A preparation method of a positive electrode functional separator applied in a lithium sulfur battery

A lithium-sulfur battery, functional technology, applied in the field of preparation of positive electrode functional interlayer, can solve the problems of poor performance of lithium-sulfur batteries, low utilization of active materials, etc., to achieve rich mesopores and micropores, reaction reversibility The effect of improving and increasing the utilization rate

Inactive Publication Date: 2018-12-11
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method of the positive electrode functional spacer that is applied in the lithium-sulfur battery, this method adopts polyacrylonitrile (PAN) and silicon dioxide (SiO 2 ) as a precursor, the electrospinning process is used to prepare continuous nanofiber membranes, and the electrospun PAN membranes are carbonized, hydrofluoric acid treated, and activated to obtain positive electrode functional interlayers, which can improve current The polysulfide shuttle effect in the lithium-sulfur battery that exists in the technology, the active material utilization rate in the positive electrode material is low, resulting in the defect of poor performance of the lithium-sulfur battery

Method used

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  • A preparation method of a positive electrode functional separator applied in a lithium sulfur battery
  • A preparation method of a positive electrode functional separator applied in a lithium sulfur battery
  • A preparation method of a positive electrode functional separator applied in a lithium sulfur battery

Examples

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Embodiment 1

[0026] (1) Preparation of silica-polyacrylonitrile

[0027] Using N,N-dimethylformamide (DMF) as a solvent for PAN polymer and silica, the SiO 2 Stir and dissolve into the PAN / DMF solution to obtain the electrospinning precursor solution, wherein DMF:PAN:SiO 2 Weigh according to the mass ratio of 8:1:1. Inhale the precursor solution into the syringe, and perform electrospinning with the following parameters: adjust the distance between the needle tip and the receiving cylinder to a set distance of 25cm, apply a voltage of 18kV, inject the pump at a rate of 0.3ml / h, and collect the rotating speed at 500 rpm;

[0028] (2) Pretreatment of silica-polyacrylonitrile

[0029] The silica-polyacrylonitrile obtained in step (1) was stabilized in air at 260 °C for 4 h, and the heating rate was 1 °C / min;

[0030] (3) Carbonization treatment of silica-polyacrylonitrile

[0031] The pretreated silica-polyacrylonitrile film was carbonized under a nitrogen atmosphere at a heating rate of ...

Embodiment 2

[0039] (1) Preparation of silica-polyacrylonitrile

[0040] Using N,N-dimethylformamide (DMF) as a solvent for PAN polymer and silica, the SiO 2 Stir and dissolve into the PAN / DMF solution to obtain the electrospinning precursor solution, wherein DMF:PAN:SiO 2 Weigh according to the mass ratio of 8:1:0.5. Inhale the precursor solution into the syringe, and perform electrospinning with the following parameters: adjust the distance between the needle tip and the receiving cylinder to a set distance of 25cm, apply a voltage of 18kV, inject the pump at a rate of 0.3ml / h, and collect the rotating speed at 500 rpm;

[0041] (2) Pretreatment of silica-polyacrylonitrile

[0042] Stabilize the silica-polyacrylonitrile obtained in step (1) at 280 °C in air for 3 h, and the heating rate is 1 °C / min;

[0043] (3) Carbonization treatment of silica-polyacrylonitrile

[0044] The pretreated silica-polyacrylonitrile film was carbonized under a nitrogen atmosphere at a heating rate of 5 °C...

Embodiment 3

[0050] Step 1: Preparation of silica-polyacrylonitrile membrane by electrospinning

[0051] (1) Preparation of silica-polyacrylonitrile

[0052] Using N,N-dimethylformamide (DMF) as a solvent for PAN polymer and silica, the SiO 2 Stir and dissolve into the PAN / DMF solution to obtain the electrospinning precursor solution, wherein DMF:PAN:SiO 2 Weigh according to the mass ratio of 8:1:0.25. Inhale the precursor solution into the syringe, and perform electrospinning with the following parameters: adjust the distance between the needle tip and the receiving cylinder to a set distance of 25cm, apply a voltage of 18kV, inject the pump at a rate of 0.3ml / h, and collect the rotating speed at 500 rpm;

[0053] (2) Pretreatment of silica-polyacrylonitrile

[0054] The silica-polyacrylonitrile obtained in step (1) was stabilized in air at 260 °C for 4 h, and the heating rate was 1 °C / min;

[0055] (3) Carbonization treatment of silica-polyacrylonitrile

[0056] The pretreated silic...

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Abstract

The invention belongs to the field of material chemistry and relates to a preparation method of a positive electrode functional separator applied to a lithium sulfur battery. The method uses polyacrylonitrile and silica as precursors, and an electrostatic spinning process for preparing continuous nanofiber membranes. The electrostatic spinning PAN film is carbonized, and subjected to hydrofluoricacid treatment and activation to obtain a positive electrode functional barrier layer, which can make up a defect of poor performance of the lithium sulfur battery due to low utilization rate of active material in the positive electrode material caused by the polysulfide shuttle effect in the lithium sulfur battery in the prior art.

Description

technical field [0001] The invention belongs to the field of material chemistry, and relates to a method for preparing a battery interlayer, and more particularly, to a method for preparing a positive electrode functional interlayer applied to a lithium-sulfur battery. Background technique [0002] With the rapid development of science and technology and information industry, the development of new energy has become an urgent need. Lithium-ion batteries have the advantages of high specific energy, environmental friendliness and pollution-free, abundant resources, and low price. They have become the choice of energy storage devices such as mobile electronic products and electric vehicles, but they still cannot satisfy people's demand for new types of batteries that are environmentally friendly and high specific energy. growing demand. The theoretical capacity of the new lithium-sulfur battery can reach 1675mAh / g, and the theoretical energy density can reach 2600 Wh / kg. Lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16B82Y40/00
CPCB82Y40/00H01M50/403H01M50/431H01M50/44Y02E60/10
Inventor 张永光贺禹森王新
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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