Structure and Mobility of PEO/LiClO4 Solid Polymer Electrolytes Filled with Al2O3 Nanoparticles

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• 作者：Susan K. Fullerton-Shirey ; Janna K. Maranas
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：May 27, 2010
• 年：2010
• 卷：114
• 期：20
• 页码：9196-9206
• 全文大小：550K
• 年卷期：v.114,no.20(May 27, 2010)
• ISSN：1932-7455

文摘

The mechanism for improved ionic conductivity in nanoparticle-filled solid polymer electrolytes containing polyethylene oxide [PEO], LiClO₄, and Al₂O₃ is investigated using differential scanning calorimetry [DSC], dielectric spectroscopy, small-angle neutron scattering [SANS], and quasi-elastic neutron scattering [QENS]. We measure samples with ether oxygen to lithium ratios ranging from 14:1 to 8:1 and Al₂O₃ nanoparticle concentrations ranging from 5 to 25 wt %. The T_g and pure PEO crystal fraction are unaffected by nanoparticle addition, and SANS reveals nanoparticle aggregation, with the extent of aggregation similar in all samples regardless of LiClO₄ or Al₂O₃ concentration. Despite the similarity between samples, nanoparticles improve conductivity at all temperatures, but only at the eutectic concentration (ether oxygen to lithium ratio of 10:1). Our QENS results indicate that a rotation is present in both filled and unfilled samples at all concentrations and is consistent with the rotation of (PEO)₆:LiClO₄, a channel-like structure that is more conductive than the amorphous equivalent. The rotation becomes more restricted in the presence of nanoparticles.