Homogeneously assembling like-charged WS2 and GO nanosheets lamellar composite films by filtration for highly efficient lithium ion batteries

It is well known that the nanocomponents with opposite charges can be easily assembled into hybrid composites via electrostatic interaction , but it is difficult for like-charged nanomaterials . Here, we developed a general method to directly assemble lamellar composite paper composed of both negative-charged WS 2 and graphene oxide (GO) nanosheets from their aqueous dispersion through filtration process . After hydrothermal reduction, the flexible lamellar WS 2 /reduced-graphene oxide (rGO) paper was evaluated as binder-free anodes for Li-ion batteries, which presented a reversible capacity of 697.7   mA   h   g −1 after 100 cycles, 8 times higher than 88.5   mA   h   g −1 of pure WS 2 nanosheets and 60.2   mA   h   g −1 of rGO, excellent cyclic stability and good rate capacity. In the uniformly alternated lamellar structures , rGO nanosheets efficiently prevent the restacking of WS 2 sheets, increase the conductivity of the electrode, and sustain the volume expansion during Li + insertion/extraction, which significantly improved the electrochemical performances. This simple filtration assembling method provides a general and efficient way to synthesize functional composite films from like-charged colloid solutions.