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Ddr Density

November 2nd, 2008

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Balance between density and discharge durability New battery technology by batteryfast

Seeks balance between density and discharge durability New battery technology by
batteryfast.co.uk

Rssinecent battery developments in both novel lithium salt and lithium air show promise for addreg the power density and high charge cycle capacity needed for today’s electric vehicles.

Researchers at Huazhong University of Science and Technology in China are exploring the use of a novel lithium salt to improve the high-temperature resilience of lithium-ion cells while scientists at the Savannah River National Laboratory are developing energy dense lithium air
batteries
.

LiFNFSI a candidate to overcome rapid capacity fading?

The novel lithium salt, (LiFNFSI), is being used as a conducting salt in the electrolyte of
batteries
. The researchers claim that current tests show better thermal stability than LiPF6 along with high conductivity, comparable to LiClO4, and good electrochemical stability. In addition, it is non-corrosive to aluminum.

At both room temperature (25 °C) and elevated temperature (60 °C), the graphite/LiCoO2 cells with LiFNFSI have exhibited better cycling performances than those with LiPF6.

Particularly, the researches noted, at 60 °C, the capacity fading rate of the LiFNFSI-based cell without any additive is 37% after 100 cycles, while the cell with LiPF6 fails rapidly.

These particular properties, the researchers claim, make LiFNFSI an attractive candidate to overcome the rapid capacity fading of
lithium-ion batteries
at elevated temperatures.

Motorola GP1280 Two-Ways Radio Battery
on sales

Brand New 7.2V 1800mAh only GBP £ 21.74

A battery that holds 5 to 10 times as much energy as lithium-ion?

Scientists at the Savannah River National Laboratory have been testing lithium air, a technology that they suggest could create
lithium-ion batteries
with 5 to 10 times the energy capacity per weight of currentlithium ion batteries and double the amount per volume.

“No other
battery
has that kind of energy density, so far as we know,” says Ming Au, principal scientist.

Lithium air batteries use a lithium anode and a cathode comprised of a porous material that draws oxygen from the air. The lithium combines with oxygen to form lithium oxide and release energy. Because the oxygen comes from the ambient air, the cathode is lighter than that of a
li-ion battery
, giving lithium-air batteries far higher energy density.

The lab has demonstrated a coin-sized rechargeable lithium-air battery with a density of 600 mAh/g, far higher than the 100 to 150 mAh/g of
lithium-ion batteries
.

Obstacles do remain in the development process, the biggest being the limited number of times such
batteries
can be cycled. The lithium-air battery that Mr. Au’s team developed can be recharged only 50 times or so. Researchers do hope to speed up the recharging process but Au noted that “rechargeable lithium-air batteries probably won’t be commercially viable to many years.”

*
Bosch 12 VE-2 batteryBosch 12 VE-2 Battery

*

o Voltage : 12.2V

o Capacity : 2000mAh

o Dimensions :106.50×86.00×111.50mm

o Type : Ni-cd

o List Price : £ 43.34

o Now Price: £ 33.34

Catalyst may be the key

The challenge with lithium air lies in converting the lithium oxide back into lithium, which currently can be done only with catalysts. However, last year, researchers at the Massachusetts Institute of Technology discovered that electrodes that use gold or platinum as a catalyst are more efficient than carbon electrodes.

The MIT team will be studying the chemistry of the charging and discharging processes to determine what compounds are produced and how they react with others in the system. Through their research, they hope to determine the optimal catalyst for use in lithium-air batteries.

Source:
Battery technology

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