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Effect of varying the composition and nanostructure of organic carbonate-containing lyotropic liquid crystal polymer electrolytes on their ionic conductivity

Kerr, Robert L. and Edwards, Julian P. and Jones, Simon C. and Elliott, Brian J. and Gin, Douglas L. (2016) Effect of varying the composition and nanostructure of organic carbonate-containing lyotropic liquid crystal polymer electrolytes on their ionic conductivity. Polymer Journal, 48 (5). pp. 635-643. ISSN 0032-3896. doi:10.1038/pj.2015.119. https://resolver.caltech.edu/CaltechAUTHORS:20160610-091706637

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Abstract

Nanostructured composite electrolyte films consisting of a cross-linked lyotropic liquid crystal (LLC) monomer, an organic carbonate liquid electrolyte (propylene carbonate, dimethylcarbonate, diethylcarbonate) and a Li salt (LiClO_4, LiBF_4, LiPF_6) were systematically prepared and characterized at two electrolyte concentrations (0.245 and 1.0 m) and four liquid loading levels (5, 15, 30, 50 wt %). The LLC morphology of the films was investigated using polarized light microscopy and powder X-ray diffraction; their ionic conductivity was investigated using AC impedance measurements. Higher liquid electrolyte loadings and Li salt concentrations generally increased ionic conductivity, regardless of the liquid electrolyte or salt used. Some mixed-phase LLC morphologies displayed good ionic conductivity; however, as initially prepared, these formulations were at the limit of liquid uptake. In contrast, composites with a type II bicontinuous cubic (QII) LLC phase containing ordered, three-dimensional interconnected nanopores exhibited good conductivity using much less liquid electrolyte and a lower Li salt concentration, indicating that this structure is more amenable to ion transport than less ordered/uniform morphologies. When wetted with electrolyte solution and integrated into Li/fluorinated carbon coin cells, the QII films were sufficiently strong to act as an ion-conductive separator and displayed stable open-circuit potentials. Many of the mixed-phase films gave shorted cells.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1038/pj.2015.119DOIArticle
http://www.nature.com/pj/journal/v48/n5/abs/pj2015119a.htmlPublisherArticle
http://www.nature.com/pj/journal/v48/n5/suppinfo/pj2015119s1.html?url=/pj/journal/v48/n5/abs/pj2015119a.htmlRelated ItemSupplementary Information
ORCID:
AuthorORCID
Jones, Simon C.0000-0002-1952-3720
Additional Information:© 2016 The Society of Polymer Science, Japan (SPSJ). Received 3 October 2015; Revised 17 November 2015; Accepted 21 November 2015. Advance online publication 27 January 2016. This work was funded by the U.S. Department of Energy via an STTR Grant to TDA Research with a subcontract to CU Boulder (DE-FG02-04ER84093) and the NSF Liquid Crystal Materials Research Center at CU Boulder (DMR-0820579).
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-04ER84093
NSFDMR-0820579
Issue or Number:5
DOI:10.1038/pj.2015.119
Record Number:CaltechAUTHORS:20160610-091706637
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160610-091706637
Official Citation:Effect of varying the composition and nanostructure of organic carbonate-containing lyotropic liquid crystal polymer electrolytes on their ionic conductivity Robert L Kerr, Julian P Edwards, Simon C Jones, Brian J Elliott and Douglas L Gin Polym J 48: 635-643; advance online publication, January 27, 2016; doi:10.1038/pj.2015.119
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67818
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:10 Jun 2016 18:37
Last Modified:11 Nov 2021 03:55

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