The lithium battery has a mini extinguisher


still worried that your phone will explode? A mobile phone mini fire extinguisher freshly baked, it allows the phone to automatically shut down after overheating. According to the "New Scientist" magazine website recently reported that the Stanford University Cui Yi team in the latest design of a lithium battery, the people familiar with the flame retardant PPT (i.e. three phosphoric acid phenyl ester) with ultrathin polymer sealing material into capsules, the separating device placed between the anode and the electrolyte but only isolated, heated to a certain temperature. Capsule shell polymer melt, flame retardant will be released into the electrolyte, which can prevent the battery explosion, and will not reduce its performance.

lithium batteries are widely used in mobile phones, laptops and other mobile devices due to the ultra light, efficient and other properties, but it contains volatile components of spontaneous combustion, the use of a long time after the explosion risk of overheating. In order to solve the problem of "thermal runaway", scientists have tried to install the alarm for lithium batteries or to prevent the short circuit of the chemical composition, but it will reduce the conductivity of electrolyte.

Cui Yi team published the latest progress in the design of "science" magazine, the normal work of the battery when the flame retardant "house" in the plastic fiber capsule, when the temperature rose to 150 degrees after the capsule shell melts, emergency fire retardant". The experiments show that when the capsule is placed in a burning battery solution, they can quickly melt in less than half a second (0.4 seconds) and the release of flame retardant successfully extinguishing. The results showed that the electrochemical performance of the battery was not reduced after the capsule was implanted into the commercial lithium battery.

Cui Yi said that if the laboratory performance of this capsule can be verified in practical application, and can be reliably used in lithium batteries for electric cars and aircraft. However, some scientists questioned that the capsule fire extinguisher life is the key factor to be considered, and general electric vehicles must use 10 to 20 years to match the term. "We have conducted a related test, the capsule after repeated charging and discharging 360 times, only a small amount of flame retardants leaked into the electrolyte. As to how long the use of flame retardants will eventually affect the performance of the battery, further research is needed." Cui Yi said.