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Network structure ionic conductive adhesive as well as preparation method and application of ionic conductive adhesive

A technology of ion conduction and network structure, applied in the direction of structural parts, circuits, electrical components, etc., can solve problems such as difficulty in adapting to the challenges of negative electrode materials, and achieve the effects of low cost, good safety and environmental friendliness

Active Publication Date: 2021-07-13
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they are still linear structures, which are difficult to adapt to the various challenges brought about by the large volume expansion of negative electrode materials.

Method used

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  • Network structure ionic conductive adhesive as well as preparation method and application of ionic conductive adhesive
  • Network structure ionic conductive adhesive as well as preparation method and application of ionic conductive adhesive
  • Network structure ionic conductive adhesive as well as preparation method and application of ionic conductive adhesive

Examples

Experimental program
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Effect test

preparation example Construction

[0031] A preparation method of a network structure ion conductive adhesive, comprising the following steps:

[0032] Step 1, preparing a Pluronic aqueous solution, adding Pluronic to deionized water, stirring to dissolve it completely, and preparing a Pluronic aqueous solution with a mass concentration of 5%-30%;

[0033] Step 2, add acrylic acid monomer into deionized water, stir to dissolve it completely, and prepare an acrylic acid aqueous solution with a mass concentration of 25%-50%, and add lithium hydroxide powder to adjust the pH of the acrylic acid aqueous solution to 5-7; The mass ratio of body (AA) to Pluronic is (7-9): (1-3);

[0034] Step 3, adding an initiator into the acrylic acid solution, the initiator is a compound that is easily decomposed into free radicals, and is any one of ammonium persulfate or sodium metabisulfite, and the amount of the initiator is 0.05%- 2%;

[0035] Step 4, the temperature of the solution in which the acrylic acid and the initiator ...

Embodiment 1

[0050] Dissolve F127 and acrylic acid monomers in deionized water, prepare aqueous solutions with mass fractions of 5% and 30%, respectively, add lithium hydroxide powder to adjust the pH of the acrylic acid aqueous solution to 5, and add 0.1 wt% of acrylic acid monomers to the acrylic acid aqueous solution ammonium persulfate initiator; heat the acrylic acid solution containing the initiator to 80°C, add F127 aqueous solution dropwise, and react under nitrogen protection and magnetic stirring. The reaction temperature is kept at 80°C. After the reaction is carried out for 1 hour, the reaction ends. Wherein, the mass ratio of acrylic acid monomer and F127 is 9:1. Adhesive A1 was thus prepared.

[0051] The synthesized binder A1 was used to prepare the nano-silicon negative electrode of the lithium ion battery, and all the steps were the same as in Comparative Example 1, except that the binder used in the preparation of the slurry was the synthesized binder A1.

[0052] The li...

Embodiment 2

[0054] Synthesize the ion-conductive polyacrylic acid-Pluronic adhesive A1 with network structure, and all steps are the same as in Example 1.

[0055] The synthetic network structure ion-conductive binder A1 was used to prepare the nano-silicon-carbon negative electrode of the lithium-ion battery. All the steps were the same as in Comparative Example 2, except that the binder used in the preparation of the slurry was the synthesized binder A1.

[0056] A lithium-ion battery assembled with a silicon-carbon negative electrode prepared by using the network structure ion-conductive binder A1 was tested, and all steps were the same as in Comparative Example 2.

[0057] Depend on figure 2 It can be seen that the adhesive is used in lithium-ion batteries, and the electrode sheets before and after the cycle can show that the electrode sheets still maintain good integrity after 100 cycles of recycling, which can more intuitively explain that the adhesive has good performance in lithi...

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Abstract

The invention discloses a network structure ionic conductive adhesive as well as a preparation method and an application thereof. The adhesive is synthesized through a 'one-pot method', the preparation process is simple, and the adhesive combines the excellent adhesion performance of polyacrylic acid to an active material and the good ionic conductivity of a polyoxyethylene polyoxypropylene ether block copolymer chain segment; and meanwhile, a three-dimensional cross-linked network structure is formed through condensation reaction. When the adhesive is applied to a lithium ion battery negative electrode, the problem of electrode structure degradation in the charging and discharging process can be effectively solved, and the electrochemical performance of the electrode is improved; by the three-dimensional network structure, the adhesive has excellent mechanical properties, and stress generated by an active material in the charging and discharging process can be effectively relieved; and the ionic conductivity provides a lithium ion migration channel for the electrode, so that the transportation of lithium ions is promoted, and the ionic conductivity has important significance for improving the rate capability of the electrode.

Description

technical field [0001] The invention belongs to the technical field of energy batteries, and in particular relates to a network-structured ion-conductive adhesive and a preparation method and application thereof. Background technique [0002] With the rapid development of society and economy, traditional fossil energy such as coal and oil can no longer meet people's requirements for energy development in today's era due to their shortcomings such as non-renewability, limited reserves, and serious pollution. Therefore, the effective development and large-scale utilization of green, clean, safe and efficient new energy technologies are of great significance for alleviating the energy and environmental crises faced by mankind and for the sustainable development of human society in the future. [0003] As a new type of green rechargeable energy storage device, lithium-ion batteries have the advantages of high energy density, high working voltage, long service life, and environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525C08F220/06
CPCH01M4/622H01M10/0525C08F220/06Y02E60/10
Inventor 宋江选袁晓东
Owner XI AN JIAOTONG UNIV
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