5 years ago

Lithium-Ion Insertion Properties of Solution-Exfoliated Germanane

Lithium-Ion Insertion Properties of Solution-Exfoliated Germanane
Bruce S. Dunn, Jeffrey J. Schwartz, Andrew C. Serino, Chris B. Kang, Paul S. Weiss, Sarah H. Tolbert, Michael T. Yeung, Richard B. Kaner, Jesse S. Ko
The high theoretical energy density of alloyed lithium and germanium (Li15Ge4), 1384 mAh/g, makes germanium a promising anode material for lithium-ion batteries. However, common alloy anode architectures suffer from long-term instability upon repetitive charge–discharge cycles that arise from stress-induced degradation upon lithiation (volume expansion >300%). Here, we explore the use of the two-dimensional nanosheet structure of germanane to mitigate stress from high volume expansion and present a facile method for producing stable single-to-multisheet dispersions of pure germanane. Purity and degree of exfoliation were assessed with scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. We measured representative germanane battery electrodes to have a reversible Li-ion capacity of 1108 mAh/g when cycled between 0.1 and 2 V vs Li/Li+. These results indicate germanane anodes are capable of near-theoretical-maximum energy storage, perform well at high cycling rates, and can maintain capacity over 100 cycles.

Publisher URL: http://dx.doi.org/10.1021/acsnano.7b02589

DOI: 10.1021/acsnano.7b02589

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