according to UK media lithium battery capacity equivalent to 10 times of lithium ion battery, but because of a fatal defect has not been commercialized: when the lithium battery charge and discharge, lithium will not be evenly gathered on the electrode.This buildup can significantly shorten battery life, and, more importantly, it can lead to short circuits and fires.
According to the science news website reported on March 15, now, the United States at the university of Illinois at Chicago (UIC), the researchers developed a to the graphene oxide coating "nano" to solve this problem: the nanometer sheet in between the two electrodes of lithium batteries could prevent lithium uneven gathered themselves together, and make the battery after hundreds of times of charge/discharge cycle can still work safety.The researchers published their findings in the American journal advanced functional materials.
This paper studies the corresponding author, the UIC college of engineering, ms reza shah, an associate professor of mechanical and industrial engineering, Mr. Weaver - and sal said: "our findings show that two-dimensional material -- in this case for graphene oxide lithium - can help regulate gathered themselves together, and to extend the service life of lithium batteries."
In lithium-ion batteries, a diaphragm is placed in an electrolyte, the report said.The diaphragm is usually made of porous polymers or glass ceramic fibers that allow the lithium ions to pass and block other parts in case of a short circuit that could cause a fire.
Shah, Mr. Weaver, thrall and his colleagues in lithium batteries used in an improved to regulate the flow of the lithium ion diaphragm, to control the lithium gathered speed, and then see if it can prevent the formation of lithium dendritic crystals.They sprayed graphene oxide onto a glass fiber diaphragm to create what they called a "nano-chip".
The study's first author, tara f LuZan UIC college of engineering graduate student, said researchers using a scanning electron microscope and other imaging techniques to show that when the nanometer piece used in lithium batteries, lithium lithium electrode surface to form a uniform layer of membrane, which actually improve the performance of the battery and battery safer.
Molecular simulations led by a team of researchers at Texas a&m university show that lithium ions temporarily combine with graphene oxide and then spread through nanoscale defects in the nanoscale.This slows the passage of lithium ions, preventing dendrites from forming lithium on the electrodes.