Practical battery electrodes need enough active material mass loadings in order to store sufficient energy within the limited device footprint. However, most advanced electrode studies use small amounts of active materials due to scalability limitations of the fabrication methods. For example, the conventional slurry-based method has been proven challenging in preparing high sulfur (S) mass loading cathodes with high S contents for lithium-sulfur (Li-S) batteries. In this presentation, we discuss the use of holey graphene as a unique and versatile conductive scaffold to enable high mass loading electrodes for advanced battery chemistries. As a derivative of graphene, holey graphene exhibits nanometer-sized holes through the nanosheet thickness for enhanced ion transport. The presence of these holes on each nanosheet also enables the holey graphene powder to be compressed into shapes without the need of solvent. The dry compressibility allows holey graphene to be pressed by itself or to serve as a matrix to host active battery materials or catalysts for enhanced battery reactions, all with high mass loadings. The broad applications of dry pressable holey graphene electrodes, such as lithium oxygen/carbon dioxide (Li-O<sub>2</sub>/CO<sub>2</sub>), lithium sulfur/selenium (Li-S/Se), various lithium ion chemistries, and solid-state batteries, will be presented. Selected recent examples will be discussed in more detail.

High mass loading battery electrode architectures with Holey graphene scaffolds

ACS Spring Meeting 2021

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.