Date:17/01/17

Scientists created flame-resistant batteries

Exploding batteries in smartphones are not uncommon. Due to various factors, including high capacity in a compact size, lithium-ion battery occurs short circuit or overheating, therefore the liquid inside can evaporate and ignite. To solve this problem, scientists at Stanford University in California have invented a mini-fire extinguishers, batteries.
 
One way to avoid the explosion is to add flame retardant in the liquid inside the battery acting as the electrolyte. But in this case, the reduced conductivity of the electrolyte and the battery performance. Scientists from Stanford has offered to put a flame retardant in a special capsule made of polymer, which separates it from the electrolyte. In this case, retains all the properties of the battery, and in the case of overheating or fire sheath flame retardant melts, and he puts out the fire.
 
During the tests the flame retardant capsule very quickly melted in the burning electrolyte and immediately extinguished it. The whole process takes less than a half second. And most importantly, during testing of the developments in commercial batteries, their properties and performance does not suffer. However, scientists have discovered that after 360 cycles of discharging and charging a small amount of flame retardant still permeates through the capsule wall into the electrolyte, which eventually reduces the performance of the battery. Now researchers are working on a solution to this problem.
 
One of the areas where this technology can be electric cars, because they use large batteries to overheat which can lead to a fatal outcome. Experts say that for use in vehicles such capsules must remain in working condition for 10 or 20 years.

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