![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
According to a recent report by the Physicist Organization Network, American scientists have found a way to replace graphite with a silicon sponge as a component in a rechargeable lithium-ion battery, thereby enabling the development of longer lasting and more powerful batteries for commercial use. Equipment and electric cars. The study was published in the Journal of Materials Chemistry, published this month by the American Chemical Society.
The study was conducted in collaboration with Rice University and Lockheed Martin, the leader of the study, Professor Spani Lisa Biswall, professor of chemistry and biomolecule engineering at Rice University, and the University of Mandouri. Sacker’s article points out that using this process they developed, they can store objects that are 4 times heavier than themselves in lithium.
Silicon is one of the most common elements on earth and can replace graphite as an anode in batteries. Previously, the team discovered that porous silicon absorbs lithium more than 10 times as much as graphite. This is because silicon absorbs lithium ions and expands, and the sponge-like structure gives room for silicon to grow inside the battery without damaging the performance of the battery. In 2010, the team found that when silicon sponges had 1 micron wide and 12 micron deep pores, they could flex their muscles in the field of batteries, but the solid silicon base at that time could not absorb lithium, and it still needs improvement.
In the latest research, scientists discovered that the electrochemical etching process used to make these small holes separates the sponge from the base, which can then be reused to create more sponges. According to the researchers, at least four such sponges can be extracted from a standard 250-micron-thick silicon wafer. Once it is extracted from a silicon wafer, it is opened up and down, and its conductivity is greatly enhanced by immersing it in a conductive polymer binder polyacrylonitrile (PAN).
The scientists thus obtained a hard film that could be attached to a current collector and placed in a battery structure. Finally, a process was used to create a lithium-ion battery with a discharge capacity of up to 1260 mA/g. This gives it a longer service life.
In the comparison, the researchers found that the initial discharge capacity of the battery was 757 milliamperes per gram before using the film, but after the second charge-discharge cycle, the discharge capacity began to drop rapidly and completely disappeared after 15 cycles. The treated film began to increase its discharge capacity after 4 cycles, and porous silicon appeared to be particularly noticeable. After 20 cycles, the discharge capacity of the battery was still intact.
Currently, scientists are studying technologies that are expected to greatly increase the number of charge-discharge cycles so that batteries can be developed for several years. (Liu Xia)
Pull Kitchen Faucet,Free Swivel Faucet,Hot And Cold Double Control Faucet
Xuzhou Xinghe New Building Materials Co., Ltd. , https://www.xhceramictile.com