Electroactive materials with high electrochemical activity, good rate capability and excellent cycling stability are urgently needed for hybrid supercapacitors, but achieving those performances at the same time is still a big challenge. Here, α phase nickel−cobalt−manganese hydroxide (NiCoMn−OH) with a flower-like structure is synthesized and used as the battery materials for hybrid supercapacitor. The NiCoMn−OH exhibits strong synergetic electrochemistry between the transition metals, which contributes better charge storage performances. The NiCoMn−OH shows a specific capacity of 757 C g⁻¹ at 1 A g⁻¹ and retains 369 C g⁻¹ at very high specific current of 50 A g⁻¹, which are both much higher than the corresponding bimetal and nomometal hydroxides. Therefore, both high electrochemical activity and rate capability have been achieved. The α phase NiCoMn−OH also exhibits a long-term cycling stability because the specific role of Co, maintaining 100% of the specific capacity after 1200 cycles. The hybrid supercapacitor based on NiCoMn−OH also shows high specific capacity of 219 C g⁻¹ at 1 A g⁻¹, high rate performance of 53% capacity retention when the specific current increases 25 times and ultralong cycling stability of 83% capacity retention after 12,000 cycles.

混合超级电容器迫切需要具有高电化学活性，良好的倍率性能和出色的循环稳定性的电活性材料，但是同时实现这些性能仍然是一个巨大的挑战。此处，合成了具有花状结构的α相镍钴锰氢氧化物（NiCoMn-OH）并将其用作混合超级电容器的电池材料。NiCoMn-OH在过渡金属之间表现出很强的协同电化学作用，有助于更好的电荷存储性能。所述的NiMn-OH表示的757 C g还比容量^-1 1个A G ^-1并保持369 C g还^-1在50甲克非常高的比电流^-1，两者均比相应的双金属和正金属氢氧化物高得多。因此，实现了高电化学活性和速率能力。α相NiCoMn-OH还表现出长期的循环稳定性，因为Co的特定作用在1200次循环后仍保持100％的比容量。基于NiCoMn-OH的混合超级电容器在1 A g ^-1时还显示出219 C g ^-1的高比容量，当比电流增加25倍时具有53％的容量保持率，以及83％的容量保持超长循环稳定性的高倍率性能。 12,000个周期后。