The team has developed a material capable of accelerating the lithium-ion battery charging by up to 90% within 6 minutes (Pixabay).
With the rapid growth of the electric car market worldwide, the search for solutions to battery problems that determine the performance of the vehicle’s operation is increasing.
Electric cars operate with lithium-ion batteries, which consist of a copper elevator and an aluminum landing pad. Both the elevator and the landing pad are covered with a skinny layer of a thickness of tenths of a millimeter of a mixture containing lithium and then covered with another layer whose thickness does not exceed the thickness of a hair and consists of special porcelain that can bear Temperatures up to 700 ° C from below to ignite.
Reducing charging and discharging time
The research team of Pohang University of Science and Technology, writing the acronym “POSTECH,” has developed a material capable of accelerating lithium-ion battery charging by up to 90% within 6 minutes also gives an extended life for electric cars.
Scientists and researchers formed the research team from the Department of Materials Science and Engineering at Pohang University in cooperation with scientists and researchers from the Department of Energy Sciences of the Sungkyunkwan University of Korea.
The team has demonstrated for the first time that when performing a battery’s charging and discharging process, high power can be produced by drastically reducing the charging and discharging time without reducing the particle size involved in the components of the battery itself.
The results of their research were published in the journal Energy & Environmental Science on September 17, and the press release on the study was published on the website Phys.org on October 23.
Electric cars are powered by lithium-ion batteries that consist of a copper elevator and an aluminum landing gear (Pixabay).
Avoiding the disadvantages of traditional methods
Under conventional methods, lithium-ion batteries are charged by reducing the particles that make up the electrode materials. However, particle size reduction has an important drawback: it reduces the volumetric energy density of batteries.
Thus, the research team confirmed that if an intermediate stage is formed in the transition phase during charging and discharging, high energy can be generated without losing the high energy density and reducing the particle size, thus enabling the sustainable development of lithium-ion batteries.
The matter can be clarified as follows: In the phase of separation of materials that enter into the creation and development of a new phase upon charging and discharging, two phases of two different sizes arise in each molecule, which leads to structural faults in the overlap region between the two phases, and these faults prevent the rapid activation of a new phase within the molecule, Delays both fast charging and rapid discharging.
By adopting the industrial method developed by the research team, one can add an intermediate stage that acts as a buffer and greatly reduces the difference in size between the two phases inside the molecule.
According to conventional methods, lithium batteries are charged by reducing the size of the particles that make up the electrode materials (pixabay)
Speed up injection and removal of lithium
Moreover, it has been confirmed that this developed buffer intermediate phase can assist in creating and enhancing a new intra-molecular phase, which improves the injection speed and removal of intramolecular lithium.
In turn, this proved that the formation of the intermediate phase could dramatically increase the charge and discharge speed of the cell by creating a homogeneous electrochemical reaction inside the electrode formed by a large number of molecules.
As a result, the electrodes for the lithium-ion battery manufactured by the research team charge 90% in 6 minutes and can discharge 54% in 18 seconds, which is seen as a promising sign in high-performance development lithium-ion batteries.
Source: American Press