particularly in the first charge cycle (i.e., during graphite solid-electrolyte interface layer formation).

References

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