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Aluminum foam in battery

14.10.2011

In conventional lithium-ion batteries, the positive electrode is aluminum foil. Specialists of the Japanese company "Sumitomo-Electric" intend to replace the foil with a solid "foam" made of aluminum.

A large reaction surface will increase the capacity of the batteries by one and a half to three times, and the range of travel on an electric car from one charge will also increase by the same amount. So, the Tesla Roadster model on new batteries instead of 352 kilometers will be able to drive more than 1150, which is quite comparable with a gasoline car. Or, if you are satisfied with the previous travel distance, you can reduce the battery capacity by one and a half to three times.

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Magnetoelectric effect of a symmetrical crystal 27.09.2020

Scientists have discovered a strange magnetoelectric effect in a symmetrical crystal. These two properties, magnetism and electricity, are related to each other in many strange and, according to scientists, surprising ways, and the magnetoelectric effect is one of them. It can be seen in some crystals. This is manifested in those cases when the electrical properties of the crystal act on the magnetic field and vice versa.

Another completely impossible way of interaction was unexpectedly discovered by science. A new magnetoelectric effect has been discovered in a symmetrical crystal. It was revealed in a crystal of a special type - in langasite.

This crystal is composed of lanthanum, gallium, silicon and oxygen, as well as holmium atoms. It has a symmetrical structure and was previously thought to eliminate the relationship between electricity and magnetism. Experts suggest that the relationship between the electrical and magnetic properties of crystals depends on the internal symmetry of the crystal.

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This means that polarization is possible if positive and negative charges are slightly shifted in the crystal. Now this method can be easily proved using an electromagnetic field, where the key point is the strength of the magnetic field itself. The crystal structure turned out to be so symmetrical that it cannot allow the expected effect.

But in practice, in the case of exposure to stronger rays of the magnetic field, something happened: the holmium atoms changed their quantum state and acquired a magnetic moment, thereby violating the internal symmetry of the crystal.

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