Featured Research

from universities, journals, and other organizations

Energy storage technology: More pores for more power

Date:
June 30, 2014
Source:
Ludwig-Maximilians-Universitaet Muenchen (LMU)
Summary:
When can we expect to drive the length of Germany in an electric car without having to top up the battery? Chemists have now synthesized a new material that could show the way forward to state-of-the-art lithium-sulfur batteries.

When can we expect to drive the length of Germany in an electric car without having to top up the battery? Chemists at the NIM Cluster at Ludwig-Maximilians-Universitaet (LMU) in Munich and at the University of Waterloo in Ontario, Canada, have now synthesized a new material that could show the way forward to state-of-the-art lithium-sulfur batteries.

Whether or not the future of automotive traffic belongs to the softly purring electric car depends largely on the development of its batteries. The industry is currently placing most of its hopes in lithium-sulfur batteries, which have a very high storage capacity. Moreover, thanks to the inclusion of sulfur atoms, they are cheaper to make and less toxic than conventional lithium-ion power packs.

However, the lithium-sulfur battery still presents several major challenges that need to be resolved until it can be integrated into cars. For example, both the rate and the number of possible charge-discharge cycles need to be increased before the lithium-sulfur battery can become a realistic alternative to lithium-ion batteries.

Lots of pores for sulfur

The chemists Professor Thomas Bein (LMU), Coordinator of the Energy Conversion Division of the Nanosystems Initiative Munich, Professor Linda Nazar (University of Waterloo, Waterloo Institute of Nanotechology) and their colleagues have now succeeded in producing a novel type of nanofiber, whose highly ordered and porous structure gives it an extraordinarily high surface-to-volume ratio. Thus, a sample of the new material the size of a sugar cube presents a surface area equivalent to that of more than seven tennis courts.

“The high surface-to-volume ratio, and high pore volume is important because it allows sulfur to bind to the electrode in a finely divided manner, with relatively high loading. Together with its easy accessibility, this enhances the efficiency of the electrochemical processes that occur in the course of charge-discharge cycles. And the rates of the key reactions at the sulfur electrode-electrolyte interface, which involve both electrons and ions, are highly dependent on the total surface area available,” as Benjamin Mandlmeier, a postdoc in Bein’s Institute and a first co-author on the new study, explains.

The secret recipe

A novel recipe and a cleverly designed mode of synthesis are the key factors that determine the properties of the new materials. To synthesize the carbon fibers, the chemists first prepare a porous, tubular silica template, starting from commercially available, but non-porous fibers. This template is then filled with a special mixture of carbon, silicon dioxide and surfactants, which is then heated at 900°C. Finally the template and the SiO2 are removed by an etching process. During the procedure, the carbon nanotubes – and thus the pore size – shrink to a lesser extent than they would in the absence of the confining template, and the fibers themselves are correspondingly more stable.

“Nanostructured materials have great potential for the efficient conversion and storage of electrical energy,” says Thomas Bein. “We in the NIM Cluster will continue to collaborate closely with our colleagues in the Bavarian SolTech Network in order to explore and exploit the properties of such structures and their practical applications.”


Story Source:

The above story is based on materials provided by Ludwig-Maximilians-Universitaet Muenchen (LMU). Note: Materials may be edited for content and length.


Journal Reference:

  1. Guang He, Benjamin Mandlmeier, Jörg Schuster, Linda F. Nazar, Thomas Bein. Bimodal Mesoporous Carbon Nanofibers with High Porosity: Freestanding and Embedded in Membranes for Lithium–Sulfur Batteries. Chemistry of Materials, 2014; 140618153048006 DOI: 10.1021/cm403740r

Cite This Page:

Ludwig-Maximilians-Universitaet Muenchen (LMU). "Energy storage technology: More pores for more power." ScienceDaily. ScienceDaily, 30 June 2014. <www.sciencedaily.com/releases/2014/06/140630124335.htm>.
Ludwig-Maximilians-Universitaet Muenchen (LMU). (2014, June 30). Energy storage technology: More pores for more power. ScienceDaily. Retrieved July 29, 2014 from www.sciencedaily.com/releases/2014/06/140630124335.htm
Ludwig-Maximilians-Universitaet Muenchen (LMU). "Energy storage technology: More pores for more power." ScienceDaily. www.sciencedaily.com/releases/2014/06/140630124335.htm (accessed July 29, 2014).

Share This




More Matter & Energy News

Tuesday, July 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Baluchistan Mining Eyes an Uncertain Future

Baluchistan Mining Eyes an Uncertain Future

AFP (July 29, 2014) — Coal mining is one of the major industries in Baluchistan but a lack of infrastructure and frequent accidents mean that the area has yet to hit its potential. Duration: 01:58 Video provided by AFP
Powered by NewsLook.com
Easier Nuclear Construction Promises Fall Short

Easier Nuclear Construction Promises Fall Short

AP (July 29, 2014) — The U.S. nuclear industry started building its first new plants using prefabricated Lego-like blocks meant to save time and prevent the cost overruns that crippled the sector decades ago. So far, it's not working. (July 29) Video provided by AP
Powered by NewsLook.com
Lithium Battery 'Holy Grail' Could Provide 4 Times The Power

Lithium Battery 'Holy Grail' Could Provide 4 Times The Power

Newsy (July 28, 2014) — Stanford University published its findings for a "pure" lithium ion battery that could have our everyday devices and electric cars running longer. Video provided by Newsy
Powered by NewsLook.com
The Carbon Trap: US Exports Global Warming

The Carbon Trap: US Exports Global Warming

AP (July 28, 2014) — AP Investigation: As the Obama administration weans the country off dirty fuels, energy companies are ramping-up overseas coal exports at a heavy price. (July 28) Video provided by AP
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