Surface modification of graphite by low‐temperature oxygen plasma and SnO2FeO(OH) coatings for lithium storage

Abstract

AbstractGraphite powders are exfoliated by Li+/Na+ co‐intercalation to obtain exfoliated graphite, and then the surfaces are modified with oxygen‐containing functional groups by oxygen plasma etching to alter the chemical properties of surface. For advanced graphite anodes of lithium ions batteries, here fine‐structured SnO2FeO(OH) coatings are constructed on the oxidated surfaces of graphite by an electrostatic adsorption method. Electrochemical tests show that surface modified graphite has higher capacity and better rate performance than pristine graphite, and the specific discharge capacity is reached to 400 mAh g−1 at a current of 37.2 mA g−1 (0.1C), which is increased by 27.8% compared with the pristine graphite anode.