Rational design of binder, conductive additive and current collector-free Si/reduced graphene oxide film for superior lithium storage

Si has been considered as an appealing anode material for high-performance lithium-ion batteries due to its high theoretical capacity. However, the large volume variation limits its practical application. Herein, a binder-, conductive additive- and current collector-free Si/reduced graphene oxide film has been constructed via a simple thermal-reduction method. In the film, Si nanoparticles are encapsulated by reduced graphene oxide, which can accommodate the volume change of Si during cycling efficiently. When utilized as a negative electrode, the Si/reduced graphene oxide film has displayed a high reversible capacity of 1733.4 mAh g-1 after 50 cycles at 200 mA g-1. Importantly, the electrochemical impedance spectroscopy results suggest that the composite film possesses more efficient electrochemical reaction kinetics. The strategy reported in this work may supply a facile preparation route for other metal or metal oxides/reduced graphene oxide films.