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Lithium Batteries' Energy Can Be Tripled Using Carbon Nanotubes.
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Posted by Okachinepa on 12/09/2024 @
Courtesy of SynEvol
Credit:Preety Ahuja
Twisted carbon nanotubes can store three times as much energy per unit mass as sophisticated lithium-ion batteries, according to a global team of scientists that includes two researchers from the University of Maryland Baltimore County's Center for sophisticated Sensor Technology (CAST). This innovation makes carbon nanotubes a viable option for energy storage in small, light, and secure devices such as sensors and medical implants. Nature Nanotechnology recently published the results.
Sanjeev Kumar Ujjain from CAST, Katsumi Kaneko from Shinshu University in Nagano, Japan, and Shigenori Utsumi from Suwa University of Science in Chino, Japan, led the four universities that collaborated on the project. The project was started at Shinshu University by Kumar Ujjain, who carried on working on it after joining UMBC in 2022. Another CAST employee, Preety Ahuja, was essential in the research's material characterisation stage.
Single-walled carbon nanotubes, which resemble straws and are composed of pure carbon sheets that are just one atom thick, were the subject of the study. About 100 times stronger than steel, carbon nanotubes are also lightweight and reasonably simple to make. Because of their remarkable qualities, scientists are investigating how they may be used in a variety of futuristic-sounding technologies, such as space elevators.
The researchers at UMBC and its associates created carbon nanotube "ropes" using bundles of commercially available nanotubes in order to study the potential of carbon nanotubes for energy storage. The researchers coated the tubes with various materials meant to improve the strength and flexibility of the ropes after pulling and twisting them into a single thread.
The researchers calculated how much energy they could store by twisting the ropes up and measuring the energy released as they unfolded. The best-performing ropes were found to hold 15,000 times the energy per unit mass of steel springs and nearly three times the energy of lithium-ion batteries. At temperatures between -76 and +212 °F (-60 and +100 °C), the stored energy is stable and accessible. Furthermore, the carbon nanotube ropes are safer for human health than the materials used in batteries.
According to Kumar Ujjain, "mechanical coil springs have long been used by humans to store energy and power devices like watches and toys." “This research shows twisted carbon nanotubes have great potential for mechanical energy storage, and we are excited to share the news with the world.” He says the CAST team is already working to incorporate twisted carbon nanotubes as an energy source for a prototype sensor they are developing.
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