Composite solid polymer electrolytes with silicate nanophases

被引:11
作者
Bronstein, LM
Karlinsey, RL
Stein, B
Zwanziger, JW
机构
[1] Indiana Univ, Dept Chem, Bloomington, IN 47405 USA
[2] Indiana Univ, Dept Biol, Bloomington, IN 47405 USA
[3] Dalhousie Univ, Dept Chem, Halifax, NS B3H 4J3, Canada
[4] Dalhousie Univ, Mat Res Inst, Halifax, NS B3H 4J3, Canada
基金
美国国家航空航天局;
关键词
solid polymer electrolytes; composite; silicate organic-inorganic component; PEO;
D O I
10.1016/j.ssi.2004.09.002
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Composite solid polymer electrolytes (SPEs), consisting of an organic-inorganic component (OIC) formed in situ within a salt-in-poly(ethylene oxide) material, were synthesized and studied using transmission electron microscopy (TEM), H-1 and C-13 solid state NMR, differential scanning calorimetry (DSC), and impedance spectroscopy. The OIC was formed by sol-gel reaction of two main precursors: (3-glycidylopropyl)trimethoxysilane (GLYMO) and tetramethoxysilane. For 600 Da poly(ethylene glycol) (PEG) as the polymer component, this resulted in homogeneous materials with small and regularly shaped OIC particles dispersed within the polymer component, however glycidyl groups of GLYMO remained unchanged that might jeopardize chemical stability of the SPE in a Li battery. As we reported in our preceding papers, when OIC is made from GLYMO and aluminum(tri-sec-butoxide) (AB), glycidyl groups are reacted. To make these groups react, we added catalytic amounts of aluminum(tri-sec-butoxide) (AB). Incorporation of 0.65 mol% AB yields even smaller OIC nanoparticles and complete disappearance of the GLYMO glycidyl groups. This OIC composition resulted in stable and homogeneous SPE films with satisfactory conductivity (over 10(-5) S/cm at room temperature) and no film thickness dependence of the SPE properties. When 100 kDa poly(ethylene oxide) (PEO) is used as the polymer component of the SPE, incorporation of AB in OIC up to 3.1 mol% still results in incomplete polymerization of glycidyl groups, while OIC particles are much larger and irregularly shaped in comparison to the 600 Da PEG based SPEs. This leads to film thickness dependence of the conductivity, suggesting that larger and more irregularly shaped particles can cause inhomogeneity of the film properties. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:559 / 570
页数:12
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