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




ENERGY TECH
ORNL microscopy directly images problematic lithium dendrites in batteries
by Staff Writers
Oak Ridge TN (SPX) Mar 13, 2015


ORNL electron microscopy captured the first real-time nanoscale images of the nucleation and growth of lithium dendrite structures known to degrade lithium-ion batteries. Image courtesy ORNL.

Scientists at the Department of Energy's Oak Ridge National Laboratory have captured the first real-time nanoscale images of lithium dendrite structures known to degrade lithium-ion batteries. The ORNL team's electron microscopy could help researchers address long-standing issues related to battery performance and safety.

Dendrites form when metallic lithium takes root on a battery's anode and begins growing haphazardly. If the dendrites grow too large, they can puncture the divider between the electrodes and short-circuit the cell, resulting in catastrophic battery failure.

The researchers studied dendrite formation by using a miniature electrochemical cell that mimics the liquid conditions inside a lithium-ion battery. Placing the liquid cell in a scanning transmission electron microscope and applying voltage to the cell allowed the researchers to watch as lithium deposits - which start as a nanometer-size seed - grew into dendritic structures.

"It gives us a nanoscopic view of how dendrites nucleate and grow," said ORNL's Raymond Unocic, in situ microscopy team leader. "We can visualize the whole process on a glassy carbon microelectrode and observe where the dendrites prefer to nucleate and also track morphological changes during growth."

In addition to imaging the structures at high-resolution, the team's microscopy technique gathered precise measurements of the cell's electrochemical performance. "This technique allows us to follow subtle nano-sized structural and chemical changes that occur and more importantly, correlate that to the measured performance of a battery," said Robert Sacci, ORNL postdoctoral researcher and lead author of the Nano Letters study.

This real-time analysis in a liquid environment sets the ORNL team's approach apart from other characterization methods.

"Usually when you run a battery over many charge-discharge cycles, you typically wait until things start failing and at that point you perform a root-cause failure analysis," Unocic said. "Then you see there's a dendrite - but so what? Now that we can see exactly how the dendrites are forming using our technique, we can be proactive and devise strategies for inhibiting or reducing these phenomena."

The ORNL team believes scientists who are experimenting with different ways to tackle the dendrite problem, such as liquid additives or stronger separators, will benefit from its research.

"If you don't understand the basic mechanism of why things happen in your devices, you'll always be thinking, 'Why did this happen and how do I fix it?'" Unocic said. "Until you get down to the microscopic and nanoscopic level to look at the structural and chemical evolution that's happening in the cells - then you can't truly address those issues that come up."

The study is published as "Nanoscale Imaging of Fundamental Li Battery Chemistry: Solid-Electrolyte Interphase Formation and Preferential Growth of Lithium Metal Nanoclusters." Coauthors are Robert Sacci, Jennifer Black, Nina Balke, Nancy Dudney, Karren More and Raymond Unocic.


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
DOE/Oak Ridge National Laboratory
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
Energy-generating cloth could replace batteries in wearable devices
Washington DC (SPX) Mar 06, 2015
From light-up shoes to smart watches, wearable electronics are gaining traction among consumers, but these gadgets' versatility is still held back by the stiff, short-lived batteries that are required. These limitations, however, could soon be overcome. In the journal ACS Nano, scientists report the first durable, flexible cloth that harnesses human motion to generate energy. It can also s ... read more


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

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

NASA releases video of the far side of the Moon

US Issuing Licenses for Mineral Mining on Moon

ENERGY TECH
Use of Rover Arm Expected to Resume in a Few Days

Revolutionary Engine Could Fuel Human Life on Mars

Research Suggests Mars Once Had More Water than Earth's Arctic Ocean

Mars Colonization Edges Closer Thanks to MIT's Oxygen Factory

ENERGY TECH
Orion's Launch Abort System Motor Exceeds Expectations

Cheap yen, fading Fukushima fears lure Japan tourists

Dubai to build 'Museum of the Future'

Old-economy sectors are now tech, too: US study

ENERGY TECH
China at technical preparation stage for Mars, asteroid exploration

China's moon rover Yutu functioning but stationary

Argentina welcomes first Chinese satellite tracking station outside China

More Astronauts for China

ENERGY TECH
US astronauts speed through spacewalk at orbiting lab

Watching Alloys Change from Liquid to Solid Could Lead to Better Metals

NASA Hopes to Continue Cooperation on ISS Until 2024

Russia to use International Space Station till 2024

ENERGY TECH
Soyuz Installed at Baikonur, Expected to Launch Wednesday

Arianespace's Soyuz ready for next dual-satellite Galileo launch

Arianespace certified to ISO 50001 at Guiana Space Center

SpaceX launches two communications satellites

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

Exorings on the Horizon

Planet 'Reared' by Four Parent Stars

Planets Can Alter Each Other's Climates over Eons

ENERGY TECH
German govt okays bill to boost electronic appliance recyling

Google gearing Android for virtual reality: report

Video game makers grapple with need for diversity

Sony virtual reality head gear set for 2016 release




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.