Fourier-transform infrared spectroscopic studies on the solid electrolyte interphase formed on Li-doped spinel Li1.05Mn1.96O4 cathode

Fourier-transform infrared (FTIR) spectroscopy has been used to identify the solid electrolyte interphase (SEI) formed on Li-doped spinel Li 1.05 Mn 1.96 O 4 cathode. The major components in the SEI have been assigned, and the formation and evolution of the SEI over the initial charge-discharge cycle are discussed. By Fourier-transform infrared spectroscopy, it has been found that during the charge-discharge process, the SEI can be directly formed on the Li 1.05 Mn 1.96 O 4 cathode, and is mainly composed of R-CO 3 Li and Li 2 CO 3 . In terms of composition, it is very similar to those formed on a carbon anode. In the initial cycle, the formation of R-CO 3 Li begins at 4.10V during the charging process, and becomes more distinct with increasing charge voltage. The formation of Li 2 CO 3 begins at 4.10V during the discharge process, and becomes more distinct with decreasing discharge voltage. The SEI becomes more evident over subsequent cycles.

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