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MessagePosté le: Sam 29 Sep - 03:55 (2018)    Sujet du message: Dame Vans Old Skool Lyserød Hvid Udsalg Répondre en citant

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SAN FRANCISCO, Aug. 5 (Xinhua) -- A team of researchers has devised a way to peer into the electrochemical reaction that fuels lithium-ion battery, the most common rechargeable cell in use today.

The team, led by William Chueh, an assistant professor of materials science and engineering at Stanford University and a faculty scientist at the U.S. Department of Energy's SLAC National Accelerator Laboratory, reported their work a paper published this week in the journal Science.

By visualizing the fundamental building blocks of batteries, namely small particles typically measuring less than 1100th of a human hair in size, the researchers have illuminated a process that is far more complex than once thought.

"It gives us fundamental insights into how batteries work," said Jongwoo Lim, a co-lead author of the paper and post-doctoral researcher at the Stanford Institute for Materials & Energy Sciences at SLAC.

"Previously, most studies investigated the average behavior of the whole battery. Now, we can see and understand how individual battery particles charge and discharge."

At the heart of every lithium-ion battery is a simple chemical reaction in which positively charged lithium ions nestle in the lattice-like structure of a crystal electrode as the battery is discharging, receiving negatively charged electrons in the process. In reversing the reaction by removing electrons, the ions are freed and the battery is charged.

These processes, known as lithiation (discharge) and delithiation (charge), are hampered by an electrochemical Achilles heel.

Rarely do the ions insert uniformly across the surface of the particles. Instead, certain areas take on more ions, and others fewer. These inconsistencies lead to mechanical stress as areas of the crystal lattice become overburdened with ions and develop tiny fractures, sapping battery performance and shortening battery life.

"Lithiation and delithiation should be homogenous and uniform," said Yiyang Li, a doctoral candidate in Chueh's lab and co-lead author of the paper.

"In reality, however, they're very non-uniform. In our better understanding of the process, this paper lays out a path toward suppressing the phenomenon."

And counteracting the detrimental forces could lead to batteries that charge faster and more fully, lasting much longer than today's models.

The study visualizes the chargedischarge reaction in real-time -- something scientists refer to as operando -- at fine detail and scale, according to a news release from Stanford. The team utilized brilliant X-rays and cutting-edge microscopes at Lawrence Berkeley National Laboratory's Advanced Light Source.

"The phenomenon revealed by this technique, I thought would never be visualized in my lifetime. It's quite game-changing in the battery field," said Martin Bazant, a professor of chemical engineering and of mathematics at Massachusetts Institute of Technology (MIT) who led the theoretical aspect o. Custom NHL Jerseys China   Wholesale Jerseys   Wholesale Jerseys From China   Wholesale Jerseys Cheap   Wholesale NCAA Jerseys China   Wholesale College Jerseys   Wholesale NBA Jerseys   Wholesale NBA Jerseys Cheap   Wholesale MLB Jerseys From China   Cheap Basketball Jerseys 

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MessagePosté le: Sam 29 Sep - 03:55 (2018)    Sujet du message: Publicité

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