Thermoplastic and solid-like electrolytes with liquid-like ionic conductivity based on poly(ethylene oxide) nanocomposites

被引：16
作者：
Mejia, Alberto [1 ]
Garcia, Nuria [1 ]
Guzman, Julio [1 ]
Tiemblo, Pilar [1 ]
机构：
[1] CSIC, ICTP, Madrid 28006, Spain
来源：
SOLID STATE IONICS | 2014年 / 261卷
关键词：
Poly(ethylene oxide); Nanofibre; Electrolyte; Thermoplastic; Solid-like; COMPOSITE POLYMER ELECTROLYTES; ELECTROCHEMICAL PROPERTIES; RECHARGEABLE BATTERIES; RHEOLOGICAL PROPERTIES; THERMAL-PROPERTIES; LITHIUM BATTERIES; PEO; MORPHOLOGY; TRIFLATE; BEHAVIOR;
D O I：
10.1016/j.ssi.2014.03.032
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：
A series of poly(ethylene oxide) (PEO)/lithium trifluoromethanesulfonate (LiTf)/ethylene carbonate (EC)/sepiolite composite electrolytes have been prepared by melt compounding, using neat sepiolite (Sep), sepiolite coated with polyethylene glycol (PEG-Sep) and with D-alpha-tocopherol polyethylene glycol 1000 succinate (TPGS-Sep) as fillers. The composites (weight ratio EC:PEO similar to 1) present ionic conductivity close to 10(-3) S cm(-1) at 30 degrees C, i.e. close to liquid electrolytes. Their crystallization and viscoelasticity were investigated evidencing a very complex phase structure and rheological behaviour, both of which dramatically depend on the type of nanofiller introduced in the blend. In the absence of TPGS-Sep as filler, the composites slowly separate into EC-rich and PEO-rich macrophases, what is visually evident in a two month time scale. With TPGS-Sep, the electrolytes are solid-like even at temperatures well above the PEO melting temperature range and do not phase separate in at least two years, constituting a homogeneous and stable blend which keeps its properties for long time periods. (C) 2014 Elsevier B.V. All rights reserved.
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页码：74 / 80
页数：7
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