• DOI:10.1021/NN303145J
• Corpus ID: 18450590

Photothermally reduced graphene as high-power anodes for lithium-ion batteries.

@article{Mukherjee2012PhotothermallyRG,
  title={Photothermally reduced graphene as high-power anodes for lithium-ion batteries.},
  author={Rahul Mukherjee and Abhay Varghese Thomas and Ajay Krishnamurthy and Nikhil A Koratkar},
  journal={ACS nano},
  year={2012},
  volume={6 9},
  pages={
          7867-78
        }
}

• R. Mukherjee, A. Thomas, +1 author N. Koratkar
• Published 16 August 2012
• Materials Science, Engineering
• ACS nano

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/g(anode) continuously over 1000 charge/discharge cycles, providing a stable power density of ~10 kW/kg(anode). Such electrodes are envisioned to be mass scalable with relatively simple and low-cost fabrication procedures, thereby providing a clear pathway toward commercialization.