3D nitrogen-doped graphene foam with encapsulated germanium/nitrogen-doped graphene yolk-shell nanoarchitecture for high-performance flexible Li-ion battery

Runwei Mo, David Rooney, Kening Sun () and Hui Ying Yang ()
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Runwei Mo: Pillar of Engineering Product Development, Singapore University of Technology and Design
David Rooney: School of Chemistry and Chemical Engineering, Queen's University Belfast
Kening Sun: Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology
Hui Ying Yang: Pillar of Engineering Product Development, Singapore University of Technology and Design

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract Flexible electrochemical energy storage devices have attracted extensive attention as promising power sources for the ever-growing field of flexible and wearable electronic products. However, the rational design of a novel electrode structure with a good flexibility, high capacity, fast charge–discharge rate and long cycling lifetimes remains a long-standing challenge for developing next-generation flexible energy-storage materials. Herein, we develop a facile and general approach to three-dimensional (3D) interconnected porous nitrogen-doped graphene foam with encapsulated Ge quantum dot/nitrogen-doped graphene yolk-shell nano architecture for high specific reversible capacity (1,220 mAh g−1), long cycling capability (over 96% reversible capacity retention from the second to 1,000 cycles) and ultra-high rate performance (over 800 mAh g−1 at 40 C). This work paves a way to develop the 3D interconnected graphene-based high-capacity electrode material systems, particularly those that suffer from huge volume expansion, for the future development of high-performance flexible energy storage systems.

Date: 2017
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DOI: 10.1038/ncomms13949

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