The main problem of new generation lithium batteries has been solved. Free Technical Library News

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The main problem of new generation lithium batteries is solved

07.11.2016

Researchers from the University of Cambridge, along with employees of the Beijing Institute of Technology, have developed a new generation of lithium-sulfur batteries.

The principle of operation of the battery resembles the functioning of the human small intestine.

In the new development, scientists managed to overcome the main problem of lithium-sulfur batteries, which was the gradual loss of their capacity. So, the sulfur-containing cathode is separated from the electrolyte by a special membrane, which in structure resembles the fibers found in the small intestine.

Like the walls of the small intestine, this layer of zinc oxide fibers is able to trap fragments of the active substance and attach them to the conductive lattice. This allows the battery materials that have been degraded to be reused.

Study author Deng Zhao claims that the specific energy of a lithium-sulfur battery is five times that of a lithium-ion battery, which is used in most portable devices. However, he added that the battery is not yet able to go through a large number of charge-discharge cycles.

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Compact tokamak warmed up to a record 100 million kelvins 27.05.2023

Researchers from the British company Tokamak Energy Ltd, Oak Ridge National Laboratory (USA), and the Institute for Energy and Climate Research (Germany) have set a plasma temperature record for a spherical tokamak.

The ST40 is compact: the size of the working chamber is no more than 80 centimeters in diameter. The ions inside the reactor were heated to over 100 million kelvins (about 100 million degrees Celsius, or 8,6 kiloelectronvolts).

"An ion temperature of over five kiloelectronvolts has never been achieved before in any spherical tokamak. They were obtained only in much larger devices with a much higher plasma heating power," the scientists explained. Their work has been published in the journal Nuclear Fusion.

Note that for small spherical tokamaks, reaching such temperatures is a very difficult task. Therefore, the fact that this was achieved on a commercial spheromak looks like a good achievement for the British.

At the same time, against the background of the most productive modern thermonuclear reactors, this indicator is not high, and the energy efficiency of the British spheromak is quite moderate.

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