Featured Research

from universities, journals, and other organizations

Inexpensive material boosts battery capacity

Date:
October 24, 2013
Source:
The Agency for Science, Technology and Research (A*STAR)
Summary:
Next-generation lithium-ion batteries made with iron oxide nanoparticles could extend the driving distance of electric cars.

Next-generation lithium-ion batteries made with iron oxide nanoparticles could extend the driving distance of electric cars.

Related Articles


Battery-powered cars offer many environmental benefits, but a car with a full tank of gasoline can travel further. By improving the energy capacity of lithium-ion batteries, a new electrode made from iron oxide nanoparticles could help electric vehicles to cover greater distances.

Developed by Zhaolin Liu of the A*STAR Institute of Materials Research and Engineering, Singapore, and Aishui Yu of Fudan University, China, and co-workers, the electrode material is inexpensive, suitable for large-scale manufacturing and can store higher charge densities than the conventional electrodes used in lithium-ion batteries1.

These batteries store and release energy by shuttling lithium ions between two electrodes connected in a circuit. During charging, lithium ions escape from the cathode, which is made from materials such as lithium cobalt oxide. The ions migrate through a liquid electrolyte and into the anode, which is usually made of graphite riddled with tiny pores. When the battery discharges, the process runs in reverse, generating an electrical current between the electrodes.

Iron oxides have a much higher charging capacity than graphite, but the process is slow. Forcing lithium ions into the material also changes its volume, destroying the anode after just a few charging cycles.

Liu, Yu and team reasoned that an anode made from iron oxide nanoparticles would charge more quickly, because its pores would give ready access to lithium ions. The pores may also allow the material's structure to change as the ions pack inside.

The researchers made 5-nanometer-wide particles of an iron oxide known as α-Fe2O3, simply by heating iron nitrate in water. They mixed the particles with a dust called carbon black, bound them together with polyvinylidene fluoride and coated the mixture onto copper foil to make their anodes.

During the first round of charging and discharging, the anodes showed an efficiency of 75-78%, depending on the current density used. After ten more cycles, however, the efficiency improved to 98%, almost as high as commercial lithium-ion batteries. Research by other teams suggests that during the first few cycles, the iron oxide nanoparticles are broken down until they reach an optimum size.

After 230 cycles the anode's efficiency remained at 97%, with a capacity of 1,009 milliamp hours per gram (mA h g−1 ) -- almost three times greater than commercial graphite anodes. The material experienced none of the degradation problems that have plagued other iron oxide anodes.

The team is now working to optimize the nanoparticle synthesis and increase the efficiency of the anode's initial charging cycles.

The A*STAR-affiliated researchers contributing to this research are from the Institute of Materials Research and Engineering


Story Source:

The above story is based on materials provided by The Agency for Science, Technology and Research (A*STAR). Note: Materials may be edited for content and length.


Journal Reference:

  1. Jingjing Zhang, Tao Huang, Zhaolin Liu, Aishui Yu. Mesoporous Fe2O3 nanoparticles as high performance anode materials for lithium-ion batteries. Electrochemistry Communications, 2013; 29: 17 DOI: 10.1016/j.elecom.2013.01.002

Cite This Page:

The Agency for Science, Technology and Research (A*STAR). "Inexpensive material boosts battery capacity." ScienceDaily. ScienceDaily, 24 October 2013. <www.sciencedaily.com/releases/2013/10/131024114119.htm>.
The Agency for Science, Technology and Research (A*STAR). (2013, October 24). Inexpensive material boosts battery capacity. ScienceDaily. Retrieved January 30, 2015 from www.sciencedaily.com/releases/2013/10/131024114119.htm
The Agency for Science, Technology and Research (A*STAR). "Inexpensive material boosts battery capacity." ScienceDaily. www.sciencedaily.com/releases/2013/10/131024114119.htm (accessed January 30, 2015).

Share This


More From ScienceDaily



More Matter & Energy News

Friday, January 30, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Tesla 'Insane Mode' Gives Unsuspecting Passengers the Ride of Their Life

Tesla 'Insane Mode' Gives Unsuspecting Passengers the Ride of Their Life

RightThisMinute (Jan. 29, 2015) — If your car has an "Insane Mode" then you know it&apos;s fast. Well, these unsuspecting passengers were in for one insane ride when they hit the button. Tesla cars are awesome. Video provided by RightThisMinute
Powered by NewsLook.com
Now Bill Gates Is 'Concerned' About Artificial Intelligence

Now Bill Gates Is 'Concerned' About Artificial Intelligence

Newsy (Jan. 29, 2015) — Bill Gates joins the list of tech moguls scared of super-intelligent machines. He says more people should be concerned, but why? Video provided by Newsy
Powered by NewsLook.com
Senate Passes Bill for Keystone XL Pipeline

Senate Passes Bill for Keystone XL Pipeline

AP (Jan. 29, 2015) — The Republican-controlled Senate has passed a bipartisan bill approving construction of the Keystone XL oil pipeline. (Jan. 29) Video provided by AP
Powered by NewsLook.com
Two Stunt Pilots Perform Incredibly Close Flyby

Two Stunt Pilots Perform Incredibly Close Flyby

Rumble (Jan. 29, 2015) — Two pilots from &apos;Escuadrilla Argentina de Acrobacia Aιrea&apos; perform an incredibly low altitude flyby stunt during a recent show exhibition in Argentina. Check it out! Video provided by Rumble
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:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

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