Identifying fast Li ions at the interfaces in composites of ionic liquids (EMIMTFSI) and Li salts (LiTFSI) by long-time 7Li NMR

Bernhard Stanje, Patrick Bottke, Ilie Hanzu, Maciej Marczewski, Patrick Johansson, Martin Wilkening

Publikation: KonferenzbeitragPosterForschungBegutachtung

Abstract

New electrolytes are needed in lithium-based battery research in order to increase both safety and electrochemical performance. The mixture of an ionic liquid with a lithium salt represents a conceptually new class of electrolytes for high-temperature lithium batteries, termed ?ionic liquid-in-salt?. We used 7Li NMR spectroscopy, see, e.g., to study both local electronic structures and Li self-diffu¬sion in LiTFSI and LixEMIM(1-x)TFSI with x = 0.9. The NMR spectra, recorded under static conditions, perfectly agree with the results from differential scanning calorimetry. Upon heating to 513 K they clearly reveal several double phase regions; the known solid-state phase transformation of LiTFSI can be well recognized by the change of the quadruple powder pattern of the 7Li NMR spectra of LiTFSI. A rapid increase in long-range ion conductivity, within two orders of magnitudes, takes place when the 1/2 EMIMTFSI/LiTFSI phase starts to melt. This can also be monitored by tempera ture-variable 7Li spin-lattice relaxation (SLR) NMR. If recorded up to delay times of 1000 s, the pronounced bi-exponential 7Li SLR NMR transients found directly reveal a subset of highly mobile Li ions, partly identified as [Li(TFSI)2]-, which can be well discriminated from the response of pure LiTFSI. Most likely, this Li sub-ensemble, which is anticipated to be located at the LiTFSI:EMIMTFSI interfacial regions, is responsible for the enhanced ion conductivity observed.
Originalspracheenglisch
PublikationsstatusVeröffentlicht - 2016
VeranstaltungE-MRS 2016 Spring Meeting - Lille, Frankreich
Dauer: 2 Mai 20166 Mai 2016

Konferenz

KonferenzE-MRS 2016 Spring Meeting
LandFrankreich
OrtLille
Zeitraum2/05/166/05/16

Dies zitieren

Stanje, B., Bottke, P., Hanzu, I., Marczewski, M., Johansson, P., & Wilkening, M. (2016). Identifying fast Li ions at the interfaces in composites of ionic liquids (EMIMTFSI) and Li salts (LiTFSI) by long-time 7Li NMR. Postersitzung präsentiert bei E-MRS 2016 Spring Meeting, Lille, Frankreich.

Identifying fast Li ions at the interfaces in composites of ionic liquids (EMIMTFSI) and Li salts (LiTFSI) by long-time 7Li NMR. / Stanje, Bernhard; Bottke, Patrick; Hanzu, Ilie; Marczewski, Maciej; Johansson, Patrick; Wilkening, Martin.

2016. Postersitzung präsentiert bei E-MRS 2016 Spring Meeting, Lille, Frankreich.

Publikation: KonferenzbeitragPosterForschungBegutachtung

Stanje, B, Bottke, P, Hanzu, I, Marczewski, M, Johansson, P & Wilkening, M 2016, 'Identifying fast Li ions at the interfaces in composites of ionic liquids (EMIMTFSI) and Li salts (LiTFSI) by long-time 7Li NMR' E-MRS 2016 Spring Meeting, Lille, Frankreich, 2/05/16 - 6/05/16, .
Stanje B, Bottke P, Hanzu I, Marczewski M, Johansson P, Wilkening M. Identifying fast Li ions at the interfaces in composites of ionic liquids (EMIMTFSI) and Li salts (LiTFSI) by long-time 7Li NMR. 2016. Postersitzung präsentiert bei E-MRS 2016 Spring Meeting, Lille, Frankreich.
Stanje, Bernhard ; Bottke, Patrick ; Hanzu, Ilie ; Marczewski, Maciej ; Johansson, Patrick ; Wilkening, Martin. / Identifying fast Li ions at the interfaces in composites of ionic liquids (EMIMTFSI) and Li salts (LiTFSI) by long-time 7Li NMR. Postersitzung präsentiert bei E-MRS 2016 Spring Meeting, Lille, Frankreich.
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title = "Identifying fast Li ions at the interfaces in composites of ionic liquids (EMIMTFSI) and Li salts (LiTFSI) by long-time 7Li NMR",
abstract = "New electrolytes are needed in lithium-based battery research in order to increase both safety and electrochemical performance. The mixture of an ionic liquid with a lithium salt represents a conceptually new class of electrolytes for high-temperature lithium batteries, termed ?ionic liquid-in-salt?. We used 7Li NMR spectroscopy, see, e.g., to study both local electronic structures and Li self-diffu¬sion in LiTFSI and LixEMIM(1-x)TFSI with x = 0.9. The NMR spectra, recorded under static conditions, perfectly agree with the results from differential scanning calorimetry. Upon heating to 513 K they clearly reveal several double phase regions; the known solid-state phase transformation of LiTFSI can be well recognized by the change of the quadruple powder pattern of the 7Li NMR spectra of LiTFSI. A rapid increase in long-range ion conductivity, within two orders of magnitudes, takes place when the 1/2 EMIMTFSI/LiTFSI phase starts to melt. This can also be monitored by tempera ture-variable 7Li spin-lattice relaxation (SLR) NMR. If recorded up to delay times of 1000 s, the pronounced bi-exponential 7Li SLR NMR transients found directly reveal a subset of highly mobile Li ions, partly identified as [Li(TFSI)2]-, which can be well discriminated from the response of pure LiTFSI. Most likely, this Li sub-ensemble, which is anticipated to be located at the LiTFSI:EMIMTFSI interfacial regions, is responsible for the enhanced ion conductivity observed.",
author = "Bernhard Stanje and Patrick Bottke and Ilie Hanzu and Maciej Marczewski and Patrick Johansson and Martin Wilkening",
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T1 - Identifying fast Li ions at the interfaces in composites of ionic liquids (EMIMTFSI) and Li salts (LiTFSI) by long-time 7Li NMR

