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What causes the battery aging?

by:Vglory      2020-09-16
Stanford university recently conducted a study of the behavior of the tiny particles in the lithium battery electrode, according to a study on the battery fast charge and then used for high power fast work for damage of the battery power consumption may was not as bad as the researchers had expected, and the benefits of slow charging and discharging may also be exaggerated. Challenge the results of the study about super charging battery to electrode demand higher than slow charging prevalent point of view, from Stanford university and the U. S. department of energy (doe) SLAC national accelerator laboratory at Stanford university, materials and energy science ( SIMES) The researchers said. They also say the scientists, or may be able to change battery electrodes or charging ways to enhance the charging and discharging process of unification, to extend battery life. 'In the process of charging and discharging electrodes in the details of the chemical process is just one of many factors determine the battery life, but it is a factor in the study before we have not yet been fully understand,' study senior author, Stanford university, an assistant professor of materials science and engineering college, SIMES que hold in esteem ( 威廉·Chueh) Said. 'We found that the battery aging new Angle. 'These results can be directly applied in many modern commercial lithium-ion batteries used by oxide and graphite electrode. The study was published in the September 14 in the journal nature materials. Research team from the United States at the Massachusetts institute of technology, the Sandia national laboratories, South Korea's samsung cutting-edge technology research institute and the Lawrence Berkeley national laboratory, research collaborator. Ion batteries in the observation of cell loss is an important reason in the process of charging and discharging, positive and negative electrodes in the absorption and release of electrolyte ion of expansion and contraction. In the study, the scientists studied by billions of a positive electrode of the lithium iron phosphate nanoparticles, if most or all of the ions are active to participate in the charging and discharging process, so they will be relatively unified the absorption and release of ions. But if only a small portion of the particles absorbed all ion, so they are more likely to crack and damage, reduce the battery life. About the properties and behavior of nanoparticles, and previous studies have produced conflicting points of view. In order to further investigate the truth, the researchers created a small coin battery, with different current they are no longer at the same time, then quickly put them separate and flush the components to prevent charging/discharging process. Then scientists will cut the electrode into very thin slices and put them to the Berkeley national laboratory using synchrotron intensive advanced lighting set X line for testing. Rapid discharge of new insights 'we can study at a time thousands of electrode nanoparticles and snapshots taken at different stages in the process of charging and discharging,' study lead author, Stanford university graduate student Li Yiyang ( 益阳李) Said. 'This study is the first item on the condition of different charging and discharging detailed comprehensive survey of the charge and discharge process. 'By taking advantage of the MIT research and development of a mature model analysis data, the researchers found that only a small portion of nano particles in the process of charging to absorb and release the ion, even if this process occurs very quickly. But when the battery is discharging, a funny thing happened: as discharge rate increased beyond a certain limit, more and more many particle start synchronization absorption of ions, into a more unified, less damage model. Suggesting that scientists may be able to distort electrode materials or the process that under the premise of ensure a long battery life, charging and discharging rate or faster. According to li, said the next step is in the cycle of hundreds of times and even thousands of times to run battery electrodes to simulate the situation of the real world. Scientists hope to take the battery in the process of charging and discharging snapshot, rather than to interrupt the process to separate the battery components. This should be able to produce more realistic point of view, and this process can be in a synchrotron, such as ALS or SLAC Stanford synchrotron radiation light source. Li also said that the current team is working in close cooperation with industry, investigating how these findings will be used in transportation, and consumer electronics. The study got the samsung advanced institute of technology institute of global innovation development project, the project of Stanford and la walcott energy institute, samsung - MIT energy application material design project and funded by the U. S. department of energy.
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