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High-carbon-residue high-molecular emulsion microsphere and manufacturing method thereof

A polymer emulsion and water-soluble polymer technology, applied in electrical components, circuits, battery electrodes, etc., can solve the problems of large specific surface area, low carbon residue, and high impurities, and achieve the reduction of specific surface area and the amount of carbon residue Effect of high and low specific surface area

Inactive Publication Date: 2013-12-25
南京毕汉特威高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the above-mentioned existing surface modification materials and technologies, there are many shortcomings such as high impurities, environmental hazards, low carbon residue, and large specific surface area. After repeated research and demonstration, the present invention proposes a new surface modification material - high The polymer emulsion microspheres with acrylonitrile content and the polymerization method of polymer emulsion microspheres with high acrylonitrile content solve the above problems: the emulsion microspheres do not contain metal ion impurities, and subsequent impurity removal processes are not required; the production of emulsion microspheres In the process, deionized water is used as solvent without adding any organic solvent, which is environmentally friendly; after the slurry is dried and sintered at high temperature, the residual carbon content is high, and the specific surface area of ​​the powder material after coating is improved

Method used

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  • High-carbon-residue high-molecular emulsion microsphere and manufacturing method thereof
  • High-carbon-residue high-molecular emulsion microsphere and manufacturing method thereof
  • High-carbon-residue high-molecular emulsion microsphere and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Dissolve 5 parts by weight of polyvinyl alcohol PVA205 (polymerization degree 500, alcoholysis degree 88.5 mol%, Japan Kuraray) in 120 parts by weight deionized water, and add 30 parts by weight of styrene and 70 parts by weight of acrylonitrile while stirring. Emulsify to obtain monomer emulsified dispersion.

[0033] Add 70 parts by weight of deionized water and 5 parts by weight of methanol to a glass reactor (Shanghai Heqi Glass Instrument Co., Ltd.) equipped with a reflux condenser, a separatory funnel, a thermometer, and a nitrogen pipe. Add 0.5 parts by weight of ammonium persulfate dissolved in 10 parts by weight of water as an initiator solution at ℃. After 2 minutes, use a plunger pump (Tokyo Rika VSP-1050) to add the monomer emulsion dispersion to the reactor. 4 The dripping was completed within hours, and the reaction was continued for 2 hours after the dripping was completed to obtain a polymer emulsion with a solid content of 33.8 wt% and a pH of 4.8. See th...

Embodiment 2

[0065] 20 parts by weight of polyvinylpyrrolidone PVP was dissolved in 120 parts by weight of deionized water, and 10 parts by weight of isoprene and 90 parts by weight of methacrylonitrile were added while stirring to emulsify to obtain a monomer emulsion dispersion.

[0066] Add 70 parts by weight of deionized water and 15 parts by weight of isopropanol to a high-pressure reactor equipped with a thermometer and a nitrogen pipe (Wuxi Mingyan Group Co., Ltd.). The temperature is raised to 80°C, and 1 part by weight is added at 80°C. An initiator solution prepared by dissolving sodium persulfate in 10 parts by weight of water. After 2 minutes, add the monomer emulsified dispersion liquid in the early stage to the reactor. After 8 hours of dripping, continue the reaction for 2 hours after the dripping to obtain the solid content. It is a 36.5wt% polymer emulsion with a pH of 4.5.

[0067] Carbon residue measurement: The obtained polymer emulsion was dried at 105°C for 24 hours, and t...

Embodiment 3

[0071] Dissolve 20 parts by weight of polyvinyl alcohol PVA205 (polymerization degree 500, alcoholysis degree 88.5 mol%, Japan Kuraray) in 120 parts by weight deionized water, and add 30 parts by weight of ethyl acrylate and 70 parts by weight of acrylonitrile while stirring Perform emulsification to obtain a monomer emulsified dispersion.

[0072] Add 70 parts by weight of deionized water and 45 parts by weight of butanol to a glass reactor equipped with reflux condenser, separatory funnel, thermometer and nitrogen gas pipe. The temperature is raised to 80°C, and 4.5 parts by weight of tert-butyl are added at 80°C. Initiator solution prepared by dissolving base hydrogen peroxide in 10 parts by weight of water, 1.0 part by weight of glucose as reducing agent, add the monomer emulsion dispersion in the reactor after 2 minutes, and finish dripping in 4 hours. The reaction was continued for 2 hours to obtain a polymer emulsion with a solid content of 33.8 wt% and a pH value of 1.3. ...

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Abstract

The invention relates to a high-carbon-residue high-molecular emulsion microsphere and a manufacturing method thereof. The outer side of the high-molecular emulsion microsphere is a water-soluble high-molecular polymer, and the inner side of the high-molecular emulsion microsphere contains acrylonitrile or methacrylonitrile of over 40 wt% and other organic elements of below 60 wt%. The high-molecular emulsion microsphere is obtained through the method including the steps that under the condition of dispersion stability of the water-soluble high-molecular polymer with over 1000 molecular weights, emulsion dispersoids manufactured from 40-90 wt% acrylonitrile monomers or methacrylonitrile monomers and 10-60 wt% another kind of or kinds of copolymerized unsaturated monomers are subjected to emulsion polymerization on the premise that peroxide initiators and organic alcohols exist, and then the high-molecular emulsion microsphere is synthesized. The high-molecular emulsion microsphere can be applied to surface modification of inorganic powder materials, especially the surface modification of lithium ion battery anode materials and lithium ion battery cathode materials.

Description

Technical field [0001] The invention relates to the basic structure of a polymer emulsion microsphere with high acrylonitrile content and its polymerization reaction process. Polymer emulsion microspheres can be used to modify the surface of inorganic powder materials, especially the surface modification of positive and negative materials for lithium ion batteries. Background technique [0002] Commonly used anode materials for lithium-ion batteries include lithium cobalt oxide, lithium manganate, ternary materials, and lithium iron phosphate, and anode materials include natural graphite, artificial graphite, silicon-carbon alloy, tin-carbon alloy, etc. Electrode materials composed of pure phases encounter various problems in use, and surface modification of the materials is one of the ways to solve the problems. [0003] For example, natural graphite, which is the negative electrode material, has the advantages of high specific capacity, flat charge and discharge curve and low co...

Claims

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Application Information

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IPC IPC(8): C08F261/04C08F271/02C08F251/02C08F283/06C08F220/44C08F2/22H01M4/36
CPCY02E60/10
Inventor 刘祥
Owner 南京毕汉特威高分子材料有限公司
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