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A functional interlayer of lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery, functional technology, applied in the field of material chemistry, can solve the problems of undesignable molecular structure and unadjustable chemical function, etc., achieve effective and stable temperature control, improve cycle stability, and obvious structure

Active Publication Date: 2022-06-03
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

Generally speaking, the molecular structure of inorganic materials and inorganic-organic hybrid porous materials, such as activated carbon and molecular sieves, cannot be designed and their chemical functions cannot be adjusted.

Method used

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  • A functional interlayer of lithium-sulfur battery and preparation method thereof
  • A functional interlayer of lithium-sulfur battery and preparation method thereof
  • A functional interlayer of lithium-sulfur battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of polyurea porous material:

[0028] Take 40 mL of acetone and 40 mL of deionized water, mix them evenly, add 15 mL of toluene diisocyanate dropwise to it under stirring, and the drop rate is 0.2 mL / s. After completion, centrifuge, wash, and dry to obtain a powdered polyurea porous material.

[0029] (2) Carbonized polyurea porous material:

[0030] The polyurea porous material prepared in step (1) was placed in a tube furnace, heated to 600 °C at a rate of 3 °C / min in an argon atmosphere, kept for 2 hours, and then cooled with the furnace still in an argon atmosphere, The carbonized polyurea porous material powder was obtained.

[0031] (3) Preparation of functional separator:

[0032] The carbonized polyurea porous material prepared in the step (2), the conductive agent super p, and the binder polyvinylidene fluoride are proportioned in a mass ratio of 8:1:1, and ground with a mortar for 2 hours to uniformly disperse, and then add The 1-methyl-2-p...

Embodiment 2

[0036] (1) Preparation of polyurea porous material:

[0037] Take 50 mL of acetone and 50 mL of deionized water, mix them evenly, add 20 mL of toluene diisocyanate dropwise to it under stirring, and the drop rate is 0.3 mL / s. After completion, centrifuge, wash, and dry to obtain a powdered polyurea porous material.

[0038] (2) Carbonized polyurea porous material:

[0039] The polyurea porous material prepared in step (1) was placed in a tube furnace, heated to 500 °C at a rate of 1 °C / min in an argon atmosphere, kept for 1 h, and then cooled with the furnace still in an argon atmosphere, The carbonized polyurea porous material powder was obtained.

[0040] (3) Preparation of functional separator:

[0041]The carbonized polyurea porous material prepared in the step (2), the conductive agent super p and the binder polyvinylidene fluoride are proportioned in a mass ratio of 8:1:1, and ground for 2 hours with a mortar to uniform dispersion, and then added. The 1-methyl-2-pyrr...

Embodiment 3

[0043] (1) Preparation of polyurea porous material:

[0044] Take 30 mL of acetone and 30 mL of deionized water, mix them evenly, and add 10 mL of toluene diisocyanate dropwise to it under stirring conditions. After completion, centrifuge, wash, and dry to obtain a powdered polyurea porous material.

[0045] (2) Carbonized polyurea porous material:

[0046] The polyurea porous material prepared in step (1) was placed in a tube furnace, heated to 800 °C at a rate of 5 °C / min in an argon atmosphere, kept for 3 hours, and then cooled with the furnace still in an argon atmosphere, The carbonized polyurea porous material powder was obtained.

[0047] (3) Preparation of functional separator:

[0048] The carbonized polyurea porous material prepared in the step (2), the conductive agent super p and the binder polyvinylidene fluoride are mixed in a mass ratio of 8: 1: 1, and the mortar is used for grinding for 1 hour until the dispersion is uniform, and then added. 1-Methyl-2-pyrr...

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Abstract

The technical solution of the invention relates to a functional interlayer of a lithium-sulfur battery and a preparation method thereof, belonging to the field of material chemistry. In the invention, firstly, polyurea porous material is prepared by using toluene diisocyanate as a raw material, and then carbonized and loaded on the surface of a 2400 diaphragm to obtain a functional diaphragm. The polyurea porous material prepared in this method is carbonized to obtain a carbon material with a porous structure, and at the same time realizes the nitrogen doping of the carbon material skeleton, the porous structure can physically adsorb lithium polysulfide, and nitrogen doping can carry out lithium polysulfide. Chemical adsorption, the synergistic effect of the two, can effectively adsorb lithium polysulfide produced during the charging and discharging process of lithium-sulfur batteries, reduce the loss of positive active materials, and improve the cycle stability of the battery.

Description

technical field [0001] The technical scheme of the present invention relates to a functional separator for lithium-sulfur batteries and a preparation method thereof, in particular to a method for carbonizing a polyurea porous material to prepare a functional separator, which belongs to the field of material chemistry. Background technique [0002] In recent years, with the increasingly prominent energy and environmental problems, the rapid development of electric vehicles, smart grids, and energy storage technologies, people have put forward higher requirements for energy conversion equipment. At present, the existing commercial energy conversion devices are mainly lithium-ion batteries, but the traditional lithium-ion batteries with transition metal oxides as cathode materials can no longer fully meet the demand for high energy density of electrical appliances. Therefore, it is crucial to develop battery systems with high energy density and high safety. Sulfur is one of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/446H01M50/449H01M50/403H01M10/052
CPCH01M10/052H01M50/409H01M50/431H01M50/403Y02E60/10
Inventor 张永光王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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