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release time:2024-10-23 Hits: Popular:AG11 battery
US research says graphene paper can greatly shorten the charging and discharging time of 14250 battery
According to a recent report by the Physicists Organization website, researchers at Rensselaer Polytechnic Institute in the United States made a sheet of graphene, the world's thinnest material, and then used a laser or camera flash to shock it, making it riddled with holes, causing the internal structure of the sheet to expand to allow more electrolyte "wetting" and lithium ions in lithium-ion batteries to obtain high-rate channel performance. This graphene anode material is 10 times faster than the graphite anode commonly used in lithium-ion batteries today, and can drive electric vehicles in the future. Rechargeable lithium-ion batteries are industry-standard products used in a range of devices such as mobile phones, laptops and tablets, and electric vehicles. Lithium-ion batteries have high energy density and can store a lot of energy, but they cannot quickly receive or release energy when they encounter low power density. To solve this problem, the college's nanomaterials expert Nicky led a research team to create a new type of battery that can not only hold a lot of energy, but also receive and release energy quickly. 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 "defective" graphene paper battery in structural design can help overcome these obstacles, researchers said. Once commercialized, this achievement will have a significant impact on the development of new batteries and electrical systems in electric vehicles and portable electronics. This battery can also greatly shorten the time required to charge portable electronic devices and responders such as mobile phones and laptops. The solution for the new battery is to first create a large sheet of graphene oxide paper, which is as thick as a sheet of everyday printing paper and can be made into any size or shape, and then expose the graphene paper to lasers and flashes from digital camera flashes. The heat from the laser or flash penetrates the paper surface to cause tiny explosions, and the oxygen atoms in the graphene oxide are expelled from the structure, and the graphene paper becomes devastated: countless cracks, pores, voids and other defects, and the pressure formed by the escaping oxygen also causes the graphene paper to expand its thickness by 5 times, thereby creating large gaps in a single graphene sheet. The researchers found that this damaged single-layer graphene paper can become the anode of lithium-ion batteries. 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 proved through experiments that the anode material can charge or discharge 10 times faster than the anode in traditional lithium-ion batteries without causing a significant loss in its energy density, and can continue to operate successfully even after more than 1,000 charge/discharge cycles. Also important is that the high conductivity of graphene sheets enables electrons to be efficiently transmitted at the anode. The researchers said that these graphene paper anodes are easy to adjust and can be made into any size and shape, and exposing them to the flash of a laser or camera flash is a simple and inexpensive replication process. Their next step will be to pair a high-power cathode material with the graphene anode material to build a complete battery. The research results were published in the recent American Chemical Society journal ACS Nano.
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