C60/Na4FeO3/Li3V2(PO4)3/soft carbon quaternary hybrid superstructure for high-performance battery-supercapacitor hybrid devices

Xudong Zhang,Xiaolong Xu,Guogang Xu,Wen He,Jiefang Zhu,Yuebo Hu

doi:10.1038/s41427-019-0189-8

Abstract

To develop battery-supercapacitor hybrid devices with high energy and power densities, we propose a rational design of a quaternary hybrid superstructure by using a high-energy biotemplate. This new superstructure is composed of stable fullerene C60 nanocages, electroactive Na4FeO3, high-energy Li3V2(PO4)3 and soft carbon as well as tubular ordered mesoporous channels. This design takes advantage of the unique properties of each component, resulting in nanocomposites with synergistic effects to improve the charge transfer and energy storage. We found that this quaternary hybrid electrode has both high energy and power densities as well as a long cycling life in a Li/Na mixed-ion electrolyte, outperforming a multitude of other battery-supercapacitor hybrid devices reported thus far. The charge storage mechanisms of this hybrid superstructure are proposed for optimizing the electrode design.

Highlights

Hybrid energy-storage devices can break the energy density limitation of traditional electrochemical capacitors and the kinetic limitation of batteries
C60/NFO/high-energy Li3V2(PO4)3 (HE-LVP)/soft carbon (SC) sample synthesized at 700 °C has smaller primary crystallite size and strain (Table S2)
The strains of LVP and NFO in C60/NFO/HE-LVP/SC are 0.16% and 0.13%, respectively. These results indicate that the crystal structure features of LVP and NFO in the samples synthesized at different temperatures can be controlled by adjusting the synthesis temperature

Summary

Introduction

Hybrid energy-storage devices can break the energy density limitation of traditional electrochemical capacitors and the kinetic limitation of batteries. C60/NFO/HE-LVP/SC superstructure with tubular ordered mesopores is due to the self-assembly function of the Na2ATP high-energy biotemplate and the optimization of the freeze-drying parameters.

Results

Conclusion