Ways to extend the life of rechargeable batteries

Using rechargeable batteries to extend battery life. High temperature can extend battery life. Researchers at the California Institute of Science have found that experiments and computer simulations have shown that temperature increases may destroy the dendritic structure of the battery electrodes in the cycle of charging and discharging, thereby extending the battery. Life. Heating old charging equipment is usually risky. After a rechargeable battery is used for a period of time, its electrodes will become smaller, and the dendritic dendritic filaments can short-circuit the battery, cause the battery to fail, or cause the battery to ignite or even explode. However, researchers at the California Institute of Science conducted new experiments and computer simulations to carefully study how high temperatures destroy these dendrites, which may extend the life of the battery. The battery pack includes a positive electrode and a negative electrode, also called a cathode and an anode. When current appears in the battery, electrons flow out of the anode and flow into the cathode along the battery's external circuit. After losing the electrons that generate current, some of the atoms in the anode (a conductive metal, such as lithium) become ions, which are then transferred to the cathode through the conductive electrolyte. The process of charging the battery is reversed. The ions will go back and stick to the anode. However, when this process was carried out, the ions were not evenly attached. On the contrary, they will form tiny protrusions, which will eventually become long branches after many charging cycles. When these dendrites contact and communicate with the cathode, they form a short circuit. The current flows through the dendrites instead of through the external circuit, thereby rendering the battery useless. The current also heats the dendrites, because the electrolyte is flammable and the dendrites can catch fire. Even if the dendrites do not short-circuit the battery, they can completely block the anode and float in the electrolyte. In this case, the anode loses material and the battery cannot store more energy. Asgar Aryan, a scientist at the California Institute of Technology, said: Dendrites are harmful. They weaken the capacity of rechargeable batteries. AsgharAryanfar believes that all rechargeable batteries have dendrite problems. The researchers cultivated lithium dendrites on the test battery and heated them for more than 10 days. They found that when the temperature rises to 55°C, the dendrites shrink by 36%. To understand the reason for this contraction, the researchers used a computer to simulate the effect of heating on a single lithium atom, including a dendrites, a simple, idealized model of a vertebral body. This simulation demonstrates two ways to raise the temperature to make the atoms move. The atom at the top of the cone can drop to a lower position, or the atom at a lower position can move, leaving the gap to be filled by another atom. These atoms move randomly, causing enough movement to cause the dendrites to collapse. By quantifying the energy required to change dendrites, researchers can better understand their structural characteristics. Because at high temperature, many factors will affect the life of the battery, such as the battery's own discharging tendency or other chemical reactions on the side of the battery. This new study shows that heating can shorten or eliminate dendrites in rechargeable batteries. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Analysis of the difference between rechargeable batteries and ordinary batteries