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Transparent flexible lithium ion conducting solid polymer electrolyte
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DOI：10.1039/c7ta02182h.png)
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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 similar to 0.03 mS cm(-1)) is demonstrated and this SE is endowed with other exotic properties such as high Li-ion transport number (similar to 0.69) with large electrochemical window (2-5 V), high mechanical robustness and flexibility (Young's modulus similar to 1 MPa), visible light transparency (similar to 85%), and hydrophobicity (contact angle > 100 degrees). 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.
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3.3W
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21.7W
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