[access-uk] Re: New battery technology
- From: "Tristram Llewellyn" <tristram.llewellyn@xxxxxxxxxxxxxxxxxxx>
- To: <access-uk@xxxxxxxxxxxxx>
- Date: Fri, 22 Feb 2008 09:34:09 -0000
A problem with the spare battery aproach is that if you do not always
need it you will find it looses charge and it therefore does not go
through the more natural charge-discharge cycle which even with modern
batteries can shorten their expected life. Quite apart from that if you
have forgotton to charge that spare and really do need it you are up the
creek. I think there is a very real conundrum with us having the one
device that claims to do it all but doesn't have the battery to
realistically do it and the N95 original is a prime example of that
problem even though it is a splendid phone cum music player.
Regards.
Tristram Llewellyn
tristram.llewellyn@xxxxxxxxxxxxxxxxxxx
Technical Support
Sight and Sound Technology
-----Original Message-----
From: access-uk@xxxxxxxxxxxxx [mailto:access-uk@xxxxxxxxxxxxx] On Behalf
Of Steve Nutt
Sent: Saturday, December 22, 2007 12:25 PM
To: access-uk@xxxxxxxxxxxxx
Subject: [access-uk] Re: New battery technology
Hi Graham,
What about that little thing called a spare battery? I do most things
on my
N95, and just carry a spare battery with me at all times. I get two
days
out the N95, so the spare is not often needed but there if it is.
All the best
Steve
-----Original Message-----
From: access-uk@xxxxxxxxxxxxx [mailto:access-uk@xxxxxxxxxxxxx] On Behalf
Of
Graham Page
Sent: 21 December 2007 14:06
To: access-uk@xxxxxxxxxxxxx
Subject: [access-uk] Re: New battery technology
I would certainly agree that battery life is one of the things really
holding portable technology back at the moment.
The PDA has not taken off in a really big way because battery life is
just
too limited. If you have a smart phone that can play music, act as a
PDA or
even laptop with a keyboard attached and maybe a music player and DAB
receiver as well this is great on the surface as less devices are
needed.
However of course the battery just lets you down. I certainly look
forward
to a time when longer lasting batteries will mean that all in one
devices
could be a reality, though whether a mobile phone and a DAB radio should
be
put in the same box is questionable due to interference problems I
suppose.
cheers
Graham
Graham Page
Home Phone: 0207 265 9493
Mobile: 07753 607980
Fax: 0870 706 2773
Email: gpage@xxxxxxxxxxxxxx
MSN: gabriel_mcbird@xxxxxxxxxxx
Skype: gabriel_mcbird
----- Original Message -----
From: "Darren Brewer" <darren.m.brewer@xxxxxxxxxxxxxxxx>
To: <access-uk@xxxxxxxxxxxxx>
Sent: Friday, December 21, 2007 1:32 PM
Subject: [access-uk] New battery technology
Hi All.
Below is a small article about new developments in battery technology
that
may interest some list members. It's a bit technical so if you're not
bothered, hit delete now.
New nano wire battery holds 10 times the charge of existing ones.
The new version, developed through research led by Yi Cui, assistant
professor of materials science and engineering, produces 10 times the
amount of electricity of existing lithium-ion, known as Li-ion,
batteries. A
laptop that now
runs on battery for two hours could operate for 20 hours, a boon to
ocean-hopping business travelers.
"It's not a small improvement," Cui said. "It's a revolutionary
development."
The greatly expanded storage capacity could make Li-ion batteries
attractive to electric car manufacturers. Cui suggested that they could
also be used in homes or offices to store electricity generated by
rooftop
solar panels.
"Given the mature infrastructure behind silicon, this new technology can
be pushed to real life quickly," Cui said.
The electrical storage capacity of a Li-ion battery is limited by how
much lithium can be held in the battery's anode, which is typically made
of carbon. Silicon has a much higher capacity than carbon, but also has
a
drawback.
Silicon placed in a battery swells as it absorbs positively charged
lithium atoms during charging, then shrinks during use (i.e., when
playing your iPod) as the lithium is drawn out of the silicon. This
expand/shrink cycle
typically causes the silicon (often in the form of particles or a thin
film) to pulverize, degrading the performance of the battery.
Cui's battery gets around this problem with nanotechnology. The lithium
is stored in a forest of tiny silicon nanowires, each with a diameter
one-thousandth the thickness of a sheet of paper. The nanowires inflate
four
times
their normal size as they soak up lithium. But, unlike other silicon
shapes, they do not fracture.
Research on silicon in batteries began three decades ago. Candace Chan,
a graduate student of Cui, explained: "The people kind of gave up on it
because the capacity wasn't high enough and the cycle life wasn't good
enough.
And it was just because of the shape they were using. It was just too
big, and they couldn't undergo the volume changes."
Then, along came silicon nanowires. "We just kind of put them together,"
Chan said.
For their experiments, Chan grew the nanowires on a stainless steel
substrate, providing an excellent electrical connection. "It was a
fantastic moment when Candace told me it was working," Cui said.
Cui said that a patent application has been filed. He is considering
formation of a company or an agreement with a battery manufacturer.
Manufacturing the nanowire batteries would require "one or two different
steps, but the
process can certainly be scaled up," he added. "It's a well understood
process."
The breakthrough is described in detail in a paper, "High-performance
lithium battery anodes using silicon nanowires," published online Dec.
16 in Nature Nanotechnology, written by Cui, his graduate chemistry
student
Candace
Chan and five others.
Also contributing to the paper in Nature Nanotechnology were Halin Peng
and Robert A. Huggins of Materials Science and Engineering at Stanford,
Gao Liu of Lawrence Berkeley National Laboratory, and Kevin McIlwrath
and
Xiao
Feng Zhang of the electron microscope division of Hitachi High
Technologies in Pleasanton, California.
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