Probably a solution to a serious issue.
A paper has been published by nine researchers of Stanford University that reveals creation of a lithium-ion battery with built-in flame extinguisher.
An integrated flame extinguisher automatically releases when the battery’s temperature reaches a critical level of 160 degrees Celsius, flaming out the fire within 0.4 seconds.
Most importantly, the integration of retardant in the chemical composition of the battery does not impact the battery’s performance.
An urgent need for such a research was needed when the battery of Galaxy Note 7 exploded on numerous occasions. Actually, the battery contains some highly flammable chemical reaction that converts into fire followed by an explosion when heat surpasses a certain level.
As a remedy, the scientists used a separator, in the form of semi-permeable membrane, between the negative and positive poles of the battery that contained flame retardant/extinguisher.
The separator consists of fibrous threads of triphenyl phosphate (TPP) with a shell of another polymer (PVDF-HFP). The polymer shell ensures that the TPP does not seeped into the electrolyte, as it would negatively affect the battery’s life and performance. So, when the separator hits 160 temperature, the polymer melts, resultantly allowing TTP to release into the electrolyte and flam out the fire.
The researchers are confident that further experiments on the phenomenon will bring more positive results. So far they have conducted the test on a coin cell whose results cannot be generalised to larger cells, which are more difficult to handle.
This research might give a clear direction to on-going investigation into exploding Galaxy Note 7.