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Lithium-ion secondary battery active material binder

A technology of active materials and secondary batteries, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as environmental pollution and affecting the health of operators, and achieve production safety, improve use safety, and active material capacity show high effect

Active Publication Date: 2021-02-26
汕头市鲁汕化工原料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: to provide a lithium-ion secondary battery active material adhesive, the production process is environmentally friendly, and can solve the problem of solvent-based adhesives such as polyvinylidene fluoride and water-based adhesives such as polyacrylonitrile dispersions. The environmental pollution problem of the mixture and the problem affecting the health of the operator; it can meet the requirements of the active material binder in various conditions such as the production, processing, storage and use of lithium-ion secondary batteries

Method used

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  • Lithium-ion secondary battery active material binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] To a reactor equipped with an electromechanical Teflon stirrer, a liquid addition port, a reflux condensing unit, and a nitrogen purge connection, add 500 g of deionized water and 10 g (on a solids basis) of 100 nm particles Emulsion, purged with high-purity nitrogen for at least 60 minutes. Add first-stage monomers (10 g acrylamide, 200 g isooctyl acrylate, 10 g methacrylic acid) and 200 g deionized water and 10 g emulsifier (22.5%, sodium lauryl sulfonate), set Stirring speed is 500 rpm, high-speed dispersion for more than 10 minutes, during which high-purity nitrogen gas is kept flowing.

[0030] Under a high-purity nitrogen atmosphere, the mixture in the reactor was heated to 50 °C. Keep stirring and add 0.2 gram of sodium carbonate dissolved in 10 gram of deionized water sodium carbonate solution, 0.8 gram of ammonium persulfate dissolved in 30 gram of deionized water ammonium persulfate solution. Start polymerization reaction, keep reaction temperature at no mor...

Embodiment 2

[0034] The device used in the synthesis of Example 2 was the same as that of Example 1, except that the amount of seed emulsion with a particle diameter of 100 nanometers was 5 grams. The polymerization steps, residual monomer removal method, neutralization and filtration process of the two stages are all the same as in Example 1.

Embodiment 3

[0036] The device used in the synthesis of Example 3 is the same as that of Example 1, except that the first-stage monomer is a mixture of 10 grams of acrylamide, 180 grams of isooctyl acrylate, 10 grams of methacrylic acid, and 20 grams of acrylonitrile. The polymerization steps, residual monomer removal method, neutralization and filtration process of the two stages are all the same as in Example 1.

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Abstract

The invention provides a lithium ion secondary battery active material binder. Obtained by two-stage emulsion polymerization: the first stage uses hydrophobic monomers as the main polymerized monomers, and puts hydrophilic monomers, additives and dispersion media together in the reactor for stirring; injects high-purity nitrogen to drive oxygen ; Add the initiation system to start polymerization; the polymerized monomer of the second stage is a hydrophilic monomer, which is added to the polymer of the first stage, and then added to the initiation system for polymerization; the weight percent range of the solid content of the obtained adhesive is 10‑ 50%. The lithium ion secondary battery active material binder prepared by the invention adopts a multi-stage polymerization method, which reduces the residue of toxic volatile organic compounds, improves product safety, and saves manufacturing time and cost. The lithium ion secondary battery prepared by using the binder of the present invention has the characteristics of high capacity of active materials, long battery life in high and low temperature cycles, and the like.

Description

technical field [0001] The invention relates to the field of lithium ion battery electrode material preparation, in particular to a lithium ion secondary battery active material binder. Background technique [0002] Lithium-ion secondary batteries are mainly composed of positive electrodes, negative electrodes, separators and electrolytes; positive and negative electrodes are generally made of electrochemically active materials, that is, lithium transition metal oxide positive electrode materials or carbon negative electrode materials, binders, conductive Additives and current collector composition. The preparation method is to mix and grind the electrochemically active material, the conductive additive and the binder solution evenly to form a slurry, coat it on the copper foil or aluminum foil as the current collector, and process it through drying, rolling and other processes. The most widely used adhesives are fluoropolymer adhesives (PVDF) and styrene-butadiene rubber l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M10/0525Y02E60/10
Inventor 王泽伟王桂荣
Owner 汕头市鲁汕化工原料有限公司
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