1 research outputs found
Conversion Reaction of CoO Polycrystalline Thin Films Exposed to Atomic Lithium
We
have studied the reaction of 5 nm thick polycrystalline CoO
films with atomic lithium as a model for the discharge of lithium-ion
conversion battery electrodes. The electronic structure has been investigated
with X-ray photoemission, ultraviolet photoemission, and inverse photoemission,
while the morphology, crystal structure, and unoccupied states of
the films have been examined with transmission electron microscopy.
It is found that exposure to atomic lithium leads, at room temperature,
to partial conversion with formation of Co and Li<sub>2</sub>O, but
also of a Li<sub>2</sub>O<sub>2</sub> or LiOH overlayer at the surface
of the sample. As full conversion was obtained at 150 °C, a comparison
with room-temperature measurements enables the understanding of the
kinetic limitations during lithiation