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Preparation method of growing needle-shaped network-structure nickel cobalt flexible electrode by taking carbon fiber as support body

A network structure, flexible electrode technology, applied in hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, hybrid capacitor current collectors, etc. Achieve good cycle stability, simple operation, and improve the effect of electrochemical performance

Inactive Publication Date: 2019-03-08
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the above method, multiple treatments are required to obtain activated carbon fibers. The treatment process is cumbersome, the cost is high, and the nickel cobaltate is loaded on the surface of the carbon fiber, and the reaction is easy to fall off; the cost of the composite material is high and it is difficult to popularize and apply.

Method used

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  • Preparation method of growing needle-shaped network-structure nickel cobalt flexible electrode by taking carbon fiber as support body
  • Preparation method of growing needle-shaped network-structure nickel cobalt flexible electrode by taking carbon fiber as support body
  • Preparation method of growing needle-shaped network-structure nickel cobalt flexible electrode by taking carbon fiber as support body

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: Add 0.8g of PAN to 10mL of DMF, stir magnetically at 60°C for 14h, stir until the solution turns bright yellow

[0031] Step 2: Set the electrospinning voltage to 15kV, the receiver speed to 800r / min, and the syringe advance speed to 5mm / h for electrospinning to obtain a white film-like carbon fiber precursor.

[0032] Step 3: Pre-oxidize the obtained white film at 250° C. for 2 hours in an air atmosphere, and the film turns from white to light brown; then carbonize it at 800° C. for 1 hour in an argon atmosphere to obtain a flexible substrate of carbon nanofibers.

[0033] Step 4: Prepare a mixed solution of nickel nitrate with a concentration of 0.07mol / L, cobalt nitrate with a concentration of 0.14mol / L and urea with a concentration of 0.21mol / L, and fully stir until dissolved.

[0034] Step 5: Immerse the prepared flexible carbon nanofiber substrate in the prepared solvent, and heat it under water at 180° C. for 6 hours to obtain a flexible carbon fiber film...

Embodiment 2

[0037] Step 1: Add 0.9g of PAN to 10mL of DMF, stir magnetically at 80°C for 12h, and stir until the solution turns bright yellow

[0038] Step 2: Set the electrospinning voltage to 16kV, the receiver speed to 500r / min, and the syringe advance speed to 5mm / h for electrospinning to obtain a white film-like carbon fiber precursor.

[0039] Step 3: Pre-oxidize the obtained white film at 220°C for 3 hours in an air atmosphere, and the film turns from white to light brown; then carbonize it at 700°C for 1 hour in an argon atmosphere to obtain a flexible substrate of carbon nanofibers.

[0040] Step 4: Prepare a mixed solution of nickel chloride with a concentration of 0.08mol / L, cobalt chloride with a concentration of 0.16mol / L and urea with a concentration of 0.24mol / L, and stir until dissolved

[0041] Step 5: Immerse the prepared flexible carbon nanofiber substrate in the prepared solvent, and heat it under water at 160° C. for 8 hours to obtain a flexible carbon fiber film-shap...

Embodiment 3

[0044] Step 1: Add 1.0g of PAN to 10mL of DMF, stir magnetically at 60°C for 24h, stir until the solution turns bright yellow

[0045] Step 2: Set the electrospinning voltage to 17kV, the receiver speed to 800r / min, and the syringe advance speed to 6mm / h for electrospinning to obtain a white film-like carbon fiber precursor.

[0046] Step 3: Pre-oxidize the obtained white film at 230° C. for 2 hours in an air atmosphere, and the film turns from white to light brown; then carbonize it at 800° C. for 1 hour in an argon atmosphere to obtain a flexible substrate of carbon nanofibers.

[0047] Step 4: Prepare a mixed solution of nickel sulfate with a concentration of 0.09mol / L, cobalt sulfate with a concentration of 0.18mol / L and urea with a concentration of 0.27mol / L, and fully stir until dissolved.

[0048] Step 5: Immerse the prepared flexible carbon nanofiber substrate in the prepared solvent, and heat it under water at 140° C. for 12 hours to obtain a flexible carbon fiber fil...

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Abstract

A preparation method of growing a needle-shaped network-structure nickel cobalt flexible electrode by taking carbon fiber as a support body comprises the steps of preparing a carbon fiber precursor from a PAN solution by an electrospinning method, performing pre-oxidization processing, and performing low-temperature carbonization to obtain a flexible carbon fiber; immersing the flexile carbon fiber in a mixed solution of a nickel salt and a cobalt salt, performing hydrothermal reaction by taking urea as a precipitant, and performing calcination. The preparation method is simple to operate andis low in cost, the prepared carbon fiber substrate is good in flexibility, the space among the fibers is larger, residual surface treatment is not needed due to an oxygen-containing functional group,the needle-shaped nickel cobalt is grown to form a unique network structure and is uniformly distributed in a flexible carbon fiber framework structure, the flexible electrode material is combined with favorable cycle stability of the carbon material and high energy density and specific capacity of the nickel cobalt, the electrochemical performance of the electrode is integrally improved, and theservice lifetime also can be remarkably prolonged.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite material preparation, and relates to a method for preparing a nickel cobaltate flexible electrode with a needle-like network structure grown on carbon fiber as a support. Background technique [0002] The development of clean and pollution-free energy is an inevitable trend of modern development. As a high-power-density energy storage device, supercapacitors have always attracted much attention. Among them, NiCo 2 o 4 As a double metal oxide, not only has Co 3 o 4 The high rate performance of NiO and the high specific capacitance of NiO make it a common supercapacitor material. However, nickel cobaltate is often used as an electrode material by coating. During the reaction process of the electrode prepared by this method, the active material is easy to fall off, which affects the service life of the material. In order to solve this problem, some scholars have grown nickel cobaltate on th...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/24H01G11/46H01G11/68
CPCH01G11/24H01G11/46H01G11/68H01G11/86Y02E60/13
Inventor 李翠艳畅丽媛欧阳海波隋泽卉黄剑锋曹丽云高茹
Owner SHAANXI UNIV OF SCI & TECH
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