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Transparent flexible lithium ion conducting solid polymer electrolyte

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Abstract

Recent safety threats concerning conventional liquid electrolyte-based Li-ion batteries invoke the search for high ionic conductivity solid electrolytes (SEs) for solid state batteries. Here, the development of a multifunctional polymer SE (ionic conductivity ∼0.03 mS cm−1) is demonstrated and this SE is endowed with other exotic properties such as high Li-ion transport number (∼0.69) with large electrochemical window (2–5 V), high mechanical robustness and flexibility (Young's modulus ∼1 MPa), visible light transparency (∼85%), and hydrophobicity (contact angle > 100°). Here poly(ethylene oxide) (PEO) and polydimethylsiloxane (PDMS) based polymer complex serves as the Li-ion transport membrane, and lithium perchlorate (LiClO4) as the Li source. The ‘salting in’ phenomenon, induced by the ClO4–PEO interactions, modifies the crystalline melting temperature of PEO leading to the amorphization of the PEO–PDMS matrix and hence to a high Li-ion conductivity by microstructure modifications. This transparent and flexible SE is shown for its applicability in flexible symmetric capacitors and Li-ion cells without the use of liquid electrolyte interfaces.

Graphical abstract: Transparent flexible lithium ion conducting solid polymer electrolyte

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Publication details

The article was received on 11 Mar 2017, accepted on 09 May 2017 and first published on 09 May 2017


Article type: Paper
DOI: 10.1039/C7TA02182H
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Transparent flexible lithium ion conducting solid polymer electrolyte

    A. B. Puthirath, S. Patra, S. Pal, M. M., A. Puthirath Balan, J. S. and N. Tharangattu N., J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA02182H

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