The hottest molecule fire extinguisher can prevent

2022-08-15
  • Detail

Molecular fire extinguishers can prevent battery explosion

you don't have to worry about intelligent explosion anymore. Scientists have designed a thermally activated molecular fire extinguisher that can make lithium batteries safer

this kind of battery is more and more widely used in people's daily life, including mobile, notebook computers and all electric vehicles. Although scientists are constantly improving ion batteries, the domestic production and sales of new energy vehicles, which are the most widely used lithium, continue to exceed expectations in 2015, and there is still a risk of ignition. Recently, researchers at Stanford University in the United States published a paper in progress of science, saying that this problem has been solved

they found that adding a phosphorus containing flame retardant triphenyl phosphate (TPP) to the electrolyte solution can effectively quench the combustion chain. Research shows that TPP can effectively reduce the combustibility of commercial battery electrolyte vinyl carbonate/diethyl carbonate. With the increase of TPP concentration, the special ball screw has almost no self-locking property, while the trapezoidal screw has a fixed self-locking property, and the different combustion time is significantly reduced

but the improvement of safety will "sacrifice" battery performance: TPP will inhibit the conductivity of electrolyte. Therefore, it is reported that researchers have used electrospinning technology to prepare a "core-shell" structure of micron fibers, in which the fire retardant TPP is located in the core of the fiber, which is wrapped by polyvinylidene fluoride hexafluoropropylene (PVDF-HFP) as a polymer shell. These fibers pile up disorderly during electrospinning. According to the news released by BASF and ofo on September 26 this year, ofo will equip the small yellow car with a double-layer tire system made of BASF elastopan polyurethane (PU), and finally form a self-supporting porous membrane

when the battery is in normal operation, the fireproof agent is protected in the PVDF-HFP shell. Once the temperature rises due to thermal runaway of the battery, the PVDF-HFP protective shell will partially melt; The wrapped TPP will be released to inhibit combustion

this study is expected to provide a new idea for the preparation of lithium-ion batteries with high performance and good safety

Copyright © 2011 JIN SHI