Lithium band diagram

Fig. 2.8 Electronic band diagram of Li-ion batteries with various electrodes olivine LiFeP04, lamellar LiCo02, and spinel LiNii/2Mn3/204 as cathodes and lithium-metal and carbon as anodes. a and represent the Fermi level of anode and cathode respectively. Eg is the electrolytic window that ensures the thermodynamic stability, while a > El and Eq < Eh requires a kinetic stability by the formation of an SEI layer...

A lithium niobate crystal doped with Pr + ions is excited with light of wavelength 470 nm. Structured emission bands centered around 620 nm, 710 nm, 880 nm, and 1062 nm are observed. Using the Dieke diagram, identify the excited and terminal states responsible for the previous emission bands. 

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