1.2V NiMH batteries

Americans develop MXene 1.2V NiMH batteries electrodes. The spring of electric vehicles may be coming.

According to foreign media reports, researchers from the Department of Materials Science and Engineering at Drexel University in the United States have jointly designed new 1.2V NiMH batteries electrodes with researchers from France and Israel. It may take only a few seconds to charge electric vehicles in the future. MXene is a flat nanomaterial composed of oxides and conductive carbon and metal fillers. Although MXene has excellent conductivity, its structure is not conducive to the dispersion of lithium ions in the battery. The researchers mixed MXene with hydrogel and changed its structure so that lithium ions can move freely. Introduction to the new lithium-ion battery electrode The electrode of the new 1.2V NiMH batteries uses a two-dimensional material called MXene, which has high conductivity. According to the research team, the new 1.2V NiMH batteries may be able to achieve "near-instant" charging of electric vehicles in the future. They said that the new electrode may solve a major technical problem that has long plagued the electric vehicle market. In earlier research, the team set its sights on supercapacitors, which are energy storage devices for portable electronics. Unfortunately, the device can only be used for rapid charging and discharging, not long-term energy storage. Now, engineering researchers at Drexel University have adopted MXene materials, combining the advantages and characteristics of supercapacitors with traditional large-capacity batteries. Lead researcher Yury Gogotsi said the team's research results refute the widely accepted industry dogma that the charge storage of chemicals in batteries is much slower than the physical storage used in electrical double-layer capacitors. Gogotsi claimed in a statement: "We extracted a thin layer of MXene electrode to demonstrate the charging speed, and the entire charging process only took tens of milliseconds. This is mainly due to the ultra-high conductivity of MXene materials, which paves the way for the future development of ultra-fast energy storage devices. In the future, lithium batteries will only take seconds to charge and discharge, and the stored energy will be much higher than conventional supercapacitors." Introduction to MXene materials MXene is a flat nanomaterial that was discovered by researchers in the Department of Materials Science and Engineering at Drexel University in 2011. Its surface resembles a sandwich, consisting of oxides and conductive carbon and metal fillers, and the oxides are equivalent to the bread in the sandwich, sandwiching the fillers in the middle. In the material manufacturing process, researchers will use a lamination method to make MXene. You can imagine the appearance of a barrel of Pringles potato chips, where the layers of the material are overlapped in this way. Disadvantages and improvements of MXene material electrodes Although MXene has excellent conductivity, its structure is not conducive to the dispersion of lithium ions in the battery. For the energy storage of lithium batteries, lithium ions remain in redox-active sites. The more such sites there are, the more power the battery can hold. Importantly, the battery also allows lithium ions to move freely, otherwise they cannot reach the redox-active sites. In order to allow the lithium ions of MXene to move freely, the researchers made certain adjustments to its structure. The researchers mixed MXene with hydrogel and changed its structure so that lithium ions can move freely. Yury Gogotsi said: "The ideal electrode architecture is a multi-lane structure to allow lithium ions to move at high speed. The large-pore electrode design developed by the research team just achieves this goal, allowing the charging process to be completed in just a few seconds." Future prospects for MXene electrodes The university said that the research and development and application of this battery material is of great significance, and it has largely solved a major technical difficulty that has been hindered in the promotion of electric vehicles. Gogotsi said: "If this low-dimensional conductive material battery electrode is adopted in the future, it will greatly improve the charging efficiency and power of the battery, and then improve the charging speed of vehicles, laptops, and mobile phone batteries. It only takes seconds or minutes to complete, without waiting for hours." Gogotsi said that the biggest advantage of using MXene as an electrode material is its conductivity. However, the research team also admitted that the electrode material and related technologies seem to be very promising, but it is still uncertain what the actual situation will be after the successful trial production and use in vehicles. However, they said that once used in vehicles and mobile phones, it will completely overturn the current batteries.

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