Electrode properties of defect-introduced graphenes for lithium-ion batteries

摘要

Electrochemical properties of defect-introduces graphenes for lithium ion batteries were investigated. Graphene sheets (GSs) were prepared from graphite through treating with oxidizing agent followed by rapid thermal exfoliation. Defect concentration was controlled by selecting the number of times of oxidation of graphite. GSs electrodes derived from 1, 2 and 3 times-oxidized graphite oxides exhibited a high charge capacity of 1250, 1790 and 2310 mAh g~(-1), respectively, at the 20th cycle at a current density of 100 mA g~(-1). The enhanced capacity is assumed to be due to additional lithium storage sites such as defects and edges.