F.F. Xing, Z.H. Bi, F. Su, F.Y. Liu, Z.-S. Wu*
Advanced Energy Materials, 2022, Accepted.
Battery-supercapacitor hybrid devices (BSHDs) are aimed at the competitive complements to conventional batteries and supercapacitors by simultaneously achieving high energy density, high power density and excellent cycling stability. However, the cooperative coupling of different energy storage mechanisms between batteries and supercapacitors is still challenging. Therefore, it is important to have a holistic understanding of BSHDs from material synthesis to final application. In this review, we first discuss the basic concept and working principles of BSHDs, which help us identify the related key scientific problems arising from the hybridization. Then we discuss how some of these issues have been mitigated by developing advanced microstructures and engineering the interface between electrode|current collector, electrode|electrolyte and battery-type(b-type)|capacitor-type(c-type) materials. Furthermore, along with shedding light on innovative approaches for expanding the BSHDs’ cell voltage we also summarized unconventional charge-storage mechanisms and device configurations like dual ion and hydrogen ion hybrid supercapacitors to push their performance even higher. Finally, we provide our perspective on the technological challenges and future prospects of BSHDs from both an academic and industrial point of view. We believe this review will serve as a window to look at the past and guide the future development of high-performance BSHDs.