材料科学
功率密度
电容器
储能
电解质
超级电容器
柔性电子器件
光电子学
电极
纳米技术
电压
电化学
电气工程
功率(物理)
化学
量子力学
物理
工程类
物理化学
作者
Xinshi Zhang,Zengxia Pei,Chaojun Wang,Zhangfu Yuan,Wei Li,Yuqi Pan,Asif Mahmood,Qian Shao,Yuan Chen
出处
期刊:Small
[Wiley]
日期:2019-10-14
卷期号:15 (47): 1903817-1903817
被引量:124
标识
DOI:10.1002/smll.201903817
摘要
Emerging wearable electronics require flexible energy storage devices with high volumetric energy and power densities. Fiber-shaped capacitors (FCs) offer high power densities and excellent flexibility but low energy densities. Zn-ion capacitors have high energy density and other advantages, such as low cost, nontoxicity, reversible Faradaic reaction, and broad operating voltage windows. However, Zn-ion capacitors have not been applied in wearable electronics due to the use of liquid electrolytes. Here, the first quasisolid-state Zn-ion hybrid FC (ZnFC) based on three rationally designed components is demonstrated. First, hydrothermally assembled high surface area and conductive reduced graphene oxide/carbon nanotube composite fibers serve as capacitor-type positive electrodes. Second, graphite fibers coated with a uniform Zn layer work as battery-type negative electrodes. Third, a new neutral ZnSO4-filled polyacrylic acid hydrogel act as the quasisolid-state electrolyte, which offers high ionic conductivity and excellent stretchability. The assembled ZnFC delivers a high energy density of 48.5 mWh cm−3 at a power density of 179.9 mW cm−3. Further, Zn dendrite formation that commonly happens under high current density is efficiently suppressed on the fiber electrode, leading to superior cycling stability. Multiple ZnFCs are integrated as flexible energy storage units to power wearable devices under different deformation conditions.
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