Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Promising lithium batteries for electric cars

© ICMCB

The lithium iron phosphate nanoparticles (100 nm) making up the agglomerate are individually transformed though the “domino cascade process” as the battery is charged.
© ICMCB
The lithium iron phosphate nanoparticles (100 nm) making up the agglomerate are individually transformed though the “domino cascade process” as the battery is charged.

Abstract:
Why does lithium iron phosphate, a candidate for use in future lithium batteries, conduct electricity despite being an insulating material? Chemists at CNRS (1), working in collaboration with a team from CEA-Liten (2), have shed light on this paradox. Their experimentally verified "domino-cascade model" shows that local stresses within the material allow electrical and ionic conduction to spread from one area to the next, making the battery function. These results, published in the August issue of Nature Materials, open new horizons in the search for improved battery electrode materials and help explain how tomorrow's electric car batteries work.

Promising lithium batteries for electric cars

France | Posted on August 2nd, 2008

Lithium-ion batteries, which store three to four times more energy per unit mass than traditional batteries, are now used extensively in portable electronic devices (computers, cell phones, MP3 players, etc.). The positive electrode materials in these batteries are highly effective but too expensive to be used in the large batteries needed for electric vehicles and second generation hybrid vehicles. In the future, these applications may rely on lithium iron phosphate: it is environmentally friendly and has exceptional properties combined with low cost and good thermal stability (important for safety reasons). All these qualities make it the best candidate to be used in lithium batteries for future electric cars. However, this material does not have the ionic and electrical conduction properties needed to make the electrode work.

CNRS chemists from the Institut de chimie de la matière condensée de Bordeaux (ICMCB) and their partners from CEA-Liten became the first to explain this paradox. By studying lithium iron phosphate, they showed that the battery's charge-discharge cycles are made possible by a "domino cascade process." This phenomenon occurs as soon as stresses are present at the interface between the discharging material and the material in the discharged state. Electrical and ionic conduction is then extremely rapid in the interfacial zone, propagating from one spot to the next like dominos as the interface moves. The model has been verified by microscopic measurements.

This novel reaction process, resembling a wave sweeping through the crystal, explains how two insulating materials (one in the charged state and the other in the discharged state) can nonetheless make lithium-ion batteries function. These results are an important step forward in the quest for new low cost and safer electrode materials for future lithium batteries. The research has also made it possible to understand the processes taking place at the nanometer scale in lithium iron phosphate-based batteries, which may be used in tomorrow's hybrid and electric cars.

Notes:

(1) Institut de chimie de la matière condensée de Bordeaux, ICMCB, (CNRS / Université de Bordeaux / ENSCPB).

(2) CEA-Liten : Laboratoire d'innovation pour les technologies des énergies nouvelles et les nanomatériaux.
References:

Lithium deintercalation in LiFePO4 nanoparticles via a domino-cascade model, C. Delmas, M. Maccario, L. Croguennec, F. Le Cras, F. Weill, Nature Materials, August 2008.

####

About CNRS
The Centre National de la Recherche Scientifique (National Center for Scientific Research) is a government-funded research organization, under the administrative authority of France's Ministry of Research.

Founded in 1939 by governmental decree, CNRS has the following missions:

* To evaluate and carry out all research capable of advancing knowledge and bringing social, cultural, and economic benefits for society
* To contribute to the application and promotion of research results
* To develop scientific information
* To support research training
* To participate in the analysis of the national and international scientific climate and its potential for evolution in order to develop a national policy

For more information, please click here

Contacts:
Researchers
Claude Delmas (CNRS)
+33 6 80 11 06 84



Sébastien Martinet (CEA)
04 38 78 57 11



Public Information Officers
Céline Lipari (CNRS)
01 44 96 51 51


Stéphane Laveissière (CEA)
01 64 50 27 53

Copyright © CNRS

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

A new approach to ultrafast light pulses: Unusual fluorescent materials could be used for rapid light-based communications systems September 19th, 2017

New quantum phenomena in graphene superlattices September 18th, 2017

Do titanium dioxide particles from orthopedic implants disrupt bone repair? September 16th, 2017

Hydrogen power moves a step closer: Physicists are developing methods of creating renewable fuel from water using quantum technology September 15th, 2017

Discoveries

A new approach to ultrafast light pulses: Unusual fluorescent materials could be used for rapid light-based communications systems September 19th, 2017

New quantum phenomena in graphene superlattices September 18th, 2017

Do titanium dioxide particles from orthopedic implants disrupt bone repair? September 16th, 2017

Hydrogen power moves a step closer: Physicists are developing methods of creating renewable fuel from water using quantum technology September 15th, 2017

Announcements

A new approach to ultrafast light pulses: Unusual fluorescent materials could be used for rapid light-based communications systems September 19th, 2017

New quantum phenomena in graphene superlattices September 18th, 2017

Do titanium dioxide particles from orthopedic implants disrupt bone repair? September 16th, 2017

Hydrogen power moves a step closer: Physicists are developing methods of creating renewable fuel from water using quantum technology September 15th, 2017

Automotive/Transportation

More durable, less expensive fuel cells: University of Delaware researchers have developed a new technology that could speed up the commercialization of fuel cell vehicles September 5th, 2017

High-tech electronics made from autumn leaves: New process converts biomass waste into useful electronic devices August 30th, 2017

Nanoparticles pollution rises 30 percent when flex-fuel cars switch from bio to fossil: Study carried out in São Paulo, home to the world's largest flex fuel urban fleet, shows increase of ultrafine particulate matter when ethanol prices rose and consumption fell August 28th, 2017

2-faced 2-D material is a first at Rice: Rice University materials scientists create flat sandwich of sulfur, molybdenum and selenium August 14th, 2017

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project