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

• Published in: Angewandte Chemie International Edition Vol. 56; no. 23; pp. 6669 - 6675
• Main Authors: Yang, Sheng, Ricciardulli, Antonio Gaetano, Liu, Shaohua, Dong, Renhao, Lohe, Martin R., Becker, Alfons, Squillaci, Marco A., Samorì, Paolo, Müllen, Klaus, Feng, Xinliang
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 01.06.2017; Wiley-VCH Verlag
• Edition: International ed. in English
• Subjects: cathode materials; Chemical Sciences; electrochemistry; Electrode materials; Exfoliation; field-effect transistor; Graphene; Graphite; graphite exfoliation; Hole mobility; Laboratories; Laboratory tests; Lithium; Mass production; Material chemistry; cathode materials; field-effect transistor; electrochemistry; graphite exfoliation; graphene
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.201702076

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 cm2 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 1 C rate after 500 cycles. A great alternative: A facile, cost‐effective and highly efficient strategy has been developed to delaminate graphite into high‐quality graphene by means of alternating currents. This procedure shows great potential to bridge the gap between laboratory‐scale research and commercial applications.