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Conventional graphitic anodes
in lithium-ion batteries cannot provide
high-power densities due to slow diffusivity of
lithium ions in the bulk electrode material.
Here we report photoflash and laser-reduced
free-standing graphene paper as high-rate
capable anodes for lithium-ion batteries.
Photothermal reduction of graphene oxide
yields an expanded structure with micrometer-scale pores, cracks, and intersheet voids. This
open-pore structure enables access to the underlying sheets of graphene for lithium ions and
facilitates efficient intercalation kinetics even at ultrafast charge/discharge rates of >100 C.
Importantly, photothermally reduced graphene anodes are structurally robust and display
outstanding stability and cycling ability. At charge/discharge rates of ¡«40 C, photoreduced
graphene anodes delivered a steady capacity of ¡«156 mAh/ganode continuously over 1000
charge/discharge cycles, providing a stable power density of ¡«10 kW/kganode. Such electrodes
are envisioned to be mass scalable with relatively simple and low-cost fabrication procedures,
thereby providing a clear pathway toward commercialization.
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