Preparation method of cross-linked polyurethane binder and application of the cross-linked polyurethane binder in field of lithium batteries

A technology of polyurethane and binder, which is applied in the field of binder preparation, can solve problems such as easy agglomeration, poor adsorption of sulfide, uneven coating of pole pieces, etc., and achieves improved Coulombic efficiency, suppressed volume effect, and is environmentally friendly Effect

Active Publication Date: 2020-09-25
广州市乐基智能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has the problem of difficult dispersion of the polymer, which is easy to agglomerate during use, resulting in uneven coating of the pole piece
Patent CN109980227A discloses a composite binder for lithium-sulfur batteries and its preparation method. Polyvinylidene fluoride and polyurethane are dissolved in an organic solvent in a certain proportion as a binder for lithium-sulfur batteries. This method solves the problem to a certain extent. solved the problem of dispersion, but the ability to effectively adsorb sulfides is still limited
The above methods have improved the performance of the binder to a certain extent, but have failed to prepare a new polymer binder, and the adsorption of sulfide is poor

Method used

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  • Preparation method of cross-linked polyurethane binder and application of the cross-linked polyurethane binder in field of lithium batteries
  • Preparation method of cross-linked polyurethane binder and application of the cross-linked polyurethane binder in field of lithium batteries

Examples

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Embodiment 1

[0030] A preparation method of a cross-linked polyurethane binder, the specific steps are as follows:

[0031] 1. Dissolve 2,4-toluene diisocyanate and poly(ethylene glycol adipate) diol (PAD) with a molecular weight of 2000 and a hydroxyl value of 53 mgKOH / g in N-methylpyrrolidone at a molar ratio of 5:4, and Control the total solid content of the two at 10wt%; in a closed space and in a nitrogen-filled environment, stir at 120rpm for 0.5h at 25-30°C to mix the reactants evenly; after mixing, raise the temperature to 60°C and control The stirring rate was controlled at 80 rpm, and after 2 hours of reaction, a block polymer solution with cyanate groups at both ends was obtained.

[0032] 2. Add ethylenediamine to the polymer solution obtained in step 1, control the temperature of the reaction system at 60°C, and the stirring rate at 100rpm. After 1 hour of reaction, a polyurethane solution with a large molecular weight is obtained, in which aromatic diisocyanate and polyester ...

Embodiment 2

[0037] A preparation method of a cross-linked polyurethane binder, the specific steps are as follows:

[0038] 1. Dissolve 2,6-toluene diisocyanate and poly(ethylene glycol adipate) diol (PAD) with a molecular weight of 2000 and a hydroxyl value of 55 mgKOH / g in N-methylpyrrolidone at a molar ratio of 5:4.2, and Control the solid content at 10wt%, in a closed space, and in an environment filled with nitrogen, at 25-30°C, stir at 100rpm for 0.5h to mix the reactants evenly; after mixing, raise the temperature to 60°C, and control the stirring rate After reacting for 2 hours at 80 rpm, a block polymer solution with cyanate groups at both ends was obtained.

[0039] 2. Add hexamethylenediamine to the polymer solution obtained in step 1, control the temperature of the reaction system at 60°C, and the stirring rate at 100rpm. After 1 hour of reaction, a polyurethane solution with a large molecular weight is obtained, in which aromatic diisocyanate and polyester diisocyanate The fu...

Embodiment 3

[0043] A preparation method of a cross-linked polyurethane binder, the specific steps are as follows:

[0044] 1. Dissolve 2,4-toluene diisocyanate and polyethylene adipate diol (PEA) with a molecular weight of 2000 and a hydroxyl value of 61mgKOH / g in N-methylpyrrolidone at a molar ratio of 5:4.5, and Control the solid content at 10wt%, and in a closed space filled with nitrogen, stir at 100rpm for 0.5h at 25-30°C to mix the reactants evenly; after mixing, raise the temperature to 70°C and control the stirring rate After reacting for 2 hours at 80 rpm, a block polymer solution with cyanate groups at both ends was obtained.

[0045] 2. Add hexamethylenediamine to the polymer solution obtained in step 1, control the temperature of the reaction system at 70°C, and the stirring rate at 100rpm. After 1 hour of reaction, a polyurethane solution with a large molecular weight is obtained, in which aromatic diisocyanate and polyester diisocyanate The functional group molar ratio of a...

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Abstract

The invention discloses a preparation method of a cross-linked polyurethane adhesive, which comprises the following steps: 1, pre-polymerization of polyurethane: carrying out pre-reaction on aromaticdiisocyanate and polyester diol at a certain temperature by a solution polymerization method to generate a block polymer with cyanate groups at two ends; 2, chain extension: carrying out chain extension on the block polymer obtained in the step 1 through a primary ammonia chain extender to increase the molecular weight of the block polymer; and 3, cross-linking: carrying out a cross-linking reaction on the polymer obtained in the step 2 under a heating condition to obtain the cross-linked polyurethane. The prepared cross-linked polyurethane is used as a binder of a lithium-sulfur battery electrode material and contains a large number of positively charged secondary amino groups, and benzene ring rigid groups can effectively inhibit precipitation of negatively charged sulfide in a lithium-sulfur battery cathode and the volume effect of elemental sulfur, so that the coulombic efficiency and the cycle performance of the lithium-sulfur battery cathode are improved.

Description

technical field [0001] The invention belongs to the field of polymer materials and relates to a preparation method of a binder for lithium-sulfur batteries. Background technique [0002] At present, the development of high-efficiency lithium-ion batteries with higher energy density, greater power, and longer cycle life has become a hot spot in lithium battery research. As a lithium battery cathode material, sulfur element has a theoretical energy density of up to 1650mAh / g, which is very in line with people's requirements for high energy density lithium batteries. Therefore, lithium-sulfur batteries have broad development prospects. However, lithium-sulfur batteries have several challenges, which greatly hinder the development of lithium-sulfur batteries. For example, the shuttle effect of sulfide, the sulfide produced by simple sulfur during charge and discharge is easy to dissolve in the electrolyte, and pass through the separator and deposit on the negative electrode, w...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/66C08G18/42C08G18/10C08G18/32H01M4/62H01M10/052
CPCC08G18/7614C08G18/7678C08G18/4238C08G18/10H01M4/622H01M10/052C08G18/3228Y02E60/10
Inventor 蔡菁
Owner 广州市乐基智能科技有限公司
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