posted on 2021-05-24, 20:14authored byJianyu Zhang, Hosop Shin, Wei Lu
We
show a top-down synthesis approach to mass-produce phosphorene–graphene
nanosheet composites with superior cycle stability and rate capability.
Currently, using exfoliation to achieve two-dimensional (2D) materials
is primarily limited to pure crystals. We discover that high-quality
nanoscale 2D composite phosphorene–graphene sheets can be directly
exfoliated from extremely low-cost bulk three-dimensional (3D) black
phosphorus–graphite composites synthesized by mechanical milling
while maintaining the chemical bonding and intimate electronic contact
between 2D composite layers. The hybrid phosphorene–graphene
material delivers high reversible capacities of 2030, 2003, and 1597
mAh/g at high current densities of 2, 4, and 6 A/g, respectively.
Quantifying the dimensional electrochemical performance, we show that
2D phosphorene–graphene nanosheets not only have excellent
electrochemical kinetics for fast lithium-ion diffusion and storage
but also maintain the overall structural robustness of the entire
electrode for long-term cyclability. This scalable synthesis paves
the way for the practical application of phosphorene–graphene
materials in batteries.