The Reason For The Shorter Life Of The Lithium Battery Has Been Found, New Progress In The Battery
A research team led by the Brookhaven National Laboratory of the U.S. Energy Department has recently discovered when the battery generates current, if the battery's electrodes are made of nanoparticles, the lithium ion concentration in some areas of the nanoparticles will first increase and then decrease, rather than constantly decease the concentration has been previously thought to.
A lattice is the structure of particles arranged in a geometric pattern. The principle of lithium ion battery is the movement of lithium ion between positive and negative electrode lattices. During the charging process, the lithium ion is flowing from the positive pole to the negative electrode. The discharging process is opposite.
"Similar to the sponge water absorption, we see the total concentration of nanoparticles of lithium ions is increasing," said Wang Feng, a scientist at Brookhaven national laboratory for the sustainable energy technology, who led the study, "Unlike water, however, lithium ions selectively flow from certain regions, resulting in inconsistent concentrations of lithium ions in the crystal lattice."
The researchers point out that when lithium ions enter the lattice, the structure of the lattice is very uniform. Once lithium ion enters in, it will stretch the lattice. When the lithium ion flows out, the lattice will shrink again. The inhomogeneous movement of lithium ions may cause persistent damages due to the structural deformation of the active components in the battery, leading to fatigue and failure of the battery.
The researchers speculate that the phenomenon could also occur in other high-performance battery chemicals, which could help develop batteries with shorter charge yet longer standby time.