Scientists have discovered another reason why EV batteries cannot be charged in a few minutes

It is said that haste can be wasted. Such a large volume may be particularly true of batteries, as a new study seeks to identify the causes of low-rechargeable lithium-ion batteries in electric vehicles.

According to a new study from the US Department of EnergyDoe) At the Argonne National Laboratory, scientists discovered the pleasant chemical properties of one of the two terminals when the battery was charged and discharged.

Lithium-ion batteries contain a positively charged cathode and a negatively charged anode, which are separated by an electrolyte that moves lithium ions. The anode in these batteries is usually made of graphite – the same material found in many pencils. In lithium-ion batteries, however, the graphite is collected from small particles. In these particles, lithium ions can integrate into a process called mutual. When interaction occurs correctly, the battery can successfully charge and discharge.

However, the faster the battery is charged, the more difficult it will be to disconnect. Instead of simply getting into the graphite, lithium ions accumulate on the anode surface, resulting inTerminal Damage to Battery Damage – No Penalty Considered – On Battery.

Plating is one of the main causes of battery failure during fast charging, ”said Daniel Abraham, an Argon battery scientist who co-authored the study. .When we quickly charged the battery, we noticed that in addition to the surface of the anode, feedback products accumulated in the electrode holes. As a result, the anode itself, to some extent irreversible expansion, impairs battery performance.

Abraham and his colleagues at the University of Illinois at Urbana-Champaign studied another significant change in graphite particles using the scanning electron nanofraction. At the atomic level, the entanglement of the graphite atoms on the edge of the particle is distorted because of repeated charging, which hinders the process. .Basically, we see that the atomic network in the graph is twisted, which prevents them from finding lithium ions.“In the luxury – they stick on the carpet,” he said.

The faster we charge our battery, the more likely it is that the anode will become atomic, which will eventually prevent the lithium ions from moving forward and backward, Abraham said. .The important thing is to find ways to prevent this loss of organization or to somehow adjust the graphite particles so that the lithium ions can combine more efficiently.

Paper based on the study,Disruption at the edge of the graphite particle has increased by separating the long-term balance of anodes from fast-charged lithium-ion cells. ”It appeared in October. 8 Case of Journal of Electrochemical Society.

In addition to Abraham, other authors of the study include Argonne Marco-Tulio Rodriguez, as well as Gian-Min Zoo and the University of Illinois at Urbana-Champaign. The study was funded by DoeThe Bureau of Science and Pedaparti Research is funded by the Bureau of Science Graduate Studies (SCGSR) Intends to prepare graduating students. STEM Critical professions DoeMissions.

Argonne National Laboratory It seeks solutions to urgent national problems in science and technology. Argon, the country’s first national laboratory, conducts leading scientific and practical research in all fields of science. Argon researchers work closely with researchers from hundreds of companies, universities, and federal, state, and municipal agencies to solve their unique problems, advance US scientific leadership, and prepare the country for a better future. With staff 60 Nations, Argon is governed by the UChicago Argonne, LLC To the US Department of Energy Science Office.

US Department of Energy Science Office It is the largest supporter of basic research in the physical sciences in the United States and is working to address some of the most pressing challenges of our time. Visit https: // energy .gov / science for more information.

See original study

Article by (DOE Science News Source) Argonne National Laboratory.

Image courtesy of Argonne National Laboratory.

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