Featured Research

from universities, journals, and other organizations

Breakthrough in rechargeable batteries: New twist to sodium-ion battery technology

Date:
January 29, 2014
Source:
Kansas State University
Summary:
Engineers have made a breakthrough in rechargeable battery applications. They have demonstrated that a composite paper -- made of interleaved molybdenum disulfide and graphene nanosheets -- can be both an active material to efficiently store sodium atoms and a flexible current collector. The newly developed composite paper can be used as a negative electrode in sodium-ion batteries.

A Kansas State University engineer has made a breakthrough in rechargeable battery applications. The bottom image shows a self-standing molybdenum disulfide/graphene composite paper electrode and the top image highlights its layered structure.
Credit: Gurpreet Singh

A Kansas State University engineer has made a breakthrough in rechargeable battery applications.

Gurpreet Singh, assistant professor of mechanical and nuclear engineering, and his student researchers are the first to demonstrate that a composite paper -- made of interleaved molybdenum disulfide and graphene nanosheets -- can be both an active material to efficiently store sodium atoms and a flexible current collector. The newly developed composite paper can be used as a negative electrode in sodium-ion batteries.

"Most negative electrodes for sodium-ion batteries use materials that undergo an 'alloying' reaction with sodium," Singh said. "These materials can swell as much as 400 to 500 percent as the battery is charged and discharged, which may result in mechanical damage and loss of electrical contact with the current collector."

"Molybdenum disulfide, the major constituent of the paper electrode, offers a new kind of chemistry with sodium ions, which is a combination of intercalation and a conversion-type reaction," Singh said. "The paper electrode offers stable charge capacity of 230 mAh.g-1, with respect to total electrode weight. Further, the interleaved and porous structure of the paper electrode offers smooth channels for sodium to diffuse in and out as the cell is charged and discharged quickly. This design also eliminates the polymeric binders and copper current collector foil used in a traditional battery electrode."

The research appears in the latest issue of the journal ACS Nanoin the article "MoS2/graphene composite paper for sodium-ion battery electrodes."

For the last two years the researchers have been developing new methods for quick and cost-effective synthesis of atomically thin two-dimensional materials -- graphene, molybdenum and tungsten disulfide -- in gram quantities, particularly for rechargeable battery applications.

For the latest research, the engineers created a large-area composite paper that consisted of acid-treated layered molybdenum disulfide and chemically modified graphene in an interleaved structured. The research marks the first time that such a flexible paper electrode was used in a sodium-ion battery as an anode that operates at room temperature. Most commercial sodium-sulfur batteries operate close to 300 degrees Celsius, Singh said.

Singh said the research is important for two reasons:

1. Synthesis of large quantities of single or few-layer-thick 2-D materials is crucial to understanding the true commercial potential of materials such as transition metal dichalcogenides, or TMD, and graphene.

2. Fundamental understanding of how sodium is stored in a layered material through mechanisms other than the conventional intercalation and alloying reaction. In addition, using graphene as the flexible support and current collector is crucial for eliminating the copper foil and making lighter and bendable rechargeable batteries. In contrast to lithium, sodium supplies are essentially unlimited and the batteries are expected to be a lot cheaper.

"From the synthesis point of view, we have shown that certain transition metal dichalcogenides can be exfoliated in strong acids," Singh said. "This method should allow synthesis of gram quantities of few-layer-thick molybdenum disulfide sheets, which is very crucial for applications such as flexible batteries, supercapacitors, and polymer composites. For such applications, TMD flakes that are a few atoms thick are sufficient. Very high-quality single-layer flakes are not a necessity."

The researchers are working to commercialize the technology, with assistance from the university's Institute of Commercialization. They also are exploring lithium and sodium storage in other nanomaterials.

Other Kansas State University researchers involved in the project include Lamuel David, lead author on the paper and a doctoral student in mechanical engineering, India, and Romil Bhandavat, recent doctoral graduate.


Story Source:

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


Journal Reference:

  1. Lamuel David, Romil Bhandavat, Gurpreet Singh. MoS2/Graphene Composite Paper for Sodium-Ion Battery Electrodes. ACS Nano, 2014; 140127143945002 DOI: 10.1021/nn406156b

Cite This Page:

Kansas State University. "Breakthrough in rechargeable batteries: New twist to sodium-ion battery technology." ScienceDaily. ScienceDaily, 29 January 2014. <www.sciencedaily.com/releases/2014/01/140129164648.htm>.
Kansas State University. (2014, January 29). Breakthrough in rechargeable batteries: New twist to sodium-ion battery technology. ScienceDaily. Retrieved September 17, 2014 from www.sciencedaily.com/releases/2014/01/140129164648.htm
Kansas State University. "Breakthrough in rechargeable batteries: New twist to sodium-ion battery technology." ScienceDaily. www.sciencedaily.com/releases/2014/01/140129164648.htm (accessed September 17, 2014).

Share This



More Matter & Energy News

Wednesday, September 17, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Space Race Pits Bezos Vs Musk

Space Race Pits Bezos Vs Musk

Reuters - Business Video Online (Sep. 16, 2014) Amazon CEO Jeff Bezos' startup will team up with Boeing and Lockheed to develop rocket engines as Elon Musk races to have his rockets certified. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
MIT's Robot Cheetah Unleashed — Can Now Run, Jump Freely

MIT's Robot Cheetah Unleashed — Can Now Run, Jump Freely

Newsy (Sep. 16, 2014) MIT developed a robot modeled after a cheetah. It can run up to speeds of 10 mph, though researchers estimate it will eventually reach 30 mph. Video provided by Newsy
Powered by NewsLook.com
Manufacturer Prints 3-D Car In Record Time

Manufacturer Prints 3-D Car In Record Time

Newsy (Sep. 15, 2014) Automobile manufacturer Local Motors created a drivable electric car using a 3-D printer. Printing the body only took 44 hours. Video provided by Newsy
Powered by NewsLook.com
Refurbished New York Subway Tunnel Unveiled After Sandy Damage

Refurbished New York Subway Tunnel Unveiled After Sandy Damage

Reuters - US Online Video (Sep. 15, 2014) New York officials unveil subway tunnels that were refurbished after Superstorm Sandy. Nathan Frandino reports. Video provided by Reuters
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