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Introducing Interlayer Electrolytes: Toward Room-Temperature High-Potential Solid-State Rechargeable Fluoride Ion Batteries

Irshad Mohammad, Raiker Witter, Maximilian Fichtner, M. Anji Reddy, Anji Munnangi Orcid Logo

ACS Applied Energy Materials, Volume: 2, Issue: 2, Pages: 1553 - 1562

Swansea University Author: Anji Munnangi Orcid Logo

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DOI (Published version): 10.1021/acsaem.8b02166

Abstract

Solid-state fluoride ion batteries (FIBs) promise high specific energy, thermal stability, and safety. Research on FIBs is in its infancy, and a number of issues still need to be addressed to realize its full potential. Progress on FIB strongly depends on developing suitable fluoride-ion-transportin...

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Published in: ACS Applied Energy Materials
ISSN: 2574-0962 2574-0962
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa51583
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fullrecord <?xml version="1.0"?><rfc1807><datestamp>2019-09-03T10:28:43.4504002</datestamp><bib-version>v2</bib-version><id>51583</id><entry>2019-08-27</entry><title>Introducing Interlayer Electrolytes: Toward Room-Temperature High-Potential Solid-State Rechargeable Fluoride Ion Batteries</title><swanseaauthors><author><sid>3ed0b4f2ff4fb9e87c7a73e7a3c39da7</sid><ORCID>0000-0001-9101-0252</ORCID><firstname>Anji</firstname><surname>Munnangi</surname><name>Anji Munnangi</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2019-08-27</date><deptcode>MTLS</deptcode><abstract>Solid-state fluoride ion batteries (FIBs) promise high specific energy, thermal stability, and safety. Research on FIBs is in its infancy, and a number of issues still need to be addressed to realize its full potential. Progress on FIB strongly depends on developing suitable fluoride-ion-transporting electrolytes at room temperature (RT). BaSnF4 shows high ionic conductivity of 3.5 &#xD7; 10&#x2013;4 S cm&#x2013;1 at RT. However, it has limited electrochemical stability window. Recently, we demonstrated RT rechargeable FIB utilizing BaSnF4 as a solid electrolyte and low electropositive metals, such as Sn and Zn metals, as anodes because of the limited electrochemical stability of BaSnF4, which results in low operating voltages. However, to enable cells with high operating potentials, the electrolyte should be compatible with highly electropositive metals (e.g., La, Ce). Although tysonite-type La0.9Ba0.1F2.9 electrolyte was shown to be compatible with such metals, it has the drawback of low ionic conductivity at RT (0.4 &#xD7; 10&#x2013;6 S cm&#x2013;1). To overcome these limitations of the low electrolyte stability and low ionic conductivity, we applied an interlayer electrolyte to build FIB rather than pure electrolytes. A thin layer of La0.9Ba0.1F2.9 was pressed together with a thick layer of BaSnF4. Applying low-conductive La0.9Ba0.1F2.9 as thin layer enhanced the total conductance of the pellet (compared to pure La0.9Ba0.1F2.9), while it physically isolated the less stable and highly conductive electrolyte (BaSnF4) from the anode. This approach allowed the demonstration of relatively high voltage FIBs at RT, which can otherwise not operate either with BaSnF4 electrolyte alone. We optimized the total ionic conductivity of the interlayer electrolyte by altering the thickness of the La0.9Ba0.1F2.9 layer. The total ionic conductivity of interlayer electrolyte was increased to 0.89 &#xD7; 10&#x2013;5 S cm&#x2013;1 for 45 &#x3BC;m thick La0.9Ba0.1F2.9 at RT, which is more than 1 order of magnitude higher compared to the pure La0.9Ba0.1F2.9 (0.4 &#xD7; 10&#x2013;6 S cm&#x2013;1). Finally, we demonstrate the feasibility of operating FIB at RT utilizing the interlayer pellet as an electrolyte, BiF3 as a cathode and Ce as an anode material. The approach described here would enable the design and development of new solid electrolytes with advanced properties with existing electrolytes.