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Physical and electrochemical properties of low molecular weight poly(ethylene glycol)‐bridged polysilsesquioxane organic–inorganic composite electrolytes via sol–gel process
Author(s) -
Yuan C. Y.,
Chen S. Y.,
Tang J. C.,
Yang H. C.,
ChenYang Y. W.
Publication year - 2006
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.25367
Subject(s) - ethylene glycol , ionic conductivity , electrolyte , materials science , polymer chemistry , electrochemistry , conductivity , peg ratio , composite number , polymer , chemical engineering , ionic bonding , ion , chemistry , composite material , organic chemistry , electrode , finance , economics , engineering
A new class of ionic conducting organic/inorganic hybrid composite electrolyte with high conductivity, better electrochemical stability and mechanical behavior was prepared through the sol–gel processing between ethylene‐bridged polysilsesquioxane and poly(ethylene glycol) (PEG). The composite electrolyte with 0.05 LiClO 4 per PEG repeat unit has the best conductivity up to 10 −4 S/cm at room temperature with the transference number up to 0.48 and an electrochemical stability window as high as 5.5 V versus Li/Li + . Moreover, the effect of the PEG chain length on the properties of the composite electrolyte has also been studied. The interactions between ions and polymer have also been investigated for the composite electrolyte in the presence of LiClO 4 by means of FTIR, DSC, and TGA. The results indicated the interaction of Li + ions with the ether oxygen of the PEG, and the formation of transient crosslinking with LiClO 4 , resulting in an increase of the T g of the composite electrolyte. The VTF‐type behavior of the ionic conductivity implied that the diffusion of the charge carriers was assisted by the segmental motions of the polymer chains. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 2752–2758, 2007