A Comparative Spectroscopic Study of Graphene - coated vs Pristine Li ( Mn , Ni , Co ) Oxide Materials for Lithium - ion Battery Cathodes
نویسندگان
چکیده
The structural properties of pristine and graphene-coated Li(Li0.2Mn0.54Ni0.13Co0.13)O2 materials were studied by the spectroscopic methods, such as Raman spectroscopy, FTIR, and synchrotron XAS. The result from Raman spectroscopy implies that the graphene coating may suppress the monoclinic phase in the pristine material and thus lead to improved stability of the cathode. The combined analyses including the synchrotron XAS have vital implications for developing in situ methods to investigate the phase transitions that are related with the stability of the active material and capacity fading during electrochemical cycling of the lithium-ion batteries.
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