Flexible quasi-solid-state dual-ion asymmetric supercapacitor based on Ni(OH)2 and Nb2O5 nanosheet arrays

• 作者: Caiyun Wang Hongxia Wang Jianmin Ma Jinping Liu Minglei Mao Ramyakrishna Pothu Xiaolan Deng Yuqi Jiang Zengxi Wei
• 来源期刊: 绿色能源与环境:英文版
• 学科: 工学
• 关键词: Nickel HYDROXIDE Niobium pentoxide NANOARRAYS FLEXIBLE supercapacitor DUAL ION capacitor
• 年，卷（期）: 2019,（4）
• 页码范围: 382-390
• 页数: 9页
• 分类号: TN3

摘要

Increasing the energy density, power density as well as widening the operation voltage are essential to electrochemical capacitors to meet the practical energy demands. Herein, a novel flexible quasi-solid-state dual-ion asymmetric supercapacitor(ASC) with Ni(OH)2 and Nb2O5 nanosheets directly grown on stainless steel mesh is developed. In the dual-ion ASC, Nb2O5 negative and Ni(OH)2 positive electrodes react with Li+ and OH- respectively in alkaline gel electrolyte to store energy, which is quite different from conventional alkali metal ion SCs and alkaline SCs. The as-assembled flexible device has an extended working voltage of 1.7 V and delivers a capacity of 5.37 mAh cm-2, a maximum energy density and power density of 0.52 mWh cm-3 and 170 mW cm-3 , respectively. The device maintains around 60% capacity retention after long cycling up to 1000 cycles. Moreover, our device can light up a LED light efficiently upon fast charging. The proposed quasi-solid-state dual-ion ASC has potential applications in future portable electronics and flexible energy storage devices.