Andreas Jossen

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The goal of the Robust Affordable Next Generation Energy Storage System (RANGE)-BASF program is to provide an alternative solution for the energy storage media that powers electric vehicles other than the existing Li-ion battery. With the use of a rare-earth-free metal hydride (MH) as the active negative electrode material, together with a core-shell type(More)
In this study we compared the electrochemical pressure-concentration-temperature (EPCT) method with the gaseous phase pressure-concentration-temperature (PCT) method and demonstrated the differences between the two. Experimentally, this was done by electrochemically charging/discharging the electrodes of four different metal hydride (MH) alloys. The results(More)
The microstructures of two metal hydride (MH) alloys, a Zr 7 , were studied using the electron backscatter diffraction (EBSD) technique. The first alloy was found to be composed of completely aligned Zr 7 Ni 10 grains with a ZrO 2 secondary phase randomly scattered throughout and a C15 secondary phase precipitated along the grain boundary. Two sets of(More)
The electrochemical reactions of multi-phase metal hydride (MH) alloys were studied using a series of Laves phase-related body-centered-cubic (BCC) and Nd) alloys. These alloys are composed of BCC (major), TiNi (major), C14 (minor), and Ti 2 Ni (minor) phases. The BCC phase was found to be responsible for the visible equilibrium pressure plateau between 0.1(More)
Effects of substitutions of rare earth (RE) elements (Y, La, Ce, and Nd) to the Zr-based AB 2 multi-phase metal hydride (MH) alloys on the structure, gaseous phase hydrogen storage (H-storage), and electrochemical properties were studied and compared. Solubilities of the RE atoms in the main Laves phases (C14 and C15) are very low, and therefore the main(More)
Online diagnostics for monitoring of battery cells in a battery pack is necessary in order to determine the state of the battery pack, like its age and safe operation. It could also provide the possibility to adjust the operation strategy of the battery management system and the load to increase the battery lifetime and safety. Impedance spectroscopy is a(More)
Compositions of MgNi-based amorphous-monocrystalline thin films produced by radio frequency (RF) sputtering with a varying composition target have been optimized. The composition Mg 52 Ni 39 Co 3 Mn 6 is identified to possess the highest initial discharge capacity of 640 mAh·g −1 with a 50 mA·g −1 discharge current density. Reproduction in bulk form of Mg(More)
The grain boundaries of three Laves phase-related body-center-cubic (bcc) solid-solution, metal hydride (MH) alloys with different phase abundances were closely examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and more importantly, electron backscatter diffraction (EBSD) techniques. By using EBSD, we were able to(More)
Structure, gaseous phase hydrogen storage, and electrochemical properties of a series of TiVCrMn-based body-centered-cubic (BCC) alloys with different partial substitutions for Mn with covalent elements (B and Si), transition metals (Ni, Zr, Nb, and Mo), and rare earth element (La) were investigated. Although the influences from substitutions on structure(More)
The effect of calendar aging on the thermal safety of 4.6 Ah pouch cells with a LiMn 2 O 4 (LMO) cathode was investigated by a battery test calorimeter (BTC) that can be used to determine the heat evolved during an uncontrolled exothermic runaway reaction. Cells were stored at 55 ˝ C and 100% state of charge (SOC) for accelerated aging, and they were taken(More)