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Long-term structural stability of PMMA-based gel polymer electrolytes

TitoloLong-term structural stability of PMMA-based gel polymer electrolytes
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione1998
AutoriQuartarone, E., Tomasi C., Mustarelli P., Appetecchi Giovanni Battista, and Croce F.
RivistaElectrochimica Acta
Volume43
Paginazione1435-1439
ISSN00134686
Parole chiaveAnnealing, Crystal growth, Crystal structure, Dimethyl carbonate, Electric conductivity of solids, Electrochemical electrodes, Ethylene carbonate, Gel electrolytes, Gels, Lithium batteries, Lithium compounds, Lithium triflate, Polyelectrolytes, Polymethyl methacrylates, Reaction kinetics, Structural stability
Abstract

Gel-based SPEs are promising candidates as polymer electrolytes in electrochemical devices such as Li-ion batteries. In particular, PMMA-based gel electrolytes have shown electrical conductivity at room temperature as high as 10-3 Scm-1. One of the most important drawbacks of these gels is their lack of long-term structural stability, which determines a reduction of the contact area with the electrode and causes drops in conductance. We have observed macroscopic volume reductions (> 5%) in gels made of PMMA, ethylene carbonate (EC), dimethyl carbonate (DMC) and LiN(CF3SO2)2. The timescale of this phenomenon depends on the ratio EC/DMC. In this paper we investigate the structural modifications induced in the above mentioned system by annealing for several months at room temperature. We show that a crystalline phase grows in a matter of weeks with a kinetics controlled by the ratio EC/DMC and disappears for longer annealings. © 1998 Published by Elsevier Science Ltd. All rights reserved.

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Citation KeyQuartarone19981435