Featured Research

from universities, journals, and other organizations

Promising Lithium Batteries For Electric Cars

Date:
August 11, 2008
Source:
CNRS
Summary:
Why does lithium iron phosphate, a candidate for use in future lithium batteries, conduct electricity despite being an insulating material? Chemists 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 open new horizons in the search for improved battery electrode materials and help explain how tomorrow's electric car batteries work.

The lithium iron phosphate nanoparticles (100 nm) making up the agglomerate are individually transformed though the "domino cascade process" as the battery is charged.
Credit: Copyright ICMCB

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.

Related Articles


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 open new horizons in the search for improved battery electrode materials and help explain how tomorrow's electric car batteries work.

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.


Story Source:

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


Journal Reference:

  1. Delmas et al. Lithium deintercalation in LiFePO4 nanoparticles via a domino-cascade model. Nature Materials, 2008; 7 (8): 665 DOI: 10.1038/nmat2230

Cite This Page:

CNRS. "Promising Lithium Batteries For Electric Cars." ScienceDaily. ScienceDaily, 11 August 2008. <www.sciencedaily.com/releases/2008/08/080807073753.htm>.
CNRS. (2008, August 11). Promising Lithium Batteries For Electric Cars. ScienceDaily. Retrieved November 21, 2014 from www.sciencedaily.com/releases/2008/08/080807073753.htm
CNRS. "Promising Lithium Batteries For Electric Cars." ScienceDaily. www.sciencedaily.com/releases/2008/08/080807073753.htm (accessed November 21, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Friday, November 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

NSA Director: China Can Damage US Power Grid

NSA Director: China Can Damage US Power Grid

AP (Nov. 20, 2014) — China and "one or two" other countries are capable of mounting cyberattacks that would shut down the electric grid and other critical systems in parts of the United States, according to Adm. Michael Rogers, director of the National Security Agency and hea Video provided by AP
Powered by NewsLook.com
Latest Minivan Crash Tests Aren't Pretty

Latest Minivan Crash Tests Aren't Pretty

Newsy (Nov. 20, 2014) — Five minivans were put to the test in head-on crash simulations by the Insurance Institute for Highway Safety. Video provided by Newsy
Powered by NewsLook.com
Takata Offers "sincerest Condolences" To Victims of Malfunctioning Airbag

Takata Offers "sincerest Condolences" To Victims of Malfunctioning Airbag

Reuters - US Online Video (Nov. 20, 2014) — U.S. Congress hears from a victim and company officials as it holds a hearing on the safety of Takata airbags after reports of injuries. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
DARPA Creates The Tech You Can Only Dream Of

DARPA Creates The Tech You Can Only Dream Of

Newsy (Nov. 20, 2014) — Curious what a rocket-dodging car would look like? How about a robotic pack mule? Or maybe a wearable robot? These are a few of DARPA's projects. Video provided by Newsy
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