Chinese scientists have developed "collision resistant" lithium battery protective material by imitating mussel shell
Xinhua News Agency, Hefei, November 15 (Reporter Xu Haitao) in the event of an electric vehicle crash, it may lead to a fire and explosion of lithium batteries in the vehicle. Recently, inspired by the glowing mother-of-pearl layer in the natural mussel shell, scholars of the University of Science and Technology of China have biomimetic constructed a new type of "mother-of-pearl layer diaphragm" protection material. The experimental results show that it can effectively reduce the possibility of short circuit of lithium battery and improve the safety of lithium battery. The results were published a few days ago in Advanced Materials, a top academic journal in the field of international materials.
At present, the mainstream commercial lithium batteries in the market widely use porous polyolefin materials as battery diaphragm protection materials. When the diaphragm is subjected to external impact, the pore structure is easy to deform and crack, which leads to the disorder of ion current in the battery, which leads to short circuit and even fire explosion.
Mother-of-pearl, which is in the shell of mussel in nature, is a kind of excellent material with "hard and toughness". Recently, professors Yao Hongbin, Ni Yong and Yu Shuhong of the Chinese University of Science and Technology have built a new material with a "layer-by-layer brick-mud" structure on the surface of the polyethylene diaphragm.
The experimental results show that the instantaneous voltage fluctuation range of lithium battery using commercial diaphragm protection material is 60%, while the voltage fluctuation range of battery protected by "imitation pearl mother layer diaphragm" material is less than 20%. And the speed of voltage recovery is faster.
"like a punch on cotton, the unique structure of the new material dissipates the force on both sides and reduces the impact on the inside." Professor Yao Hongbin said that the experiment shows that this new material has a better protective effect on the battery, at the same time, its production cost is not high, and the thickness of the coating is similar to that of the existing commercial materials, so it has a good application prospect. At present, the scientific research team has applied for a patent.