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Hierarchically Well-Developed Porous Graphene Nanofibers Comprising N-Doped Graphitic C-Coated Cobalt Oxide Hollow Nanospheres As Anodes for High-Rate Li-Ion Batteries.
Small ( IF 13.3 ) Pub Date : 2020-07-02 , DOI: 10.1002/smll.202002213
Jae Seob Lee 1 , Min Su Jo 1 , Rakesh Saroha 1 , Dae Soo Jung 2 , Young Hoe Seon 1 , Jun Su Lee 1 , Yun Chan Kang 3 , Dong-Won Kang 4 , Jung Sang Cho 1
Affiliation  

Hierarchically well‐developed porous graphene nanofibers comprising N‐doped graphitic C (NGC)‐coated cobalt oxide hollow nanospheres are introduced as anodes for high‐rate Li‐ion batteries. For this, three strategies, comprising the Kirkendall effect, metal–organic frameworks, and compositing with highly conductive C, are applied to the 1D architecture. In particular, NGC layers are coated on cobalt oxide hollow nanospheres as a primary transport path of electrons followed by graphene‐nanonetwork‐constituting nanofibers as a continuous and secondary electron transport path. Superior cycling performance is achieved, as the unique nanostructure delivers a discharge capacity of 823 mAh g−1 after 500 cycles at 3.0 A g−1 with a low decay rate of 0.092% per cycle. The rate capability is also noteworthy as the structure exhibits high discharge capacities of 1035, 929, 847, 787, 747, 703, 672, 650, 625, 610, 570, 537, 475, 422, 294, and 222 mAh g−1 at current densities of 0.5, 1.5, 3, 5, 7, 10, 12, 15, 18, 20, 25, 30, 40, 50, 80, and 100 A g−1, respectively. In view of the highly efficient Li+ ion/electron diffusion and high structural stability, the present nanostructuring strategy has a huge potential in opening new frontiers for high‐rate and long‐lived stable energy storage systems.

中文翻译:

分层发达的多孔石墨烯纳米纤维,包含N掺杂的石墨C涂层氧化钴空心纳米球作为高倍率锂离子电池的阳极。

分层发展良好的多孔石墨烯纳米纤维是由掺N的石墨C(NGC)涂层的氧化钴空心纳米球组成的,被用作高倍率锂离子电池的阳极。为此,将一类策略(包括Kirkendall效应,金属有机框架以及高导电C的复合)应用于一维体系结构。尤其是,NGC层被涂覆在氧化钴空心纳米球上,作为电子的主要传输路径,然后是石墨烯-纳米网络-构成纳米纤维的连续和二次电子传输路径。实现了卓越的循环性能,因为独特的纳米结构在3.0 A g -1下经过500次循环后可提供823 mAh g -1的放电容量每个周期的衰减率仅为0.092%。由于结构展现出高放电容量1035、929、847、787、747、703、672、650、625、610、570、537、475、475、422、294和222 mAh g -1,因此速率能力也值得注意在电流密度分别为0.5、1.5、3、5、7、10、12、15、18、20、25、30、40、50、80和100 A g -1时。鉴于高效的Li +离子/电子扩散和高度的结构稳定性,当前的纳米结构策略在为高​​速率和长寿命的稳定储能系统开辟新领域方面具有巨大潜力。
更新日期:2020-08-14
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