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According to a paper published in the latest issue of Scientific Progress by American scientists, the concentration of lithium ions in lithium-ion batteries fluctuates, which explains the shorter lifespan of lithium-ion batteries and has the potential to help develop batteries that charge faster and have longer standby times.

A research team led by the Brookhaven National Laboratory of the US Department of Energy recently found that when a battery generates current, if the electrode of the battery is made of nanoparticles, the lithium ion concentration in some areas of the nanoparticles will first increase and then decrease, rather than continuously increasing as previously thought.

A lattice is a structure formed by arranging particles inside a crystal according to a certain geometric shape. The working principle of lithium-ion batteries is that lithium ions move between the positive and negative lattice. During charging, lithium ions flow from the positive electrode to the negative electrode, and during discharge, they are in the opposite direction.

"Similar to sponge water absorption, we see that the total concentration of lithium ions in nanoparticles is constantly increasing," said Wang Feng, a scientist from the Department of Sustainable Energy Technology at the Brookhaven National Laboratory, which led the study. "But unlike water, lithium ions selectively flow out of certain regions, resulting in inconsistent lithium ion concentrations between lattices."

Researchers have pointed out that before lithium ions enter the lattice, the structure of the lattice is very uniform. Once lithium ions enter, the lattice stretches, and when lithium ions flow out, the lattice contracts again. The uneven movement of lithium ions may cause persistent damage, as it deforms the structure of the active components inside the battery and may lead to battery fatigue failure.

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

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