Can the new electrode material really speed up battery charging?

The niobium tungsten oxide used in the current work has a rigid open structure. The arrangement of atoms is very complicated, but Griffith believes that the complexity of the structure and the mixed metal composition are the reasons for the magical transmission properties of the material. Many battery materials are based on the same two or three crystal structures, but these niobium tungsten oxides are fundamentally different, Griffith said. The oxide is kept open by the props of oxygen, which allows lithium ions to pass through them in a three-dimensional manner. Oxygen columns or shear planes make these materials harder than other battery compounds, so the addition of their open structure means that more lithium ions can pass through them at a faster rate. The researchers used a technique called pulsed field gradient (PFG) nuclear magnetic resonance (NMR) spectroscopy, which is not easy to apply to battery electrode materials. The researchers measured the movement of lithium ions through oxides and found that they are several orders of magnitude The rate of movement is higher than that of typical electrode materials. At present, most of the negative electrodes in lithium batteries are made of graphite and have high energy density, but when charged at high speed, this will short-circuit and cause the battery to catch fire and possibly explode. Gray said: In the use of high interest rates, safety is more important than any other operating environment. Regarding the use of safer graphite substitutes for fast charging, these materials, and other similar materials, are definitely worthy of attention. Niobium tungsten oxide is easy to manufacture. Many nanoparticle structures require multiple steps to synthesize, and you end up with only a small amount of material, so scalability is a real problem, Griffith said. But these oxides are easy to manufacture, without additional chemicals or solvents. Although oxides have excellent lithium transfer rates, they actually result in lower battery voltages than some electrode materials. However, the operating voltage is good for safety, and the high lithium transfer rate means that the actual (usable) energy density of these materials is still high when cycling fast. Although oxides may only be suitable for certain applications, Gray said that what is important is the continuous search for new chemicals and new materials. If you don't keep searching for new compounds, Fields will stagnate, she said. These interesting materials allow us to know very well how we want to design higher rate electrode materials. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.