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Binder with three-dimensional network structure and preparation method and application thereof

A technology of network structure and binder, which is applied in the direction of structural parts, electrical components, electrochemical generators, etc., can solve the problems of poor cycle performance of electrode materials, achieve improved cycle stability, improve the first charge and discharge efficiency, and improve Effect of the override characteristic

Active Publication Date: 2020-01-10
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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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 three-dimensional network structure binder and its preparation method and application. The binder has both the cohesiveness of polyacrylic acid and the high elasticity of polyurethane, and solves the problem of poor cycle performance of electrode materials. technical issues

Method used

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  • Binder with three-dimensional network structure and preparation method and application thereof
  • Binder with three-dimensional network structure and preparation method and application thereof
  • Binder with three-dimensional network structure and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of organic solvent system polyacrylic acid / polyurethane three-dimensional network structure binder (structure Ⅰ):

[0043] (1) Preparation of isocyanate-terminated polyurethane prepolymer:

[0044] Add A4 molecular sieves into the Shrek reaction bottle, use acetylene flame to remove water, and at the same time evacuate the water and oxygen in the bottle; add N-methylpyrrolidone NMP after cooling to obtain anhydrous and oxygen-free NMP solvent. Polypropylene glycol PPG400 was dissolved in the above-mentioned NMP to obtain a 10% clear solution, and a certain amount of isophorone diisocyanate was added for polycondensation to obtain an isocyanate-terminated polyurethane prepolymer as component A.

[0045] (2) First, polyurethane (BASF TPU1195A10) and polyacrylic acid (Aladdin analytical grade, Mw 450,000) were dehydrated at 100° C. and 0.1 MP vacuum for 5 hours, respectively.

[0046] Dissolve 0.5g polyacrylic acid in anhydrous NMP, heat and stir at 60°C to ma...

Embodiment 2

[0052] Preparation of organic solvent system polyacrylic acid / polyurethane three-dimensional network structure binder (structure Ⅰ):

[0053] (1) Preparation of isocyanate-terminated polyurethane prepolymer:

[0054] Add A4 molecular sieve into the Shrek reaction bottle, use acetylene flame to remove water, and at the same time evacuate the water and oxygen in the bottle; after cooling, add N-methylpyrrolidone (NMP) to prepare anhydrous and oxygen-free NMP solvent. Dry the 500mL four-necked flask and the condensing reflux tube in advance. Polyethylene glycol was dehydrated in vacuum at 120°C and 0.1MPa for 5h. Under the protection of nitrogen, 22g of anhydrous NMP, 90g of vinyl acetate, and 88.14g of polyethylene glycol were added, condensed and refluxed at 80°C, and stirred for 1 hour until the solution was transparent and clear. Add 110.04 g of isophorone diisocyanate in one go, stir, and react for 3 hours. Dissolve 1,4-butanediol and hydroquinone in 15ml of ethyl acetate...

Embodiment 3

[0061] Preparation of organic solvent system polyacrylic acid / polyurethane grafted three-dimensional network structure binder (structure Ⅱ):

[0062] (1) Preparation of isocyanate-terminated low molecular weight polyurethane prepolymer (Mw 5,000)

[0063] Add A4 molecular sieves into the Shrek reaction bottle, use acetylene flame to remove water, and at the same time evacuate the water and oxygen in the bottle; add N-methylpyrrolidone NMP after cooling to obtain anhydrous and oxygen-free NMP solvent. Polytetrahydrofuran was dissolved in the above NMP to obtain a 0.5% clear solution, and 0.05 mol of isophorone diisocyanate was added to modify it into an isocyanate-terminated polyurethane prepolymer as component A.

[0064] (2) Preparation of isocyanate-terminated high molecular weight polyurethane (Mw 100,000)

[0065] Dry the 500mL four-necked flask and the condensing reflux tube in advance. Polytetrahydrofuran was vacuum dehydrated at 80°C and 0.1 MPa for 5 hours; under nit...

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Abstract

The invention relates to a binder with a three-dimensional network structure and a preparation method and an application thereof. The binder is formed by cross-linking a low-molecular-weight polyurethane prepolymer by taking high-molecular-weight polyacrylic acid and high-molecular-weight polyurethane as chain-shaped brackets. The binder has the cohesiveness of polyacrylic acid and the high elasticity of polyurethane, and can firmly bind an active material and a conductive agent together. In the charging and discharging process, the active material expands and contracts, and the binder can expand and contract along with the expansion and contraction of the active material. Thus, the structural stability of an electrode material can be well maintained, the electrode does not come off in thecharging and discharging process, and the cycling stability and the rate capability can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery binder and its preparation and application, in particular to a three-dimensional network structure binder and its preparation method and application. Background technique [0002] Batteries for hybrid electric vehicles require electrode materials with high energy density. Materials such as sulfur, silicon, and tin have large theoretical capacities, but at the same time face severe volume expansion problems. During the process of intercalating and removing lithium, the volume of the active material expands enormously, causing the peeling between the active particles, and the active material falls off from the current collector, which leads to the destruction of the electrode structure and increases the electron and ion conduction impedance. The resulting electrode cycle stability is poor and the energy density decays quickly, which limits the application of these materials in the lithiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M10/0525Y02E60/10
Inventor 李英芝程化卢周广廖成竹王旭扬
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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