The blog post via: Researchers use neutrons for battery optimization
Researchers use neutrons for battery optimization
Materials: With neutron scientists are looking at the research reactor FRM II in Garching during charge and discharge into the interior of a battery cell without opening them. Because if you know how the metals and chlorides are distributed inside and change, can be efficiency and lifetime of a battery cell, a positive way. VDI nachrichten, Munich, 12 2. 10, Si
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Those who previously wanted to study a rechargeable battery, had to cut their case circumstantially. This content may not change following the sudden penetrating moisture and air. Neutrons, however, it allow non-destructive to look into the interior of a battery. At the two instruments Stress-Spec and Antares the research neutron source (FRM II), TU Munich, scientists analyzed why a battery cell in the U.S. technology company General Electric (GE), Fairfield, Connecticut, without opening the cell.
The sodium-nickel chloride battery once to come in a hybrid locomotive, GE Transportation is used, which is powered by a diesel engine and batteries. The high temperature cells are operated at a working temperature of about 300 º C and recharged during deceleration of the locomotive. The output voltage is 2.58 V per cell, the energy density is 100 Wh / kg and 120 Wh / kg. Ideally, the technology group expects around 10% less emissions than a diesel-only engine.
GE scientists were at the FRM II, and an unloaded half discharged battery cell to investigate the charge and discharge process. On Anatares instrument (Advanced Neutron Tomography and Radiography Experimental System) took the physics and chemistry using the neutrons that pass through the battery casing, a radiography of the interior of the cell. It was false, with the level of sodium in the battery profile, which reacts during the discharge of sodium chloride. The less sodium in the battery, the more draining it is.
On residual stress and texture diffractometer Stress-Spec investigated the Munich scientists at the neutron content of the battery prototype from GE. Here they took advantage of the different reaction of the materials in the battery with neutrons to determine which chemical substances in the cell are distributed in what density. That, say experts, is important to know how the battery cell, as often false and can be unloaded.
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The result confirmed the expectations of Munich researchers: The concentration of the metal as an important reactant loading in the battery is high on the sides and falls off toward the middle, as with their measurements on the stress-Spec noted.
GE now plans to cooperate with the scientists of the FRM II, the first time to observe a battery during charge and discharge process with neutrons. Thus one could watch the process of how to change the distribution of substances inside the discharge over time, and soon develop batteries that supply an engine as long as possible with the necessary electrical energy. JÜRGEN Siebenlist
Non-destructive testing of industrial components
A To “Non-destructive testing of industrial components – from ultrasound to the Neutron” is on 13 April at the VDI-Experts Forum at the research reactor FRM II, the Technical University of Munich. Scientists and industry representatives report here about their experiences with various methods of testing. After a subsequent tour of the neutron that participants in the expert forum VDI learn more about neutrons and their application. Registrations are up to 26 March habil possible via fax (089 / 289-14995) or by e-mail to Dr.. Ralph Gilles.
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