Journal
SOLID STATE IONICS
Volume 268, Issue -, Pages 54-67Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2014.09.029
Keywords
Polymer blend; Molecular weight; Battery separator; Thermal degradation; Electrochemical techniques
Categories
Funding
- FEDER
- FCT - Fundacao para a Ciencia e a Tecnologia [PTDC/CTM/69316/2006, NANO/NMed-SD/0156/2007, Pest-C/QUI/UI0686/2011, SFRH/BD/82411/2011, SFRH/BD/68499/2010, SFRH/BD/66930/2009]
- Matepro - Optimizing Materials and Processes - Programa Operacional Regional do Norte [NORTE-07-0124-FEDER-000037]
- VI National RDi Plan
- Iniciativa Ingenio
- Consolider Program
- CIBER Actions
- Instituto de Salud Carlos III
- Quadro de Referencia Estrategico Nacional (QREN)
- Fundo Europeu de Desenvolvimento Regional (FEDER)
- Fundação para a Ciência e a Tecnologia [PEst-C/QUI/UI0686/2011, SFRH/BD/82411/2011, SFRH/BD/66930/2009] Funding Source: FCT
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Polymer blends based on poly(vinylidene fluoride-trifluoroethylene)/poly(ethylene oxide), P(VDF-TrFE)/PEO, with different PEO contents and molecular weights have been prepared for use as Li-ion battery separator membranes. The electrolyte uptake strongly depends on PEO content within the polymer blend. Thermal, mechanical and electrical properties of the membranes are dependent both on PEO content and molecular weight. A thermal degradation mechanism is also proposed as PEO content has a large influence on the activation energy and thermal degradation of P(VDF-TrFE). After electrolyte uptake, all polymer blends exhibit high ionic conductivity at room temperature, the highest value being 0.7 mS cm(-1) which was obtained for the 40/60 membrane with PEO with M-w = 10 kDa. From the point of view of lithium-ion battery application, polymer blends with 10 kDa molecular weight PEO are more adequate due to its excellent mechanical properties and high ionic conductivity. (C) 2014 Elsevier B.V. All rights reserved.
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