Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Sticky Composites Improve, 'Green Up' Lithium-Ion Batteries

02.04.2014

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
Further information:
http://www.udel.edu

More articles from Materials Sciences:

nachricht Using Ultrashort Pulsed Laser Radiation to Process Fibre-Reinforced Components
25.07.2016 | Fraunhofer-Institut für Lasertechnik ILT

nachricht Added bacterial film makes new mortar resistant to water uptake
25.07.2016 | Technische Universität München

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Newly discovered material property may lead to high temp superconductivity

Researchers at the U.S. Department of Energy's (DOE) Ames Laboratory have discovered an unusual property of purple bronze that may point to new ways to achieve high temperature superconductivity.

While studying purple bronze, a molybdenum oxide, researchers discovered an unconventional charge density wave on its surface.

Im Focus: Mapping electromagnetic waveforms

Munich Physicists have developed a novel electron microscope that can visualize electromagnetic fields oscillating at frequencies of billions of cycles per second.

Temporally varying electromagnetic fields are the driving force behind the whole of electronics. Their polarities can change at mind-bogglingly fast rates, and...

Im Focus: Continental tug-of-war - until the rope snaps

Breakup of continents with two speed: Continents initially stretch very slowly along the future splitting zone, but then move apart very quickly before the onset of rupture. The final speed can be up to 20 times faster than in the first, slow extension phase.phases

Present-day continents were shaped hundreds of millions of years ago as the supercontinent Pangaea broke apart. Derived from Pangaea’s main fragments Gondwana...

Im Focus: A Peek into the “Birthing Room” of Ribosomes

Scaffolding and specialised workers help with the delivery – Heidelberg biochemists gain new insights into biogenesis

A type of scaffolding on which specialised workers ply their trade helps in the manufacturing process of the two subunits from which the ribosome – the protein...

Im Focus: New protocol enables analysis of metabolic products from fixed tissues

Scientists at the Helmholtz Zentrum München have developed a new mass spectrometry imaging method which, for the first time, makes it possible to analyze hundreds of metabolites in fixed tissue samples. Their findings, published in the journal Nature Protocols, explain the new access to metabolic information, which will offer previously unexploited potential for tissue-based research and molecular diagnostics.

In biomedical research, working with tissue samples is indispensable because it permits insights into the biological reality of patients, for example, in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

GROWING IN CITIES - Interdisciplinary Perspectives on Urban Gardening

15.07.2016 | Event News

SIGGRAPH2016 Computer Graphics Interactive Techniques, 24-28 July, Anaheim, California

15.07.2016 | Event News

Partner countries of FAIR accelerator meet in Darmstadt and approve developments

11.07.2016 | Event News

 
Latest News

The Exception and its Rules

25.07.2016 | Physics and Astronomy

Using Ultrashort Pulsed Laser Radiation to Process Fibre-Reinforced Components

25.07.2016 | Materials Sciences

Added bacterial film makes new mortar resistant to water uptake

25.07.2016 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>