Negative electrode self-healing adhesive as well as preparation method and application thereof

A self-healing and adhesive technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of poor mechanical properties of negative materials, incomplete electrode structure, affecting battery capacity and cycle performance, etc. The effect of broadening the application temperature range, high mass load, improved capacity retention and cycle stability

Pending Publication Date: 2022-03-04
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned shortcoming of prior art, provide a kind of self-healing adhesive of negative pole and its preparation method and application, to solve the mechanical performance of existing negative pole material of lithium ion battery not good, the electrode structure is incomplete , issues affecting battery capacity and cycle performance

Method used

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  • Negative electrode self-healing adhesive as well as preparation method and application thereof
  • Negative electrode self-healing adhesive as well as preparation method and application thereof
  • Negative electrode self-healing adhesive as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) Add 2g of 2-amino-4-hydroxy-6-methylpyrimidine (UPy) into 50mL of anhydrous dimethyl sulfoxide, and stir at 150°C for 10 minutes. After UPy is dissolved, the solution is cooled to Room temperature and 3.224 g of 2-isocyanatoethyl methacrylate (ICEMA) were added to the flask. The mixture was rapidly cooled using an ice bath, upon cooling a white solid precipitated. The precipitate was collected and washed three times with excess acetone, and dried under vacuum at 30 °C for 4 h to give the monomer 2-(3-(6-methyl-4-oxo-1,4-dihydropyrimidin-2-yl ) ureido) ethyl methacrylate (UPyMA) (90% conversion).

[0060] (2) According to acrylic acid (AA), polyethylene glycol monomethyl ether methacrylate (PEGMA), 2-(3-(6-methyl-4-oxo-1,4-dihydropyrimidine-2- 1.368g of acrylic acid (AA) and 0.3g of polyethylene glycol monomethyl ether methacrylate (PEGMA) at a molar ratio of 95:3:2. Dissolve in a mixed solvent of 8.434mL water and N,N-dimethylformamide (volume ratio: 1:1), form a...

Embodiment 2

[0066] (1) Add 2g of 2-amino-4-hydroxy-6-methylpyrimidine (UPy) into 50mL of anhydrous dimethyl sulfoxide and stir at 150°C for 10 minutes. After UPy dissolves, cool the solution to Room temperature and 3.224 g of 2-isocyanatoethyl methacrylate (ICEMA) were added to the flask. The mixture was rapidly cooled using an ice bath, upon cooling a white solid precipitated. The precipitate was collected and washed three times with excess acetone, and dried under vacuum at 30 °C for 4 h to give the monomer 2-(3-(6-methyl-4-oxo-1,4-dihydropyrimidin-2-yl ) ureido) ethyl methacrylate (UPyMA) (90% conversion).

[0067] (2) According to acrylic acid (AA), polyethylene glycol monomethyl ether methacrylate (PEGMA), 2-(3-(6-methyl-4-oxo-1,4-dihydropyrimidine-2- 1.368g of acrylic acid (AA) and 0.3g of polyethylene glycol monomethyl ether methacrylate (PEGMA) at a molar ratio of 95:3:2. Dissolve in a mixed solvent of 8.434mL water and N,N-dimethylformamide (volume ratio: 1:1), form a homogene...

Embodiment 3

[0073] (1) Add 2g of 2-amino-4-hydroxy-6-methylpyrimidine (UPy) into 50mL of anhydrous dimethyl sulfoxide and stir at 150°C for 10 minutes. After UPy dissolves, cool the solution to Room temperature and 3.224 g of 2-isocyanatoethyl methacrylate (ICEMA) were added to the flask. The mixture was rapidly cooled using an ice bath, upon cooling a white solid precipitated. The precipitate was collected and washed three times with excess acetone, and dried under vacuum at 30 °C for 4 h to give the monomer 2-(3-(6-methyl-4-oxo-1,4-dihydropyrimidin-2-yl ) ureido) ethyl methacrylate (UPyMA) (90% conversion).

[0074] (2) According to acrylic acid (AA), polyethylene glycol monomethyl ether methacrylate (PEGMA), 2-(3-(6-methyl-4-oxo-1,4-dihydropyrimidine-2- 1.031g of acrylic acid (AA) and 0.895g of polyethylene glycol monomethyl ether methacrylate (PEGMA) at a molar ratio of 80:10:10. Dissolve in a mixed solvent of 7.160mL water and N,N-dimethylformamide (volume ratio 1:1), form a homog...

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Abstract

The invention discloses a negative electrode self-healing adhesive as well as a preparation method and application thereof. The adhesive consists of two components, namely a triblock polymer and a small molecular plasticizer. The adhesive has the characteristic of multiple functions, and the polyacrylic acid block is rich in carboxyl and has very strong acting force with an active material, a current collector and a conductive agent, so that high adhesive force is realized; due to the fact that a poly 2-(3-(6-methyl-4-oxo-1, 4-dihydropyrimidine-2-yl) ureido) ethyl methacrylate (UPyMA) block can form a strong and dynamic quadruple hydrogen bond, the poly 2-(3-(6-methyl-4-oxo-1, 4-dihydropyrimidine-2-yl) ureido) ethyl methacrylate (UPyMA) block not only can adapt to stress generated by a large-volume expansion negative electrode, but also can effectively repair electrode damage generated by volume expansion, and efficient self-repairing is achieved; the polyethylene glycol monomethyl ether methacrylic acid block is rich in ether bonds, so that rapid Li < + > conduction can be realized, and a rapid ion conduction path is formed.

Description

technical field [0001] The invention belongs to the technical field of energy batteries, and in particular relates to a negative self-healing adhesive and a preparation method and application thereof. Background technique [0002] With the development of consumer electronics, new energy vehicles, and large-scale energy storage, lithium-ion batteries with high energy density, long cycle life, high rate safety, and low cost have attracted extensive attention. [0003] The current commercial lithium-ion battery anode materials use graphite-based anode materials, which are non-toxic and stable in the air. However, there are two fatal defects of graphite negative electrode: low energy density (theoretical specific capacity is 372mAh g -1 ) and potential safety hazards (serious "lithium analysis") make it unable to meet the needs of new application fields. Therefore, seeking new high specific capacity, high safety and long cycle negative electrode materials to replace graphite n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525C08F220/06C08F220/28C08F220/36
CPCH01M4/622H01M10/0525C08F220/06H01M2004/027C08F220/286C08F220/36Y02E60/10
Inventor 宋江选张永
Owner XI AN JIAOTONG UNIV
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