According to the American Physicists Organization Network, American scientists have created a nanocomposite composed of graphene and tin stacked together. This lightweight new material that can be used to make large-capacity energy storage devices can be used in lithium-ion batteries. Among them, its "sandwich" structure also helps to improve the performance of the battery. Related research was published in the latest issue of "Energy and Environmental Science". The leader of the study, Zhang Yuegang, a scientist at the molecular base of the Lawrence Berkeley National Laboratory, said: "Electric vehicles require lightweight batteries, which also require this battery to be charged quickly, and its charging capacity will not be affected by continuous charge and discharge It has been reduced. Our newly developed graphene nanocomposites can improve the performance of batteries. " Graphene is a two-dimensional crystal composed of carbon atoms exfoliated from graphite materials. With only one layer of carbon atoms, it is by far the thinnest and hardest material. Its electrical and thermal conductivity is superior to silicon and Other traditional semiconductor materials. Many people believe that graphene may replace silicon as the material of electronic components in the future, and "show their talents" in many fields such as supercomputers, touch screens and photon sensors. Previous studies by Zhang Yuegang and colleagues have also focused on the application of graphene in electronic devices. In the latest research, the research team fabricated this nanocomposite by alternately stacking graphene and tin. They deposited a layer of tin film on graphene, then placed another layer of graphene on top of the tin film, and then repeated this process to produce this composite material. They also heat-treated the material. By heating it to 300 degrees Celsius in an environment filled with hydrogen and argon, the tin film turned into many pillars, increasing the height of the tin layer. Researcher Ji Liwen said: "For this system, it is very important for tin thin films to form these tin nanopillars. Moreover, we also found that the distance between the top graphene and the bottom graphene will also constantly change to adapt Changes in the height of the tin layer. " The change in height between the graphene layers in the new nanocomposite will improve the electrochemical cycling of the battery, and the change in tin height will improve the performance of the electrode. In addition, this adaptability also means that the battery can be quickly charged, and repeated charging and discharging will not reduce its performance, which is very critical for rechargeable batteries in electric vehicles.
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