Lighter lithium batteries

ScienceNOW: With $27 billion a year in sales, lithium-ion batteries already dominate the market for rechargeables. But there's always pressure to do better. Now researchers report that they've come up with a way to use nanotechnology to either significantly increase the energy storage capacity of lithium-ion batteries or reduce their weight while maintaining their current energy content. The new work could lead to everything from lighter laptops to electric cars with a considerably longer range.