Pierre Lannelongue

• Ph. D
• PostDoc Position at CIC Energigune

Halides are potential electrolytes for Li metal solid state batteries owing to their combination of high ionic conductivity, ductility and electrochemical stability against oxidation. However, their reactivity with the Li metal electrode may result in the formation of secondary compounds hindering their practical utility in terms of cycling perform...

Two asymmetric aqueous electrochemical capacitors operated in 5 M LiNO3 are reported: C/Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) and FeWO4/BSCF, with activated carbon and FeWO4 (synthesized by a precipitation method) as negative electrodes, respectively, and BSCF (synthesized by a modified glycine-nitrate process) as positive electrodes. These two devices w...

BSCFs oxides have been prepared by sol-gel process followed by high temperature treatment. The resulting powders show the same perovskite structural arrangement as well as identical morphology characteristics. BSCFs electrodes were tested in 5M LiNO 3 aqueous electrolyte, and have demonstrated promising pseudocapacitive behavior while performances...

Supercapacitors are attractive electrochemical energy storage devices for high power applications. However, volumetric energy density is the main limitation for their integration in such applications as terrestrial transport systems. The use of high density pseudocapacitive oxides as electrode material could lead to a volumetric energy density impr...

Les supercondensateurs sont des dispositifs de stockage électrochimique de l’énergie très intéressants lorsque des pics de puissance sont mis en jeu. Toutefois, leur densité d’énergie volumique est la principale limite pour leur intégration, en particulier, dans des systèmes de transport terrestre. L’utilisation de matériaux d’électrode ayant un co...

The design and fabrication of high volumetric energy density supercapacitors lead to high density materials to be considered as electrode material [1]. So far, most of the studies have been carried out on mono-cationic oxides such as RuO 2 , MnO 2 or Fe 3 O 4 , while polycationic oxides, for which more than a single redox center are potentially inv...

Since the early use of RuO2-based electrodes in electrochemical capacitors, so called supercapacitors, metal oxides have always attracted much attention as pseudocapacitive electrode materials for such energy storage devices. Although the literature is well documented about electrode materials based on single metal oxides, polycationic oxides have...

We report here electrochemical capacitors using an aqueous electrolyte based on the concept of “water-in-salt” with the aim to improve the energy density by increasing the voltage of the cell. A “water-in-salt” consists of a highly concentrated aqueous LiTFSI solution in which both volume and mass of LiTFSI are greater than those of water. With act...

Ba0.5Sr0.5CoxFe1-xO3-d phases, with 0.75 < x < 0.90, so-called BSCFs, were investigated as pseudocapacitive electrode materials. These polycationic oxide phases were prepared by a modified glycine-nitrate process and show the same perovskite structural arrangement and similar morphological characteristics in the whole series. The electrochemical pe...

We report here electrochemical capacitors using an aqueous electrolyte based on the concept of “water-in-salt” with the aim to improve the energy density by increasing the voltage of the cell. A “water-in-salt” consists of a highly concentrated aqueous LiTFSI solution in which both volume and mass of LiTFSI are greater than those of water. With act...

Kinetics of electrochemical reactions are several orders of magnitude slower in solids than in liquids as a result of the much lower ion diffusivity. Yet, the solid state maximizes the density of redox species, which is at least two orders of magnitude lower in liquids because of solubility limitations. With regard to electrochemical energy storage...

Kinetics of electrochemical reactions are several orders of magnitude slower in solids than in liquids as a result of the much lower ion diffusivity. Yet, the solid state maximizes the density of redox species, which is at least two orders of magnitude lower in liquids because of solubility limitations. With regard to electrochemical energy storage...

The design and fabrication of high volumetric energy density supercapacitors lead to high density pseudocapacitive materials to be considered as electrode material. After our previous, and still on-going, work on FeWO 4 [1], Ba 0.5 Sr 0.5 Co x Fe 1-x O 3- δ phases, with 0.75<x<0.85, so-called BSCF, are currently under investigation. Our motivation...