High and low temperature flexible fibrous supercapacitor and preparation method and application thereof

Abstract

The invention provides a preparation method of a high and low temperature flexible fibrous supercapacitor, two conductive polymer composite fiber electrodes are parallelly arranged at a certain interval, two ends are fixed on a PET film by use of a conductive adhesive tape and conductive silver adhesive, surfaces are coated with aqueous gel electrolytes, and thus a high and low temperature flexible fibrous supercapacitor integrated device is prepared. The invention also provides a high and low temperature flexible fibrous supercapacitor and application thereof. The high and low temperature flexible fibrous supercapacitor still maintains high energy density in a wide-temperature range environment from 60 to 100 DEG C, and has ultrahigh safety performance, and the performance is not affectedwhen the supercapacitor is bent at an arbitrary angle.

Description

technical field [0001] The invention relates to a capacitor, in particular to a preparation method of a water system high and low temperature capacitor and its application in extreme environments. Background technique [0002] Wearable electronics and e-textiles are rapidly developing and have promising application prospects in portable electronic devices. Fibrous supercapacitors have the characteristics of small size, high flexibility, and easy design into various structures, so they are recognized as the most potential energy storage electronic materials. Compared with traditional two-dimensional supercapacitors and batteries, the lower specific energy of one-dimensional fibrous supercapacitors limits its applications. Although there has been great progress in improving the energy density of fiber-shaped capacitors, such as designing high specific capacitance, high conductivity carbon materials, embedding some pseudocapacitive metal oxides, by assembling into asymmetric c...

AI Technical Summary

Problems solved by technology

However, there are still great challenges in extreme environments, including low energy density, large capacity fading, expensive electrolytes (ionic liquids), and leakage safety issues of liquid electrolytes.

[0003] Most of the currently researched fibrous supercapacitors are based on highly toxic and flammable organic electrolytes (acetonitrile, which has high volatility and low ignition point) or high-viscosity expensive ionic liquid electrolytes or concentrated acids (H 2 SO 4 ,H 3 PO 4 ) and alkaline (NaOH) solvents which have great safety hazards

In particular, flexible wearable electronic devices are directly pasted on people's skin. In practical applications, such electronic devices will inevitably be bent or twisted. Once leakage occurs, these potential safety problems will be more serious.

However, so far, most of the current research on fiber-shaped capacitors is still at room temperature, especially in the severe winter (below -20°C) to the hot equatorial region (above 40°C). Can't work and can't meet people's needs

The performance of capacitors will deteriorate in extreme environments, such as capacitance decay, increased internal resistance, increased cycle life, and explosion due to increased internal heat, which will severely limit its practical applications

[0004] To the best of our knowledge, high-energy-density fibrous wearable flexible aqueous capacitors in extreme environments from below −30 °C to above 50 °C have not been reported so far.

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