Topic
Ionic conductivity
About: Ionic conductivity is a research topic. Over the lifetime, 19412 publications have been published within this topic receiving 519167 citations.
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TL;DR: In this article, the authors used 7Li NMR spectroscopy to develop a better understanding of the conduction mechanism of polyvinyl alcohol (PVA) and LiCF3SO3.
122 citations
TL;DR: Structural analysis indicates that the highest ionic conductivity complex exhibits more amorphous nature, and output voltage and power performance has been compared for single fuel cell application, which manifests the present BPE holds promise application in electrochemical devices.
121 citations
TL;DR: In this paper, the effects of plasticizer ethylene carbonate (EC) on the AC impedance spectra and the ionic conductivity are reported, and the data obtained from impedance experiments can be explained using an equivalent circuit proposed.
121 citations
TL;DR: Preliminary tests using a LFP/DES/LTO (lithium titanate) full cell at room temperature clearly show that LiTFSI-based DES can be successfully introduced into LIBs.
Abstract: In this work, we present a study on the physical and electrochemical properties of three new Deep Eutectic Solvents (DESs) based on N-methylacetamide (MAc) and a lithium salt (LiX, with X = bis[(trifluoromethyl)sulfonyl]imide, TFSI; hexafluorophosphate, PF6; or nitrate, NO3). Based on DSC measurements, it appears that these systems are liquid at room temperature for a lithium salt mole fraction ranging from 0.10 to 0.35. The temperature dependences of the ionic conductivity and the viscosity of these DESs are correctly described by using the Vogel–Tammann–Fulcher (VTF) type fitting equation, due to the strong interactions between Li+, X− and MAc in solution. Furthermore, these electrolytes possess quite large electrochemical stability windows up to 4.7–5 V on Pt, and demonstrate also a passivating behavior toward the aluminum collector at room temperature. Based on these interesting electrochemical properties, these selected DESs can be classified as potential and promising electrolytes for lithium-ion batteries (LIBs). For this purpose, a test cell was then constructed and tested at 25 °C, 60 °C and 80 °C by using each selected DES as an electrolyte and LiFePO4 (LFP) material as a cathode. The results show a good compatibility between each DES and LFP electrode material. A capacity of up to 160 mA h g−1 with a good efficiency (99%) is observed in the DES based on the LiNO3 salt at 60 °C despite the presence of residual water in the electrolyte. Finally preliminary tests using a LFP/DES/LTO (lithium titanate) full cell at room temperature clearly show that LiTFSI-based DES can be successfully introduced into LIBs. Considering the beneficial properties, especially, the cost of these electrolytes, such introduction could represent an important contribution for the realization of safer and environmentally friendly LIBs.
121 citations
TL;DR: In this article, the characteristic properties of vitreous electrolytes are summarised for convenience under the three headings of continuity, variability and vulnerability, which cover respectively the tempe, stability and vulnerability.
Abstract: The characteristic properties of vitreous electrolytes are summarised for convenience under the three headings of ‘continuity’, ‘variability’ and ‘vulnerability’. These cover respectively the tempe...
121 citations