Water-soluble self-healing binding agent, preparation method thereof and lithium ion battery

A technology of lithium-ion batteries and binders, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of silicon anode materials being close to each other, and achieve the effects of mild conditions, improved cycle performance rate performance, and simple preparation process

Active Publication Date: 2019-07-26
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that the current lithium-ion battery binder still cannot make the specific capacity of the silicon negative electrode material approach its theoretical specific capacity in terms of increasing the specific capacity of the silicon negative electrode material, the present invention provides a water-soluble self-healing binder and its preparation method

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  • Water-soluble self-healing binding agent, preparation method thereof and lithium ion battery
  • Water-soluble self-healing binding agent, preparation method thereof and lithium ion battery
  • Water-soluble self-healing binding agent, preparation method thereof and lithium ion battery

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preparation example Construction

[0033] In one embodiment, the preparation method of the water-soluble self-healing adhesive at least includes the following steps:

[0034] Step S01. Under an inert atmosphere, 2-(6-isocyanate hexylamine amide)-6-methyl-4-[H]-pyrimidinone, hydroxyethyl acrylate, catalyst and the first organic solvent are mixed and refluxed ;

[0035] Step S02. Adding a precipitating agent to the reaction solution obtained in step S01 to obtain a precipitate;

[0036] Step S03. Under an inert atmosphere, dissolve the precipitate and tert-butyl acrylate in a second organic solvent to obtain a mixed solution, and add an initiator to the mixed solution to cause free radical polymerization to obtain a polymerization thing;

[0037] Step S04. Using a third organic solvent to hydrolyze the polymer to obtain the water-soluble self-healing adhesive as described above.

[0038] Next, the preparation method will be further explained.

[0039] The inert gas involved in the inert atmosphere conditions ...

Embodiment 1

[0068] A preparation method of a water-soluble self-healing adhesive, comprising the following steps:

[0069] (1) Dissolve 1.5g of 2-(6-isocyanate hexylamine amide)-6-methyl-4-[H]-pyrimidinone and 1.0g of hydroxyethyl acrylate in 50mL of chloroform, add 0.05g of dilauric acid di Butyltin, reacted at 40°C for 12h under nitrogen protection;

[0070] (2) Cool the reaction solution in step (1) to room temperature, add 200mL of ether to precipitate the product, filter under reduced pressure and vacuum dry at 40°C to obtain the small molecule ureidopyrimidinone hexylaminoethyl acrylate (UPy -HDI-HEA);

[0071] (3) Dissolve 0.4g of monomer UPy-HDI-HEA and 8.0g of tert-butyl acrylate in 30mL of dioxane solvent, add 10mg of AIBN initiator, and react at 70°C for 12h under nitrogen protection to obtain PtBA-UPy;

[0072] (4) Hydrolyze the obtained polymer PtBA-UPy solution with 100mL trifluoroacetic acid, hydrolyze for 24h, evaporate the solvent and trifluoroacetic acid to dryness und...

Embodiment 2

[0081] A preparation method of a water-soluble self-healing adhesive, comprising the following steps:

[0082] (1) Dissolve 2.0g of 2-(6-isocyanate hexylamine amide)-6-methyl-4-[H]-pyrimidinone and 1.0g of hydroxyethyl acrylate in 60mL of chloroform, add 0.15g of triethylamine, Reaction at 60°C for 15h under nitrogen protection;

[0083] (2) Cool the reaction solution in step (1) to room temperature, add 250 mL of ether to precipitate the product, filter under reduced pressure and vacuum dry at 50°C to obtain the small molecule ureidopyrimidinone hexylaminoethyl acrylate (UPy -HDI-HEA);

[0084] (3) Dissolve 0.4g of monomer UPy-HDI-HEA and 9.0g of tert-butyl acrylate in 50mL of dioxane solvent, add 15mg of BPO initiator, and react at 70°C for 12h under nitrogen protection to obtain PtBA-UPy;

[0085] (4) The obtained polymer PtBA-UPy solution was hydrolyzed with 90 mL of trifluoroacetic acid for 34 hours, the solvent and trifluoroacetic acid were rotary evaporated to dryness...

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Abstract

The invention provides a water-soluble self-healing binding agent, a preparation method thereof and a lithium ion battery. The water-soluble self-healing binding agent is provided with a general formula shown in specification formula (I). In the water-soluble self-healing binding agent, quadrupolar hydrogen bonds having favorable reversibility are contained in a molecule structure, can be reversely broken under external simulation such as an external force or a temperature and are generated again after the external simulation disappears, certain mechanical strength is shown, the water-solubleself-healing binding agent has favorable self-heating performance, great probability is provided for preparing a self-preparing material, the water-soluble self-healing binding agent can be used as abinding agent of a silicon or silicon carbon negative electrode of the lithium ion battery, so that the prepared lithium ion battery has favorable electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a water-soluble self-healing binder, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in various electronic devices such as digital cameras, mobile phones, tablet computers, and notebook computers due to their advantages such as high working voltage, high energy density, and no memory effect. In recent years, with the continuous miniaturization of electronic products and the continuous development of hybrid electric vehicles and pure electric vehicles, people have higher and higher requirements for the energy density of lithium-ion batteries. The key to improving the energy density of lithium-ion batteries is to increase the energy density of electrode materials. The current commercial lithium-ion battery anode materials are mainly carbon anode materials, represented by graphite, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/134H01M10/0525
CPCH01M4/134H01M4/622H01M10/0525Y02E60/10
Inventor 邓永红张光照
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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