Hybrid supercapacitors with the composite electrode materials display high energy density at the expense of the reduced cycle stability. Herein, we provide new data on the electrochemical performance of hybrid electrodes based on mixed nickel hydroxides/manganese oxides in the form of structured and multiphase composites. As structured composites, two types of less known structure modifications are examined: interstratified modification of Ni(OH)₂ (i.e. α/β_IS-Ni(OH)₂) and ε-modification of MnO₂. The multiphase hydroxide/oxide composites are prepared by the conventional grinding of α/β_IS-Ni(OH)₂ and ε-MnO₂ and by the in-situ formation after the reaction of layered Na_0.5Ni_0.5Mn_0.5O₂ with mixed LiOH-KOH electrolyte. The structure, morphology and porous texture properties of composites are analyzed by means of powder X-ray diffraction, scanning electron microscopy (SEM) and low-temperature nitrogen adsorption, respectively. The electrochemical performance of composites electrodes is determined by galvanostatic experiments in concentrated individual KOH and mixed LiOH-KOH electrolytes. The ex-situ X-ray diffraction is used to monitor the changes in composite electrodes during electrochemical cell function. It has been found that α/β_IS-Ni(OH)₂ participates in electrochemical reaction concomitantly with H₂O and Li⁺ intercalation, while the electrochemical performance of ε-MnO₂ is determined by surface adsorption of electrolyte alkaline ions. The best electrochemical performance (in terms of discharge capacity, rate capability and cycling stability) is achieved for α/β_IS-Ni(OH)₂ especially when it works in mixed LiOH-KOH electrolyte. In alkaline electrolyte solution, layered Na_0.5Ni_0.5Mn_0.5O₂ is transformed into a phase mixture between slightly sodium deficient oxide Na_0.5-xNi_0.5Mn_0.5O₂ and α-type nickel hydroxide. Thus generated multiphase composite demonstrates the highest areal capacitance and a rate capability comparable with that for α/β_IS-Ni(OH)₂.

具有复合电极材料的混合超级电容器显示出高能量密度，但以降低的循环稳定性为代价。在这里，我们提供了基于混合的氢氧化镍/锰氧化物的结构化和多相复合材料形式的混合电极的电化学性能的新数据。结构化复合材料，两种类型的少已知结构的修改都检查：间层修饰的Ni（OH）₂（即α/β _IS -Ni（OH）₂）和MnO的ε-修改₂。多相氢氧化物/氧化物复合材料通过α/β的常规研磨制备_IS -Ni（OH）₂和ε-的MnO ₂和由原位层状Na _0.5 Ni _0.5 Mn _0.5 O ₂与混合的LiOH-KOH电解质反应后形成。分别通过粉末X射线衍射，扫描电子显微镜（SEM）和低温氮吸附对复合材料的结构，形貌和多孔织构特性进行了分析。复合电极的电化学性能是通过恒电流实验在浓缩的单个KOH和LiOH-KOH混合电解质中确定的。所述非原位X射线衍射被用于监测电化学电池功能期间在复合电极的变化。已经发现的是α/β _IS -Ni（OH）₂ε- MnO ₂的电化学性能由电解质碱性离子的表面吸附决定，并伴随H ₂ O和Li ^+的插入而参与电化学反应。最好电化学性能（放电容量，倍率性能和循环稳定性方面）可以实现α/β _IS -Ni（OH）₂特别是当它工作在混合的LiOH-KOH电解质。在碱性电解液中，层状的Na _0.5 Ni _0.5 Mn _0.5 O ₂转化为轻度钠缺乏氧化物Na _0.5-x Ni _0.5之间的相混合物Mn _0.5 O ₂和α型氢氧化镍。这样生成多相复合演示最高面积电容和速率能力与为α/β可比_IS -Ni（OH）₂。