I agree with Kent! My 75 to 85 mile (farthest I ever went was 88.8 miles)
per charge 2012 LEAF would be able to go 400+ miles on a charge with those
batteries! Right?
--------------------------------------------------
From: "Kent Barnes" <[email protected]>
Sent: Wednesday, January 16, 2013 10:12 AM
To: "'Electric Vehicle Discussion List'" <[email protected]>
Subject: Re: [EVDL] Stanford researchers develop sulfur cathode,giving
Li-Ion 5 times higher energy density
Okay, that worked. Great article....Holy s____t when will someone start
building them?
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf
Of robert winfield
Sent: Wednesday, January 16, 2013 9:44 AM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Stanford researchers develop sulfur cathode,giving
Li-Ion 5 times higher energy density
http://spectrum.ieee.org/nanoclast/semiconductors/nanotechnology/nanoparticl
e-enables-world-record-for-energy-storage-in-batteries
Nanoparticle Enables World Record for Energy Storage in Batteries POSTED
BY:
Dexter Johnson / Wed, January 09, 2013
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With just one week under our belts in this New Year, we already have some
world-record news in relation to lithium-ion (Li-ion) batteries and
nanoparticles. Researchers at Stanford University and the SLAC National
Accelerator Laboratory have developed a Li-ion battery in which its sulfur
cathode was capable of storing five times more energy than is possible
with
today's commercially available batteries.
The research-not surprisingly-was led by Stanford's Yi Cui. What may be
somewhat surprising is that Cui has focused his attention in this research
on the cathode rather than the anode of the battery. Much of Cui's most
recent work has been on improving the anodes of Li-ion batteries through
the
use of nanostructured silicon. In this latest research, he has not only
shifted his attention to the cathode, but also developed an entirely new
material to do it.
The new material, which is described in the Jan. 8 edition of Nature
Communications ("Sulphur-TiO2 yolk-shell nanoarchitecture with internal
void
space for long-cycle lithium-sulphur batteries"), is a nanoparticle that
is
made up of an inner core of sulfur surrounded by an outer layer of porous
titanium-oxide. The nanoparticles architecture resembles that of the yolk
and shell of an egg.
This nanoparticle's new architecture has broken down an obstacle to using
sulfur in the cathode of Li-ion batteries that has persisted for around 20
years.
While it has been known that sulfur could store more lithium ions than
other
cathode materials, the combination of sulfur atoms with lithium ions
resulted in a compound-though necessary for the cathode to operate-that
kept
dissolving and limited the storage capacity of the battery. Also, when the
lithium ions went into the cathode, it would expand the size of the
cathode
by 80 percent. Attempts to employ protective coatings to correct the first
problem of the compound dissolving just resulted in them cracking as soon
the lithium ions expanded the cathode.
In the new architecture that Cui has developed, there is space between the
sulfur and the hard-but porous-titanium oxide. What this means is that the
sulfur-lithium intermediate compound does not dissolve because it is
protected by hard outer surface of the nanoparticle and the sulfur inside
has enough room to expand in the space between the core and the outer
shell.
"It basically worked the first time we tried it," Cui says in a press
release. "The sulfur cathode stored up to five times more energy per
sulfur
weight than today's commercial materials."
"After 1,000 charge/discharge cycles, our yolk-shell sulfur cathode had
retained about 70 percent of its energy-storage capacity. This is the
highest performing sulfur cathode in the world, as far as we know," he
said.
"Even without optimizing the design, this cathode cycle life is already on
par with commercial performance. This is a very important achievement for
the future of rechargeable batteries."
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