The critical contribution of unzipped graphene nanoribbons to scalable silicon–carbon fiber anodes in rechargeable Li-ion batteries
The critical contribution of unzipped graphene nanoribbons to scalable silicon–carbon fiber anodes in rechargeable Li-ion batteries
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DOI：
10.1016/j.nanoen.2015.07.017
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发表时间：
2015-09
期刊：
影响因子：
17.6
通讯作者：
Yong Seok Kim;Ghazal Shoorideh;Yevgen Zhmayev;Jaehyuk Lee;Zhong Li;B. Patel;S. Chakrapani;J. Park;Sangho Lee;Y. Joo
中科院分区：
文献类型：
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作者：
Yong Seok Kim;Ghazal Shoorideh;Yevgen Zhmayev;Jaehyuk Lee;Zhong Li;B. Patel;S. Chakrapani;J. Park;Sangho Lee;Y. Joo
我们将石墨烯纳米带（GNRs）从多壁碳纳米管（MWCNT）上解链到硅碳（Si/C）纳米纤维中，不仅增强了杂化Si/C纤维，而且还增加了纤维的导电性和电荷传输能力。我们证明，GNRs是有前途的组件，用于改善可充电锂离子电池的性能，由于其独特的纳米结构和性能。采用水基静电纺丝技术制备了GNR/Si/C纤维。所得纤维在0.5C下表现出大于1800 mA·h/g的高可逆容量，在1C的充/放电速率下表现出1400 mA·h/g的优异性能，并且没有容量衰减。这种优异的性能应归功于通过引入可弯曲的、柔性的、导电的和高纵横比的GNRs来增强纤维的电荷和质量传递能力。用GNR/Si/C纤维制成的电极比用Si/C纤维制成的电极更耐用，并且在循环后不表现出显著的体积和形态变化。此外，GNR/Si/C纤维阳极在全电池配置中进行测试，其中它们显示出约100%的稳定重量容量。1400 mA h/阳极，25次循环。
We have incorporated graphene nanoribbons (GNRs) which are unzipped from multi-wall carbon nanotubes (MWCNT) into silicon–carbon (Si/C) nanofibers, not only to reinforce hybrid Si/C fibers, but also to increase the electrical conductivity and charge transport capability of fibers. We demonstrated that GNRs are promising components for improving the rechargeable Li-ion battery performance due to their unique nanostructures and properties. Water based electrospinning, an easily scalable and environmentally benign process, was utilized to fabricate GNR/Si/C fibers. The resulting fibers exhibited a high reversible capacity of more than 1800 mA h/g at 0.5 C, and an excellent performance of 1400 mA h/g with no capacity fading at a charge/discharge rate of 1 C. This outstanding performance should be attributed to the enhanced charge and mass transfer ability of fibers by incorporation of ultrathin, flexible, conductive, and high aspect ratio GNRs. Electrodes made with GNR/Si/C fibers are more durable than ones with Si/C fibers, and do not exhibit dramatic volume and morphology changes after cycling. Moreover, GNR/Si/C fiber anodes were tested in a full-cell configuration where they displayed a steady gravimetric capacity of ca. 1400 mA h/ganodefor 25 cycles.