Rate capabilities and specific energies of Li/MnO₂ andLi/Li_xCoO₂ AA cells

摘要

Rechargeable lithium battery chemistries are being evaluated forlow power underwater vehicle applications. Testing of AA size cells hasbeen completed for Moli Energy's lithium/manganese dioxide (MnO₂) and Alliant Techsystems' first embodiment of the lithium/lithiumcobalt oxide (Li/Li_xCoO₂) system in the AA size.Cells were cycled at various discharge rates, temperatures, and depthsof discharge. At 25° C and 5 mA/cm², delivered energydensities were about 30 Wh/lb for Li/MnO₂ cycled over 0.375F/mol. Li/Li_xCoO₂ cells cycled under the sameconditions delivered an equivalent energy density. WhenLi/Li_xCoO₂ cells were cycled to utilize 0.5 and0.75 F/mol, energy densities of 40 Wh/lb and 60 Wh/lb, respectively,were demonstrated