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Shear thickening electrolyte developed abroad can improve the safety of 1.5v Dry Battery
Shear thickening electrolytes developed abroad can improve the safety of 1.5v Dry Battery - although electric vehicles are very advanced, their power source is a fatal weakness. One of the commonly used battery types in electric vehicles is 1.5v Dry Battery. However, collisions or other impacts to the car can cause 1.5v Dry Battery to catch fire or explode. The impact can cause internal short circuits in the electrodes, resulting in "thermal runaway" and small fires. Will spread to the entire battery and other parts of the car.
As advanced as electric vehicles are, their source of power is an Achilles' heel. One of the commonly used battery types in electric vehicles is 1.5v Dry Battery. However, collisions or other impacts to the car can cause 1.5v Dry Battery to catch fire or explode. The impact can cause internal short circuits in the electrodes, resulting in "thermal runaway" and small fires. Will spread to the entire battery and other parts of the car.
Dr. Yu Zhu, associate professor of polymer science at the University of Akron, said: "Although everyone has made great efforts in battery thermal management, recent accidents of electric vehicle battery fires and explosions still make the public very worried. In most cases , the battery will catch fire only if it is subject to abnormal conditions such as external impact or impact. "
Dr. Zhu worked with a team of graduate students in polymer science and polymer engineering to improve the safety of 1.5v Dry Battery by creating a "shear thickening" electrolyte - a substance that becomes thicker under impact. . The electrolyte is placed between the anode and cathode, making the anode and cathode resistant to impact, so that any impact accident will not cause the battery to catch fire or explode. Under normal circumstances, the new electrolyte remains soft.
Dr. Zhu said: "The anode and cathode of 1.5v Dry Battery in electric vehicles are separated by a very soft membrane and a liquid electrolyte. Replacing only the liquid electrolyte with a solid electrolyte is still a very challenging task because these two Electrolytes are all porous structures and require liquid to fill the pores. Therefore, under normal circumstances, we still use a liquid-like electrolyte, but in the event of impact, the liquid electrolyte can enhance its mechanical strength. Therefore, we developed a shear-increasing electrolyte. Thick electrolytes.”
Think of this electrolyte as a mixture of water and flour. When you slowly mix the flour and water with your hands, you will feel a slight resistance. However, if you speed up the stirring speed, you will obviously feel a lot of resistance. In fact, a bowling ball can bounce off a surface of water and flour that behaves like a solid when struck.
A liquid with this characteristic is called a dilatant and is a non-Newtonian fluid. If the electrolyte is also an expander, it can prevent the battery from short-circuiting when the battery is subjected to external shocks. However, making shear-thickening electrolytes is much more difficult than mixing flour and water because electrolytes are complex and contain different ions, solvents, and various additives.
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