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Size-controllable Ni-NiO heterojunction nanoparticle doped carbon fiber, preparation method and application in lithium-sulfur battery diaphragm

A nanoparticle and carbon nanofiber technology, applied in lithium batteries, non-aqueous electrolyte batteries, nanotechnology, etc., can solve problems such as low rate and capacity reduction, and achieve the effect of increasing initial capacity, improving comprehensive performance, and inhibiting the shuttle effect.

Pending Publication Date: 2022-04-01
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Another object of the present invention is to provide the application of size-controllable Ni-NiO heterojunction nanoparticle-doped carbon fiber in lithium-sulfur battery separator, and solve the problem of lithium-sulfur battery through the adjustment of Ni-NiO heterojunction to polysulfide reaction. Technical problems such as capacity drop and low rate caused by the "shuttle effect" of polysulfides

Method used

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  • Size-controllable Ni-NiO heterojunction nanoparticle doped carbon fiber, preparation method and application in lithium-sulfur battery diaphragm
  • Size-controllable Ni-NiO heterojunction nanoparticle doped carbon fiber, preparation method and application in lithium-sulfur battery diaphragm
  • Size-controllable Ni-NiO heterojunction nanoparticle doped carbon fiber, preparation method and application in lithium-sulfur battery diaphragm

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Effect test

Embodiment 1

[0055] A method for preparing size-controllable Ni-NiO heterojunction nanoparticles doped carbon nanofibers, comprising the following steps:

[0056] 1) Weigh 0.278g of dimethylglyoxime and dissolve it in 24mL of absolute ethanol, add 40mL of 0.5 mol / L sodium hydroxide solution, adjust the pH of the above solution to 13, and form A solution.

[0057] 2) Weigh 0.521g of nickel chloride hexahydrate and dissolve it in 700mL of deionized water to form B solution.

[0058] 3) Slowly add solution A to solution B, dropwise for 30 minutes, stir at a constant speed of 400 rpm for 30 minutes, let stand for 3 hours, centrifuge, wash with deionized water and absolute ethanol for 5 minutes times, until the pH of the supernatant was neutral, and dried at 60° C. for 10 h to obtain a precursor.

[0059] 4) Put the obtained precursor into a tube furnace and calcinate at 600°C for 1 hour under the protection of argon to obtain ultrafine Ni nanoparticles doped carbon nanofibers.

[0060] 5) Pu...

Embodiment 2

[0075] A method for preparing size-controllable Ni-NiO heterojunction nanoparticles doped carbon nanofibers, comprising the following steps:

[0076] 1) Weigh 0.278g of dimethylglyoxime and dissolve it in 24mL of absolute ethanol, add 40mL of potassium hydroxide solution with a concentration of 0.8 mol / L, adjust the pH of the above solution to 13, and form A solution.

[0077] 2) Weigh 0.521g of nickel chloride hexahydrate and dissolve it in 700mL of deionized water to form B solution.

[0078] 3) Slowly add solution A to solution B, dropwise for 30 minutes, stir at a constant speed for 30 minutes at a stirring speed of 400 rpm, let stand for 3 hours, centrifuge, wash with deionized water and absolute ethanol respectively 5 times, until the pH of the supernatant was neutral, and dried at 60° C. for 10 h to obtain a precursor.

[0079] 4) Put the obtained precursor into a tube furnace, and calcinate at 700° C. for 1 hour under the protection of argon to obtain ultrafine Ni nan...

Embodiment 3

[0089] A method for preparing size-controllable Ni-NiO heterojunction nanoparticles doped carbon nanofibers, comprising the following steps:

[0090] 1) Weigh 0.595g of dimethylglyoxime and dissolve it in 27mL of absolute ethanol, add 45mL of sodium hydroxide solution with a concentration of 0.6 mol / L, adjust the pH of the above solution to 13, and form A solution.

[0091] 2) Weigh 0.318g of nickel chloride hexahydrate and dissolve it in 800mL of deionized water to form B solution.

[0092] 3) Slowly add solution A to solution B dropwise for 30 minutes, stir at a constant speed of 500 rpm for 20 minutes, and let stand for 4 hours to obtain a precursor.

[0093] 4) The obtained precursor is put into a tube furnace, and calcined at 600° C. for 1 hour under the protection of argon to obtain carbon nanofibers doped with ultrafine Ni nanoparticles.

[0094] 5) Place the obtained product in air and calcinate at 300° C. for 2 hours to obtain carbon nanofibers modified with Ni—NiO h...

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Abstract

The invention provides a size-controllable Ni-NiO heterojunction nano-particle doped carbon fiber, a preparation method thereof and application of the size-controllable Ni-NiO heterojunction nano-particle doped carbon fiber in lithium-sulfur battery diaphragms.The size-controllable Ni-NiO heterojunction nano-particle doped carbon fiber and the preparation method thereof have the advantages that precipitates generated by complexation reaction of dimethylglyoxime and nickel ions are used as precursors for heat treatment; therefore, the Ni-NiO heterojunction nanoparticle doped carbon nanofiber composite material with controllable size can be formed in situ. Compared with the prior art, the preparation method provided by the invention is simple and easy to implement, high-energy-consumption technologies such as electrostatic spinning are not needed, the nanofiber precursor can be directly prepared through stirring and standing, and Ni-NiO heterojunction uniform particles with controllable sizes are generated in situ in the heat treatment process. The Ni-NiO heterojunction nanoparticle doped carbon nanofiber can play an important role in a lithium-sulfur battery, the prepared material is modified on the surface of a lithium-sulfur battery diaphragm, the initial capacity can be remarkably improved, the shuttle effect can be inhibited, and the comprehensive performance of the lithium-sulfur battery is improved.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a size-controllable Ni-NiO heterojunction nanoparticle doped carbon nanofiber, a preparation method, and an application in a lithium-sulfur battery diaphragm. Background technique [0002] As an efficient energy storage device, lithium-ion batteries have greatly promoted the development of human society and will continue to play an important role in the future. However, the traditional lithium-ion battery with lithium-rich transition metal oxide positive electrode and graphite negative electrode has been difficult to meet people's demand for high energy density and low manufacturing cost. Therefore, it is imminent to explore and develop new rechargeable battery systems. [0003] The theoretical energy density of lithium-sulfur batteries is 2600Wh / Kg, which is 7-8 times that of traditional lithium-ion batteries. The theoretical specific capacity of sulfur in the posit...

Claims

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Application Information

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IPC IPC(8): D01F9/12D01F1/10B82Y30/00B82Y40/00H01M10/052H01M50/431H01M50/44
CPCY02E60/10
Inventor 濮军王涛
Owner ANHUI NORMAL UNIV
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