Highly Stable Three-Dimensional Nickel-Cobalt Hydroxide Hierarchical Heterostructures Hybridized with Carbon Nanotubes for High-Performance Energy Storage Devices
Highly Stable Three-Dimensional Nickel-Cobalt Hydroxide Hierarchical Heterostructures Hybridized with Carbon Nanotubes for High-Performance Energy Storage Devices
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与碳纳米管杂化的高稳定三维氢氧化镍钴多级异质结构用于高性能储能器件
DOI：
10.1021/acsnano.9b04282
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发表时间：
2019
期刊：
影响因子：
17.1
通讯作者：
Chueh Yu Lun
中科院分区：
文献类型：
--
作者：
Wang Yan;Wei Hualiang;Lv Huifang;Chen Zexiang;Zhang Jijun;Yan Xinyu;Lee Ling;Wang Zhiming M;Chueh Yu Lun
使用一种简便的一步水热法设计了一种三维（3D）复合材料，该复合材料由在碳纳米管（CNT）材料上生长的镍钴（Ni-Co）双氢氧化物纳米针（NCDHN）组成，表示为CNTs@NCDHN。这种复合材料被进一步制成电极，具有高倍率性能和长循环寿命。对3D CNTs@NCDHNs电极和Ni-Co氢氧化物电极的电化学性能的比较分析表明，CNTs@NCDHNs的高倍率性能和长循环寿命是由于协同效应。 CNTs@NCDHNs在1 A g-1的电流密度下表现出1823 F g-1的高比电容，并且在20 A g-1的充放电速率下保留了超过77.6%的电容。为了评估 CNTs@NCDHNs 的功能行为，组装并测试了使用 CNTs@NCDHNs 作为正极、rGO-Fe2O3 作为负极的准固态电池。这些器件具有高达 20 A g-1 的超快充放电速率，具有高倍率能力和出色的长期循环稳定性。当施加0-1.6 V范围内的电压时，相应的准固态器件在功率密度为1.13 kW kg-1时表现出高达54.6 Wh kg-1的高能量密度，在12.4 kW kg-1时表现出高达35.8 Wh kg-1的能量密度。此外，该装置在不同的极端条件下都表现出最佳的灵活性、稳定性和安全性。
A three-dimensional (3D) composite consisting of nickel–cobalt (Ni–Co) dual hydroxide nanoneedles (NCDHNs) grown on a carbon nanotube (CNT) material, denoted as CNTs@NCDHNs, was designed using a facile one-step hydrothermal method. This composite was further fabricated into electrodes, which exhibited high rate capability and long cycle life. Comparative analysis of the electrochemical performance between 3D CNTs@NCDHNs electrodes and Ni–Co hydroxide electrodes revealed that the high rate capability and long cycle life of the CNTs@NCDHNs are due to a synergistic effect. The CNTs@NCDHNs exhibited a high specific capacitance of 1823 F g–1at a current density of 1 A g–1, and more than 77.6% of the capacitance was retained at a charge–discharge rate of 20 A g–1. To evaluate the functional behavior of the CNTs@NCDHNs, quasi-solid-state cells using CNTs@NCDHNs as the positive electrode and rGO–Fe2O3as the negative electrode were assembled and tested. These devices presented ultrafast charge–discharge rates of up to 20 A g–1with high rate capabilities and excellent long-term cyclic stability. The corresponding quasi-solid-state device presented a high energy density of up to 54.6 Wh kg–1at a power density of 1.13 kW kg–1and an energy density of 35.8 Wh kg–1at 12.4 kW kg–1when a voltage in the range 0–1.6 V was applied. Moreover, the device exhibited optimal flexibility, stability, and safety under different extreme conditions.