electrodes

New Lithium Batteries Could Remove Pesky Explosion Problem

Popular Science - March 16, 2010 - 7:59am

Lithium-ion batteries used in hybrid cars, laptops and cell phones have occasionally undergone recalls and false scares concerning the possibility of exploding. Stanford University scientists have created lithium-sulfide electrodes that could create batteries that last four times longer and avoid any risk of possible explosions, Technology Review reports.

The Stanford group has created a prototype lithium-sulfide cathode that forms the partner electrode to an earlier anode developed in 2007. The non-metallic form of lithium avoids a safety issue where the lithium metal can grow branchlike structures that penetrate the polymer layer which keeps the battery's two electrodes apart. Such incidents can lead to short circuits and possible explosions. Read more »

Wonder Material Graphene Becomes Lighting for Future Devices and Homes

Popular Science - February 9, 2010 - 9:30am

New light-emitting electrochemical cells could replace OLEDs

Graphene may brighten the future more literally than we had originally anticipated, besides merely revolutionizing electronics and Silicon Valley. Swedish and American researchers have transformed the one-atom-thick carbon material into a new, inexpensive lighting component that could give organic light diodes (OLEDs) a run for their money. Read more »

South Korean Scientists Transmit Broadband Signals Through Human Arm

Popular Science - March 16, 2010 - 4:19am

The experiment transmitted 10 Mbps through a person

Human skin is apparently a very energy-efficient conduit for transmitting data. A recent experiment achieved a rate of 10 megabits per second, which may put my Internet connection to shame. The experiment used small, flexible electrodes and took place at Korea University in Seoul, New Scientist reports.

The finding may lead to a new generation of medical devices that can monitor blood sugar or electrical activity in the heart. Such devices cut energy needs for a monitoring network by about 90 percent compared to wireless devices running on batteries.

South Korean researchers placed electrodes about 12 inches (30 centimeters) apart on a person's arm, and found that the low-frequency electromagnetic waves travel easily through the skin without any outside interference. Read more »