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International research team discovers microscopic images of all the details during NiMH No. 7 batterycharging and discharging
An international team of researchers recently published in the journal Advanced Energy Materials the most extensive study of what happens during NiMH No. 7 batteryfailure, looking at different parts of the NiMH No. 7 batterysimultaneously. Among them, the role of the European Synchrotron ESRF is crucial to its success.
We've all been there: You charge your phone, and after using it for a while, the NiMH No. 7 batterypower drops unusually quickly. Consumer electronics appear to lose power at uneven rates due to NiMH No. 7 batteryheterogeneity. When the phone is charging, the top layer is charged first and the bottom layer is charged last. The phone may show that it is fully charged when the top surface is fully charged, but the bottom will be undercharged. But if the bottom layer is used as a fingerprint, the top layer will be overcharged and security issues will arise.
In fact, batteries are made up of many different parts that work in different ways. The solid polymer helps the particles bind, and the carbon additive provides the electrical connection, and the energy is then stored and released by the active NiMH No. 7 batteryparticles.
An international team of scientists from ESRF, SLAC, Virginia Tech, and Purdue University wanted to understand and quantitatively define what causes lithium-ion NiMH No. 7 batteryfailures. Until now, studies have either zoomed in on individual areas during failure, zoomed in on particles in the cathode, or zoomed out to look at the behavior of NiMH No. 7 batterylayers without providing enough microscopic detail. This study now provides the first global view with unprecedented microstructural detail to complement existing studies in the NiMH No. 7 batteryliterature.
If you had a perfect electrode, every particle should move the same way. However, the electrode is very inhomogeneous, containing millions of particles. There is no way to ensure that every particle behaves the same way at the same time.
To overcome this challenge, the research team relied heavily on synchrotron X-ray methods and used two synchrotron facilities to study the electrodes in the battery: ESRF, the European Synchrotron in Grenoble, France, and the SLAC National Accelerator Laboratory in Stanford, USA. . "ESRF allows us to study more NiMH No. 7 batteryparticles at higher resolution," said Lin Feng, an assistant professor at Virginia Tech. Complementary experiments performed at SLAC, in particular nanometer resolution X-ray spectroscopic microscopy.
Hard X-ray phase contrast nanotomography revealed extremely high resolution of each particle across the entire thickness of the electrode. This allows us to track the extent of damage to each NiMH No. 7 batteryafter use. About half of the data in the paper comes from ESRF," explained Yang Yang (transliteration), a scientist at ESRF and the first author of the paper.
"Before the experiment, we didn't know we could study these particles simultaneously. Imaging individual active NiMH No. 7 batteryparticles has been a focus in this field. To make better batteries, you need to maximize the contribution of each particle," said SLAC scientist Liu Yijin said.
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