Heterogeneous Nanostructures for Sodium Ion Batteries and Supercapacitors

Abstract

Hybridization of different electrode materials to yield favorable synergistic effects and enhanced function is a focus of current research in developing advanced electrochemical energy‐storage devices. This Focus Review summarizes recent progress in rational design and fabrication of advanced electrode materials with heterogeneous nanostructures and interfaces engineered on the nanometer scale. The hybridization typically involves two or more materials such as metal oxides (or sulfides, carbides, and nitrides) and various forms of nanostructured carbon materials. We focus on two devices: sodium ion batteries and supercapacitors, as well as their integration with other devices to realize multifunctional systems.

Dial the Mechanism Switch of VN from Conversion to Intercalation toward Long Cycling Sodium‐Ion Battery

“…To assess the properties of layered VN for sodium‐ion battery, 2032 type coin‐cells were assembled with Na tablets as counterpart. As shown in Figure 3 a, cyclic voltammetry (CV) is carried out at 1.0 mV s −1 from 0.01 to 3.0 V. A pair of obvious redox peaks appear at 1.35/1.65 V, versus Na/Na + , maintained all cycles, which corresponds to the insertion and removal of sodium ions during discharge and charge 16,27,28. Nevertheless, in the first cycle, there is another peak at 1.0 V appearing during cathode scanning, which is might due to the decomposition of electrolyte or the formation of complex solid electrolyte interface (SEI) 29.…”

Self-branched α-MnO2/δ-MnO2 heterojunction nanowires with enhanced pseudocapacitance

“…There is tremendous demand for energy storage devices that exhibit both high energy density and greater power density than the state-of-the-art lithium ion batteries. [1][2][3][4] As a typical high power candidate, supercapacitors can also deliver energy density comparable to batteries by utilizing high-capacitance electrode materials according to the equation E ¼ 1 2 CV 2 , where E is energy stored in the device, C is capacitance and V is the open-circuit potential. [5][6][7][8][9][10] For supercapacitors, the aim is to boost the energy density without sacrificing the high power capability.…”

A Review on Design Strategies for Carbon Based Metal Oxides and Sulfides Nanocomposites for High Performance Li and Na Ion Battery Anodes

“…Over the years, numerous structure design techniques have been employed to improve the overall performance of the anodes . Figure 1 illustrates the evolution of microstructure in composites over the years.…”