AU - Stanje, Bernhard

AU - Bottke, Patrick

AU - Hanzu, Ilie

AU - Marczewski, Maciej

AU - Johansson, Patrick

AU - Wilkening, Martin

PY - 2016

Y1 - 2016

N2 - New electrolytes are needed in lithium-based battery research in order to increase both safety and electrochemical performance. The mixture of an ionic liquid with a lithium salt represents a conceptually new class of electrolytes for high-temperature lithium batteries, termed ?ionic liquid-in-salt?. We used 7Li NMR spectroscopy, see, e.g., to study both local electronic structures and Li self-diffu¬sion in LiTFSI and LixEMIM(1-x)TFSI with x = 0.9. The NMR spectra, recorded under static conditions, perfectly agree with the results from differential scanning calorimetry. Upon heating to 513 K they clearly reveal several double phase regions; the known solid-state phase transformation of LiTFSI can be well recognized by the change of the quadruple powder pattern of the 7Li NMR spectra of LiTFSI. A rapid increase in long-range ion conductivity, within two orders of magnitudes, takes place when the 1/2 EMIMTFSI/LiTFSI phase starts to melt. This can also be monitored by tempera ture-variable 7Li spin-lattice relaxation (SLR) NMR. If recorded up to delay times of 1000 s, the pronounced bi-exponential 7Li SLR NMR transients found directly reveal a subset of highly mobile Li ions, partly identified as [Li(TFSI)2]-, which can be well discriminated from the response of pure LiTFSI. Most likely, this Li sub-ensemble, which is anticipated to be located at the LiTFSI:EMIMTFSI interfacial regions, is responsible for the enhanced ion conductivity observed.

AB - New electrolytes are needed in lithium-based battery research in order to increase both safety and electrochemical performance. The mixture of an ionic liquid with a lithium salt represents a conceptually new class of electrolytes for high-temperature lithium batteries, termed ?ionic liquid-in-salt?. We used 7Li NMR spectroscopy, see, e.g., to study both local electronic structures and Li self-diffu¬sion in LiTFSI and LixEMIM(1-x)TFSI with x = 0.9. The NMR spectra, recorded under static conditions, perfectly agree with the results from differential scanning calorimetry. Upon heating to 513 K they clearly reveal several double phase regions; the known solid-state phase transformation of LiTFSI can be well recognized by the change of the quadruple powder pattern of the 7Li NMR spectra of LiTFSI. A rapid increase in long-range ion conductivity, within two orders of magnitudes, takes place when the 1/2 EMIMTFSI/LiTFSI phase starts to melt. This can also be monitored by tempera ture-variable 7Li spin-lattice relaxation (SLR) NMR. If recorded up to delay times of 1000 s, the pronounced bi-exponential 7Li SLR NMR transients found directly reveal a subset of highly mobile Li ions, partly identified as [Li(TFSI)2]-, which can be well discriminated from the response of pure LiTFSI. Most likely, this Li sub-ensemble, which is anticipated to be located at the LiTFSI:EMIMTFSI interfacial regions, is responsible for the enhanced ion conductivity observed.

M3 - Poster

ER -