Toshiba has developed new 100Wh/kg li-ion batteries that use lithium titanate for the negative electrode, the new cells have a 50 percent higher energy density than traditional li-ion batteries. Samples of the new batteries are expected in Fall 2009.
Its current capacity is 20Ah and output density is about 1,000W/kg. Toshiba is currently manufacturing a 4.2Ah cell with an energy density of about 67Wh/kg for electric bicycles and other applications. The company improved the energy density by about 1.5 times by replacing lithium cobaltate previously used for the positive electrode, it said.
Toshiba has already developed a 3Ah high power cell with an output density of 4,000W/kg for hybrid cars and is now shipping its samples.