基于编织结构的高能量密度纤维状超级电容器

Fiber supercapacitors with high energy density based on braiding structure

同轴结构纤维状超级电容器因具有良好的整体性和优异的电化学性能而受到广泛关注,但其复杂的制备流程、精确的技术要求和较低的成品率限制了自身的发展。以AC@CNT(AC为活性炭,CNT为碳纳米管)负极为芯纱,NiCo_(2)S_(4)@CNT正极为编织纱,通过编织的方法制备出具有1.6 V工作电压的同轴结构纤维状非对称超级电容器。这种制备方法不但操作便捷、高效,而且制得的纤维状超级电容器具有较高的能量密度(在233.2 mW/cm^(3)的功率密度下,能量密度为35.1 mW·h/cm^(3))且柔软性良好(弯折1000次,循环伏安曲线无明显变化)。编织得到的纤维状超级电容器具有优异的可集成性,2根纤维状超级电容器串联后输出电压可达3.2 V,能够点亮65只LED组成的“DHU 70”图案。该研究可为设计新型同轴结构纤维状超级电容器提供一种全新的策略。

Coaxial structure fiber supercapacitor has received extensive attention due to its good integrity and excellent electrochemical performance.However,the complicated preparation process,precise technical requirements and low yield restricted its development.A coaxial structure fiber supercapacitor with an operating voltage of 1.6 V was prepared by braiding a core yarn of AC@CNT(AC is activated carbon and CNT is carbon nanotubes)negtive electrode and a braided yarn of NiCo_(2)S_(4)@CNT positive electrode.This braiding strategy is simple and efficient,and the fabricated fiber supercapacitor has a high energy density(energy density of 35.1 mW·h/cm^(3) at power density of 233.2 mW/cm^(3))and outstanding flexibility(no obvious change after bending 1000 cycles in cyclic voltammetry curve).The braided fiber supercapacitors show excellent integrability.The output voltage of 2-unit tandem fiber supercapacitors reaches 3.2 V,which can light up the"DHU 70"pattern composed of 65 LEDs.This work provides a new strategy for the preparation of coaxial structure fiber supercapacitors.