Lithium-ion batteries power a vast array of modern devices, from cell phones, laptops, and laser pointers to thermometers, hearing aids, and pacemakers. The electrodes in these batteries typically comprise three components: active materials, conductive additives, and binders.
Now, a team of researchers at the University of Delaware has discovered a “sticky” conductive material that may eliminate the need for binders.
University of Delaware
Bingqing Wei leads a research team at the University of Delaware that has discovered that fragmented carbon nanotube films can serve as adhesive conductors in lithium-ion batteries.
“The problem with the current technology is that the binders impair the electrochemical performance of the battery because of their insulating properties,” says Bingqing Wei, professor of mechanical engineering.
“Furthermore, the organic solvents used to mix the binders and conductive materials together not only add to the expense of the final product, but also are toxic to humans.”
Carbon nanotubes to the rescue.
Wei and doctoral student Zeyuan Cao recently discovered that fragmented carbon nanotube macrofilms (FCNT) can serve as adhesive conductors, combining two functions in one material. Their work is reported in ACS Nano, a specialty publication of the American Chemical Society, and they have filed a patent application on the discovery.
Wei explains that FCNTs are web-like meshes with “tentacles” that are coupled with active lithium-based cathode and anode materials. They are then assembled using simple ultrasound processing. The process employs no organic solvents.
“We’ve found that the adhesive FCNT conductors actually have higher adhesion strength than PVDF, the binder traditionally used in lithium-ion battery manufacturing,” he says. “We’ve also demonstrated that these composite electrodes exhibit higher electrical conductivity than traditional materials, and we’ve achieved these benefits in a low-cost green fabrication process that replaces toxic organic solvents with just water and alcohol.”
“There is a wide market for lithium-ion batteries,” he adds, “and we see great potential for the use of this technology in vehicle applications, where quick charging and discharging are required.”
The approach strategy could also be employed for electrode preparation for other energy storage devices such as electrochemical capacitors.
Bingqing Wei | newswise
Controlling phase changes in solids
29.07.2015 | ICFO-The Institute of Photonic Sciences
Smart Hydrogel Coating Creates “Stick-slip” Control of Capillary Action
28.07.2015 | Georgia Institute of Technology
Physicists from Regensburg and Marburg, Germany have succeeded in taking a slow-motion movie of speeding electrons in a solid driven by a strong light wave. In the process, they have unraveled a novel quantum phenomenon, which will be reported in the forthcoming edition of Nature.
The advent of ever faster electronics featuring clock rates up to the multiple-gigahertz range has revolutionized our day-to-day life. Researchers and...
Researchers have developed an ultrafast light-emitting device that can flip on and off 90 billion times a second and could form the basis of optical computing.
Joint BioEnergy Institute study identifies bacterial protein that is key to protecting rice against bacterial blight
A bacterial signal that when recognized by rice plants enables the plants to resist a devastating blight disease has been identified by a multi-national team...
Researchers in the Cockrell School of Engineering at The University of Texas at Austin are one step closer to delivering smart windows with a new level of energy efficiency, engineering materials that allow windows to reveal light without transferring heat and, conversely, to block light while allowing heat transmission, as described in two new research papers.
By allowing indoor occupants to more precisely control the energy and sunlight passing through a window, the new materials could significantly reduce costs for...
Argonne scientists used Mira to identify and improve a new mechanism for eliminating friction, which fed into the development of a hybrid material that exhibited superlubricity at the macroscale for the first time. Argonne Leadership Computing Facility (ALCF) researchers helped enable the groundbreaking simulations by overcoming a performance bottleneck that doubled the speed of the team's code.
While reviewing the simulation results of a promising new lubricant material, Argonne researcher Sanket Deshmukh stumbled upon a phenomenon that had never been...
23.07.2015 | Event News
10.07.2015 | Event News
25.06.2015 | Event News
30.07.2015 | Life Sciences
30.07.2015 | Health and Medicine
30.07.2015 | Life Sciences