A preparation method of composite fiber, flexible electrode and supercapacitor based on manganese dioxide/ink carbon@activated carbon fiber

Abstract

The invention discloses a manganese dioxide / ink carbon@ activated carbon fiber-based composite fiber, a flexible electrode, a supercapacitor and a preparation method of the composite fiber. The composite fiber is porous composite fiber with a core-shell structure; an inner core is dominated by activated carbon fiber; and a shell is dominated by a composite material of manganese dioxide and ink carbon nanoparticles. The activated carbon fiber has good adsorptivity; ink carbon nanoparticles can coat the surface of the activated carbon fiber through simple soaking and drying, and the manganese dioxide is chemically deposited, so that the conductivity of the composite fiber is improved through an ink carbon coating layer, the utilization rate of the manganese dioxide is also greatly improved and great improvement of the performance of the flexible electrode and the supercapacitor is achieved. The manganese dioxide / ink carbon@ activated carbon fiber-based composite fiber has the advantagesof being simple in preparation method, mild in process, suitable for mass production and low in cost, and has a good application prospect in the field of flexible bendable electronic products and wearable electronic equipment and devices.

Description

technical field [0001] The invention belongs to the technical field of flexible supercapacitors, in particular to a manganese dioxide / ink carbon@activated carbon fiber (MnO 2 / ink@ACFs) composite fibers, flexible electrodes, supercapacitors and preparation methods of composite fibers. Background technique [0002] Supercapacitor is an electrochemical capacitor with high power density, which has the characteristics of both traditional capacitors and batteries, so it has been extensively studied in the past two decades. At present, the electrode materials used in supercapacitors mainly include carbon materials, conductive polymers and metal oxides. Transition metal oxides are considered as the most promising electrode materials for next-generation supercapacitors due to their multiple valence states, among which manganese dioxide (MnO 2 ) has become the most widely used pseudocapacitive material due to its low cost, high theoretical capacity (1370F / g), abundant resources, an...

AI Technical Summary

Problems solved by technology

At present, the composition of fiber electrodes mainly includes flexible substrates and active materials, and flexible substrates mainly include metal wires, elastic polymer fibers and carbon-based fibers, among which metal wires (Ni, Ti, Au, Pt, etc.) have a high density. Greater rigidity and hardness are not conducive to the flexibility of the device; although polymer fibers (PDMS, PET, PMMA, etc.) have good flexibility and elasticity, their poor electrical conductivity greatly limits their applications and require complex processes (plating Metals, etc.) to improve its conductivity; in recent years, oriented carbon nanotube fibers and graphene fibers have gradually been used as substitutes for metal wires and elastic polymer fibers, but their tensile strength is low, low utilization rate and relatively complex However, the preparation process of carbon fibers (CFs) has been widely used in flexible supercapacitors; commercial carbon fibers (CFs) have attracted people's attention because of their low cost, high electrical conductivity, and excellent mechanical properties. However, due to their compact structure and small surface area, it is difficult to directly As an electrode material, it cannot meet the requirements of high specific capacitance and energy density. Even if it is combined with other active materials, the carbon fiber substrate still occupies a considerable part of the mass / volume ratio of the electrode, but it does not contribute to the electrochemical performance. This is almost all fiber Electrode short board

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