Abstract
Supercapacitors have gained e wide attention because of high power density, fast charging and discharging, as well as good cycle performance. Recently, expanded graphite (EG) has been widely investigated as an effective electrode material for supercapacitors owing to its excellent physical, chemical, electrical, and mechanical properties. Based on charge storage mechanism, supercapacitors have been divided into symmetric, asymmetric, and hybrid supercapacitors. Here, we review the study progress of EG-based materials to be electrode materials. Furthermore, we discuss the application prospects and challenges of EG-based materials in supercapacitors.
Highlights
Owing to the reduction of fossil fuel reserves and global warming, developing alternative clean energy sources, including solar, wind, as well as tidal energy is urgent [1,2,3]
As-prepared S-PEDOT/EG10 composite to be supercapacitor electrode material exhibited specific capacitance with 139.6 F g−1 under 1.0 A g−1
expanded graphite (EG)-based symmetric supercapacitor as a traditional electrochemical energy storag suffers from poor performance
Summary
Owing to the reduction of fossil fuel reserves and global warming, developing alternative clean energy sources, including solar, wind, as well as tidal energy is urgent [1,2,3] They are intermittent energy sources affected by the natural environment; they need to be converted and stored, which has drawn researchers’ interest in the R&D of sustainable energy conversion and storage technologies [2,4,5,6]. Rechargeable batteries have been promising within consumer electronics together with electric vehicles because of their high energy density. Their power density is limited due to the slow ion insertion/deintercalation process in the electrode material [3,7,8,9,10]. Most studies have focused on developing high-performance supercapacitor electrode materials. We summarize the challenges and opportunities for developing EG and future research on supercapacitors
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