Featured Research

from universities, journals, and other organizations

Making Lithium-ion Batteries For Mobile Devices More Efficient

Date:
January 11, 2008
Source:
Wiley-Blackwell
Summary:
Scientists report on the characterization of the most conductive representative of the man-made argyrodite minerals made of lithium, phosphorus, sulfur, and bromine atoms, a potential material for lithium-ion batteries used in mobile devices.

Mobile phones, notebook computers, iPods—the boom in portable computing and communications devices is dependent on rechargeable lithium-ion batteries to deliver power. These batteries offer the highest energy density, allow laptops to function for useful amounts of time, and do not display a memory effect when compared to other types of rechargeable batteries. However, modern rechargeable batteries are still not truly satisfactory.

Modern, efficient, rechargeable batteries and fuel cells require materials with an enhanced ability to conduct lithium ions. German researchers have now developed a new class of inorganic ionic conductor with a structure analogous to that of the mineral argyrodite. A team led by Hans-Jφrg Deiseroth in Siegen, Germany reports, in the journal Angewandte Chemie, the characterization of the most conductive representative of the man-made argyrodite minerals made of lithium, phosphorus, sulfur, and bromine atoms.

In ionic conductors, charge is not transported in the form of electrons as it is in metals; instead, the charge is transported in the form of charged particles—typically, lithium ions. This transport requires materials in which the lithium ions can move as freely as possible. The team from the University of Siegen, in cooperation with scientists at the University of Mόnster, started from a long-known mineral: argyrodite is a silver-, germanium-, and sulfur-containing mineral discovered near Freiberg, Germany in 1885 and the silver ions in this material are very mobile.

The individual components of argyrodite can be replaced by a number of other atoms without altering the typical structure of the mineral. The term argyrodite now refers to an entire class of compounds that have a specific arrangement of atoms and type of structure. The team led by Deiseroth produced a version of the mineral in which silver is replaced by lithium, germanium by phosphorus, and some of the sulfur atoms by halides (chloride, bromide, or iodide), resulting in argyrodite-like structures that have a composition of Li6PS5X (X: Cl-, Br-, or I-)

In the crystal lattice the phosphorus, sulfur, and halide atoms adopt a dense tetrahedral packing arrangment in which the gaps are filled somewhat regularly with lithium ions. The lithium ions can “jump” from gap to gap. The freely moving ions indicate that the solid has a high ionic conductivity and the reported bromine-containing structure has the highest ionic conductivity of lithium ions known for any argyrodite to date.

The scientists have thoroughly examined the lithium argyrodites by single-crystal X-ray crystallography and nuclear magnetic resonance spectroscopy. This analysis allowed precise characterization of the crystal structures of these compounds and provided fascinating insights into the dynamics of the mobile lithium ions.

Journal article: Li6PS5X: A Class of Crystalline Li-Rich Solids With an Unusually High Li+ Mobility. Angewandte Chemie International Edition 2008, 47, 755–758. doi: 10.1002/anie.200703900


Story Source:

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


Cite This Page:

Wiley-Blackwell. "Making Lithium-ion Batteries For Mobile Devices More Efficient." ScienceDaily. ScienceDaily, 11 January 2008. <www.sciencedaily.com/releases/2008/01/080103101131.htm>.
Wiley-Blackwell. (2008, January 11). Making Lithium-ion Batteries For Mobile Devices More Efficient. ScienceDaily. Retrieved July 30, 2014 from www.sciencedaily.com/releases/2008/01/080103101131.htm
Wiley-Blackwell. "Making Lithium-ion Batteries For Mobile Devices More Efficient." ScienceDaily. www.sciencedaily.com/releases/2008/01/080103101131.htm (accessed July 30, 2014).

Share This




More Matter & Energy News

Wednesday, July 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Britain Testing Driverless Cars on Roadways

Britain Testing Driverless Cars on Roadways

AP (July 30, 2014) — British officials said on Wednesday that driverless cars will be tested on roads in as many as three cities in a trial program set to begin in January. Officials said the tests will last up to three years. (July 30) Video provided by AP
Powered by NewsLook.com
China's Drone King Says the Revolution Depends on Regulators

China's Drone King Says the Revolution Depends on Regulators

Reuters - Business Video Online (July 30, 2014) — Comparing his current crop of drones to early personal computers, DJI founder Frank Wang says the industry is poised for a growth surge - assuming regulators in more markets clear it for takeoff. Jon Gordon reports. Video provided by Reuters
Powered by NewsLook.com
3Doodler Bring 3-D Printing to Your Hand

3Doodler Bring 3-D Printing to Your Hand

AP (July 30, 2014) — 3-D printing is a cool technology, but it's not exactly a hands-on way to make things. Enter the 3Doodler: the pen that turns you into the 3-D printer. AP technology writer Peter Svensson takes a closer look. (July 30) Video provided by AP
Powered by NewsLook.com
Climate Change Could Cost Billions, According To White House

Climate Change Could Cost Billions, According To White House

Newsy (July 29, 2014) — A report from the White House warns not curbing greenhouse gas emissions could cost the U.S. billions. 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:
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