According to a recent report by the physicist organization network, researchers at the Rensselaer Polytechnic Institute in the United States made the world's thinnest material, graphene, into a piece of paper, and then used a flash of laser or camera flash to make it a sore. The hundred-hole shape causes the internal structure of the sheet to be spaced apart to allow more electrolyte "wetting" and lithium ion in the lithium ion battery to achieve high rate channel performance. This graphene anode material is 10 times faster than the graphite anodes used in today's lithium-ion batteries, and can drive electric vehicles in the future. Rechargeable lithium-ion batteries are used as industry-specific products for a range of devices such as cell phones, laptops and tablets, and electric vehicles. Lithium-ion batteries have a high energy density and can store a large amount of energy, but they cannot receive or release energy quickly when subjected to low power density. To solve this problem, the college's nanomaterials expert Nikki led the research team to create a new type of battery that not only can hold a lot of energy, but also quickly receive and release energy. Researchers say that the main obstacles to lithium-ion battery technology are limited power density and the inability to quickly receive or release large amounts of energy, and this graphene paper battery with "defects" in design can help overcome these obstacles. Once commercialized, the results will have a significant impact on the development of new batteries and electrical systems in electric vehicles and portable electronics. The battery also greatly reduces the time required to charge portable electronic devices such as mobile phones and laptops and responders. The solution for the new battery is to create a large piece of graphene oxide paper that is as thick as a piece of everyday paper and can be made in any size or shape, then exposed the graphene paper to a laser and a digital camera flash. Under the flash. The heat of the laser or flash penetrates the paper surface and causes a slight explosion. The oxygen atoms in the graphene oxide are expelled from the structure, and the graphene paper becomes devastated: numerous cracks, pores, voids, etc., and the pressure of the escaped oxygen The graphene paper was enlarged by a factor of five, thereby creating a large gap in a single graphene sheet. The researchers found that the damaged single-layer graphene paper can be the anode of a lithium-ion battery. Lithium ions use these cracks and pores as shortcuts to quickly move in and out of graphene, greatly improving the overall power density of the battery. . They have experimentally proved that the anode material is 10 times faster than the anode in a conventional lithium-ion battery, without causing a significant loss of its energy density, and can continue to operate successfully even after more than 1000 charge/discharge cycles. . It is also important that the high conductivity of the graphene sheets allows electrons to be efficiently transported at the anode. The graphene paper anodes are easy to adjust, can be made in any size and shape, and exposed to the flash of a laser or camera flash is a simple, inexpensive process of replication. They will next use a high-power cathode material paired with the anode material of graphene to build a complete battery. The findings were published in the recent issue of the American Chemical Society's ACS Nano.
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