A study of phase behavior and conductivity of mixtures of the organic ionic plastic crystal N-methyl-N-methyl-pyrrolidinium dicyanamide with sodium dicyanamide

Tarekegn, Chimdi, Gunzelmann, Daniel, Vongsvivut, Jitraporn and Forsyth, Maria 2015, A study of phase behavior and conductivity of mixtures of the organic ionic plastic crystal N-methyl-N-methyl-pyrrolidinium dicyanamide with sodium dicyanamide, Solid state ionics, vol. 272, pp. 74-83, doi: 10.1016/j.ssi.2014.12.018.

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Title A study of phase behavior and conductivity of mixtures of the organic ionic plastic crystal N-methyl-N-methyl-pyrrolidinium dicyanamide with sodium dicyanamide
Author(s) Tarekegn, Chimdi
Gunzelmann, Daniel
Vongsvivut, Jitraporn
Forsyth, MariaORCID iD for Forsyth, Maria orcid.org/0000-0002-4273-8105
Journal name Solid state ionics
Volume number 272
Start page 74
End page 83
Total pages 10
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015
ISSN 0167-2738
Keyword(s) N-methyl-N-methyl-pyrrolidinium dicyanamide
Organic ionic plastic crystal
Sodium
Solid-state electrolyte
Solid-state NMR
Science & Technology
Physical Sciences
Chemistry, Physical
Physics, Condensed Matter
Chemistry
Physics
LITHIUM-METAL BATTERIES
PROPYLPYRROLIDINIUM TETRAFLUOROBORATE
X-RAY
SALTS
ELECTROLYTES
DYNAMICS
TRANSPORT
LIQUIDS
SPECTROSCOPY
DIFFRACTION
Summary We report on the thermal, structural and conductivity properties of the organic ionic plastic crystal (OIPC) N-methyl-N-methyl-pyrrolidinium dicyanamide [C1mpyr][N(CN)2] mixed with the sodium salt Na[N(CN)2]. The DSC thermal traces indicate that an isothermal transition, which may be a eutectic melting, occurs at ~ 89 °C, below which all compositions are entirely in the solid phase. At 20 mol% Na[N(CN)2], this transition is the final melt for this mixture, and a new liquidus peak grows beyond 20 mol% Na[N(CN)2]. The III- > II solid-solid phase transition continues to be evident at ~- 2 °C. The microstructure for all the mixtures indicated a phase separated morphology where precipitates can be clearly observed. Most likely, these precipitates consist of a Na-rich second phase. This was also suggested from the vibrational spectroscopy and the 23Na NMR spectra. The lower concentrations of Na[N(CN)2] present complex 23Na MAS spectra, suggesting more than one sodium ion environment is present in these mixtures consistent with complex phase behavior. Unlike other OIPCs where the ionic conductivity usually increases upon doping or mixing in a second component, the conductivity of these mixtures remains relatively constant and above 10- 4 S cm- 1 at ∼ 80 °C, even in the solid state. Such high conductivities suggest these materials may be promising to be used for all solid-state electrochemical devices.
Language eng
DOI 10.1016/j.ssi.2014.12.018
Field of Research 091205 Functional Materials
030604 Electrochemistry
Socio Economic Objective 850602 Energy Storage (excl. Hydrogen)
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Grant ID LE11010014
FL110100012
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30073751

Document type: Journal Article
Collections: Institute for Frontier Materials
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