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Negative electrode binder for lithium-ion battery, preparation method of negative electrode binder and lithium-ion battery containing negative electrode binder

A technology of lithium-ion batteries and binders, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor electrochemical stability and poor mechanical properties of binders, and achieve good mechanical properties and electrical Chemical stability, strong adhesive force, effect of small amount of addition

Pending Publication Date: 2020-12-29
宜昌虎柏新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the object of the present invention is to provide a negative electrode binder for lithium ion batteries to solve the problem of poor mechanical properties and poor electrochemical stability of the existing binder in the prior art. good question

Method used

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  • Negative electrode binder for lithium-ion battery, preparation method of negative electrode binder and lithium-ion battery containing negative electrode binder
  • Negative electrode binder for lithium-ion battery, preparation method of negative electrode binder and lithium-ion battery containing negative electrode binder

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Experimental program
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Effect test

Embodiment 1

[0031] The seed emulsion comprises the following components and parts by weight thereof:

[0032] Deionized water: 250 parts; Sodium alkyl sulfate: 1 part; Sodium alkyl sulfonate: 1 part; Sodium p-styrene sulfonate: 2 parts; Sodium persulfate: 0.4 parts; 4-F-styrene: 85 parts; Acrylonitrile: 5 parts; acrylic acid: 0.2 parts; n-dodecanethiol: 0.5 parts.

[0033] The preparation method of the seed emulsion is: after the polymerization tank is evacuated, add deionized water, sodium alkyl sulfate, sodium alkyl sulfonate, sodium p-styrene sulfonate, sodium persulfate, start stirring and heat up to 70 ° C, drop Add a mixture of 4-F-styrene, acrylonitrile, acrylic acid and n-dodecanethiol to carry out free radical emulsion polymerization. The reaction time is 3 hours. The temperature is raised to 90°C and kept for 0.5 hours. After cooling, the seed emulsion is obtained by filtering. .

[0034] Negative electrode binder for lithium ion battery comprises following components and part...

Embodiment 2

[0047] The seed emulsion comprises the following components and parts by weight thereof:

[0048] Deionized water: 289 parts; Sodium alkylsulfonate: 3 parts; Sodium alkylbenzenesulfonate: 2 parts; Sodium p-styrenesulfonate: 3 parts; Sodium acrylamidoisopropylsulfonate: 2 parts; Ammonium: 1 part; 4-Cl-styrene: 95 parts; n-butyl acrylate: 10 parts; isobutyl acrylate: 5 parts; maleic acid: 1 part;

[0049] The preparation method of the seed emulsion is: after the polymerization kettle is evacuated, add deionized water, sodium alkylsulfonate, sodium alkylbenzenesulfonate, sodium p-styrenesulfonate, sodium acrylamido isopropylsulfonate, persulfuric acid Ammonium, start stirring and heat up to 90°C, add dropwise the mixture of 4-Cl-styrene, n-butyl acrylate, isooctyl acrylate, maleic acid, and tert-dodecyl mercaptan to carry out free radical emulsion polymerization, and the reaction time is After 6 hours, the temperature was raised to 90° C. for 0.5 hour, and after cooling, the see...

Embodiment 3

[0060] The seed emulsion comprises the following components and parts by weight thereof:

[0061] Ionized water: 255.5 parts; Sodium alkylbenzene sulfonate: 2 parts; Sodium alkylphenol ether sulfosuccinate: 1.5 parts; Sodium alkyl sulfosuccinate allyl succinate: 2 parts; Sodium sulfonate: 1.5 parts; potassium persulfate: 0.7 parts; 4-Br-styrene: 90 parts; methyl acrylate: 10 parts; methacrylic acid: 0.6 parts;

[0062] The preparation method of the seed emulsion is: after the polymerization tank is evacuated, add deionized water, sodium alkylbenzene sulfonate, sodium alkylphenol ether sulfosuccinate, sodium alkyl allyl succinate sulfonate, alkyl acrylic acid -2-Sodium ethanesulfonate, potassium persulfate, start stirring and heat up to 80°C, dropwise add the mixture of 4-Br-styrene, methyl acrylate, methacrylic acid, n-butyl mercaptan to carry out free radical emulsion polymerization, The reaction time is 4.5 hours, the temperature is raised to 90° C. for 0.5 hours, and the s...

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Abstract

The invention discloses a negative electrode binder for a lithium-ion battery, the negative electrode binder comprises the following components in parts by weight: 100 parts of halogenated styrene, 80-110 parts of 1,3-butadiene, 170-220 parts of deionized water, 0.4-1.5 parts of an emulsifier 1, 0.4-1.5 parts of an emulsifier 2, 0.8-3 parts of an initiator 1, 20-30 parts of a seed emulsion, 1-9 parts of a carboxylic acid monomer 1, 0.5-2 parts of a molecular weight regulator 1 and 0.1-2.7 parts of an alkaline substance. Compared with the prior art, a halogenated styrene-butadiene rubber emulsion binder for the negative electrode of the lithium-ion battery is prepared by polymerizing the halogenated styrene and the 1,3-butadiene to form a main body and matching the main body with other components, the polarity of a high polymer is improved and the cohesiveness is enhanced due to the existence of halogen atoms on a benzene ring; and thus, the binder has favorable mechanical properties and electrochemical stability.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a negative electrode binder for lithium ion batteries, a preparation method thereof and a lithium ion battery containing the negative electrode binder. Background technique [0002] As a new energy product in the 21st century, lithium-ion batteries are widely used because of their high energy density, high discharge platform, long service life, no memory effect, wide operating temperature range, high safety performance, and environmental protection. It is applied to electric tools, smartphones, tablet computers, electric vehicles and other fields, especially in the field of new energy electric vehicles. [0003] Lithium-ion batteries are made by assembling the positive electrode of the battery, the negative electrode of the battery, and the separator, injecting the electrolyte and activating it. When making a lithium-ion battery pole piece, a binder is need...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525C08F212/14C08F236/10C08F220/06C08F222/02
CPCH01M4/622H01M4/623H01M10/0525C08F212/20C08F212/18C08F212/21C08F212/16C08F236/10C08F220/06C08F222/02Y02E60/10
Inventor 李文
Owner 宜昌虎柏新能源有限公司
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