Ever-increasing pseudocapacitance in RGO-MnO-RGO sandwich nanostructures for ultrahigh-rate lithium storage

Authors

Tianzhi Yuan, Zhejiang University
Yinzhu Jiang, Zhejiang University
Wenping Sun, University of WollongongFollow
Bo Xiang, Zhejiang University
Yong Li, Zhejiang University
Mi Yan, Zhejiang University
Ben Xu, Northumbria University
S X. Dou, University of WollongongFollow

RIS ID

105527

Publication Details

Yuan, T., Jiang, Y., Sun, W., Xiang, B., Li, Y., Yan, M., Xu, B. & Dou, S. (2016). Ever-increasing pseudocapacitance in RGO–MnO–RGO sandwich nanostructures for ultrahigh-rate lithium storage. Advanced Functional Materials, 26 2198-2206.

Abstract

Lithium ion batteries have attained great success in commercialization owing to their high energy density. However, the relatively delaying discharge/ charge severely hinders their high power applications due to intrinsically diffusion- controlled lithium storage of the electrode. This study demonstrates an ever-increasing surface redox capacitive lithium storage originating from an unique microstructure evolution during cycling in a novel RGO-MnO-RGO sandwich nanostructure. Such surface pseudocapacitance is dynamically in equilibrium with diffusion-controlled lithium storage, thereby achieving an unprecedented rate capability (331.9 mAh g−1 at 40 A g−1, 379 mAh g−1 after 4000 cycles at 15 A g−1) with outstanding cycle stability. The dynamic combination of surface and diffusion lithium storage of electrodes might open up possibilities for designing high-power lithium ion batteries.