</abstract><type>Journal Article</type><journal>ACS Applied Energy Materials</journal><volume>2</volume><journalNumber>2</journalNumber><paginationStart>1553</paginationStart><paginationEnd>1562</paginationEnd><publisher/><issnPrint>2574-0962</issnPrint><issnElectronic>2574-0962</issnElectronic><keywords>room-temperature fluoride ion batteries, interlayer electrolyte, fluoride ion conductors, La0.9Ba0.1F2.9, BaSnF4, Ce anode, BiF3 cathode</keywords><publishedDay>25</publishedDay><publishedMonth>2</publishedMonth><publishedYear>2019</publishedYear><publishedDate>2019-02-25</publishedDate><doi>10.1021/acsaem.8b02166</doi><url/><notes/><college>COLLEGE NANME</college><department>Materials Science and Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>MTLS</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2019-09-03T10:28:43.4504002</lastEdited><Created>2019-08-27T12:27:12.5364650</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Engineering and Applied Sciences - Materials Science and Engineering</level></path><authors><author><firstname>Irshad</firstname><surname>Mohammad</surname><order>1</order></author><author><firstname>Raiker</firstname><surname>Witter</surname><order>2</order></author><author><firstname>Maximilian</firstname><surname>Fichtner</surname><order>3</order></author><author><firstname>M. Anji</firstname><surname>Reddy</surname><order>4</order></author><author><firstname>Anji</firstname><surname>Munnangi</surname><orcid>0000-0001-9101-0252</orcid><order>5</order></author></authors><documents/><OutputDurs/></rfc1807>
spelling 2019-09-03T10:28:43.4504002 v2 51583 2019-08-27 Introducing Interlayer Electrolytes: Toward Room-Temperature High-Potential Solid-State Rechargeable Fluoride Ion Batteries 3ed0b4f2ff4fb9e87c7a73e7a3c39da7 0000-0001-9101-0252 Anji Munnangi Anji Munnangi true false 2019-08-27 MTLS Solid-state fluoride ion batteries (FIBs) promise high specific energy, thermal stability, and safety. Research on FIBs is in its infancy, and a number of issues still need to be addressed to realize its full potential. Progress on FIB strongly depends on developing suitable fluoride-ion-transporting electrolytes at room temperature (RT). BaSnF4 shows high ionic conductivity of 3.5 × 10–4 S cm–1 at RT. However, it has limited electrochemical stability window. Recently, we demonstrated RT rechargeable FIB utilizing BaSnF4 as a solid electrolyte and low electropositive metals, such as Sn and Zn metals, as anodes because of the limited electrochemical stability of BaSnF4, which results in low operating voltages. However, to enable cells with high operating potentials, the electrolyte should be compatible with highly electropositive metals (e.g., La, Ce). Although tysonite-type La0.9Ba0.1F2.9 electrolyte was shown to be compatible with such metals, it has the drawback of low ionic conductivity at RT (0.4 × 10–6 S cm–1). To overcome these limitations of the low electrolyte stability and low ionic conductivity, we applied an interlayer electrolyte to build FIB rather than pure electrolytes. A thin layer of La0.9Ba0.1F2.9 was pressed together with a thick layer of BaSnF4. Applying low-conductive La0.9Ba0.1F2.9 as thin layer enhanced the total conductance of the pellet (compared to pure La0.9Ba0.1F2.9), while it physically isolated the less stable and highly conductive electrolyte (BaSnF4) from the anode. This approach allowed the demonstration of relatively high voltage FIBs at RT, which can otherwise not operate either with BaSnF4 electrolyte alone. We optimized the total ionic conductivity of the interlayer electrolyte by altering the thickness of the La0.9Ba0.1F2.9 layer. The total ionic conductivity of interlayer electrolyte was increased to 0.89 × 10–5 S cm–1 for 45 μm thick La0.9Ba0.1F2.9 at RT, which is more than 1 order of magnitude higher compared to the pure La0.9Ba0.1F2.9 (0.4 × 10–6 S cm–1). Finally, we demonstrate the feasibility of operating FIB at RT utilizing the interlayer pellet as an electrolyte, BiF3 as a cathode and Ce as an anode material. The approach described here would enable the design and development of new solid electrolytes with advanced properties with existing electrolytes. Journal Article ACS Applied Energy Materials 2 2 1553 1562 2574-0962 2574-0962 room-temperature fluoride ion batteries, interlayer electrolyte, fluoride ion conductors, La0.9Ba0.1F2.9, BaSnF4, Ce anode, BiF3 cathode 25 2 2019 2019-02-25 10.1021/acsaem.8b02166 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2019-09-03T10:28:43.4504002 2019-08-27T12:27:12.5364650 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Irshad Mohammad 1 Raiker Witter 2 Maximilian Fichtner 3 M. Anji Reddy 4 Anji Munnangi 0000-0001-9101-0252 5
