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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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Journal ArticleDOI
TL;DR: HRTEM studies show that the YSZ/Y(2)O(3) interfaces are semicoherent, and the correlation between interface structure and ionic conduction is discussed.
Abstract: The oxygen ion conductivity of YSZ (ZrO2 + 9.5 mol% Y2O3)/Y2O3 multilayer systems is measured parallel to the interfaces as a function of temperature between 350 and 700 °C. The multilayer samples are prepared by pulsed laser deposition (PLD). The film thicknesses, the crystallinity, the texture and the microstructure are investigated by SEM, XRD, HRTEM and SAED. To separate the interface contribution of the total conductivity from the bulk contribution the thickness of the YSZ and Y2O3 layers is varied systematically. The total conductivity of the YSZ films increases when their thickness is decreased from 0.53 μm to 24 nm. It depends linearly on the reciprocal thickness of the individual layers, thus on the number of YSZ/Y2O3 interfaces. This behaviour results from the parallel connection between individual conduction paths in the bulk and the interfacial regions. The activation energy for the ionic conductivity decreases from 1.13 to 0.99 kJ mol−1 by decreasing the thicknesses of the individual YSZ layers. HRTEM studies show that the YSZ/Y2O3 interfaces are semicoherent. The correlation between interface structure and ionic conduction is discussed.

194 citations

Journal ArticleDOI
TL;DR: In this article, a wide variety of ionic liquids were prepared by the neutralization of five kinds of imidazole derivatives and nine kinds of acids, and their physical and chemical properties such as melting points, glass transition temperature, viscosity, and ionic conductivity were studied.

194 citations

Journal ArticleDOI
TL;DR: In this article, Li ion conductivity in solid solutions formed between and has been measured as a function of temperature and composition using a • c technique, and the highest conductivities were found at 50 and 60 mole percent (m/o) phosphate.
Abstract: Lithium ion conductivity in solid solutions formed between and has been measured as a function of temperature and composition using a‐c techniques. Highest conductivities were found at 50 and 60 mole percent (m/o) phosphate. Empirical conductivity parameters are presented and qualitatively analyzed in terms of structural and compositional effects. Unit cell parameters have been determined across the entire range of solid solution by x‐ray powder diffraction.

192 citations

Journal ArticleDOI
18 May 2004-Langmuir
TL;DR: A solid polymer electrolyte film from hydrogen bonding layer-by-layer (LBL) assembly that outperforms previously reported LBL assembled films and approaches battery integration capability is reported.
Abstract: We report the development of a solid polymer electrolyte film from hydrogen bonding layer-by-layer (LBL) assembly that outperforms previously reported LBL assembled films and approaches battery integration capability. Films were fabricated by alternating deposition of poly(ethylene oxide) (PEO) and poly(acrylic acid) (PAA) layers from aqueous solutions. Film quality benefits from increasing PEO molecular weight even into the 10(6) range due to the intrinsically low PEO/PAA cross-link density. Assembly is disrupted at pH near the PAA ionization onset, and a potential mechanism for modulating PEO:PAA ratio within assembled films by manipulating pH is discussed. Ionic conductivity of 5 x 10(-5) S/cm is achievable after short exposure to 100% relative humidity (RH) for plasticization. Adding free ions by exposing PEO/ PAA films to lithium salt solutions enhanced conductivity to greater than 10(-5) S/cm at only 52% RH and tentatively greater than 10(-4) S/cm at 100% RH. The excellent stability of PEO/PAA films even when exposed to 1.0 M salt solutions led to an exploration of LBL assembly with added electrolyte present in the adsorption step. Fortuitously, the modulation of PEO/PAA assembly by ionic strength is analogous to that of electrostatic LBL assembly and can be attributed to electrolyte interactions with PEO and PAA. Dry ionic conductivity was enhanced in films assembled in the presence of salt as compared to films that were merely exposed to salt after assembly, implying different morphologies. These results reveal clear directions for the evolution of these promising solid polymer electrolytes into elements appropriate for electrochemical power storage and generation applications.

192 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,167
20222,073
20211,175
20201,117
20191,030
2018966