Origin and characterization of the oxygen loss phenomenon in the layered oxide cathodes of Li-ion batteries

Abstract

Li-ion batteries have been widely applied in the field of energy storage due to their high energy density and environmental friendliness. Attributing to the high capacity (~200 mAh g-1) and...

Does trapped O2 form in the bulk of LiNiO2 during charging?

“…This is generally related to O-loss which reduces the O content at the surface and triggers Ni migration inward to sites in the Li layer. 5,24,48–53 To quantify O-loss in our sample, operando electrochemical mass spectrometry (OEMS) was performed for LiNiO 2 over the first cycle, ESI† Fig. S9 and S10.…”

“…Recent research into O oxidation in Li-rich cathodes, such as Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 , has indicated that oxidised oxygen takes the form of molecular O 2 , which is trapped within vacancy clusters in the cathode structure. 21–25 However, in the case of stoichiometric materials like LiNiO 2 , it has been argued that this same mechanism cannot apply due to the lack of transition metal vacancies in the fully dense transition metal layers (in the Li-rich materials the Li in the transition metal layers are removed on charge and the remaining vacancies cluster to accommodate the O 2 ). 14,15…”