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Authors: Y. Shao-Horn and C. Thompson

IRG-I Highlight: All-Carbon Nanofiber Electrodes for High-Energy Rechargeable Li-air Batteries. Michael F. Rubner, Massachusetts Institute of Technology, DMR 0819762. Authors: Y. Shao-Horn and C. Thompson

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Authors: Y. Shao-Horn and C. Thompson

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  1. IRG-I Highlight: All-Carbon Nanofiber Electrodes for High-Energy Rechargeable Li-air Batteries Michael F. Rubner, Massachusetts Institute of Technology, DMR 0819762 Authors: Y. Shao-Horn and C. Thompson Adoption of fully-electric vehicles will require innovations in battery storage technologies beyond what is currently achievable with lithium-ion chemistries. Li-O2 batteries are currently being investigated as an alternative to lithium-ion systems because they are projected to achieve ~5 times higher gravimetric energy density in the fully discharged state and ~3 times higher gravimetric energy density in packaged cells. MIT MRSEC reseachers have developed binder-free, aligned carbon nanofiber electrodes, which provide enhanced gravimetric energy densities in Li-O2 cells. These electrodes have tremendous void volume (>90%), which serves to accommodate the formation and dissolution of Li2O2 during discharge and charge. Further, the unique structure of these electrodes enables facile ex situ SEM studies of the morphology of the deposited Li2O2, enabling insights into electrode structure optimization. Carbon nanofiber electrodes enable a 4-fold improvement in gravimetric energy over state-of-the-art lithium-ion electrodes at comparable gravimetric powers, while enabling facile imaging of the Li2O2 discharge product. R. R. Mitchell, B. M. Gallant, C. V. Thompson, Y. Shao-Horn, All-carbon-nanofiber electrodes for high-energy rechargeable Li–O2 batteries. Energ Environ Sci. 4, 2952 (2011).

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