Lithium titanate nanotubes as active fillers for lithium-ion polyacrylonitrile solid polymer electrolytes
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We report the effect of lithium titanate nanotubes (LiTNT) as active fillers for lithium-ion solid polymer electrolytes for lithium batteries. The interaction of LiTNT with polyacrylonitrile host material and enhancement on lithium perchlorate ionic-pair dissociation was clearly evidenced by our vibrational spectroscopy and confocal Raman microscopy studies. In strong correlation with the structural characterization, the active role of LiTNT fillers was evidenced by means of impedance spectroscopy analysis revealing the presence of two contributions to the ionic transport, one due to the bulk and the other possibly mediated by the LiTNT surface in the nanocomposites. A four-order-magnitude enhancement on the lithium-ion bulk conductivity was observed for 15% LiTNT loadings with respect to unloaded samples showing an increment up to ~ 7.1 × 10−4 S.cm−1. In addition, we also evidence that the LiTNT surface-mediated contribution to the lithium-ion transport yielded conductivities in the same order of magnitude.
KeywordsLithium titanate nanotubes Active filler Lithium-ion Polymer electrolyte
The authors thank the Uruguayan CSIC, ANII, and PEDECIBA funding institutions. We would like to thank Alvaro Olivera for the technical support and the collaboration of Laura Fornaro at GDMEA-CURE high-resolution transmission electron microscopy laboratory.
We also are thankful for financial support of EQC-X-2012-1-14 ANII.
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