American scientists published in the latest issue of "Science Progress" magazine's paper said that the lithium ion concentration in lithium-ion batteries will fluctuate, which explains the reasons for the shorter life of lithium-ion batteries, and is expected to help develop faster charging, Longer battery life.

A research team led by the US Department of Energy's Brookhaven National Laboratory recently discovered that when the battery generates current, if the battery's electrodes are made of nanoparticles, the concentration of lithium ions in some regions of the nanoparticles will rise first, and then The decline, not the concentration that has been considered until then, will continue to increase.

The lattice is a structure in which the particles inside the crystal are arranged in a certain geometrical pattern. Lithium-ion batteries work on the principle that lithium ions move between the positive and negative polarities of the lattice. When charging, lithium ions flow from the positive electrode to the negative electrode, and vice versa.

"Similar to the water absorption of sponges, we see that the total concentration of lithium ions in nanoparticles is increasing," said Wang Feng, a scientist at the Bruker Haven National Laboratory for Sustainable Energy, who presided over the study. "But unlike water, lithium ions Selective outflows from certain areas cause inconsistencies in the lithium ion concentration between the lattices."

The researchers pointed out that before lithium ions enter the lattice, the lattice structure is very uniform. Once lithium ions enter, they will stretch the lattice. When lithium ions flow out, the lattice will shrink again. The uneven movement of lithium ions may cause permanent damage because it deforms the structure of the active ingredient in the battery and may cause fatigue failure of the battery.

Researchers speculate that this phenomenon may also occur in the chemicals of other high-performance batteries. The results of this study can help develop batteries with shorter charge times and longer standby times.

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