3D nitrogen-doped graphene foam with encapsulated germanium/nitrogen-doped graphene yolk-shell nanoarchitecture for high-performance flexible Li-ion battery.
3D nitrogen-doped graphene foam with encapsulated germanium/nitrogen-doped graphene yolk-shell nanoarchitecture for high-performance flexible Li-ion battery.
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DOI：
10.1038/ncomms13949
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发表时间：
2017-01-04
影响因子：
16.6
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中科院分区：
文献类型：
--
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柔性电化学储能装置作为柔性和可穿戴电子产品领域的重要动力源，受到了广泛的关注。然而，如何合理设计一种具有良好柔韧性、高容量、快速充放电和长循环寿命的新型电极结构，仍然是发展下一代柔性储能材料的长期挑战。在这里，我们开发了一种简单而通用的方法来制备三维(3D)互联的多孔氮掺杂石墨烯泡沫，该泡沫具有封装的Ge量子点/氮掺杂石墨烯蛋黄壳纳米结构，具有高比可逆容量(1,220 mAh g−1)、长循环能力(第二次循环到1,000次循环的可逆容量保持率超过96%)和超高倍率性能(40℃时超过800 mAh g−1)。这项工作为未来高性能柔性储能系统的发展奠定了基础，为发展基于三维互联石墨烯的大容量电极材料系统，特别是那些遭受巨大体积膨胀的电极材料系统铺平了道路。储能材料的发展取决于大容量、柔性、快速充放电和长循环寿命的电极的设计。在这里，作者开发了基于氮掺杂石墨烯的具有蛋黄壳结构的封装Ge量子点的电极。
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. The development of materials for energy storage hinges on the design of electrodes with large capacity, flexibility, fast charge–discharge rate and long cycling lifetime. Here, the authors develop electrodes based on nitrogen doped graphene with encapsulated Ge quantum dots with yolk-shell architecture.
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影响因子：
32.5
作者：
Li, Zhi;Xu, Zhanwei;Mitlin, David
通讯作者：
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