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Binder for lithium battery, preparation method of binder, electrode plate and lithium ion battery

A lithium-ion battery and binder technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low tensile strength, hindering lithium-ion performance, and poor mechanical properties, so as to improve lithium-ion conductivity , Improve overall battery performance, and suppress volume expansion

Inactive Publication Date: 2020-09-18
浙江中科玖源新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These binders generally or partially have defects such as the need to use a large amount of organic solvents, expensive, difficult to recycle, poor bonding performance, poor mechanical properties, low tensile strength, and weak ion-conducting ability, which hinder the further improvement of lithium ion performance.

Method used

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  • Binder for lithium battery, preparation method of binder, electrode plate and lithium ion battery
  • Binder for lithium battery, preparation method of binder, electrode plate and lithium ion battery
  • Binder for lithium battery, preparation method of binder, electrode plate and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of binder for lithium battery, its general structural formula is:

[0030] The preparation process comprises the following steps:

[0031] Pour 500g of acetone into a three-necked flask equipped with a stirrer, a thermometer, and a condensing water separator, and then add 75.664g of 3,3'-disulfonic acid-4,4'-difluorobenzophenone, and 22.242g of Hydroquinone, then add 75g xylene, heat and stir until the temperature reaches 80°C, add 21.624g Na 2 CO 3 , and then continue to heat up to 150 ° C to produce azeotropy, the upper layer in the water separator is xylene, and the lower layer of water, the lower layer of water is continuously released until all the water is released, then continue to reflux for 20 minutes, distill the xylene, and then continue to heat up to React at a constant temperature of 250°C for 2 hours until the reaction is complete; pour the reaction product into cold water to cool and solidify, then pulverize and filter, take the filter residue ...

Embodiment 2

[0033] A kind of binder for lithium battery, its general structural formula is:

[0034] Its preparation process comprises the following steps:

[0035] Excessive concentrated sulfuric acid and hydroquinone type polyaryletherketone (structural formula is ) into a three-neck flask equipped with a magnetic stirring device and a thermometer, heated and stirred slowly, and the reaction temperature was controlled at 50°C, and reacted until the solution changed from light yellow to yellowish brown, and finally dark red, and poured the reaction solution into ice water mixture, while continuously stirring, to obtain a white filamentous product, filtered, and then repeatedly washed the product to neutrality, put it in a vacuum drying oven and dry it at 100°C to obtain the bonding agent for lithium batteries. agent.

Embodiment 3

[0037] A kind of binder for lithium battery, its general structural formula is:

[0038] Its preparation process comprises the following steps:

[0039] Equipped with a magnetic stirring device, a thermometer, a water separator, a condenser and N 2 Add 2.13g sodium 2,5-dihydroxybenzenesulfonate, 2.18g 4,4'-difluorobenzophenone, 2.07g finely ground anhydrous potassium carbonate, 90mL dimethyl sulfoxide and 60mL Toluene, under the protection of nitrogen, heat and stir to 120°C for reflux reaction for 3 hours, then slowly raise the temperature to 180°C, distill the toluene, and continue the reaction for 6 hours. After the reaction is completed, the product is precipitated in ethanol and water, washed with water, extracted with acetone, and dried to obtain the Adhesives for lithium batteries.

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Abstract

The invention discloses a binder for a lithium battery. The structural general formula of the binder is shown as a formula 1. The invention further discloses the binder for the lithium battery, a preparation method of the binder, an electrode plate for the lithium battery and the lithium ion battery. According to the invention, the sulfonated polyaryletherketone polymer is used as a binder, so thevolume expansion of the silicon-carbon negative electrode material can be effectively inhibited; meanwhile, sulfonate radicals on aromatic rings have strong conductivity, and the conductivity of lithium ions is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a binder for lithium batteries, a preparation method, electrode sheets and lithium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used as an efficient, green and environmentally friendly new energy since they were developed in the 1990s, especially in electronic products and the automotive industry. As consumers have higher and higher expectations for products, lithium-ion batteries, which are an important part of products, are also developing in a greener, more energy-efficient, and lighter-weight direction. A general battery consists of three parts: positive electrode, negative electrode and electrolyte. There are electrode binders in both the positive and negative electrodes, which are important auxiliary materials in the battery. Although the proportion in the battery is small, it has a great impact on the performance of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/133H01M4/134H01M10/0525C08G65/40
CPCC08G65/4056C08G65/4068H01M4/133H01M4/134H01M4/622H01M4/628H01M10/0525Y02E60/10
Inventor 李南文许辉张群
Owner 浙江中科玖源新材料有限公司
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