NDLI: A single cation or anion dendrimer-based liquid electrolyte

Content Provider	Royal Society of Chemistry (RSC)
Author	Forsyth, Maria Jayappa, Rudresha B. Bhattacharyya, Aninda J. Zhu, Haijin Sen, Sudeshna
Copyright Year	2016
Abstract	We propose here a novel liquid dendrimer-based single ion conductor as a potential alternative to conventional molecular liquid solvent–salt solutions in rechargeable batteries, sensors and actuators. A specific change from ester (–COOR) to cyano (–CN) terminated peripheral groups in generation-one poly(propyl ether imine) (G1-PETIM)–lithium salt complexes results in a remarkable switchover from a high cation (tLi+ = 0.9 for –COOR) to a high anion (tPF6− = 0.8 for –CN) transference number. This observed switchover draws an interesting analogy with the concept of heterogeneous doping, applied successfully to account for similar changes in ionic conductivity arising out of dispersion of insulator particle inclusions in weak inorganic solid electrolytes. The change in peripheral group simultaneously affects the effective ionic conductivity, with the room temperature ionic conductivity of PETIM–CN (1.9 × 10−5 Ω−1 cm−1) being an order of magnitude higher than PETIM–COOR (1.9 × 10−6 Ω−1 cm−1). Notably, no significant changes are observed in the lithium mobility even following changes in viscosity due to the change in the peripheral group. Changes in the peripheral chemical functionality directly influence the anion mobility, being lower in PETIM–COOR than in PETIM–CN, which ultimately becomes the sole parameter controlling the effective transport and electrochemical properties of the dendrimer electrolytes.
Starting Page	3390
Ending Page	3398
Page Count	9
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	7
Issue Number	5
Journal	Chemical Science
DOI	10.1039/c5sc04584c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Viscosity Ester Cyanide Dendrimer PETIM Ether Dopant Electrochemistry Ion Lithium Imine London dispersion force
Content Type	Text
Resource Type	Article
Subject	Chemistry

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