The oxidation of graphite powder was reported to enhance the capacity of graphite anodes in Li-ion batteries. Here we present IR-spectroscopic study of the graphite powder modified via oxidation by ozone with the subsequent LIOH or butyl-li treatment compared to the results obtained by "wet" acid oxidation. Ozone treatment leads to the formation of ozonides, C-O-O-C, carboxylic and epoxy groups on graphite surface. Subsequent treatment of ozone modified graphite with LiOH eliminates the majority of C-O containing groups and yields only a Few COOLi surface groups. Treatment of ozonated graphite with butyllithium appears to be more efficient.