Print  |  Send  |   

Silicon-carbon nanocomposite seeks to boost lithium-ion performance

March 16, 2010 // Paul Buckley

Silicon-carbon nanocomposite seeks to boost lithium-ion performance

A high-performance anode structure based on silicon-carbon nanocomposite materials developed by the Georgia Institute of Technology is aiming to improve the performance of lithium-ion batteries used in a wide range of applications from hybrid vehicles to portable electronics.


Employing a "bottom-up" self-assembly technique, the anode’s structure takes advantage of nanotechnology to fine-tune its materials properties, addressing the shortcomings of earlier silicon-based battery anodes. The low-cost fabrication technique was designed to be easily scaled up and compatible with existing battery manufacturing.

"Development of a novel approach to producing hierarchical anode or cathode particles with controlled properties opens the door to many new directions for lithium-ion battery technology," said Gleb Yushin, an assistant professor in the School of Materials Science and Engineering at the Georgia Institute of Technology. "This is a significant step toward commercial production of silicon-based anode materials for lithium-ion batteries."

Existing lithium-ion batteries rely on anodes made from graphite, a form of carbon. Silicon-based anodes theoretically offer as much as a ten-fold capacity improvement over graphite but have so far not been stable enough for practical use.

Graphite anodes use particles ranging in size from 15 to 20 microns. If silicon particles of that size are simply substituted for the graphite, expansion and contraction as the lithium ions enter and leave the silicon creates cracks that quickly cause the anode to fail.

The new nanocomposite material solves that degradation problem, potentially allowing battery designers to tap the capacity advantages of silicon and enabling a higher power output from a given battery size – or allow a smaller battery to produce a required amount of power.

Electrical measurements of the new composite anodes in small coin cells have shown a capacity more than five times greater than the theoretical capacity of graphite.

Details of the new self-assembly approach were published online in the journal Nature Materials on March 14.

Related link: www. gatech.edu

All news

Power Supplies/Batteries

Follow us

Fast, Accurate & Relevant for Design Engineers only!

Technical papers     

Filter Wizard     

Check out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.

Linear video channel

READER OFFER

Read more

This month, Arrow Electronics is giving away ten XMC1200 lighting application kits, worth 100 Euros each, for EETimes Europe's readers to win.

Each kit combines Infineon’s brightness and colour control XMC1200 CPU board to drive flicker free LED dimming and colour changing, together with a colour LED card and a white LED card.

Read more

Design centers     

Automotive
Infotainment Making HDTV in the car reliable and secure

December 15, 2011 | Texas instruments | 222901974

Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.

 

You must be logged in to view this page

Login here :