[Rarely] Heating the lithium battery, may it be able to restore the capacity of the battery to a certain extent?

Can a lithium battery be grilled with charcoal to extend its service life? Or, you may one day bake them when they are no longer in use. Properly baking the lithium battery can extend its service life. In the process of charging and discharging lithium batteries, as the number of cycles increases, the electrodes of rechargeable batteries will grow tiny dendrites resembling branches, called lithium battery electrode dendrites. This kind of object will cause The internal short-circuit of the battery or the directly scrapped battery may cause a fire in serious cases. Therefore, researchers at Howard's Work University have explored in detail how to decompose these dendrites at higher temperatures to extend the life of lithium batteries as much as possible. The battery is composed of a positive electrode and a negative electrode. When a current is generated, electrons flow out of the anode and flow back to the cathode through an external circuit. Some of the atoms in the anode lose the electrons that generate the current and are converted into ions, and then the conductive liquid medium of the electrolyte moves to the anode. This is the entire discharge process of the battery. This process is reversed when the battery is charged, and the ions return and attach to the anode. However, the adhesion of ions is not uniform. They form tiny bumps. After many charging cycles, they eventually grow into dendrites that resemble tree branches. When these dendrites reach and touch the cathode, they cause an internal short circuit. Because the current passes through the dendrites to release electrons, rather than an external circuit. As a result, the battery fails and is scrapped. The current will also heat the dendrites, because the electrolyte is flammable, and the heated dendrites can ignite them. Even if the dendrites are not short-circuited, they will fall off the anode and float in the electrolyte, so the anode will lose material and the battery will not be able to store the same amount of electricity. This is the process of battery capacity decay. California Institute of Technology scientist Ashhar Yalian Farr said: 'Dendrites are very dangerous. They not only directly affect the service life of lithium batteries, but also reduce the capacity of rechargeable batteries. '. His research was published on the cover of 'Journal of Chemical Physics'. 'Dendrite problem is common in all rechargeable batteries.' When the researchers tested the battery, they found that after heating it for a few days, the temperature of 55 degrees Celsius shortened the dendrites by 36%. To find out the exact cause of the shrinkage, the researchers used a computer to simulate the effect of heat on the individual lithium atoms that make up the dendrites, using a simplified ideal pyramid geometry. The simulation results show that there are two ways of movement of atoms. The atom at the top of the pyramid may drop to a lower height, or the lower height atom can move and leave a hole, which is then filled by another atom. The movement of these atoms produces enough motion to knock down the dendrites. The conclusion is that by quantifying the energy required to change the dendrite structure, researchers can better understand its structural characteristics. Although there are many factors that affect battery life at high temperatures, such as the battery's self-discharge tendency or other chemical reactions, this new study shows that it may only take a little charcoal to rejuvenate the battery. Disclaimer: The articles published on this site are all from the Internet and do not represent the views of this site. If there is any infringement, please contact to delete WeChat: Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is infringement, please contact delete One: [Breakthrough] The electrolyte that does not cause a short circuit inside the lithium battery was discovered.