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Vinylene carbonate modified binder and lithium ion battery containing same

A vinylene carbonate and binder technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low mechanical stability and low electrical conductivity of the membrane, and achieve the effect of low cost and safe use.

Pending Publication Date: 2020-06-05
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most used binders are polyvinylidene fluoride (PVDF), styrene-butadiene copolymer (SBR), and acrylic (ester) binders, but there are still low electrical conductivity, film The disadvantage of low mechanical stability

Method used

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  • Vinylene carbonate modified binder and lithium ion battery containing same
  • Vinylene carbonate modified binder and lithium ion battery containing same
  • Vinylene carbonate modified binder and lithium ion battery containing same

Examples

Experimental program
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preparation example Construction

[0050] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0051] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0052] The peel force involved in the following examples is tested by the following method:

[0053] Coat the negative electrode slurry on the surface of the current collector (such as copper foil), dry and cold press to form a pole piece, cut the ...

Embodiment 1

[0058] Add 30 parts (mass parts, same below) of styrene, 70 parts of butadiene, 0.5 parts of acrylic acid, 2 parts of vinylene carbonate, 200 parts of water, 5 parts of sodium stearate, 0.5 parts of molecular weight adjustment Agent dodecyl mercaptan, nitrogen protection, stirring 300rpm, heating up to 60 ° C. After continuing to stir for 20 minutes, add 0.31 parts of potassium persulfate, keep warm at 60°C, condense, continue to stir at 300rpm, and react for 6h. Vinylene ester modified styrene-butadiene rubber emulsion binder, the average particle size of the emulsion binder is 158nm, PDI is 0.02, viscosity is 10-60mPa·s, solid content is 39-41wt%, pH=6.5 ~8.

[0059] Disperse the positive electrode active material lithium cobaltate, binder PVDF and conductive carbon black in N-methylpyrrolidone, and obtain a uniformly dispersed positive electrode slurry after stirring, wherein the solid content includes 96.8wt% lithium cobaltate, 1.3wt% PVDF and 2wt% conductive carbon blac...

Embodiment 2

[0063] Add 32 parts of styrene, 68 parts of butadiene, 3 parts of vinylene carbonate, 150 parts of water, 6 parts of sodium stearate, 0.6 part of molecular weight modifier dodecyl mercaptan in the reaction kettle, and pass into nitrogen protection, Stir at 300 rpm and heat up to 60°C. After continuing to stir for 20 minutes, add 0.3 parts of potassium persulfate, keep warm at 60°C, condense, continue to stir at 300rpm, and react for 6h. Vinyl ester modified styrene-butadiene rubber emulsion binder, the average particle size of the emulsion binder is 165nm, PDI is 0.018, viscosity is 15-50mPa·s, solid content is 38-40wt%, pH=7- 8.

[0064] The process flow of the method for making the lithium-ion battery is basically the same as in Example 1, except that the binder used is the modified styrene-butadiene rubber emulsion binder synthesized in this example.

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Abstract

The invention provides a vinylene carbonate modified binder and a lithium ion battery containing the vinylene carbonate modified binder. The vinylene carbonate modified binder comprises a matrix repeating unit A and a repeating unit represented by the following formula (1). According to the invention, an important film-forming aid vinylene carbonate in the electrolyte is introduced into the binder, the novel functionally modified bonding agent is prepared, when vinylene carbonate is introduced into a high-molecular chain of the existing binder, the adhesive property of the existing binder canbe improved, meanwhile, the modified binder is applied to an electrode plate, the lithium ion conduction capacity of the electrode plate is enhanced, the stability of the binder is also enhanced and the stripping force of the electrode plate is enhanced, and after the binder is applied to a lithium ion battery, the electrochemical impedance is reduced, the cycle performance of the battery is enhanced, and the low-temperature performance is better.

Description

technical field [0001] The invention relates to a binder modified by vinylene carbonate and a lithium ion battery containing the binder, which belongs to the technical field of lithium ion batteries, and specifically belongs to the development field of lithium ion battery binders. Background technique [0002] As a polymer, the binder in lithium-ion batteries not only plays a role in the bonding between the active material layers, but also is used for the bonding between the active material layer and the pole sheet substrate. In terms of battery manufacturing and performance It plays an important role and is one of the important components of the battery. At present, the most used binders are polyvinylidene fluoride (PVDF), styrene-butadiene copolymer (SBR), and acrylic (ester) binders, but there are still low electrical conductivity, film The disadvantage of low mechanical stability. Contents of the invention [0003] In order to improve the deficiencies in the prior ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/10C08F212/08C08F220/06C08F218/00C08F220/18C08F220/20C08F220/56C08F220/48H01M4/62H01M10/0525
CPCC08F236/10C08F220/56C08F220/18C08F220/20H01M4/622H01M10/0525C08F212/08C08F220/06C08F218/00C08F220/14C08F220/48Y02E60/10
Inventor 储霖李素丽陈伟平王海李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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