Scalable and fast fabrication of graphene integrated micro-supercapacitors with remarkable volumetric capacitance and flexibility through continuous centrifugal coating

• 来源期刊: 能源化学
• 年，卷（期）: 2021,（1）
• 页码范围: 284-290
• 页数: 7页
• 语种: 英文

摘要

Microscale electrochemical energy storage devices,e.g.,micro-supercapacitors(MSCs),possessing tai-lored performance and diversified form factors of lightweight,miniaturization,flexibility and exceptional integration are highly necessary for the smart power sources-unitized electronics.Despite the great pro-gress,the fabrication of MSCs combining high integration with high volumetric performance remains lar-gely unsolved.Herein,we develop a simple,fast and scalable strategy to fabricate graphene based highly integrated MSCs by a new effective continuous centrifugal coating technique.Notably,the resulting highly conductive graphene films can act as not only patterned microelectrodes but also metal-free cur-rent collectors and interconnects,endowing modular MSCs with high integrity,remarkable flexibility,tai-lored voltage and capacitance output,and outstanding performance uniformity.More importantly,the strong centrifugal force and shear force generated in continuous centrifugal coating process lead to gra-phene films with high alignment,compactness and packing density,contributing to excellent volumetric capacitance of～31.8 F cm-3 and volumetric energy density of～2.8 mWh cm-3,exceeding most reported integrated MSCs.Therefore,our work paves a novel way for simple and scalable fabrication of integrated MSCs and offers promising opportunities as standalone microscale power sources for new-generation electronics.