The performance of the battery is critical to the electronic device. Charging time is short, long duration, is the current widespread use of lithium-ion battery expectations. Recently, researchers from the US Department of Energy's Lawrence Berkeley National Laboratory and Stanford University collaborated to develop a new X-ray microscope (STXM) that closely observes particle activity during charge-discharge of lithium-ion batteries, This may help to develop more powerful lithium-ion batteries.
In a paper published in the latest issue of Science, the team said they used the advanced light sources from Berkeley Labs to create a "Liquid Electron Microscopy Nano Imaging Platform" that can image 30 particles at a time. The researchers said the new platform has a larger field of view and greater penetration than the TEM used in the past, allowing users to observe some of the chemical-specific changes in real time.
The team used the platform to observe the lithium iron phosphate particles in the charging and discharging process, imaging, detailed records of the particle chemical composition evolution and chemical reaction rate and so on. They found that the charge on the surface of the particles is not uniform and will get worse over time.
In theory, when the battery is charging, the positively charged lithium ions evenly cover the surface of the electrode. However, in fact, this situation is very difficult to occur, especially after the battery is aged.
The researchers said the new technology platform makes it possible for them to image real-time battery activity at the mesoscopic scale, which is difficult but important to do. With this technology, they have the ability to analyze changes in particle chemistry and current density in real time, investigate the battery charge-discharge process, and image the electrochemical reactions within a single cell particle, a better understanding of the battery charging mechanism And optimize the battery performance is very helpful.
The team is currently designing a more accurate X-ray microscope with a target resolution of 1 to 5 nanometers.
A solid-melting furnace, the two sides of the furnace body of the solid-melting furnace are respectively provided with a feeding door and a discharging door; A workpiece conveyor belt that can place workpieces, a plurality of heating units are respectively arranged in the furnace along the feeding direction, and the heating units include an air guide device, a heat radiation tube and a heat circulation fan. The cover is arranged above the workpiece conveyor belt, the thermal circulation fan and the heat radiation pipe are fixed in the inner recess of the air guide device, and the two sides of the inner recess of the air guide device are provided with air inlets and are connected with the air outlet of the heat circulation fan. The hot air blown by the fan is guided by the air guide device and then all blown onto the surface of the workpiece placed on the workpiece conveyor belt. The solid melting furnace can improve the guidance of the heat flow, ensure that the workpiece is heated evenly, thereby improving the heating quality, and at the same time, it can meet the requirements of the furnace. The internal temperature difference is 1.5℃~2℃.
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