Abstract Battery-type electrode materials are utilised in high performance supercapacitors. Herein, graphene/BiOBr (GR/BiOBr) composite is prepared by one-step solvothermal method and firstly used in supercapacitors. The results of the dynamic calculations suggest that the key feature of the GR/BiOBr composite is its battery-like performance. When used as an electrode in a three-electrode system, the GR/BiOBr composite can deliver an excellent specific capacity of 491 C g−1 at 1 A g−1. An asymmetrical supercapacitor cell with a voltage of 1.4 V for the aid of GR/BiOBr (negative electrode) and Ni–Co–Al LDH (positive electrode) is assembled. The symmetrical supercapacitor achieves a high energy density of 29.2 Wh kg−1 corresponding to a power density of 700 W kg−1. This study shows that GR/BiOBr composite has a great potential for high performance supercapacitors.

中文翻译：

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用于高性能非对称超级电容器的电池型石墨烯/BiOBr复合材料

摘要 电池型电极材料用于高性能超级电容器。在此，石墨烯/BiOBr（GR/BiOBr）复合材料通过一步溶剂热法制备，并首次用于超级电容器。动态计算的结果表明 GR/BiOBr 复合材料的关键特征是其类似电池的性能。当用作三电极系统中的电极时，GR/BiOBr 复合材料可以在 1 A g-1 下提供 491 C g-1 的优异比容量。在 GR/BiOBr（负极）和 Ni-Co-Al LDH（正极）的帮助下，组装了一个电压为 1.4 V 的非对称超级电容器电池。对称超级电容器实现了 29.2 Wh kg-1 的高能量密度，对应于 700 W kg-1 的功率密度。