Oxide pyrochlores — A review

Fast Lithium Ion Conduction in Garnet‐Type Li7La3Zr2O12

Fast Na+-ion transport in skeleton structures

This Review is focused on ion-transport mechanisms and fundamental properties of solid-state electrolytes to be used in electrochemical energy-storage systems. Properties of the migrating species significantly affecting diffusion, including the valency and ionic radius, are discussed. The natures of the ligand and metal composing the skeleton of the host framework are analyzed and shown to have large impacts on the performance of solid-state electrolytes. A comprehensive identification of the candidate migrating species and structures is carried out. Not only the bulk properties of the conductors are explored, but the concept of tuning the conductivity through interfacial effects—specifically controlling grain boundaries and strain at the interfaces—is introduced. High-frequency dielectric constants and frequencies of low-energy optical phonons are shown as examples of properties that correlate with activation energy across many classes of ionic conductors. Experimental studies and theoretical results are...

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Inorganic Solid-State Electrolytes for Lithium Batteries: Mechanisms and Properties Governing Ion Conduction

New two-dimensional niobium and vanadium carbides have been synthesized by selective etching, at room temperature, of Al from Nb2AlC and V2AlC, respectively. These new matrials are promising electrode materials for Li-ion batteries, demonstrating good capability to handle high charge–discharge rates. Reversible capacities of 170 and 260 mA·h·g–1 at 1 C, and 110 and 125 mA·h·g–1 at 10 C were obtained for Nb2C and V2C-based electrodes, respectively.

New Two-Dimensional Niobium and Vanadium Carbides as Promising Materials for Li-Ion Batteries

Mechanism of ionic conduction and electrochemical intercalation of lithium into the perovskite lanthanum lithium titanate

Structural and Microstructural Studies of the Series La2/3−xLi3x□1/3−2xTiO3

Lithium-7 NMR and ionic conductivity studies of lanthanum lithium titanate electrolytes

Anomalies in Li+ ion dynamics observed by impedance spectroscopy and 7Li NMR in the perovskite fast ion conductor (Li3xLa2/3-x□1/3-2x)TiO3

The use of the high lithium-conductive perovskite compound Li 3 x La 2/3− x □ 1/3−2 x TiO 3 (LLTO) for the detection of ionic species in aqueous solution is investigated. A linear response in different pH-buffers is obtained with two configurations of the sensors. The membrane configuration proves the ability of this perovskite to detect the variation of pH between 2 and 10. The response is not Nernstian but the sensitivity and the response time are good. “all solid state” configuration is tested as pH sensor in various experiments. This sensor can be used in industrial processes like milk fermentation, in situ control of cleaning of fermentors (cleaning in place), yoghurt fabrication and waste water treatments for examples. The sensor is not sensitive to the variations of the redox potential of the solutions. A chemical stability of the ceramic at high temperature (up to 1000 °C) and high pressure and a good mechanical resistance make these ceramics valuable for the use as sensitive materials in industrial pH sensors.

Jean-Louis Fourquet

Papers

Mechanism of ionic conduction and electrochemical intercalation of lithium into the perovskite lanthanum lithium titanate

Structural and Microstructural Studies of the Series La2/3−xLi3x□1/3−2xTiO3

Lithium-7 NMR and ionic conductivity studies of lanthanum lithium titanate electrolytes

Anomalies in Li+ ion dynamics observed by impedance spectroscopy and 7Li NMR in the perovskite fast ion conductor (Li3xLa2/3-x□1/3-2x)TiO3

pH sensors with lithium lanthanum titanate sensitive material: applications in food industry