Journal
ACS NANO
Volume 6, Issue 9, Pages 7867-7878Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn303145j
Keywords
graphene; lithium-ion battery; high rower; rate capability; cycle life
Categories
Funding
- USA National Science Foundation [0969895]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0969895] Funding Source: National Science Foundation
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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 similar to 40 C, photoreduced graphene anodes delivered a steady capacity of similar to 156 mAh/g(anode) continuously over 1000 charge/discharge cycles, providing a stable power density of similar to 10 kW/ka(anode). 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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