When it is summer we often notice an abnormal overheating (but not so much) of the smartphone batteries. OnePlus 9, among others, seems to suffer more than many others but also Xiaomi mi 11 ultra he didn't joke. However, it must be recognized that even the cold, no matter what they say, is not good for the charging cells of our mobile devices. So here is that the Purdue University has found a solution for protect batteries from extreme temperatures.
In the summer, smartphone batteries fear the heat, but in winter? Cold is said to be good for you, but that's not really the case! Here's how their life can be safeguarded
Purdue University researchers have developed another way to use graphene to protect batteries from hypothermia, as well as from overheating. For this purpose, the scientists synthesized the graphene foam. With its help, an artificial “thermal switch” was created, which has already proven its effectiveness in real tests.
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Lithium-ion battery manufacturers recommend use them at temperatures between 0 ° and 45 ° C. In other temperature conditions, capacity is lost too quickly and the batteries are discharged. In addition, smartphone companies need to think carefully about the placement of electronic components in order to do not cause the batteries to overheat.
The co-author of the study Xiuli Ruan described how they managed to solve the problem of extreme temperatures using graphene foam. The graphene itself looks like an atom-thick sheet of carbon and is well known to physicists as a material capable of transferring heat well. But during the formation of the graphene foam, air pockets appear between its sheets which, in addition to thermal conductivity, add another useful property: high thermal insulation.
Purdue University scientists managed to create a versatile material capable of both retaining heat around the battery at low temperatures, acting as a heater, is to remove excess heat, preventing overheating at high temperatures. During the tests, the researchers squeezed and stretched the foam in such a way that the thickness of the makeshift layer varied from 0.2 to 1.2 mm.
Graphene foam works like a resistor in an electrical circuit. Depending on the density, the amount of heat flowing changes in the same way that a resistor changes the number of electrons in a circuit.
Amy Marconnett, author of the study
Scientists tested the behavior of graphene foam in temperatures from 0 ° to 32 °. Potentially, graphene foam could be useful for wearable electronic devices, portable gadgets and smartphone.
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