The study found that the important reason for battery wear is repeated charging

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

The lithium ion battery technology used by electric vehicles, like smartphones, laptops, and almost all electronic products, but this technology is extremely slow. Although electric vehicles can meet the needs of most Americans daily travel, and the mileage of ordinary fuel vehicles is farther away. In addition to the problem with the charging station, the battery charging time is much longer than the time of refueling.

In order to improve the charging capacity of the lithium-ion battery, increase the electric vehicle usage, the automotive industry has to re-examine basic science regarding battery wear. According to foreign media reports, people from multiple research institutes form a research team, and the electrodes of lithium-ion batteries have been most comprehensive to date. They found that most of the reason for battery wear is repeated charging.

Researchers say that manufacturers can use their information, more reliable, and more durable batteries for smartphones or cars. Kejiezhao, Assistant Professor, University of Purdueuniversity, said: "Sometimes, create knowledge is more valuable than solving battery electrode injury. Previously, people did not have related techniques or theories to explain the problem of battery electrode damage.

"The new techniques proposed by the researchers are inherently using artificially driven X-ray tools. Thousands of particles on the lithium ion battery electrodes can be automatically scanned by the machine learning algorithm, and the atoms of the lithium-ion battery electrodes are automatically scanned. There are millions of particles in a battery electrode.

Now, researchers can analyze them more thoroughly, including various simulation operation analysis, such as different voltage windows and charging speeds. ZHAO's laboratory research on how to mutual influence in mechanical and electrochemical. He said: "Most of the previous research are concentrated on a single particle level, and through related analysis, understand the entire battery.

However, this obviously there is a gap, that is, a single particle on the micron scale, compared to the overall large battery, there are many differences. "Whenever the battery is charged, the lithium ions will move back and forth between the positive and negative poles. These ions interact with particles in the electrode, resulting in rupture and degradation over time.

Electrode damage reduces battery charging capabilities. ZHAO said that the battery is difficult to simultaneously high capacity and reliability. Increasing battery capacity usually means sacrificing reliability.

The researchers found that the degradation of the battery particles did not occur at the same time, and some particles were faster than other particles, thereby plotting the damage map of lithium-ion batteries. However, the existing method cannot completely capture the damage process of the battery electrode. For detailed research, the team needs to create a new technology.

Researchers help the European Synchronous Radiation Device (ESRF) and Synchronous Accelerator of Synchronous Radiation Light Sources (SSRL). These large synchronous accelerator facilities have long, carrying almost light-speed particles, release radiation, generating synchronous X-ray images. Researchers in Virginia University of Technology have created materials and batteries for testing, including smartphones, pocket batteries and watches of a watches, etc.

ESRF and SSRL researchers try to make these machines can scan as many electrode particles as possible in batteries, and then generate an X-ray image for analysis. The particle rupture and degradation map of the particles is called "interface debris", and now can be used as a reference tool for the degree of battery electrode damage. In order to understand how these cracks affect battery performance, Zhao has developed theory and computing tools in Peltou University team.

For example, they found that in the place where the lithium ions are rounded, the nearby particles (called "separator") are higher than the particle usage at the bottom of the electrode material, so they fail faster. Under thicker electrodes and fast charging conditions, electrode particles damage or "non-homogeneous degradation" are more severe. ZHAO said: "The battery capacity does not depend on how much the particles in the battery are, how is it to use lithium ions.

"Considering that there are only a few synchronous accelerators in the United States, the project does not allow each researchers and industry participants to use this technology, but they can use the information generated by this technology. Researchers plan to continue to use this technology to record how corruption occurs, and how to affect the performance of commercial batteries. Gaiu.

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