Determination of the interaction using FTIR within the components of GPE based on the synthesized grafted polymer
writer：Yun Huang&Xiaoyan Ma&Shuhui Wang&Xu Wang& Yuanhua Lin
keywords：Rectorite. Grafted polymer. Gel polymer electrolytes.FTIR. Quantitative measurement.Li-ion batteries
source：期刊
specific source：Ionics, 2012,18(1-2), pp167-179
Issue time：2011年
An oxyethylene chain (–CH2–CH2–O–) grafted polymer
(P(MMA–MAh)–PEGME) was synthesized by reacting poly(ethylene glycol) monomethyl
ether (PEGME) with the copolymer of poly(methyl metacrylate–maleic anhydride)
(P(MMA–MAh)) and endcapping the residual carboxylic acid with methanol.
Rectorite modified with dodecyl benzyl dimethyl ammonium chloride (OREC) was
used as a filler additive to modify gel polymer electrolytes (GPE) that
consisted of P(MMA–MAh)–PEGME used as polymer matrix, propylene carbonate (PC)
as plasticizer and LiClO4as lithium ion producer. Characterization of
interaction of the polar group of C=O or C–O–C in PC and grafted polymer with Li+
and OH group on OREC surface has been thoroughly examined using Fourier
transform infrared (FTIR), respectively. The quantitative analysis of FTIR
shows that the absorptivity coefficients (a) of polymer/LiClO4,PC/LiClO4,
PC/OREC and polymer/OREC are 0.705, 0.113,0.430 and 0.500, respectively, which
means that the Li+ or OH bonded polar group of C=O and C–O–Cismore sensitive
than free C=O and C–O–CinFTIRspectra.The limitedvaluesofbondedC=OandC–O–C
equivalent fraction of polymer/LiClO4, PC/LiClO4,PC/ORECand polymer/OREC are
33%, 94%, 60% and 22%, respectively, which implies that the interaction within
the components is reversible and the intensity of interaction is ordered as
PC/LiClO4, PC/OREC, polymer/OREC and polymer/LiClO4.