Surface Modification of Nature Graphite by Phenolic Resin CarbonCoating for Improvement Cyclic Performances in Lithium Ion Battery

摘要

Natural graphite was coated with different concentration of phenolic resin and methane solution. To obtainmodified graphite, the coated natural graphite was further carbonized at temperature of 1000for one hour under N2stream after removing solvent of methane. The surface morphology and microstructure of modified graphite wereinvestigated with SEM and XRD, respectively. The computer-controlled constant-current cycler investigated charge anddischarge performances. Results showed that the phenolic resin carbon with disordered structure formed on the surfaceof graphite could protect the graphite from exfoliation and improve its cyclic performances successfully. The reversiblecapacity and coulombic efficiencies of modified graphite were higher than that of natural graphite during charge anddischarge cycling tests at a rate of 15 mAg-1 -1. It is confirmed that modified graphite has an advantage for an applicationof high power density lithium ion battery.