Toshiba Corp developed a cell of a Li-ion secondary battery for electric vehicles. Using lithium titanate as a material for its negative electrode, the cell has an energy density as high as 100Wh/kg (See related article).
Sample shipments will start in the fall of 2009, the company said.
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.