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Method for preparing sulfur/carbon@metal oxide nanotube lithium-sulfur battery positive electrode material by using atomic layer deposition technology

A technology of atomic layer deposition and positive electrode materials, which is applied in metal material coating technology, battery electrodes, lithium batteries, etc., to achieve the effects of reducing loss, uniform coating layer, and reducing active material loss

Active Publication Date: 2020-01-10
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of poor conductivity of elemental sulfur and serious loss of charge and discharge capacity in existing lithium-sulfur batteries, the present invention provides a method for preparing sulfur / carbon@metal oxide nanotube lithium-sulfur battery positive electrode materials by using atomic layer deposition technology. The material can effectively solve the problems of the loss of active sulfur and the shuttle effect of the positive electrode material of lithium-sulfur batteries, improve the cycle stability of the battery, and the preparation method involved is simple and effective

Method used

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  • Method for preparing sulfur/carbon@metal oxide nanotube lithium-sulfur battery positive electrode material by using atomic layer deposition technology
  • Method for preparing sulfur/carbon@metal oxide nanotube lithium-sulfur battery positive electrode material by using atomic layer deposition technology
  • Method for preparing sulfur/carbon@metal oxide nanotube lithium-sulfur battery positive electrode material by using atomic layer deposition technology

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 1) Mix 1.5g of polyacrylonitrile with a molecular weight of 150,000 and 0.6g of magnesium acetate with 11g of N,N-dimethylformamide solution and stir at room temperature for 10 hours to prepare a precursor polymer solution, and then pour the solution into a disposable syringe In the process, spinning under high pressure 13.5kV, low pressure -2.5kV, and rotation speed 200rpm for 8h to obtain a membrane;

[0026] 2) pre-oxidizing the film obtained in step 1) in air at 230°C for 3 hours, and then treating it in a nitrogen atmosphere at 900°C for 3 hours to obtain nanofibers;

[0027] 3) Under the environment of 1800Pa and 100℃, with diethylzinc and H 2 O is a reactant, with the nanofibers obtained in step 2) as the substrate, through 200 circles of ALD cycles, the growth thickness is a ZnO cladding layer of 40nm, to obtain nanofibers wrapped by zinc oxide;

[0028] 4) Mix the zinc oxide-wrapped nanofibers obtained in step 3) with sulfur in a weight ratio of 3:7, and keep ...

Embodiment 2

[0030] 1) Mix 1.5g of polyacrylonitrile with a molecular weight of 150,000 and 0.6g of magnesium acetate with 11g of N,N-dimethylformamide solution and stir at room temperature for 10 hours to prepare a precursor polymer solution, and then pour the solution into a disposable syringe In the process, spinning under high pressure 13.5kV, low pressure -2.5kV, and rotation speed 200rpm for 8h to obtain a membrane;

[0031] 2) pre-oxidizing the film obtained in step 1) in air at 230°C for 3 hours, and then treating it in a nitrogen atmosphere at 900°C for 3 hours to obtain nanofibers;

[0032] 3) Under the environment of 1800Pa and 100℃, with diethylzinc and H 2 O is a reactant, with the nanofibers obtained in step 2) as the substrate, through 250 circles of ALD cycles, the growth thickness is a ZnO cladding layer of 50nm, to obtain nanofibers wrapped by zinc oxide;

[0033] 4) Mix the zinc oxide-wrapped nanofibers obtained in step 3) with sulfur in a weight ratio of 3:7, and keep ...

Embodiment 3

[0035] 1) Mix 1.5g of polyacrylonitrile with a molecular weight of 150,000 and 0.6g of magnesium acetate with 11g of N,N-dimethylformamide solution and stir at room temperature for 10 hours to prepare a precursor polymer solution, and then pour the solution into a disposable syringe In the process, spinning under high pressure 13.5kV, low pressure -2.5kV, and rotation speed 200rpm for 8h to obtain a membrane;

[0036] 2) pre-oxidizing the film obtained in step 1) in air at 230°C for 3 hours, and then treating it in a nitrogen atmosphere at 900°C for 3 hours to obtain nanofibers;

[0037] 3) Under the environment of 1800Pa and 100℃, with diethylzinc and H 2 O is a reactant, with the nanofibers obtained in step 2) as the substrate, through 300 circles of ALD cycles, the growth thickness is a ZnO cladding layer of 60nm, to obtain nanofibers wrapped by zinc oxide;

[0038]4) Mix the zinc oxide-wrapped nanofibers obtained in step 3) with sulfur in a weight ratio of 3:7, and keep s...

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Abstract

The invention provides a method for preparing a sulfur / carbon@metal oxide nanotube lithium-sulfur battery positive electrode material by using an atomic layer deposition technology. The method is characterized by comprising the steps of adding magnesium acetate into a polyacrylonitrile spinning solution, carrying out electrostatic spinning to obtain a polyacrylonitrile film containing magnesium oxide, obtaining carbon fibers doped with magnesium oxide through carbonization, depositing zinc oxide on the surfaces of the fibers through atomic layer deposition to obtain a carbon / magnesium oxide@zinc oxide composite material, and obtaining the carbon / magnesium oxide@zinc oxide sulfur-loaded material through hot melting sulfur loading, and applying the material to a lithium-sulfur battery positive electrode material. According to the invention, the atomic layer deposition method is utilized in the process of preparing the lithium-sulfur battery positive electrode material, thereby being conducive to controlling the thickness and the uniformity of a wrapping layer, and achieving one-step doping of the positive electrode material. The preparation method provided by the invention of the composite material is simple in process, and the lithium-sulfur battery positive electrode material with good cycling stability and high specific capacity is obtained.

Description

technical field [0001] The invention relates to a method for preparing battery materials, in particular to a method for preparing anode materials for sulfur / carbon@metal oxide nanotube lithium-sulfur batteries by atomic layer deposition technology, and belongs to the field of lithium-sulfur battery preparation. Background technique [0002] In recent years, as lithium-ion batteries have gradually been unable to meet the demand for high energy density of energy storage devices. Elemental sulfur is abundant, cheap, environmentally friendly, and has high theoretical energy density (2600Wh kg-1) and theoretical specific capacity (1675mAh g-1), which has become a research hotspot today. [0003] At present, the commercialization of lithium-sulfur batteries needs to overcome the following disadvantages: first, elemental sulfur has poor conductivity (5×10-30Scm-1, 25°C), which is not conducive to electron transport; second, elemental sulfur is used as the cathode material of lithiu...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/62H01M10/052C23C16/40C23C16/455
CPCC23C16/407C23C16/45525H01M4/362H01M4/38H01M4/485H01M4/625H01M10/052H01M2004/028Y02E60/10
Inventor 蔡玉荣马丹阳蔡泽玮张茜王广舒
Owner ZHEJIANG SCI-TECH UNIV
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