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Killer satellites

23.08.2019

The potential military rivalry of world powers in space made Japan think about creating satellites that could destroy similar devices of other countries.

As early as the second half of 2020, Japan may launch killer satellites into orbit, the main function of which is to destroy other satellites in the event of a threat from them.

Currently, the Japan Self-Defense Forces have satellites in orbit that are only capable of collecting and transmitting information to Earth. At the same time, the country considers the scenario of a space confrontation and the preparation of combat satellites by Russia and China to be quite real, so the Japanese Ministry of Defense intends to prepare its own response to a potential threat.

In addition to killer satellites, Japan is working on creating electronic warfare equipment in space and protecting its satellites from similar technologies from other countries.

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The battery heals itself 22.11.2013

Scientists from Stanford University have developed the first electrode that has the property of self-healing. This can significantly extend the life of lithium-ion batteries for electric vehicles, smartphones and other devices. The secret lies in the coating of the electrode with an elastic polymer, which tightens microcracks in the electrode material that occur during battery operation.

"Self-healing plays a critical role in the survival and longevity of animals and plants," commented Chao Wang, a Stanford University researcher and co-lead of the project. "So we decided to provide this property to lithium-ion batteries so they can last longer. ".

Wang came up with the idea of ​​covering the electrode with an elastic polymer after meeting a team in a lab that is developing electronic skin for robots. He took the material used for this purpose as a basis, adding graphite nanoparticles to the polymer so that the material conducts an electric current.

“We found that the lifetime of the silicon electrodes increased 10 times after we coated them with the polymer we created,” Wang said, explaining that within a few hours, the polymer completely eliminates any microcracks in the thickness of the electrode.

Under laboratory conditions, the researchers were able to perform 100 battery recharge cycles without degrading its capacity. The goal is to achieve 500 cycles for a smartphone battery and 3 cycles for an electric car battery.

As the scientists explained, they took the silicon electrode because silicon is the most promising material for the manufacture of electrodes, since it contains a huge number of ions. However, this property has a downside - with each charge, the electrode increases in size by a maximum of 3 times, again decreasing to the nominal size when the battery is discharged. This process leads to a rapid destruction of the structure of the material and a drop in the properties of the battery.

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