Foldable, high energy density lithium ion batteries

Suresh, Shravan
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Koratkar, Nikhil A. A.
Lu, T.-M. (Toh-Ming), 1943-
Borca-Tasçiuc, Theodorian
Narayanan, Shankar
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Mechanical engineering
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The graphene-draped Si films on CNM exhibit long cycle life (> 1000 charge/discharge steps) with an average specific capacity of ~806 mAh/g. The volumetric capacity averaged over 1000 cycles of charge/discharge is ~2821 mAh/cm³ which is 2 to 5 times higher than what is reported in the literature for Si nanoparticle based electrodes. The graphene-draped Si anode could also be successfully cycled against commercial cathodes in a full-cell configuration. In Chapter 5, an alternate strategy has been explored to stabilize Si films by utilizing the role of a slippery interface in stabilizing Si. In this study, graphene films were used as a buffer layer on which Si films were deposited. Here, instead of a highly elastic matrix (as seen in Chapter 4), a slippery interface was used to stabilize Si. It was observed that due to the slippery interface, the Si films were stable and could retain a capacity of ~900 mAh/g. These Si films also possessed a volumetric capacity of ~5462 mAh/cm³. On the other hand, Si films with a rigid interface were completely eviscerated with a capacity retention of only 180 mAh/g.
August 2017
School of Engineering
Dept. of Mechanical, Aerospace, and Nuclear Engineering
Rensselaer Polytechnic Institute, Troy, NY
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