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Magnet and superwire

16.02.2016

Not all superconductivity can be destroyed by a magnetic field.

The magnetic field is pushed out of the superconductor - the corresponding kind of magnetic levitation is based on this phenomenon. However, a strong field penetrates the superconductor, creating eddy currents in it, the so-called Abrikosov vortices, for the discovery of which the former Soviet scientist who moved to the United States received the Nobel Prize in 2003. Vortices destroy electron pairs, and the magnetic field is the second limit to the use of superconducting materials; the first is too much current.

However, time passes, and new superconductors appear. In particular, superconductivity was found in molybdenum disulfide quite recently: in 2012, the Japanese achieved the effect on a thin layer of this substance, and in March 2015, the Chinese did it on a bulk sample, but at high pressure, the transition temperature turned out to be slightly more than 11K. Usually, MoS2 is used as a solid lubricant component: like graphite, it is easily separated into monatomic layers. It was on such a two-dimensional object that an international group of researchers conducted experiments in Nijmegen. Why there? But because the Nijmegen High Magnetic Field Laboratory has unique facilities with extremely strong magnets; it was here in the 90s that Andrey Geim, the future Nobel laureate for the discovery of graphene, carried out the famous frog levitation due to the diamagnetism inherent in all living beings.

The most powerful field, 37,5 Tesla, was applied to a plate of disulfide in a superconducting state. The superconductivity in the sample did not disappear. Moreover, there is an opinion that even one kilotesla is unimportant to him. It is hardly possible to check this - we still do not know how to create such strong fields. In any case, now it is necessary to explain what kind of force keeps electron pairs from the destructive action of a strong field. It is possible that the explanations will help to find fundamentally new materials.

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Recycled battery 22.11.2021

Swedish company Northvolt has produced the first battery using 100% recycled nickel, cobalt and manganese.

A lithium-ion battery made from recycled metals was produced under a program called Revolt. Nickel, manganese and cobalt were obtained from the recycling of decommissioned batteries. The test results showed that the performance of such a battery is on par with the performance of batteries made from mined metals.

Northvolt also announced the construction of a recycling plant called Revolt Ett, which will begin in the first quarter of 2022. The plant will be put into operation in 2023.

As a result of the expansion of the recycling line, the company will be able to recycle 125 thousand tons of decommissioned batteries annually.

In addition to lithium, cobalt, manganese and nickel, the plant will also be able to process plastic, copper and aluminum and then return it to the production of final products, the report said.

Northvolt, founded in 2016 and headquartered in Stockholm, manufactures lithium-ion batteries for electric vehicles. Among its major investors are such companies as the American bank Goldman Sachs Group and the German automotive concern Volkswagen.

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