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Lithium-ion electrochemical intercalation of few-layer graphene. Dr Rui Zhang University of Manchester

ABSTRACT: Intercalation of layered materials, such as graphite and transition metal dichalcogenides, is a powerful tool to tune the material’s optical, electronic, and magnetic properties and meanwhile plays a key role in energy storage. Two-dimensional materials particularly a bilayer system, as the basic building block for bulk layered crystals, provide a promising platform for fundamental investigation of the intercalation dynamics and storage capacity by eliminating the staging effect and stacking disorders usually found in bulk systems.

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Here I will report our recent study of device-level lithium intercalation of few-layer graphene employing the previously developed in-situ Hall measurement method. In the study, we have discovered: 1. drastic cycle-dependent intercalation behaviour, including dynamics and capacity, for bilayer graphene; 2. abnormal dependence of lithium storage capacity on the number of layers of few-layer graphene; 3. reproducible control of lithium diffusion in the van der Waals gap of bilayer graphene driven by local electrostatic gating. The findings shed further light on the lithium intercalation process and could also open a new path for control of van der Waals gap confined ionic transport.

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