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Future batteries: Lithium-sulfur with a graphene wrapper
http://www.eurekalert.org/pub_releases/2014-12/aiop-fbl121514.php[font face=Serif]PUBLIC RELEASE DATE: 16-Dec-2014
Contact: Jason Socrates Bardi
jbardi@aip.org
240-535-4954
American Institute of Physics
@AIP_Publishing
[font size=5]Future batteries: Lithium-sulfur with a graphene wrapper[/font]
[font size=4]UK-China team has designed a novel cathode for rechargeable lithium-sulfur batteries featuring a thin 'wrap sandwich' sheet of graphene[/font]
[font size=3]WASHINGTON D.C., December 16, 2014 -- What do you get when you wrap a thin sheet of the "wonder material" graphene around a novel multifunctional sulfur electrode that combines an energy storage unit and electron/ion transfer networks? An extremely promising electrode structure design for rechargeable lithium-sulfur batteries.
…
Metal organic frameworks (MOFs) have attracted plenty of attention recently, thanks to wide-ranging applications in hydrogen storage, carbon dioxide sequestration, catalysis and membranes. And to create their cathode, the team tapped MOF "as a template" to produce a conductive porous carbon cage -- in which sulfur acts as the host and each sulfur-carbon nanoparticle acts as energy storage units where electrochemical reactions occur.
"Our carbon scaffold acts as a physical barrier to confine the active materials within its porous structure," explained Kai Xi, a research scientist at Cambridge. "This leads to improved cycling stability and high efficiency." They also discovered that by further wrapping the sulfur-carbon energy storage unit within a thin sheet of flexible graphene speeds the transport of electrons and ions.
What's behind the improved capacity? Fast charge-transfer kinetics are made possible by an interconnected graphene network with high electrical conductivity, according to the team. Their work shows that the composite structure of a porous scaffold with conductive connections is a promising electrode structure design for rechargeable batteries.
…[/font][/font]
http://dx.doi.org/10.1063/1.4901751Contact: Jason Socrates Bardi
jbardi@aip.org
240-535-4954
American Institute of Physics
@AIP_Publishing
[font size=5]Future batteries: Lithium-sulfur with a graphene wrapper[/font]
[font size=4]UK-China team has designed a novel cathode for rechargeable lithium-sulfur batteries featuring a thin 'wrap sandwich' sheet of graphene[/font]
[font size=3]WASHINGTON D.C., December 16, 2014 -- What do you get when you wrap a thin sheet of the "wonder material" graphene around a novel multifunctional sulfur electrode that combines an energy storage unit and electron/ion transfer networks? An extremely promising electrode structure design for rechargeable lithium-sulfur batteries.
…
Metal organic frameworks (MOFs) have attracted plenty of attention recently, thanks to wide-ranging applications in hydrogen storage, carbon dioxide sequestration, catalysis and membranes. And to create their cathode, the team tapped MOF "as a template" to produce a conductive porous carbon cage -- in which sulfur acts as the host and each sulfur-carbon nanoparticle acts as energy storage units where electrochemical reactions occur.
"Our carbon scaffold acts as a physical barrier to confine the active materials within its porous structure," explained Kai Xi, a research scientist at Cambridge. "This leads to improved cycling stability and high efficiency." They also discovered that by further wrapping the sulfur-carbon energy storage unit within a thin sheet of flexible graphene speeds the transport of electrons and ions.
What's behind the improved capacity? Fast charge-transfer kinetics are made possible by an interconnected graphene network with high electrical conductivity, according to the team. Their work shows that the composite structure of a porous scaffold with conductive connections is a promising electrode structure design for rechargeable batteries.
…[/font][/font]