title Introducing Interlayer Electrolytes: Toward Room-Temperature High-Potential Solid-State Rechargeable Fluoride Ion Batteries
spellingShingle Introducing Interlayer Electrolytes: Toward Room-Temperature High-Potential Solid-State Rechargeable Fluoride Ion Batteries
Anji Munnangi
title_short Introducing Interlayer Electrolytes: Toward Room-Temperature High-Potential Solid-State Rechargeable Fluoride Ion Batteries
title_full Introducing Interlayer Electrolytes: Toward Room-Temperature High-Potential Solid-State Rechargeable Fluoride Ion Batteries
title_fullStr Introducing Interlayer Electrolytes: Toward Room-Temperature High-Potential Solid-State Rechargeable Fluoride Ion Batteries
title_full_unstemmed Introducing Interlayer Electrolytes: Toward Room-Temperature High-Potential Solid-State Rechargeable Fluoride Ion Batteries
title_sort Introducing Interlayer Electrolytes: Toward Room-Temperature High-Potential Solid-State Rechargeable Fluoride Ion Batteries
author_id_str_mv 3ed0b4f2ff4fb9e87c7a73e7a3c39da7
author_id_fullname_str_mv 3ed0b4f2ff4fb9e87c7a73e7a3c39da7_***_Anji Munnangi
author Anji Munnangi
author2 Irshad Mohammad
Raiker Witter
Maximilian Fichtner
M. Anji Reddy
Anji Munnangi
format Journal article
container_title ACS Applied Energy Materials
container_volume 2
container_issue 2
container_start_page 1553
publishDate 2019
institution Swansea University
issn 2574-0962
2574-0962
doi_str_mv 10.1021/acsaem.8b02166
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 0
active_str 0
description Solid-state fluoride ion batteries (FIBs) promise high specific energy, thermal stability, and safety. Research on FIBs is in its infancy, and a number of issues still need to be addressed to realize its full potential. Progress on FIB strongly depends on developing suitable fluoride-ion-transporting electrolytes at room temperature (RT). BaSnF4 shows high ionic conductivity of 3.5 × 10–4 S cm–1 at RT. However, it has limited electrochemical stability window. Recently, we demonstrated RT rechargeable FIB utilizing BaSnF4 as a solid electrolyte and low electropositive metals, such as Sn and Zn metals, as anodes because of the limited electrochemical stability of BaSnF4, which results in low operating voltages. However, to enable cells with high operating potentials, the electrolyte should be compatible with highly electropositive metals (e.g., La, Ce). Although tysonite-type La0.9Ba0.1F2.9 electrolyte was shown to be compatible with such metals, it has the drawback of low ionic conductivity at RT (0.4 × 10–6 S cm–1). To overcome these limitations of the low electrolyte stability and low ionic conductivity, we applied an interlayer electrolyte to build FIB rather than pure electrolytes. A thin layer of La0.9Ba0.1F2.9 was pressed together with a thick layer of BaSnF4. Applying low-conductive La0.9Ba0.1F2.9 as thin layer enhanced the total conductance of the pellet (compared to pure La0.9Ba0.1F2.9), while it physically isolated the less stable and highly conductive electrolyte (BaSnF4) from the anode. This approach allowed the demonstration of relatively high voltage FIBs at RT, which can otherwise not operate either with BaSnF4 electrolyte alone. We optimized the total ionic conductivity of the interlayer electrolyte by altering the thickness of the La0.9Ba0.1F2.9 layer. The total ionic conductivity of interlayer electrolyte was increased to 0.89 × 10–5 S cm–1 for 45 μm thick La0.9Ba0.1F2.9 at RT, which is more than 1 order of magnitude higher compared to the pure La0.9Ba0.1F2.9 (0.4 × 10–6 S cm–1). Finally, we demonstrate the feasibility of operating FIB at RT utilizing the interlayer pellet as an electrolyte, BiF3 as a cathode and Ce as an anode material. The approach described here would enable the design and development of new solid electrolytes with advanced properties with existing electrolytes.
published_date 2019-02-25T04:03:32Z
_version_ 1763753288879046656
score 11.036378

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