Subscribe free to our newsletters via your
. 24/7 Space News .




ENERGY TECH
Researchers increase energy density of lithium storage materials
by Staff Writers
Karlsruher, Germany (SPX) Mar 18, 2015


New storage material is shown with (left) and without lithium (right). Image courtesy HIU. For a larger version of this image please go here.

The lithium ion battery currently is the most widespread battery technology. It is indispensable for devices, such as laptops, mobile phones or cameras. Current research activities are aimed at reaching higher lithium storage densities in order to increase the amount of energy stored in a battery. Moreover, lithium storage should be quick for energy supply of devices with high power requirements. This requires the detailed understanding of the electrochemical processes and new development of battery components.

The materials used so far are based on intercalation storage of lithium in small cavities (so-called interstitials), in a host structure that usually consists of metal oxides. This method works well, but the storage densities reached are limited, as lithium cannot be packed very densely in the structure.

In addition, intercalation storage of more than one lithium ion per formula unit is generally not possible, as the structure then is no longer stable and collapses. It would therefore be desirable to increase the packing density of lithium in the stable structure and to exceed the upper limits reached so far.

A team around Professor Maximilian Fichtner and Dr. Ruiyong Chen of KIT has now presented a new storage principle and a material on this basis, which allows for the reversible storage of 1.8 Li per formula unit. With a material of the composition Li2VO2F, storage capacities of up to 420 mAh/g were measured at a mean voltage of 2.5 V. As a result of the comparably high density of the material, a storage capacity of up to 4600 Wh/L relative to the active material is obtained.

Contrary to the materials used so far, the new system no longer stores lithium at the interstitials, but directly at the lattice sites of a cubic close packed structure. As a result, packing densities are increased significantly.

Surprisingly, the lithium ions are highly mobile in this structure and can be incorporated into the lattice and removed again easily. Vanadium takes up two charges or releases them again, while the lattice as a whole remains stable - a novelty in such storage materials. The structure has a high defect mobility, such that the lattice can stabilize itself.

"The high stability of the structure at a high defect mobility, associated with a very small volume change of 3 % only - this is what makes the new system unusual. The storage principle appears to be transferable to other compositions. Using other compounds of similar structure, we presently measure even higher energy densities than for the vanadium-based system," the head of the research team, Maximilian Fichtner, reports.

R. Chen, S. Ren, M. Knapp, D. Wang, R. Witter, M. Fichtner, and H. Hahn: Disordered Lithium-Rich Oxyfluoride as a Stable Host for Enhanced Li+ Intercalation Storage. Advanced Energy Materials. Article first published online: 3 FEB 2015. DOI: 10.1002/aenm.201401814


Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

.


Related Links
Karlsruher Institut fur Technologie (KIT)
Powering The World in the 21st Century at Energy-Daily.com






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





ENERGY TECH
Researchers synthesize new thin-film material for use in fuel cells
Washington DC (SPX) Mar 13, 2015
Researchers from Cornell University have synthesized a new thin-film catalyst for use in fuel cells. In a paper published March 10 in the journal APL Materials, from AIP Publishing, the team reports the first-ever epitaxial thin-film growth of Bi2Pt2O7 pyrochlore, which could act as a more effective cathode - a fundamental electrode component of fuel cells from which positive current flows throu ... read more


ENERGY TECH
Billionaire Teams Up with NASA to Mine the Moon

China Gets One Step Closer to Completing its Ambitious Lunar Mission

Core work: Iron vapor gives clues to formation of Earth and moon

Application of laser microprobe technology to Apollo samples refines lunar impact history

ENERGY TECH
NASA Challenge Invites Students to Help Design Journey to Mars Systems

Taking a Closer Look at Purple-Bluish Rock Formation

Mystery Giant Mars Plumes Still Unexplained

Have you ever used a camera on board an interplanetary spacecraft

ENERGY TECH
Merkel to open IT fair with China showcasing tech's shift east

Intergalactic GPS Will Guide You through the Stars

Space soprano plans first duet from ISS

Planetary Society Announces Test Flight for Privately Funded LightSail Spacecraft

ENERGY TECH
China's Space Laboratory Still Cloaked

China has ability but no plan for manned lunar mission: expert

Tianzhou-1 cargo ship to dock with space lab in 2016

China's test spacecraft simulates orbital docking

ENERGY TECH
Testing astronauts' lungs in Space Station airlock

Astronauts return to Earth on Russian Soyuz spaceship

International Space Station 'Lost' Without Russia Says NASA Chief

US astronauts speed through spacewalk at orbiting lab

ENERGY TECH
Soyuz Installed at Baikonur, Expected to Launch Wednesday

45th Space Wing unveils multi-vehicle launch support center

THOR 7 being fueled for Arianespace's dual-payload April mission

Arianespace wins SES-15 launch contract

ENERGY TECH
Scientists: Nearby Earth-like planet isn't just 'noise'

'Habitable' planet GJ 581d previously dismissed as noise probably does exist

Exorings on the Horizon

Planet 'Reared' by Four Parent Stars

ENERGY TECH
In pursuit of the perfectly animated cloud of smoke

3-D printer for small molecules opens access to customized chemistry

Researchers identify process for improving durability of glass

New research into materials for tooth fillings




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.