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High-sulfur-content polymers for positive electrode of lithium-sulfur battery and preparation method of high-sulfur-content polymers

A lithium-sulfur battery and polymer technology, applied in the field of synthesis of high-sulfur polymers, can solve the problems of low battery capacity, affecting battery reversibility and safety, etc., achieve high sulfur content, inhibit dissolution, and avoid volume expansion Effect

Active Publication Date: 2017-02-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitations of the current technical level, lithium-sulfur batteries still face some difficulties on the road to commercial use, such as elemental sulfur itself is not conductive, and the sulfur content in the sulfur cathode material prepared by doping is low, resulting in low battery capacity; The intermediate lithium polysulfide in the electrochemical reaction will be dissolved in the electrolyte; the volume expansion (up to 80%) of the positive electrode material during the reaction will seriously affect the reversibility and safety of the battery as a whole

Method used

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  • High-sulfur-content polymers for positive electrode of lithium-sulfur battery and preparation method of high-sulfur-content polymers
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  • High-sulfur-content polymers for positive electrode of lithium-sulfur battery and preparation method of high-sulfur-content polymers

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Effect test

preparation example Construction

[0042] Preparation of Thiophene Diene Monomer

[0043] single thiophene cyclodiene monomer

Embodiment 1-1

[0045] Under argon protection, weigh 0.600g of 3,4-dibromothiophene and 0.0663g of Ni(dppp)Cl 2 Add it to 15 ml of tetrahydrofuran solvent deoxygenated and dehydrated, and stir at room temperature until a homogeneous solution is formed. Then, under the protection of argon, extract 10ml of a solution of isopropene magnesium bromide (0.5M), and add it dropwise to 3,4-dibromothiophene and Ni(dppp)Cl under stirring conditions. 2 in the mixed solution. After heating to reflux at 65° C. for 24 h under an argon atmosphere, the reaction solution was cooled to room temperature, filtered with suction, and the crude product was purified by petroleum ether flash column to obtain 3,4-diisopropenylthiophene (DIT) monomer. The reaction formula is as follows:

[0046]

Embodiment 1-2

[0048] Under argon protection, weigh 0.600g of 3,4-dibromothiophene and 0.1029g of Ni(dppp)Cl 2 Add it to 15ml of diethyl ether solvent deoxygenated and dehydrated, and stir at room temperature until a homogeneous solution is formed. Then, under the protection of argon, extract 11ml of a solution of isobutylene magnesium bromide (0.5M), and add it dropwise to 3,4-dibromothiophene and Ni(dppp)Cl under stirring conditions. 2 in the mixed solution. After heating to reflux at 75° C. for 48 h under an argon atmosphere, the reaction liquid was cooled to room temperature, filtered with suction, and the crude product was purified by petroleum ether flash column to obtain 3,4-diisobutenylthiophene monomer. The reaction formula is as follows:

[0049]

[0050] Dithienyl diene monomer

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Abstract

The invention relates to high-sulfur-content polymers for a positive electrode of a lithium-sulfur battery and a preparation method of the high-sulfur-content polymers. The preparation method comprises the following steps: adding elemental sulfur into a narrow-neck bottle or a beaker filled with a magnetic stirring bar; then heating the narrow-neck bottle or the beaker in a constant temperature oil-bathing pot until a clear orange melting phase is formed; adding thiophene diene monomers into melt sulfur; stirring an obtained mixture at the temperature of 185 to 205DEG C; after a reaction mixture is cooled to room temperature, moving out the magnetic stirring bar, and directly scrapping a product from the bottle. According to the polymers obtained by the method provided by the invention, active sulfur and organic molecules are connected by chemical bonds in a molecular structure; when the polymers are used for a positive electrode material of the lithium-sulfur battery, the dissolving of polysulfide in electrolyte is effectively inhibited, and the problem like greater volume expansion in an electrochemical reaction process of the elemental sulfur is avoided; meanwhile, when a conjugated structure connected by a plurality of thiophene rings is used as the positive electrode material, the transmission of electrons is facilitated, and a new material is provided for the positive electrode material of the lithium-sulfur battery.

Description

technical field [0001] The invention relates to the synthesis of high-sulfur polymers, belongs to the technical fields of organic synthesis technology and lithium-sulfur battery preparation, and specifically relates to a class of high-sulfur-content polymers for positive electrodes of lithium-sulfur batteries and a preparation method. Background technique [0002] Lithium-sulfur (Li-S) batteries are considered to be the best choice for next-generation energy storage systems due to their high theoretical energy density and natural abundance of sulfur. A traditional lithium-sulfur battery consists of a lithium metal anode, an elemental sulfur cathode, and an ether-based electrolyte. High-capacity lithium electrode (3840mAh·g -1 ) and sulfur electrode (1675mAh·g -1 ) phase coupling can produce an average battery voltage of 2.2V and up to 2567W·h·kg -1 theoretical energy density. However, due to the limitations of the current technical level, lithium-sulfur batteries still f...

Claims

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Application Information

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IPC IPC(8): C08G75/02H01M4/60H01M10/052
CPCC08G75/02H01M4/602H01M10/0525Y02E60/10
Inventor 封伟赵付来冯弈钰李瑀
Owner TIANJIN UNIV
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