Miscible Polyether/Poly(ether-acetal) Electrolyte Blends.

Gao, KW; Loo, WS; Snyder, RL; Abel, BA; Choo, Y; Lee, A; Teixeira, SCM; Garetz, BA; Coates, GW; Balsara, NP

Miscible Polyether/Poly(ether-acetal) Electrolyte Blends.

Gao, KW Loo, WS Snyder, RL Abel, BA Choo, Y

Lee, A Teixeira, SCM Garetz, BA Coates, GW Balsara, NP

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Publisher:: AMER CHEMICAL SOC
Publication Type:: Journal Article
Citation:: Macromolecules, 2020, 53, (14), pp. https-//doi.org/10.1021/acs.macromol.0c00747
Issue Date:: 2020

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Field	Value	Language
dc.contributor.author	Gao, KW
dc.contributor.author	Loo, WS
dc.contributor.author	Snyder, RL
dc.contributor.author	Abel, BA
dc.contributor.author	Choo, Y https://orcid.org/0000-0003-2715-0618
dc.contributor.author	Lee, A
dc.contributor.author	Teixeira, SCM
dc.contributor.author	Garetz, BA
dc.contributor.author	Coates, GW
dc.contributor.author	Balsara, NP
dc.date.accessioned	2022-10-30T18:40:16Z
dc.date.available	2022-10-30T18:40:16Z
dc.date.issued	2020
dc.identifier.citation	Macromolecules, 2020, 53, (14), pp. https-//doi.org/10.1021/acs.macromol.0c00747
dc.identifier.issn	0024-9297
dc.identifier.issn	1520-5835
dc.identifier.uri	http://hdl.handle.net/10453/162935
dc.description.abstract	This study shows that it is possible to obtain homogeneous mixtures of two chemically distinct polymers with a lithium salt for electrolytic applications. This approach is motivated by the success of using mixtures of organic solvents in modern lithium-ion batteries. The properties of mixtures of a polyether, poly(ethylene oxide) (PEO), a poly(ether-acetal), poly(1,3,6-trioxocane) (P(2EO-MO)), and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt were studied by small-angle neutron scattering (SANS) and electrochemical characterization in symmetric cells. The SANS data are used to determine the miscibility window and quantify the effect of added salt on the thermodynamic interactions between the polymers. In the absence of salt, PEO/P(2EO-MO) blends are homogeneous and characterized by attractive interactions, i.e., a negative Flory-Huggins interaction parameter, χ. The addition of small amounts of salt results in a positive effective Flory-Huggins interaction parameter, χ eff, and macrophase separation. Surprisingly, miscible blends and negative χ eff parameters are obtained when the salt concentration is increased beyond a critical value. The electrochemical properties of PEO/P(2EO-MO)/LiTFSI blends at a given salt concentration were close to those obtained in PEO/LiTFSI electrolytes at the same salt concentration. This suggests that in the presence of PEO the electrochemical properties exhibited by P(2EO-MO) chains are similar to those of PEO chains. This work opens the door to a new direction for creating new and improved polymer electrolytes either by combining existing polymers and salt or by synthesizing new polymers with the specific aim of including them in miscible polymer blend electrolytes.
dc.format	Print
dc.language	eng
dc.publisher	AMER CHEMICAL SOC
dc.relation.ispartof	Macromolecules
dc.relation.isbasedon	10.1021/acs.macromol.0c00747
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	03 Chemical Sciences, 09 Engineering
dc.subject.classification	Polymers
dc.title	Miscible Polyether/Poly(ether-acetal) Electrolyte Blends.
dc.type	Journal Article
utslib.citation.volume	53
utslib.location.activity	United States
utslib.for	03 Chemical Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	closed_access	*
dc.date.updated	2022-10-30T18:40:15Z
pubs.issue	14
pubs.publication-status	Published
pubs.volume	53
utslib.citation.issue	14

Abstract:

This study shows that it is possible to obtain homogeneous mixtures of two chemically distinct polymers with a lithium salt for electrolytic applications. This approach is motivated by the success of using mixtures of organic solvents in modern lithium-ion batteries. The properties of mixtures of a polyether, poly(ethylene oxide) (PEO), a poly(ether-acetal), poly(1,3,6-trioxocane) (P(2EO-MO)), and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt were studied by small-angle neutron scattering (SANS) and electrochemical characterization in symmetric cells. The SANS data are used to determine the miscibility window and quantify the effect of added salt on the thermodynamic interactions between the polymers. In the absence of salt, PEO/P(2EO-MO) blends are homogeneous and characterized by attractive interactions, i.e., a negative Flory-Huggins interaction parameter, χ. The addition of small amounts of salt results in a positive effective Flory-Huggins interaction parameter, χ eff, and macrophase separation. Surprisingly, miscible blends and negative χ eff parameters are obtained when the salt concentration is increased beyond a critical value. The electrochemical properties of PEO/P(2EO-MO)/LiTFSI blends at a given salt concentration were close to those obtained in PEO/LiTFSI electrolytes at the same salt concentration. This suggests that in the presence of PEO the electrochemical properties exhibited by P(2EO-MO) chains are similar to those of PEO chains. This work opens the door to a new direction for creating new and improved polymer electrolytes either by combining existing polymers and salt or by synthesizing new polymers with the specific aim of including them in miscible polymer blend electrolytes.

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http://hdl.handle.net/10453/162935