Study shows that oven heating can extend the life of lithium batteries

Study shows that oven heating can extend the life of lithium batteries

Don't put your electronic devices into the oven, at least not yet, but in order to get more lasting battery life, one day you will put them in the oven when not in use.

Over time, the electrodes in the rechargeable battery will grow some tiny dendritic filaments. These filaments are called dendrites. They may cause the battery to short-circuit, let the battery hang, or even the battery burns. Etc. Fortunately, after new experiments and computer simulations, we have a solution to this problem.

Weifeng Network October 26 news, recently, researchers from the California Institute of Technology discussed in detail how to solve these dendrites through higher temperatures, and may extend the life of the battery, take a look at it together.

First of all, let's talk about the internal condition of the battery that works normally. When the battery generates current, electrons flow out of the anode and flow into the cathode through the circuit outside the battery. The anode is usually composed of a conductive metal such as lithium, and some of its internal atoms become ions after losing electrons (used to generate electric current) and move to the cathode through a conductive liquid medium called an electrolyte.

Charging the battery is a flipping process and the ions return to the anode. But when they do this, the ions do not adhere evenly to the anode. Instead, these ions form a microscopic slope that eventually becomes a long branch after multiple charge cycles.

When these dendrites come in contact with the cathode, they cause a short circuit. At this point, the current will flow through the dendrites without going through an external circuit, and the battery will lose its usefulness and die.

The current flowing through the dendrites also increases the temperature of the latter, and the electrolyte is usually a flammable material. Therefore, the dendrites may be burned due to high temperatures. In addition, even if the dendrites do not cause the battery to short circuit, they will fall off the anode and float in the electrolyte. At this time, the anode loses material, and the battery cannot store as much power as it did.

The research results have already reached the cover of the American Journal of Chemical Physics. Asghar Aryanfar, a scientist from Caltech University, said: "The dendrites are very dangerous and will reduce the capacity of rechargeable batteries." He said that although the researchers studied the most effective lithium batteries, the results can be widely used. Because the problem of dendrites is very common on rechargeable batteries.

Researchers tested the dendritic lithium cells and heated them for several days. They found that a high temperature of 55 degrees Celsius can effectively shorten the length of dendrites by up to 36%.

To find out exactly what caused this shrinkage, researchers used a computer to simulate the effect of heat on a single lithium atom. The simulation results show that the increase in temperature causes lithium atoms to "shuffle" the general movement that is sufficient to overturn the dendritic structure.

Asghar Aryanfar said that by quantifying how much energy is needed to change the structure of dendrites, researchers can better understand their structural characteristics. The results of this study show that rejuvenating your battery may require only a few extra calories.

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