Featured Research

from universities, journals, and other organizations

Sticky composites improve, 'green up' lithium-ion batteries: New battery technology employs multifunctional materials

Date:
March 31, 2014
Source:
University of Delaware
Summary:
Lithium-ion batteries power a vast array of modern devices, from cell phones, laptops, and laser pointers to thermometers, hearing aids, and pacemakers. Scientists have now discovered a “sticky” conductive material that may improve them while eliminating the need for toxic solvents.

Researchers at the University of Delaware have discovered that fragmented carbon nanotube films can serve as adhesive conductors in lithium-ion batteries.
Credit: Image courtesy of University of Delaware

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.

"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.


Story Source:

The above story is based on materials provided by University of Delaware. Note: Materials may be edited for content and length.


Journal Reference:

  1. Zeyuan Cao, Bingqing Wei. Fragmented Carbon Nanotube Macrofilms as Adhesive Conductors for Lithium-Ion Batteries. ACS Nano, 2014; 8 (3): 3049 DOI: 10.1021/nn500585g

Cite This Page:

University of Delaware. "Sticky composites improve, 'green up' lithium-ion batteries: New battery technology employs multifunctional materials." ScienceDaily. ScienceDaily, 31 March 2014. <www.sciencedaily.com/releases/2014/03/140331095552.htm>.
University of Delaware. (2014, March 31). Sticky composites improve, 'green up' lithium-ion batteries: New battery technology employs multifunctional materials. ScienceDaily. Retrieved August 22, 2014 from www.sciencedaily.com/releases/2014/03/140331095552.htm
University of Delaware. "Sticky composites improve, 'green up' lithium-ion batteries: New battery technology employs multifunctional materials." ScienceDaily. www.sciencedaily.com/releases/2014/03/140331095552.htm (accessed August 22, 2014).

Share This




More Matter & Energy News

Friday, August 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Flower Power! Dandelions Make Car Tires?

Flower Power! Dandelions Make Car Tires?

Reuters - Business Video Online (Aug. 20, 2014) Forget rolling on rubber, could car drivers soon be traveling on tires made from dandelions? Teams of scientists are racing to breed a type of the yellow flower whose taproot has a milky fluid with tire-grade rubber particles in it. As Joanna Partridge reports, global tire makers are investing millions in research into a new tire source. Video provided by Reuters
Powered by NewsLook.com
Awesome New Camouflage Sheet Was Inspired By Octopus Skin

Awesome New Camouflage Sheet Was Inspired By Octopus Skin

Newsy (Aug. 19, 2014) Scientists have developed a new device that mimics the way octopuses blend in with their surroundings to hide from dangerous predators. Video provided by Newsy
Powered by NewsLook.com
Researcher Testing on-Field Concussion Scanners

Researcher Testing on-Field Concussion Scanners

AP (Aug. 19, 2014) Four Texas high school football programs are trying out an experimental system designed to diagnose concussions on the field. The technology is in response to growing concern over head trauma in America's most watched sport. (Aug. 19) Video provided by AP
Powered by NewsLook.com
Green Power Blooms as Japan Unveils 'hydrangea Solar Cell'

Green Power Blooms as Japan Unveils 'hydrangea Solar Cell'

AFP (Aug. 19, 2014) A solar cell that resembles a flower is offering a new take on green energy in Japan, where one scientist is searching for renewables that look good. Duration: 01:29 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins