A kind of cross-linked SBR microsphere binder and preparation method and lithium ion battery containing the binder

A lithium-ion battery and binder technology, applied in battery electrodes, secondary batteries, battery components, etc., can solve the problem of difficult control of material stability, incomplete polymerization modification, and incomplete and effective combination of carbon black, etc. problems, to achieve good application prospects, good adhesion effect

Active Publication Date: 2021-03-30
ZHUHAI COSMX BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese invention patent application with the application number CN201810283260.2 discloses a carbon black modified water-based SBR lithium-ion battery binder and its preparation method. Using styrene and butadiene as raw materials, the SBR is prepared by in-situ emulsion polymerization. Conductive carbon black is bonded to the molecular chain to obtain carbon black modified water-based SBR, but in this method, carbon black cannot be completely and effectively combined, and the stability of the material is difficult to control
The Chinese invention patent application with the application number CN 201711144903.7 discloses a preparation method of a modified styrene-butadiene rubber-type negative electrode binder. The styrene-butadiene rubber and acrylic acid are mixed and stirred, then irradiated, and the irradiated product is mixed with sodium hydroxide Stir and wash to obtain modified styrene-butadiene rubber. This method adopts acrylic acid-modified styrene-butadiene rubber with good affinity with the electrolyte, but in the process, there will be incomplete polymerization and modification by irradiation, which will affect the overall lithium battery. Ion battery performance improvements are limited

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  • A kind of cross-linked SBR microsphere binder and preparation method and lithium ion battery containing the binder
  • A kind of cross-linked SBR microsphere binder and preparation method and lithium ion battery containing the binder
  • A kind of cross-linked SBR microsphere binder and preparation method and lithium ion battery containing the binder

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Experimental program
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specific Embodiment approach 1

[0029] A cross-linked SBR microsphere binder, the cross-linked SBR microsphere has a porous cross-linked structure.

[0030] Further, the particle size range of the cross-linked SBR microspheres is 10nm-1um, preferably, the particle size range of the cross-linked SBR microspheres is 50nm-250nm.

[0031] Further, the porosity of the cross-linked SBR microspheres ranges from 0.01% to 40%.

[0032] Further, the pore diameter range of the pore is greater than 0 and less than or equal to 200nm, the pore includes micropores, mesopores and macropores, the pore diameter of the micropores is <2nm, the diameter of the mesopores is 2nm~50nm, and the diameter of the macropores is 50nm~200nm .

[0033] A preparation method of cross-linked SBR microsphere binder, comprising the steps of:

[0034] Step 1: Spray butadiene and styrene with sodium hydroxide aqueous solution with a mass fraction of 8%~16% at 20~40°C for 10min~4h, and then wash with deionized water until neutral to obtain deion...

Embodiment 1

[0050] A preparation method of cross-linked SBR microsphere binder, comprising the following steps:

[0051] Step 1: Spray butadiene and styrene with 8% sodium hydroxide aqueous solution at 20°C for 4 hours, and then wash with deionized water until neutral to obtain butadiene from which the polymerization inhibitor has been removed. olefin and deinhibited styrene;

[0052] Step 2: In parts by mass, 200 parts of deionized water, 25 parts of styrene, 80 parts of n-heptane, 20 parts of n-propanol, 20 parts of methyl alcohol, 40 parts of glycerol, 40 parts of Xylene, 75 parts of butadiene that removes the polymerization inhibitor are added to the reactor and stirred until uniformly mixed; add 0.16 parts of dodecyl mercaptan, 4.62 parts of disproportionated abietic acid soap, 0.15 parts of methylene bis-naphthalene Sodium sulfonate, 0.025 parts of sodium dithionite dihydrate, 0.24 parts of potassium phosphate, stir continuously until the mixture is uniform, and keep the temperatur...

Embodiment 2

[0058] A preparation method of cross-linked SBR microsphere binder, comprising the following steps:

[0059] Step 1: raw material pretreatment: including the purification of monomers and the configuration of initiators and other added components; butadiene and styrene were sprayed with 10% sodium hydroxide aqueous solution at 40°C for 10 minutes, Then deionized water is washed to neutrality to obtain the butadiene that removes the polymerization inhibitor and the styrene that removes the polymerization inhibitor; the butadiene that removes the polymerization inhibitor, porogen, modified monomer, and The combination of styrene, molecular weight regulator, deoxidizer, electrolyte, reducing agent, complexing agent, oxidizing agent, emulsifier and co-emulsifier, terminator and co-termination agent are respectively configured with deionized water to remove the polymerization inhibitor. Aqueous solution or emulsion, the concentration is not required; wherein, the porogen includes n-...

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Abstract

The invention provides a cross-linked SBR microsphere binder and a preparation method and a lithium-ion battery containing the binder, and the lithium-ion battery containing the binder is compared with a lithium-ion battery containing a conventional SBR binder. It has the advantages of better rate performance, low temperature performance, fast charging performance and long cycle performance. The invention belongs to the technical field of lithium ion batteries, and the specific technical scheme is: a cross-linked SBR microsphere binder, the cross-linked SBR microsphere has a porous cross-linked structure, and the particle diameter of the porous cross-linked SBR microsphere is The range is 10nm~1um, the porosity range is 0.01%~40%, and the pore diameter range is greater than 0 and less than or equal to 200nm.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a crosslinked SBR microsphere binder, a preparation method thereof and a lithium ion battery containing the binder. Background technique [0002] Lithium-ion batteries have the characteristics of long cycle life, no memory effect, high energy density and low environmental pollution. In recent years, they have been widely used in the field of digital and power vehicles. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, and electrolytes. Both the positive and negative electrodes contain binders. The material, conductive agent and current collector are tightly bonded together, so that the electrode sheet has good processability, and more importantly, it ensures that the fabricated battery cell can maintain its electrochemical performance for a long time. [0003] Conventional lithium-ion battery binders main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525C08F236/10C08F212/08
CPCY02E60/10C08F212/08C08J2309/06C08J2201/026C08J2205/042C08J9/286C08J2201/0544H01M4/622H01M50/491H01M50/489H01M50/443H01M50/414H01M4/13C08F236/06C08F236/10C08F2/30C08F4/34C08J9/20H01M10/0525
Inventor 唐伟超李素丽赵伟袁号李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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