"Compared with the traditional liquid electrolyte, the shear thickening electrolyte will not significantly reduce the performance of lithium ion batteries," Zhu said. "In the process of impact, the shear-thickened electrolyte will immediately behave like a solid, and the shear-thickened electrolyte will produce greater force to resist external impact. This solution complements the external thermal management system of the battery pack, which is usually insufficient to cope with sudden effects.“

 

 

 

 

 

Zhu said that research on improving lithium-ion batteries is relatively new, especially for electric vehicles. He added that shear-thickened electrolytes could have other niche uses, such as bullet-proof energy storage devices.

 

 

 

One of the common types of batteries used in electric vehicles, lithium-ion batteries or lithium-ion batteries is prone to ignition or explosion due to collision or other major impacts imposed on vehicles. This effect will lead to short circuit inside the electrode. Small fires can spread through the battery and other parts of the car through "thermal runaway".

 

 

 

 

 

"Although great efforts have been made in the thermal management of batteries, the recent battery fires and explosions in electric vehicle accidents have aroused great public concern," said Dr. Yu Zhu, an associate professor of polymer science at the University. Akron (UA). "In most cases, the battery will not be ignited in normal use, such as through large external impact or impact."

 

 

 

 

 

Zhu and his graduate team at the UA School of Polymer Science and Polymer Engineering are working to improve the safety of lithium-ion batteries by manufacturing shear-thickening electrolytes, which can become thicker under impact between the anode and the anode of batteries. The cathode will be shock resistant, so it will not cause fire or explosion in case of collision. Under normal conditions, the new electrolyte remains soft.

 

 

 

 

 

The team's research was led by Dr. Zhu. Student Kewei Liu recently published an article in Power Magazine: "Shear Thickening Fluid Antishock Electrolyte for Safe Lithium Ion Batteries".

 

 

 

 

 

"In lithium-ion batteries for electric vehicles, cathodes and anodes are separated by very soft membranes and liquid electrolytes," Zhu said. "Simply replacing liquid electrolytes with solid counterparts remains a challenging task because both electrodes are porous and require liquid to fill the pores and contact them. Our idea is that you can still use liquid electrolytes under normal conditions, but this liquid can increase its mechanical strength under impact. Therefore, we developed a shear thickening electrolyte. "

 

 

 

 

 

Think of it as a mixture of starch and water. You can stick your hand in and mix the starch and water slowly, feeling very resistant at the same time. However, if you increase the stirring speed, you will feel much greater resistance. In fact, bowling balls can bounce off the surface of a mixture of corn starch and water and act like solids during impact.

 

 

 

 

 

A liquid with this property is called an expander, a non-Newtonian fluid. If the electrolyte is also an expansive agent, it will prevent the battery from short-circuiting under external shock. However, the formation of shear thickening electrolyte is much more difficult than that of mixed corn starch and water because the electrolyte is composed of different ions, solvents and additives.

 

 

 

 

 

"In our preliminary study," Zhu said, "we have demonstrated that modified low-cost glass fiber fillers can produce the shear thickening electrolyte we are looking for, which is compatible with commercial lithium-ion batteries and shows improved impact resistance. "

 

 

 

 

 

在電動車輛，鋰離子電池或鋰離子電池中使用的常見類型的電池之一易于由于碰撞或施加在車輛上的其他主要沖擊而著火或爆炸。這種影響會導(dǎo)致電極內(nèi)部短路。小火可以通過“熱失控”擴(kuò)散到整個(gè)電池和汽車的其他部分。

 

“雖然已經(jīng)對電池的熱管理做出了重大努力，但近期電動車事故中的電池火災(zāi)和爆炸引起了公眾的極大關(guān)注，”大學(xué)高分子科學(xué)副教授于竺博士說。阿克倫(UA)。“在大多數(shù)情況下，電池在正常使用情況下不會被點(diǎn)燃，例如通過大的外部沖擊或撞擊。”

 

朱和他在UA高分子科學(xué)與高分子工程學(xué)院的研究生團(tuán)隊(duì)正致力于通過制造剪切增稠電解質(zhì)來提高鋰離子電池的安全性-這種電解質(zhì)在電池的陽極和陽極之間會在沖擊下變厚。陰極將具有抗沖擊性，因此在發(fā)生碰撞時(shí)不會引起火災(zāi)或爆炸。在正常條件下，新型電解質(zhì)保持柔軟。

 

該小組的研究由朱博士領(lǐng)導(dǎo)。學(xué)生KeweiLiu最近在“電源雜志”上發(fā)表文章：“用于安全鋰離子電池的剪切增稠液抗沖擊電解液”。

 

