Three dimensional Graphene aerogels as binder-less, freestanding, elastic and high-performance electrodes for lithium-ion batteries.
Three dimensional Graphene aerogels as binder-less, freestanding, elastic and high-performance electrodes for lithium-ion batteries.
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三维石墨烯气凝胶作为锂离子电池的无粘合剂、独立式、弹性和高性能电极
DOI：
10.1038/srep27365
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发表时间：
2016-06-06
影响因子：
4.6
通讯作者：
Liu H
中科院分区：
文献类型：
--
作者：
Chen Z;Li H;Tian R;Duan H;Guo Y;Chen Y;Zhou J;Zhang C;Dugnani R;Liu H
在这项工作中，展示了如何通过环保和简单的工艺制备多孔石墨烯气凝胶，作为锂离子电池的电极。所提出的石墨烯骨架具有优异的性能，包括高可逆容量、优异的循环稳定性和倍率能力。采用比目前电池制造中使用的温度低得多的温度(75 °C)进行自组装，从而为工业生产提供了潜在的显著节省。在600 °C下热处理后，SnO2纳米粒子与还原的石墨烯之间形成的SnC-O键将引发协同效应，提高电化学性能。XPS图谱揭示了锡-碳-氧键的形成。电极材料的扫描电子显微镜和透射电子显微镜图像显示，石墨烯气凝胶的三维网络和SnO2颗粒均匀分布在石墨烯薄片上。最后，通过恒流充放电循环测试了样品作为锂离子电池活性负极材料的电化学性能，这一结果在本文中得到了充分的描述。
In this work it is shown how porous graphene aerogels fabricated by an eco-friendly and simple technological process, could be used as electrodes in lithium- ion batteries. The proposed graphene framework exhibited excellent performance including high reversible capacities, superior cycling stability and rate capability. A significantly lower temperature (75 °C) than the one currently utilized in battery manufacturing was utilized for self-assembly hence providing potential significant savings to the industrial production. After annealing at 600 °C, the formation of Sn-C-O bonds between the SnO2nanoparticles and the reduced graphene sheets will initiate synergistic effect and improve the electrochemical performance. The XPS patterns revealed the formation of Sn-C-O bonds. Both SEM and TEM imaging of the electrode material showed that the three dimensional network of graphene aerogels and the SnO2particles were distributed homogeneously on graphene sheets. Finally, the electrochemical properties of the samples as active anode materials for lithium-ion batteries were tested and examined by constant current charge–discharge cycling and the finding fully described in this manuscript.