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Lithiated vulcanized polyacrylonitrile and preparation method thereof, positive electrode sheet and lithium-sulfur secondary battery

A technology for vulcanized polyacrylonitrile and lithium-sulfur secondary batteries, which is applied in the direction of secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., and can solve the problem of low active material loading, unfavorable high energy density lithium-sulfur secondary batteries, etc. question

Active Publication Date: 2021-08-20
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to form an effective force between the sulfurized polyacrylonitrile (SPAN) material and the binder commonly used in traditional lithium-ion batteries, resulting in a low loading of active materials in the positive electrode, which is not conducive to obtaining lithium-sulfur disulfide with high energy density. secondary battery

Method used

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  • Lithiated vulcanized polyacrylonitrile and preparation method thereof, positive electrode sheet and lithium-sulfur secondary battery
  • Lithiated vulcanized polyacrylonitrile and preparation method thereof, positive electrode sheet and lithium-sulfur secondary battery
  • Lithiated vulcanized polyacrylonitrile and preparation method thereof, positive electrode sheet and lithium-sulfur secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of sulfur active material S1#:

[0045] (1) Evenly mix elemental sulfur and polyacrylonitrile (molecular weight: 150,000) in a mortar at a mass ratio of 8:1, mix with an appropriate amount of ethanol, and ball mill for two hours. After the material is dried in a blast oven at 60°C, it is calcined at 300°C for 10 hours under the protection of nitrogen atmosphere, so that the main chain of the acrylonitrile polymer undergoes dehydrogenation reaction to form a matrix, and the elemental sulfur melts and polymerizes with the dehydrogenated acrylonitrile Sulfurized polyacrylonitrile material (SPAN) was obtained by compounding the material matrix, and the elemental analyzer (EA, Perkin Elmer PE2400II) was used to test that the mass content of sulfur (S) element was 45%, and the total mass content of nitrogen (N) element was 11%. X-ray photoelectron spectroscopy (XPS, AXIS ULTRA DLD) was used to analyze the change of the nitrogen content of the cyano group in the vu...

Embodiment 2

[0051] Preparation of sulfur active material S2#: the same process as described in Example 1.

[0052] Preparation of the positive electrode sheet P2#: the same as the positive electrode sheet preparation method described in Example 1, the difference is that the mass ratio of the binder PAA / P (HEA-co-DMA) and graphene in the conductive adhesive is replaced by 1:1 It is 1:3, and the positive plate is recorded as P2#.

[0053] Preparation of lithium-sulfur secondary battery C2#: the same process as described in Example 1.

Embodiment 3

[0055] Preparation of sulfur active material S3#: the same process as described in Example 1.

[0056] Preparation of the positive electrode sheet P3#: same as the method for preparing the positive electrode sheet described in Example 1, the difference is that the mass ratio of the binder PAA / P (HEA-co-DMA) to graphene in the conductive adhesive is replaced by 1:1 It is 3:1, and the positive plate is recorded as P2#.

[0057] Preparation of lithium-sulfur secondary battery C3#: the same process as described in Example 1.

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Abstract

The present application relates to the technical field of lithium-sulfur secondary batteries, and mainly relates to a lithiated sulfurized polyacrylonitrile used as a positive electrode active material for a lithium-sulfur secondary battery, and a positive electrode sheet including the active material and a lithium-sulfur secondary battery. The lithiated sulfurized polyacrylonitrile is prepared by lithiation of sulfurized polyacrylonitrile. In the present invention, by lithiation of vulcanized polyacrylonitrile, the vulcanized polyacrylonitrile active material itself generates hydrophilic carboxylate ions, and when compounded with a conductive binder, it is beneficial to form a hydrogen bond with a strong force inside the system. It is beneficial to increase the sulfur loading and capacity per unit area of ​​the positive electrode.

Description

technical field [0001] The present application relates to the technical field of lithium batteries, and mainly relates to a lithiated sulfurized polyacrylonitrile used as a positive electrode active material for a lithium-sulfur secondary battery, and a positive electrode sheet including the active material and a lithium-sulfur secondary battery. Background technique [0002] With the rapid development of modern electric vehicles, the energy density of traditional lithium-ion batteries can only reach 300Wh / kg, which has been difficult to meet the increasing demand for energy density in the field of power batteries. In many cutting-edge battery research and development fields, sulfur as a cathode material not only has a high theoretical specific capacity (1675mAh / g) and energy density (2600Wh / kg), but also has the advantages of low cost and environmental friendliness. Therefore, lithium-sulfur secondary batteries are gradually attracting the attention of scientific researcher...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/137H01M10/0525
CPCH01M4/13H01M4/137H01M10/0525Y02E60/10
Inventor 刘成勇许志新郭永胜杨军梁成都
Owner CONTEMPORARY AMPEREX TECH CO
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