“在用于電動汽車的鋰離子電池中，陰極和陽極被非常軟的膜和液體電解質(zhì)隔開，”朱說。“簡單地用固體對應(yīng)物替換液體電解質(zhì)仍然是一項(xiàng)具有挑戰(zhàn)性的任務(wù)，因?yàn)閮蓚€(gè)電極都是多孔的，它們需要液體來填充毛孔并接觸。我們的想法是你仍然可以在正常情況下使用液體狀電解質(zhì)，但是這種液體可以在沖擊下提高自身的機(jī)械強(qiáng)度。因此，我們開發(fā)了一種剪切增稠電解液。“

 

可以把它想象成淀粉和水的混合物。你可以把手伸進(jìn)去，慢慢攪拌淀粉和水，同時(shí)感覺抵抗力很小。但是，如果你提高攪拌速度，你將會大大感受到更大的阻力。實(shí)際上，保齡球可以從玉米淀粉和水混合物的表面反彈，在沖擊過程中表現(xiàn)得像固體。

 

具有這種性質(zhì)的液體稱為膨脹劑，一種非牛頓流體。如果電解質(zhì)也是膨脹劑，它將防止電池在外部沖擊下短路。然而，形成剪切增稠電解質(zhì)比混合玉米淀粉和水困難得多，因?yàn)殡娊赓|(zhì)的組成復(fù)雜，由不同的離子，溶劑和各種添加劑組成。

 

“在我們的初步研究中，”朱說，“我們證明了改性的低成本玻璃纖維填料可以生產(chǎn)我們正在尋找的剪切增稠電解質(zhì)，這與商用鋰離子電池兼容并且顯示出改善的抗沖擊性。“

 

來自朱氏集團(tuán)的視頻展示了不同速度的子彈影響常規(guī)液體電解質(zhì)和剪切增稠電解質(zhì)。剪切增稠電解質(zhì)吸收了動能并顯著減慢了移動的子彈。

???? ?? ???? ????, ????? ?? ????? ??? ??? ?? ???.?? ???? ??? ?? ??? ??? ???? ????, ??? ???? ??? ? ? ?? ?? ?? ??? ??? ? ??.?? ?? ??? ??? ?? ??? ???? ?? ????. ??? ????? ????? ??? ???? ????.

 

 

 

 

 

??? ??????? ???? ??? ????? ??? ?? ?????? ????? ???.?? ???? ?? ??? ?? ??? ??? ??? ????.

 

 

 

?? ??, ?? ????? ?? ?????? ???? ?? ??? ??? ? ??? ???? ??? ?? ?? ???? ?? ??? ???? ??.?? ??? ?? ?? ??? ??? ? ??.?? ?? ‘ ? ?? ’ ? ?? ??? ???? ?? ???? ??? ? ??.

 

 

 

 

 

"?? ??? ???? ??? ??? ??? ?? ??? ?? ? ????? ??? ??? ? ??? ???"? ???.??? (UA).“??? ???? ???? ????? ???? ???? ???? ?? ??? ??. ?? ?? ? ?? ???? ??? ??? ??.”

 

 

 

 

 

?? ?? UA ??? ??? ??? ????? ??? ??? ??? ????? ??? ???? ??? ??.??? ??? ??? ? ?? ??? ??? ??? ? ??? ??? ???? ???.???? ????? ?? ???? ???? ????.

 

 

 

 

 

? ??? ??? ???? ????.?? ???? ??'?? ??'? "?? ?? ??? ??? ?? ?? ?? ???"??? ?? ????.

 

 

 

 

 

"?? ???? ??? ?? ???? ? ??? ??? ?? ???? ?? ?? ???? ??? ????."?? ??? ???.“ ??? ?? ???? ?? ???? ??? ?? ??? ???? ????. ? ?? ??? ?? ???? ??? ??? ??? ???? ???? ?? ????.??? ??? ??? ???? ???? ??? ???? ??? ? ??? ???. ??? ??? ??? ?? ???? ??? ??? ??? ?? ? ??? ???.?? ?? ??? ??? ?? ??? ???? ?? ????.?.

 

 

 

 

 

??? ?? ???? ??? ? ??.??? ?? ?? ??, ??? ?? ??? ???, ??? ???? ?? ??? ??? ??.??? ?? ??? ??? ??? ?? ? ???? ?? ???.??? ??? ??? ??? ????? ???? ??? ?? ???? ???? ?? ? ??.

 

 

 

 

 

?? ??? ??? ???? ??? ??? ???.??? ????? ???? ?? ???? ???? ?? ????.??? ??? ???? ???? ????? ????? ??? ?? ???? ?? ??? ???? ??? ???? ??? ?? ??, ??? ?? ???? ????.

 

 

 

 

 

"??? ???? ????"??? "???? ??? ?? ?? ??? ??? ? ??? ?? ????. ??? ?? ?? ??? ???? ???? ??? ??? ?? ???? ????"? ???.?.

 

 

 

 

 

?? ??? ???? ?? ??? ??? ???? ?? ???? ?? ??? ?? ???.??? ??? ?? ??? ??? ???? ???? ??? ??? ??.