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Preparation of lignin nano-carbon fibers for supercapacitor

A technology of supercapacitor and nano carbon fiber, which is applied in the direction of hybrid capacitor electrodes, etc., to achieve the effect of good flexibility, wide source and low price

Inactive Publication Date: 2018-04-24
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems in the preparation of lignin nano-carbon continuous fibers used in capacitor electrodes, to provide a method for preparing lignin-based carbon fibers that can be used in capacitors using electrospinning technology, and to solve the key problem of lignin-based spinning Key technologies such as stock solution preparation and fiber heat treatment

Method used

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  • Preparation of lignin nano-carbon fibers for supercapacitor
  • Preparation of lignin nano-carbon fibers for supercapacitor
  • Preparation of lignin nano-carbon fibers for supercapacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Take by weighing nitrogen, nitrogen-dimethylformamide (DMF) 8g as solvent, take by weighing alkali lignin 1.6g, take by weighing polyvinylpyrrolidone (PVP) 0.4g, wherein the ratio of polyvinylpyrrolidone (PVP) to alkali lignin It is 1:4. Dissolve alkali lignin in nitrogen, nitrogen-dimethylformamide (DMF), stir for 30 minutes, then add polyvinylpyrrolidone (PVP), and continue stirring for 4 hours to obtain a spinning dope with a uniform mass fraction of 20%. Electrospinning was carried out, and the spinning parameters were as follows: the flow rate of the spinning solution was 0.5ml / h, the applied voltage was 10kV, and the receiving distance was 15cm. Transfer the obtained as-spun fiber film into a tube furnace, raise the temperature to 150°C at a heating rate of 0.2°C / min and keep it for 20 hours in an air atmosphere, then raise the temperature to 360°C at a heating rate of 3°C / min and hold it for 5 hours Carry out pre-oxidation treatment; then raise the temperature t...

Embodiment 2

[0022] Take by weighing nitrogen, nitrogen-dimethylformamide (DMF) 8.5g as solvent, take by weighing alkali lignin 1g, take by weighing polyethylene oxide (PEO) 0.5g, wherein polyethylene oxide (PEO) and alkali The ratio of lignin is 1:2. Dissolve alkali lignin in DMF, stir for 30 min, add polyethylene oxide (PEO), and continue stirring for 4 h to obtain a spinning dope with a uniform mass fraction of 15%. Electrospinning was carried out, and the spinning parameters were as follows: the flow rate of the spinning solution was 2ml / h, the applied voltage was 15kV, and the receiving distance was 20cm. Transfer the obtained as-spun fiber film into a tube furnace, raise the temperature to 160°C at a heating rate of 0.8°C / min and keep it for 24 hours in an air atmosphere, then raise the temperature to 320°C at a heating rate of 1.5°C / min and hold it for 4 hours Carry out pre-oxidation treatment; then raise the temperature to 800°C at a heating rate of 3°C / min under a nitrogen atmosp...

Embodiment 3

[0024] Weigh 7.5 g of distilled water as a solvent, weigh 1.25 g of lignosulfonate, and weigh 1.25 g of polyvinylpyrrolidone (PVP), wherein the ratio of polyvinylpyrrolidone (PVP) to lignosulfonate is 1:1. Dissolve lignosulfonate in distilled water, stir for 30 minutes, add polyvinylpyrrolidone (PVP), and continue stirring for 4 hours to obtain a spinning dope with a uniform mass fraction of 25%. Electrospinning was carried out, and the spinning parameters were as follows: the flow rate of the spinning solution was 1 ml / h, the applied voltage was 20 kV, and the receiving distance was 25 cm. Transfer the obtained as-spun fiber film into a tube furnace, raise the temperature to 180°C at a heating rate of 1.2°C / min and keep it for 30 hours in an air atmosphere, then raise the temperature to 350°C at a heating rate of 0.2°C / min and keep it for 6 hours Carry out pre-oxidation treatment; then raise the temperature to 800°C at a heating rate of 3°C / min under a nitrogen atmosphere, an...

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Abstract

The invention discloses a preparation method of lignin nano-carbon fibers for a supercapacitor. Lignin which is extensive in sources, regenerative, high in carbon content and low in price is used as acarbon source, and a polymer which has high molecular weight is used as a spin finish aid. Nano initially spun fibers are prepared by an electrospinning technology, and are subjected to processes ofpre-oxidation, carbonization and the like to obtain nano-carbon fibers. The obtained carbon fibers can form a film directly, and the film can be directly tailored into an electrode of a capacitor. Themethod has the advantages of simplicity in process, high maneuverability, extensive sources, low price and the like. The obtained nano-carbon fibers are continuous fibers, the fiber morphology is good, and the capacitance characteristics are good.

Description

Technical field: [0001] The invention relates to a preparation method of lignin nano-carbon fibers for supercapacitors, belonging to the technical field of energy storage materials. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, are a new type of energy storage device between traditional capacitors and batteries. Compared with traditional capacitors, it has a higher specific capacitance, so it can store more energy, has higher power than batteries, can achieve fast charge and discharge, and has a higher cycle life, which can be carried out Many times of charge and discharge, but the energy density of supercapacitors is much lower than that of lithium-ion batteries. [0003] Electrode materials are a core component of supercapacitor research. Due to the advantages of wide sources, low cost, simple preparation method, non-toxicity, high specific surface area, high electrical conductivity, good chemical stability and wide temperature ...

Claims

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Application Information

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IPC IPC(8): D01F9/17H01G11/36H01G11/44H01G11/24
Inventor 马昌李正一曹二闯李晓杰王冉冉史景利
Owner TIANJIN POLYTECHNIC UNIV
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