Electrical and electrochemical performance characteristics of large capacity lithium-ion cells

摘要

We are currently evaluating large capacity (20--40 Ah) Bluestar (cylindrical) and Yardney (prismatic) lithium-ion cells for their electrical and electrochemical performance characteristics at different temperatures. The cell resistances were nearly constant from room temperature down to-20deg. C, but increased by over l0 times at-40deg. C. The specific energies and powers, as well as the energy densities and power densities are high and did not reach a plateau even at the highest discharge rates tested. For example, the prismatic lithium-ion cells gave close to 280 Wh dm~-3 from a 4 A discharge and 249 Wh dm~-3 at 20 A, both at room temperature. For the same current range the specific energy values were l02 Wh kg~-1 and 9l Wh kg~-1Cycle life and other electrical and electrochemical properties of the cells will be presented.