Compressed Nanolamella‐Stacked Ni(OH)2/NiCo2O4 Composite as Electrode for Battery‐Type Supercapacitor,Batteries & Supercaps

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Compressed Nanolamella‐Stacked Ni(OH)2/NiCo2O4 Composite as Electrode for Battery‐Type Supercapacitor
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2019-12-23 , DOI: 10.1002/batt.201900190
Chunli Guo ₁ , Huaiyan Wang ₁ , Xiaochuan Ren ₂ , Weike Zhang ₃ , Lifeng Hou ₁ , Yinghui Wei _{1,

4} , Zhongchao Bai ₁

Affiliation

Transition metal oxides/hydroxides as electrode materials for supercapacitors have drawn great attention in the past decades. However, the large volume expansion during the cycling always leads to capacity decrease and short cycle life. In this paper, a compressed Ni(OH)₂/NiCo₂O₄ nanolamellas composite grown on nickel foam is synthesized by a one‐step hydrothermal method towards the enhanced performance of supercapacitors. The resulting Ni(OH)₂/NiCo₂O₄ composite displays unexpectedly excellent cycle stability both in single‐electrode cycling (112 % after 90,000 cycles at 5 mA cm⁻²) and hybrid supercapacitor cycling (124 % after 80,000 cycles at 1 A g⁻¹). The excellent electrochemical performances are attributed to the unique compressed nanolamella‐stacked architecture, which can not only accommodate the volume expansion, but also increase the contact area between the electrode and electrolyte.

中文翻译：

压缩纳米薄片堆叠的Ni（OH）2 / NiCo2O4复合材料作为电池型超级电容器的电极

在过去的几十年中，过渡金属氧化物/氢氧化物作为超级电容器的电极材料备受关注。但是，循环过程中的大体积膨胀总是导致容量降低和循环寿命短。本文通过一步水热法合成了在泡沫镍上生长的压缩Ni（OH）₂ / NiCo ₂ O ₄纳米片复合材料，以提高超级电容器的性能。所得的Ni（OH）₂ / NiCo ₂ O ₄复合材料在单电极循环（在5 mA cm ^-2的90,000次循环后为112％）和混合超级电容器循环（在1 A的80,000次循环后为124％）中均显示出乎意料的出色循环稳定性。 G^-1）。出色的电化学性能归因于独特的压缩纳米薄片堆叠结构，该结构不仅可以适应体积膨胀，而且可以增加电极与电解质之间的接触面积。

更新日期：2019-12-23

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