Full-Temperature All-Solid-State Ti3C2Tx/Aramid Fiber Supercapacitor with Optimal Balance of Capacitive Performance and Flexibility,Advanced Functional Materials

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Full-Temperature All-Solid-State Ti3C2Tx/Aramid Fiber Supercapacitor with Optimal Balance of Capacitive Performance and Flexibility
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-03-24 , DOI: 10.1002/adfm.202010944
Qi Liu _{1,

2,

3} , Anran Zhao _{1,

2,

3} , Xuexia He _{1,

2,

3} , Qi Li _{1,

2,

3} , Jie Sun _{1,

2,

3} , Zhibin Lei _{1,

2,

3} , Zong‐Huai Liu _{1,

2,

3}

Affiliation

Full-temperature all-solid-state flexible symmetrical fiber supercapacitors (FSCs) are assembled by using montmorillonite flake/polyvinyl alcohol organic hydrogel (F-MMT/PVA OHGE) as the electrolyte and separator and Ti₃C₂T_x/ANF-5% (T/A-5) fiber as the electrode, in which T/A-5 fiber is prepared by using delaminated Ti₃C₂T_x nanosheets as assembled units and 5% of aramid nanofiber (ANF) as the functional additive using a wet spinning method in a coagulated bath with 0.5 m FeCl₂ solution. The T/A-5 hybrid fiber exhibits a specific capacity of 807 F cm⁻³ in 3 m H₂SO₄ electrolyte, a superior mechanical strength of 104 MPa, and a high conductivity of 1025 S cm⁻¹. The assembled F-MMT/PVA OHGE T/A-5 FSC not only shows a specific capacitance of 295 F cm⁻³ and a capacitance retention of 91% at a current density of 5 A cm⁻³ after 10 000 charging/discharging cycles, but also a maximum volumetric energy density of 26.2 mWh cm⁻³. Meanwhile, the assembled device displays good flexibility and excellent capacitance in a wide temperature range of −40 to 80 °C, the electrochemical performance of the FSC is maintained under varying degrees of bending. This study provides an effective strategy for designing and assembling of full-temperature all-solid-state symmetrical flexible FSCs with the optimal balance of capacitive performance and flexibility.

中文翻译：

具有电容性能和灵活性的最佳平衡的全温度全固态Ti3C2Tx /芳纶纤维超级电容器

以蒙脱土片/聚乙烯醇有机水凝胶（F-MMT / PVA OHGE）为电解质和隔板，并以Ti ₃ C ₂ T _x / ANF-5组装全温度全固态柔性对称纤维超级电容器（FSC）％（T / A-5）纤维作为电极，其中T / A-5纤维通过使用分层的Ti ₃ C ₂ T _x纳米片作为组装单元和5％的芳族聚酰胺纳米纤维（ANF）作为功能性添加剂来制备在凝固浴中用0.5 m FeCl ₂溶液进行湿法纺丝。T / A-5杂化纤维在3 m H _2中的比容量为807 F cm ^-3SO ₄电解质，优异的机械强度104 MPa和高电导率1025 S cm ^-1。组装的F-MMT / PVA OHGE T / A-5 FSC在经过1万次充电/放电循环后，在5 A cm ^-3的电流密度下不仅显示出295 F cm ^-3的比电容和91％的电容保持率，但最大体积能量密度为26.2 mWh cm ^-3。同时，组装后的器件在−40至80°C的宽温度范围内显示出良好的柔韧性和出色的电容，FSC的电化学性能在不同程度的弯曲下得以保持。这项研究为设计和组装全温度全固态对称柔性FSC提供了一种有效的策略，并在电容性能和柔性之间实现了最佳平衡。

更新日期：2021-05-26

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