The researchers took X-ray images of the car’s electric buttons as they lowered the time.

The researchers took x-ray images of the electric car buttons as they slowed down over time.

Toby Bond edits a single sample on the BMIT beamline. Available: Canadian Light Source

Canadian Light Source (CLS) researcher Toby Bond uses X -rays to help engineers create powerful electric motors with longer life. His research, published in Journal of the Electrochemical Society, which shows how the release / release of batteries leads to a reduction in energy. This new work shows a link between the cracks created in the material and the depletion of heavy liquids it carries.

Bond uses the BMIT facility at Canadian Light Source at the University of Saskatchewan to perform high -resolution CT scans of the walls. Working with Drs. Jeff Dahn, at Dalhousie University, specializes in electric vehicles, which require research to incorporate as little energy as possible.

“The biggest drawback to energy efficiency is that the more energy you put in, the more energy you put in, the faster the table goes down,” Bond said.

In lithium-ion batteries, it is the cause of the physical charge of lithium ions between the other charges in the electrode, to separate them. Increasing the charge will increase the growth of the material, which will decrease when the lithium ions are released. During many cycles of this growth and decline, micro-cracks begin to form in the material, gradually reducing its ability to hold charge.

“It can lower the contents of the table from the inside out. And if it gets too much trouble inside the table, it can be a security problem.”

Hoʻopaʻa ka poʻe noiʻi i nā kiʻi x-ray o nā pihi kaʻa uila i ko lākou hoʻohaʻahaʻa ʻana i ka manawa

2D cross-sections taken from CT scans of SC-NMC532 / AG were driven for two years at 40 ° C at a UCV of 4.2 V using a cycle-store regulator. The label for each cell indicates the storage time (in hours) between the rounds taken at C / 3 and 100% DoD. The STO-0 phone is always on (no charge time). aie: Journal of the Electrochemical Society (2022). DOI: 10.1149 / 1945-7111 / ac4b83

Learning about this problem, as well as effective coverage and other medications to stop it, is important in school for a long time. Typically, cracks in the table are studied by opening the table and looking at each piece under an electron microscope. This destroys the table, so it will not allow the researchers to maintain the larger building and see the other effects this explosion will have on the rest of the wall.

By using X-ray imaging at CLS, Bond says researchers can study these effects in context, and see how changes are made to the rest of the table. . In this study, the researchers found that while micro-cracking in the cracks was more dangerous, the liquids in the cracks were absorbed into the space between the cracks, and were unlikely to leave. to the water to go all around.

“This is the first time anyone has been able to capture all of these effects working together in a work desk,” Bond said. “This depletion of electrolyte water can cause serious problems, because every part of the table doesn’t have enough water to finish the job.”

In this study, Bond and colleagues studied the roots that were permanently fixed and released at various levels over the years, with different variations that were not used. The 3D X-ray scans they collected with the light and precision of BMIT allow them to clearly see the effect of different materials on use, both on a microscopic scale and on the surface. whole table.

Is it portable? The team found that a small leak on the table was less likely to cause damage than leaking the entire table. Probably due to the small size of the change in charge the physical weight of the electronic devices will decrease over time. This effect is important to note for new applications such as long -distance transportation, electric aircraft, and the use of electric vehicles designed to store and deliver energy in the electric field. These features often need to be used to the fullest extent of the desktop before being re -installed.

“As we start to replace fire engines with electric cars, it’s important to understand how the buttons work under different conditions,” Bond said. “It’s a lot of fun to work on these problems, and we need tools like synchrotrons to understand the fine details of what’s going on in the table as we try new approaches.”


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More information:
Toby Bond et al, In Situ Images of Electrode Thickness Growth and Electrolyte Depletion in Single-Crystal vs Polycrystalline LiNixMnyCozO2 / Graphite Pouch Cells using Multi-Scale Computed Tomography, Journal of the Electrochemical Society (2022). DOI: 10.1149 / 1945-7111 / ac4b83

Courtesy of Canadian Light Source

Directions: Researchers capture X-ray images of electric car buttons when they are lowered in time (2022, April 5) taken on April 5, 2022 from https://phys.org/ news/2022-04-capture-x-ray-images-electric -vehicle.html

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