SnO_2 nanoparticles anchored on chlorinated graphene formed directly on Cu foil as binder-free anode materials for lithium-ion batteries

摘要

Enhanced cyclic performance is a great challenge for the application of fin dioxide-based anode in lithium-ion batteries. In this study, a facile strategy using one-step heat treatment at low temperature is developed to synthesize SnO2 nanoparticles anchored on chlorinated graphene as binder-free electrodes that exhibit a long cycling life up to 400 cycles with a discharge capacity of 1008 mA h g(-1). After assessment of the rate capability, the cell is tested for another 1600 cycles showing a reversible capacity stabile at 559 mA h g(-1). Theoretical calculation shows that the doping of chlorine atom can not only enhance electrical conductivity of graphene, but also increase the adsorption energies (- 2.62 eV for SnO2@rGO-Cl vs. -0.03 eV for SnO2@rGO) between graphene and SnO2 nanoparticles, which preserve the integrity of electrodes during cycling.