Ultrafast Delamination of Graphite into High-Quality Graphene Using Alternating Currents

摘要

To bridge the gap between laboratory-scale studies and commercial applications, mass production of high quality graphene is essential. A scalable exfoliation strategy towards the production of graphene sheets is presented that has excellent yield (ca. 75%, 1-3 layers), low defect density (a C/O ratio of 21.2), great solution-processability, and outstanding electronic properties (a hole mobility of 430 cm(2) V-1 s(-1)). By applying alternating currents, dual exfoliation at both graphite electrodes enables a high production rate exceeding 20 g h(-1) in laboratory tests. As a cathode material for lithium storage, graphene-wrapped LiFePO4 particles deliver a high capacity of 167 mAh g(-1) at 1C rate after 500 cycles.