Developed molecular extinguishers for Smartphone
After the story with numerous spontaneously flammable PHABLET Samsung Galaxy Note 7 and the subsequent recall of the market, many manufacturers of smartphones are thinking: how can we protect our users and ourselves from similar situations in the future? The answer to this question was found by scientists from Stanford University. They offered initially to supply lithium-ion battery built-in system that can instantly put out a fire started and to avoid a possible explosion.
The researchers sifted through a lot of options for the implementation of their ideas. The introduction of Li-Ion batteries are flame retardant substances inevitably would reduce the ability of conducting electrochemical cells, so this approach had to be rejected at once. Then scientists came up with a brilliant idea: if the flame retardant material to isolate the contents of the cell, battery performance deterioration can be avoided. Only need to conclude the molecules of the substance in the polymeric capsule shell which breaks only at high temperature. Once the battery is close to the explosion of the capsule shell is destroyed and contained therein a flame retardant material will extinguish source of fire. In studies, scientists have used as a "fire extinguisher" triphenyl coated with a shell of polymer PVDF-HFP. Since the artificially created overheating the battery to a full stop of ignition was not more than a second. In this case, the battery performance is not diminished. But before scientists should another serious problem: the durability of flame retardant capsules leaves much to be desired. After 360 charge cycles the polymer shell of some capsules is destroyed and reduces the efficiency of the battery life.