A high-performance supercapacitor-battery hybrid energy storage device based on graphene-enhanced electrode materials with ultrahigh energy density
A high-performance supercapacitor-battery hybrid energy storage device based on graphene-enhanced electrode materials with ultrahigh energy density
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DOI：
10.1039/c3ee40509e
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发表时间：
2013-04
影响因子：
32.5
通讯作者：
Fan Zhang;Tengfei Zhang;Xi Yang;Long Zhang;Kai Leng;Yi Huang;Yongsheng Chen
中科院分区：
文献类型：
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作者：
Fan Zhang;Tengfei Zhang;Xi Yang;Long Zhang;Kai Leng;Yi Huang;Yongsheng Chen
为了追求更高的能量密度而不牺牲功率密度，我们设计并制造了一种超级电容器-电池混合储能装置——将电化学双层电容（EDLC）型正极与锂离子电池型负极相结合。石墨烯被引入到两个电极中：具有高比容量的Fe3O4/石墨烯（Fe3O4/G）纳米复合材料作为负极材料，以及具有高表面积（∼3355 m2 g−1）的石墨烯基三维多孔碳材料（3DGraphene）作为正极材料。 Fe3O4/G纳米复合材料表现出高可逆比容量，在90 mA g−1时超过1000 mA h g−1，在2700 mA g−1时保持在704 mA h g−1，以及优异的倍率性能和改善的循环稳定性。同时3D石墨烯正极还表现出良好的电化学性能。借助这两种石墨烯增强电极材料并采用业界最佳推荐的评估方法，混合超级电容器Fe3O4/G//3DGraphene表现出147 W h kg−1的超高能量密度（功率密度为150 W kg−1），即使在2587 W kg−1的高功率密度下也能保持86 W h kg−1，这是迄今为止报道的混合超级电容器的最高值。此外，混合超级电容器的能量密度与锂离子电池相当，功率密度也达到对称超级电容器的水平，这表明混合超级电容器可能是未来非常有前途的快速高效储能的新型储能系统。
In pursuing higher energy density with no sacrifice of power density, a supercapacitor-battery hybrid energy storage device—combining an electrochemical double layer capacitance (EDLC) type positive electrode with a Li-ion battery type negative electrode—has been designed and fabricated. Graphene is introduced to both electrodes: an Fe3O4/graphene (Fe3O4/G) nanocomposite with high specific capacity as negative electrode material, and a graphene-based three-dimensional porous carbon material (3DGraphene) with high surface area (∼3355 m2 g−1) as positive electrode material. The Fe3O4/G nanocomposite shows a high reversible specific capacity exceeding 1000 mA h g−1 at 90 mA g−1 and remaining at 704 mA h g−1 at 2700 mA g−1, as well as excellent rate capability and improved cycle stability. Meanwhile the 3DGraphene positive electrode also displays great electrochemical performance. With these two graphene-enhanced electrode materials and using the best recommended industry evaluation method, the hybrid supercapacitor Fe3O4/G//3DGraphene demonstrates an ultrahigh energy density of 147 W h kg−1 (power density of 150 W kg−1), which also remains of 86 W h kg−1 even at high power density of 2587 W kg−1, so far the highest value of the reported hybrid supercapacitors. Furthermore, the energy density of the hybrid supercapacitor is comparable to lithium ion batteries, and the power density also reaches that of symmetric supercapacitors, indicating that the hybrid supercapacitor could be a very promising novel energy storage system for fast and efficient energy storage in the future.