Enhanced ionic mobility in Organic Ionic Plastic Crystal - Dendrimer solid electrolytes

TY - JOUR

T1 - Enhanced ionic mobility in Organic Ionic Plastic Crystal - Dendrimer solid electrolytes

AU - Greene, G. W.

AU - Ponzio, F.

AU - Iranipour, N.

AU - Zhu, H.

AU - Seeber, A.

AU - Forsyth, M.

AU - Howlett, P. C.

N1 - Publisher Copyright: © 2015 Elsevier Ltd. All rights reserved.

PY - 2015/8/22

Y1 - 2015/8/22

N2 - We report the first study of the characterisation of the organic ionic plastic crystal (OIPC) N-ethyl-N-methylpyrrolidinium tetrafluoroborate (C2mpyrBF4) upon mixing with a dendrimer additive. Whereas previous reports of OIPC composite formation (i.e. with ceramics and polymers) have typically reported a decrease in the conductivity when lithium salt had been added, the addition of dendrimer is shown to lead to a substantial enhancement in the lithium containing system, approaching 3 orders of magnitude at 30 °C. Mechanical analysis indicates that dendrimer addition leads to a softer more ductile material while microscopy shows that the dendrimer is uniformly distributed and that the crystal microstructure is substantially disrupted, ultimately adopting a dendritic microstructure at 1 mol% dendrimer content. Thermal analysis indicates a new phase in the lithium OIPC system, the crystallisation of which is suppressed in the presence of dendrimer. Instead, a decrease in the phase transition enthalpies indicates a large increase in the amorphous component of the Lithium OIPC, particularly for the most conductive system -C2mpyrBF4 + 10 mol% LiBF4 + 0.1 mol% dendrimer. Variable temperature powder X-ray diffraction confirms the presence of a new distinct phase and its absence in the presence of dendrimer. A change in the progression of the thermal phase behaviour of the OIPC in the presence of dendrimer is also shown, exhibiting the phase I (high temperature) structure at temperatures below the phase II-I transition.

AB - We report the first study of the characterisation of the organic ionic plastic crystal (OIPC) N-ethyl-N-methylpyrrolidinium tetrafluoroborate (C2mpyrBF4) upon mixing with a dendrimer additive. Whereas previous reports of OIPC composite formation (i.e. with ceramics and polymers) have typically reported a decrease in the conductivity when lithium salt had been added, the addition of dendrimer is shown to lead to a substantial enhancement in the lithium containing system, approaching 3 orders of magnitude at 30 °C. Mechanical analysis indicates that dendrimer addition leads to a softer more ductile material while microscopy shows that the dendrimer is uniformly distributed and that the crystal microstructure is substantially disrupted, ultimately adopting a dendritic microstructure at 1 mol% dendrimer content. Thermal analysis indicates a new phase in the lithium OIPC system, the crystallisation of which is suppressed in the presence of dendrimer. Instead, a decrease in the phase transition enthalpies indicates a large increase in the amorphous component of the Lithium OIPC, particularly for the most conductive system -C2mpyrBF4 + 10 mol% LiBF4 + 0.1 mol% dendrimer. Variable temperature powder X-ray diffraction confirms the presence of a new distinct phase and its absence in the presence of dendrimer. A change in the progression of the thermal phase behaviour of the OIPC in the presence of dendrimer is also shown, exhibiting the phase I (high temperature) structure at temperatures below the phase II-I transition.

KW - Plastic Crystal

KW - batteries

KW - dendrimer

KW - ion conductor

KW - solid electrolyte

UR - http://www.scopus.com/inward/record.url?scp=84940712187&partnerID=8YFLogxK

U2 - 10.1016/j.electacta.2015.03.127

DO - 10.1016/j.electacta.2015.03.127

M3 - 文章

AN - SCOPUS:84940712187

SN - 0013-4686

VL - 175

SP - 214

EP - 223

JO - Electrochimica Acta

JF - Electrochimica Acta

ER -