2023-08-28 13:46:58
The distribution of lithium concentration is indicated by colors during the charging process of a graphite negative electrode. -QUEEN MARY UNIVERSITY
MADRID, 28 Ago. (EUROPA PRESS) –
Researchers have found a way to avoid lithium deposition around the anodes of batteries for electric cars of this technology, which can cause problems in your recharge.
The article was published in the magazine Nature Communications by a team led by Dr Xuekun Lu of Queen Mary University of London, in collaboration with an international team of researchers from the UK and US.
Lithium deposition is a phenomenon that can occur in lithium-ion batteries during fast charging.. It occurs when lithium ions accumulate on the surface of the battery’s negative electrode instead of intercalating in it, forming a layer of metallic lithium that continues to grow. This can damage the battery, shorten its life, and cause short circuits that can lead to fire and explosion.
Dr. Xuekun Lu explains that lithium coating can be significantly mitigated by optimizing the microstructure of the graphite negative electrode. The graphite negative electrode is made up of randomly distributed small particles, and adjust the morphology of the particles and electrodes to achieve homogeneous reaction activity and reduced local lithium saturation. it is the key to suppressing the lithium coating and improving battery performance.
“Our research has revealed that the lithiation mechanisms of graphite particles vary under different conditions, depending on their surface morphology, size, shape and orientation. This greatly affects the lithium distribution and propensity to the lithium coating,” said it’s a statement Dr. Lu. “With the help of a pioneering 3D battery model, we are able to capture when and where the lithium coating starts and how fast it grows. This is a significant advance that could have a major impact on the future of electric vehicles.”
The study provides new insights into the development of advanced fast charging protocols by improving the understanding of the physical processes of lithium redistribution within graphite particles during fast charging. This knowledge could lead to an efficient charging process. while minimizing the risk of lithium coating.
In addition to faster charge times, the study also found that refining the microstructure of the graphite electrode can improve the energy density of the battery. This means that electric cars could travel farther on a single charge.
These findings represent a breakthrough in the development of batteries for electric vehicles. They could lead to faster charging, longer lasting and safer electric cars, which would make them a more attractive option for consumers.
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