Transformation and migration in secondary zinc-air batteries studied by in situ synchrotron X-ray diffraction and X-ray tomography

Mathias K. Christensen, Jette Katja Mathiesen, Søren Bredmose Simonsen, Poul Norby*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

There are numerous challenges associated with developing secondary Zn-air batteries regarding e.g. power density and cycle life. Some of the challenges are related to morphological changes in the anode during cycling due to combined electrochemical and chemical processes involved in the reversible Zn – ZnO transformation. We present a unique in situ synchrotron X-ray diffraction study, where a combination of time and spatial resolution allows information about transformation and transport in a Zn/ZnO anode during discharge/charge operation. By tracking Zn and ZnO reflections during cycling of two Zn-air batteries we see that the conversion of these phases is accompanied by transport into the anode and the anode configuration does not return to its initial state after recharge due to ZnO migration to other parts of the battery. During charge Zn metal is deposited as microcrystalline material, changing the morphology and phase distribution in the anode. The XRD results were supported by qualitative in situ X-ray computed tomography that confirms depletion of ZnO and non-homogeneous distribution of Zn.
Original languageEnglish
JournalJournal of Materials Chemistry A
Volume7
Issue number11
Pages (from-to)6459-6466
ISSN2050-7488
DOIs
Publication statusPublished - 1 Jan 2019

Cite this

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title = "Transformation and migration in secondary zinc-air batteries studied by in situ synchrotron X-ray diffraction and X-ray tomography",
abstract = "There are numerous challenges associated with developing secondary Zn-air batteries regarding e.g. power density and cycle life. Some of the challenges are related to morphological changes in the anode during cycling due to combined electrochemical and chemical processes involved in the reversible Zn – ZnO transformation. We present a unique in situ synchrotron X-ray diffraction study, where a combination of time and spatial resolution allows information about transformation and transport in a Zn/ZnO anode during discharge/charge operation. By tracking Zn and ZnO reflections during cycling of two Zn-air batteries we see that the conversion of these phases is accompanied by transport into the anode and the anode configuration does not return to its initial state after recharge due to ZnO migration to other parts of the battery. During charge Zn metal is deposited as microcrystalline material, changing the morphology and phase distribution in the anode. The XRD results were supported by qualitative in situ X-ray computed tomography that confirms depletion of ZnO and non-homogeneous distribution of Zn.",
author = "Christensen, {Mathias K.} and Mathiesen, {Jette Katja} and Simonsen, {S{\o}ren Bredmose} and Poul Norby",
year = "2019",
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doi = "10.1039/C8TA11554K",
language = "English",
volume = "7",
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journal = "Journal of Materials Chemistry A",
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Transformation and migration in secondary zinc-air batteries studied by in situ synchrotron X-ray diffraction and X-ray tomography. / Christensen, Mathias K.; Mathiesen, Jette Katja ; Simonsen, Søren Bredmose; Norby, Poul.

In: Journal of Materials Chemistry A, Vol. 7, No. 11, 01.01.2019, p. 6459-6466.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Transformation and migration in secondary zinc-air batteries studied by in situ synchrotron X-ray diffraction and X-ray tomography

AU - Christensen, Mathias K.

AU - Mathiesen, Jette Katja

AU - Simonsen, Søren Bredmose

AU - Norby, Poul

PY - 2019/1/1

Y1 - 2019/1/1

N2 - There are numerous challenges associated with developing secondary Zn-air batteries regarding e.g. power density and cycle life. Some of the challenges are related to morphological changes in the anode during cycling due to combined electrochemical and chemical processes involved in the reversible Zn – ZnO transformation. We present a unique in situ synchrotron X-ray diffraction study, where a combination of time and spatial resolution allows information about transformation and transport in a Zn/ZnO anode during discharge/charge operation. By tracking Zn and ZnO reflections during cycling of two Zn-air batteries we see that the conversion of these phases is accompanied by transport into the anode and the anode configuration does not return to its initial state after recharge due to ZnO migration to other parts of the battery. During charge Zn metal is deposited as microcrystalline material, changing the morphology and phase distribution in the anode. The XRD results were supported by qualitative in situ X-ray computed tomography that confirms depletion of ZnO and non-homogeneous distribution of Zn.

AB - There are numerous challenges associated with developing secondary Zn-air batteries regarding e.g. power density and cycle life. Some of the challenges are related to morphological changes in the anode during cycling due to combined electrochemical and chemical processes involved in the reversible Zn – ZnO transformation. We present a unique in situ synchrotron X-ray diffraction study, where a combination of time and spatial resolution allows information about transformation and transport in a Zn/ZnO anode during discharge/charge operation. By tracking Zn and ZnO reflections during cycling of two Zn-air batteries we see that the conversion of these phases is accompanied by transport into the anode and the anode configuration does not return to its initial state after recharge due to ZnO migration to other parts of the battery. During charge Zn metal is deposited as microcrystalline material, changing the morphology and phase distribution in the anode. The XRD results were supported by qualitative in situ X-ray computed tomography that confirms depletion of ZnO and non-homogeneous distribution of Zn.

U2 - 10.1039/C8TA11554K

DO - 10.1039/C8TA11554K

M3 - Journal article

VL - 7

SP - 6459

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JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

SN - 2050-7488

IS - 11

ER -