As a typical electrode material in Faraday supercapacitors (FSs), Ni(OH)₂ has some intrinsic issues such as low electrical conductivity and structural instability, resulting in its low performance. In view of these issues, we design a multifunctional nanostructure, rigid nanosheet-interlaced structure of Ni–Co LDH/graphene to improve the electrical conductivity and structural stability of Ni(OH)₂. Under the high shear applied by a high shear mixer (HSM) and the regulation of polyvinylpyrrolidone (PVP), the designed structure is realized. Benefitting from the well-designed structure and improved electrical conductivity of the graphene sheet-high homogenization, Ni–Co LDH/graphene presents the expected performance. It exhibits a high specific capacity of 1020 C g⁻¹ at a low current density of 2.7 A g⁻¹ and excellent high rate performance (637.5 C g⁻¹ at 62.5 A g⁻¹). The asymmetrical supercapacitors (ASCs) assembled with the composite as the positive material show high energy density (86.5 W h kg⁻¹ at a power density of 695.7 W kg⁻¹). Due to the improved structural stability, the ASCs also exhibit high cycling stability (a capacity retention of 97.8% after 10 000 charge–discharge cycles).

中文翻译：

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微观结构和石墨烯片高均质性在Ni-Co LDH的高倍率能力和循环稳定性中的关键作用

作为法拉第超级电容器（FSs）中的典型电极材料，Ni（OH）₂具有一些固有的问题，例如低电导率和结构不稳定性，从而导致其性能低下。针对这些问题，我们设计了Ni-Co LDH /石墨烯的多功能纳米结构，刚性纳米片交错结构，以提高Ni（OH）_2的电导率和结构稳定性。在高剪切混合机（HSM）施加高剪切力和聚乙烯吡咯烷酮（PVP）调节的条件下，实现了设计结构。Ni-Co LDH /石墨烯得益于精心设计的结构和改进的石墨烯片的电导率（高均质性），具有预期的性能。它表现出1020 C g ^-1的高比容在2.7克的低电流密度^-1（637.5 C g还和优异的高倍率性能^-1 62.5 A G ^-1）。与复合组装作为正极材料显示出高的能量密度（86.5 W时公斤不对称超级电容器（的ASC）^-1在695.7千克w ^的功率密度^-1）。由于改善了结构稳定性，ASC还具有较高的循环稳定性（在进行10000次充放电循环后，容量保持率为97.8％）。