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Compare supercapacitors and batteries, as shown in the surface-mediated battery having three different electrode thicknesses, both high power densities, and high energy density. Source: Where is the American Chemistry Society, it is like a breakthrough in a battery technology, but it is not a battery. Nanotekinstruments, Inc.
and its subsidiaries, Angstronmaterials, Inc. of Ohton, developed New specification, used to design energy storage equipment, depending on the rapid shuttle of a large number of lithium ions in the electrode, this electrode has a large graphene surface. This energy storage device can prove very useful for electric vehicles, which can reduce charging time, shortened from less than a minute from hours.
Other applications may include renewable energy storage (eg, storage solar and wind energy) and smart grids. The researchers said that this new device is a lithium ion exchange battery for graphene surface function, or more simply, surface-mediated battery (SMCS: Surface-Mediatedcells). Although current equipment uses unopened materials and structures, they can already exceed lithium-ion batteries and supercapacitors.
This new device can supply 100 kilowatts per kilowatt of battery, 100 times higher than commercial lithium-ion batteries, 10 times higher than supercapacitor. The higher the power density, the faster the energy transfer speed (can result in a faster charging speed). In addition, this new battery can store the energy density of 160 watts per kilogram of battery, which is comparable to the commercialized lithium-ion battery, 30 times higher than the traditional supercapacitor.
The larger the energy density, the more energy can be stored, the more energy is stored (with a longer driving mileage of electric vehicles). If there is the same equipment weight, the current surface-mediated battery and lithium-ion batteries can be used for electric vehicles, and the founder of Nano Instrument and Angerstron Materials Company Joint founder Jiang Bauz (Borz.jang) It is said that our surface-mediated battery is similar to the current lithium-ion battery, can further increase the energy density, so it can also improve the itinerary.
However, in principle, surface-mediated batteries can be charged in a few minutes (may not be less than one minute), rather than hours, just like the lithium-ion battery used in electric vehicles. Jiang Bauldz and his partner in Nanotechnology Instrument Co., Ltd.
and Angersmia Material Company have published this study, which is the study of next-generation energy storage equipment, published in the most recent "Nano Express "(Nanoletters). Both companies are specializing in the commercialization of nanomaterials, Angerstrong is the world's largest nano-granite (NGPS: Nanographeneplatelets) manufacturer. Just as researchers explain in their research, there are their own strengths and weaknesses in energy storage, batteries and supercapacitors.
Although the energy density of lithium ion batteries (120-150 watt / kg) is much higher than the supercapacitor (5 watt / kg), this battery has a low power density (1 kW / kg battery) , Compare 10 kW / kg battery). Many research teams have made efforts to add the power density of the lithium-ion battery, improve the energy density of the supercapacitor, but these two areas still have major challenges. Because a new framework is supplied, it can be used for energy storage devices, so this surface-mediated battery allows researchers to bypass these challenges.
Develop this new energy storage device, narrowing the gap between the performance of the lithium ion battery and supercapacitor, and Jiang Bauz said. More importantly, this fundamentally new framework for manufacturing energy storage devices, enabling researchers to achieve high energy density, but also high power density, without sacrificing one for another. The surface-mediated battery electrode has a large surface area, so that the large amount of ions quickly shuttle, bringing fast charging time.
Source: The key to the surface-mediated battery performance of the American Chemistry, is the cathode and the anode contain very large graphene surface. When manufacturing batteries, researchers put lithium metal (in the form of particles or metal foil) in the anode. In the first discharge cycle, lithium is ionized, the number of lithium ions brought more than in the lithium ion battery.
When the battery is used, these ions migrate to the cathode through the liquid electrolyte, into the pores of the cathode to reach a large graphene surface in the cathode. During the charging process, a large amount of lithium ion flux quickly migrates from the cathode to the anode. Very large electrode surface area, so that a large amount of ions quickly shuttle, high power and energy density.
The researchers explained that the surface of the porous electrode (rather than in the block electrode, like the battery in the battery), do not consume time consuming insertion process. During this process, lithium ions must be inserted between the electrodes, which constitutes an important battery charging time. In this study, although the researchers used a large number of different types of graphite, different types of graphene (oxidized, reduced single-layer and multi-layer graphene) were prepared, but these materials and configurations were further analyzed to optimize This device.
On the one hand, the researchers plan to further study the cycle life of this battery. So far, they find that these devices can retain 95% capacity after 1000 cycles, even after 2000 cycles, there is still no indication of dendrite. Researchers also plan to discuss, different lithium storage mechanisms relative to equipment performance.
We estimate that the commercialization of the surface-mediated battery technology will not have any big obstacles, and Jiang Bauz said. Although the current graphene is sold in a high price, Angerstron Materials Company is actively expanding the production strength of graphene. It is expected that in the next 1-3 years, the production cost of graphite will be significantly reduced.
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