3D Structured Graphene Anodes for Alkali Metal Ion Storage Applications

Abstract

Electrochemical exfoliation of graphite into graphene has emerged as a promising manufacturing method for the fast production of graphene at a low cost. We will first discuss our recent efforts to understand the electrochemical exfoliation process of graphite under various electrolyte conditions to control the structures of graphene products.1 Then, we will introduce the stacking and defect engineering processes to assemble 3D structured graphene electrodes.2, 3 The 3D graphene anodes delivered enhanced capacities for Li-, Na-, K-ion storage due to the effective utilization of surface defects. In particular, the 3D graphene anodes can exhibit superior charge-storage performance under extremely low-temperature conditions. We reveal that the role of the surface-charge storage mechanism in improving the charge storage performance under low-temperature conditions.References Lee, H.; Choi, J. I.; Park, J.; Jang, S. S.; Lee, S. W. Role of anions on electrochemical exfoliation of graphite into graphene in aqueous acids. Carbon 2020, 167, 816-825.Lee, B.; Kim, M.; Kim, S.; Nanda, J.; Kwon, S. J.; Jang, H. D.; Mitlin, D.; Lee, S. W. High Capacity Adsorption—Dominated Potassium and Sodium Ion Storage in Activated Crumpled Graphene. Adv. Energy Mater. 2020, 10, 1903280.Lee, M. J.; Lee, K.; Lim, J.; Li, M.; Noda, S.; Kwon, S. J.; DeMattia, B.; Lee, B.; Lee, S. W. Outstanding Low-Temperature Performance of Structure-Controlled Graphene Anode Based on Surface-Controlled Charge Storage Mechanism. Adv. Funct. Mater. 2021, 31, 2009397.