Using the internal self-heating effect of the battery to eliminate the anode dendritic accumulation of the lithium battery
Lithium metal anode batteries have a much higher energy density than lithium-ion batteries of graphite anodes, but they have not been able to be commercialized on a large scale because of serious dendrite problems. However, scientists have now discovered that if the charge and discharge cycle at high current densities enhances the self-heating effect of the battery, this can even “cure†the dendritic structure of the lithium battery. Rechargeable lithium-ion batteries are the main applications for consumer electronic products, and are increasingly becoming the battery of choice for electric vehicle and grid energy storage applications. The cathode (cathode) is lithium metal oxide, and the anode (anode) is graphite. But scientists have not given up on lithium-metal batteries with higher energy densities and are tirelessly trying to find a way out for more powerful lithium metal batteries. Researchers at the Rensselaer Polytechnic Institute in the United States have now found a way to use the internal thermal energy of cells to diffuse dendrites into smooth layers, or as described by Nikhil Koratkar, a professor of materials science and engineering at the head of research. Dendrites can be “repaired in place†through the self-heating effect of the battery. The paper is published in the journal “Scienceâ€. We know that the battery basically consists of a cathode, an anode, an electrolyte, and a separator. The separator is located between the two electrodes to prevent them from coming into contact with each other to short-circuit the battery. In addition, the pores of the separator that are filled with the electrolyte are ions (charged atoms) passing through the electrodes. Between the channels, the more electrolyte the separator absorbs, the higher the ion conductivity. When the battery is discharged, the positively charged lithium ions on the anode are transmitted to the cathode to generate electricity; when the battery is charged, lithium ions flow back from the cathode to the anode, and the lithium metal is used as the anode during the repeated charge and discharge process, and the anode surface is easily exposed to lithium. Inhomogeneous deposition and dendrite formation, these thorny deposits eventually penetrate the barrier membrane and come into contact with the cathode, resulting in short-circuiting the cell and causing an explosion hazard. The use of graphite as the anode avoids the lithium dendrite problem and is currently the best battery option, but soon, they may not be able to keep up with the storage capacity requirements. In order to make lithium metal batteries flourish, the researchers proposed a solution that uses the battery's internal resistive heating to eliminate dendrite accumulation. Resistance heating (also known as Joule heating) is a process in which a metal material resists current and thus generates heat. This "self-heating" effect can occur through the charge-discharge process. The researchers then increased the current density (charging-discharging rate) of the battery to increase the self-heating effect. It was found that this process allows the dendrite to spread evenly and smoothly, achieving a “cure†effect. The same results were obtained in the lithium-sulfur battery experiment. Therefore, when the battery is not in use, it can achieve a "self-healing" effect by cycling several cycles of high-rate charge and discharge. The study seems to sound extremely promising. Pressurized charging can rejuvenate the battery, prevent dendrite-induced short circuits, and ensure that the battery is safer and has a high energy density. But does this prevent the battery from rapidly deteriorating? Maybe the team needs to study it further. Now. Upron Bathtub Upron Bathtub Guangzhou Aijingsi Sanitary Products Co.,Ltd , https://www.comoxvalleyhottubs.com