3M's Higher-Capacity Lithium-Ion BatteriesContinued from page 1
3M's approach reduces the amount the anode expands by using amorphous silicon, rather than crystalline silicon, and pairing this with inert materials, helping to stabilize the system. 3M engineers have also developed better methods for depositing the materials onto the films that are later rolled up to form a cylindrical battery. They are now optimizing these methods for large-scale manufacturing. The new materials reduce but do not eliminate expansion and contraction as the ions move in and out of the anode. As a result, the researchers are developing new battery designs that can absorb the changes in size. Obrovac says that these designs, along with the new electrode and electrolyte materials, should be ready for battery manufacturers to start incorporating into their products sometime next year. Ted Miller, supervisor of advanced battery technology at Ford Motor, in Dearborn, MI, says that a move away from graphite to these kinds of anodes is, in addition to offering capacity gains, essential for coping with extremely cold conditions that they could be exposed to in vehicle applications. Under these conditions, charging a battery can cause lithium metal to build up, sometimes doing many months' worth of damage to the battery in the course of a few minutes. Moving away from graphite will prevent the reactions that lead to lithium-metal buildup, Miller says. So far, only one alloy-based anode is being used commercially: a battery from Sony called Nexelium, which uses a tin-based anode. But this technology will start to appear more often, according to MIT materials scientist Yet-Ming Chiang. "It's a very logical direction" for battery companies to go in, he says. |
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Better Lithium-ion Batteries
03/27/2009
Massachusetts Institute of Technology
Comments
My questions for all new battery/energy storage systems would be:
Energy density Change
Power density change
Recharge time Change
Cycle life change
Production Cost change
Material Cost and supply change
I think this is a great thing though and congratulations on the break through.
asdar
10/25/2006
Posts:69
3800 A/kg. See the webpage at
http://vulvoxnanobio.tripod.com
protn7
10/31/2006
Posts:69
Unfortunately it's all lies. Farbstein is trying to defraud potential investors.
Google him, it's quite a laugh.
N O M
08/20/2008
Posts:23
From what I have read, Altair seems to have the best new battery technology out there.
Adam
11/09/2006
Posts:1
sculptor
06/27/2007
Posts:8
sculptor
06/27/2007
Posts:8
..........
The chemical reaction that occurs in lithium-ion batteries is complicated. But the basic reaction involves coupling a lithium-carbon compound (which serves as the negative electrode) with cobalt oxide (which serves as the positive electrode), according to K.M. Abraham, a lithium battery consultant and visiting chemistry research professor at Northeastern University in Boston.
Normally this reaction is controlled and safe. But if uncontrolled, the lithium can stoke a huge reaction, he said.
....If a particle -- such as a speck of metal -- breaches the protective membrane during manufacturing, the particles worm through the opening and collide with the electrode, causing the device to short-circuit.........
engineering
07/01/2007
Posts:3