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Dynamic ion cross-linked polyacrylic acid-polyethylene glycol hydrogel binding agent and preparation method and application thereof

A hydrogel adhesive, polyethylene glycol technology, applied in the direction of secondary batteries, structural parts, electrochemical generators, etc., can solve the problems of conductive network rupture, active material loss, weak van der Waals force, etc., to maintain Stability, strong mechanical strength and tensile strength, stress relief effect

Active Publication Date: 2019-06-14
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the force between the commercial binders PVDF and SBR and the silicon-based material is weak van der Waals force, which is difficult to resist the huge stress caused by the volume change of the silicon-based material, resulting in the rupture of the conductive network, the loss of the active material, and finally rapid capacity decay

Method used

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  • Dynamic ion cross-linked polyacrylic acid-polyethylene glycol hydrogel binding agent and preparation method and application thereof
  • Dynamic ion cross-linked polyacrylic acid-polyethylene glycol hydrogel binding agent and preparation method and application thereof
  • Dynamic ion cross-linked polyacrylic acid-polyethylene glycol hydrogel binding agent and preparation method and application thereof

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preparation example Construction

[0028] The invention discloses a dynamically ionically cross-linked polyacrylic acid-polyethylene glycol hydrogel adhesive and its preparation method and application; the preparation of the material specifically includes the following steps:

[0029] Step 1, prepare PEG aqueous solution, add polyethylene glycol (PEG) with a weight average molecular weight of 400-20000 into deionized water, stir to dissolve completely, and obtain a PEG aqueous solution with a mass concentration of 5-10%, marked as A solution.

[0030] Step 2, synthesizing the acrylic acid prepolymer, adding the acrylic acid monomer into deionized water to obtain an acrylic acid aqueous solution with a mass concentration of 10-25%, adding a redox initiator, which is a type of initiator that is easily decomposed into free The base compound is one or both of sodium metabisulfite or ammonium persulfate, and when the initiator is a mixture of the two, it is an initiator mixed in equimolar amounts; the amount of the ...

Embodiment 1

[0043] Dissolve PEG and acrylic acid monomers with Mw=400 in deionized water, respectively configure aqueous solutions with a mass fraction of 5% and 15%, add an initiator of 0.1 wt% of acrylic acid monomer mass in the aqueous acrylic acid solution, and the initiator is sodium metabisulfite ;Raise the temperature of the acrylic acid aqueous solution containing the initiator to 90°C, add the PEG aqueous solution dropwise to the acrylic acid aqueous solution containing the initiator according to the mass ratio of 1:9, stir and mix evenly, and the reaction occurs. When the reaction system is viscous, the reaction ends Finally, a hydrogel polymer with a stable three-dimensional network structure is formed, and 10% NaOH aqueous solution is added to the polymer to obtain the adhesive A1.

[0044] The binder A1 that prepares is used in ion secondary battery, and the preparation process of this battery comprises the following steps:

[0045] Step 1, prepare micron silicon, carbon blac...

Embodiment 2

[0052] PEG and acrylic acid monomers with Mw=800 were dissolved in deionized water, and aqueous solutions with mass fractions of 10% and 15% were prepared respectively, and an initiator of 1 wt% of acrylic acid monomer mass was added to the aqueous acrylic acid solution, and the initiator was sodium metabisulfite; Raise the temperature of the acrylic acid aqueous solution containing the initiator to 80°C, add the PEG aqueous solution dropwise to the acrylic acid aqueous solution containing the initiator according to the mass ratio of 3:7, stir and mix evenly, and the reaction occurs. After the reaction, water with a stable three-dimensional network structure is generated. Gel polymer, adding 20% ​​NaOH aqueous solution to the polymer, namely to prepare adhesive A2.

[0053] A lithium-ion battery was assembled according to the above method using binder A2 and its electrochemical performance was tested.

[0054] The prepared binder A2 was used in the preparation of an ion second...

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Abstract

The invention discloses a dynamic ion cross-linked polyacrylic acid-polyethylene glycol hydrogel binding agent and preparation method and application thereof. The dynamic ion cross-linked polyacrylicacid-polyethylene glycol hydrogel binding agent is prepared by a one-pot method. The binding agent combines favorable conductive iconicity of polyethylene glycol and the performance of acrylic acid capable of polymerization, and a three-dimensional network structure capable of ion conduction can be formed; the three-dimensional network structure of the binding agent can have excellent dynamic performance, and the stress generated by an active material during the charge and discharge process can be effectively reduced; and due to the introduction of dynamic ions, dynamic ions are attached ontothe whole three-dimensional network structure, the whole three-dimensional network has a self-recovery effect, the crack generated by a silicon negative electrode after long-term circulation to induceand generate larger crack in subsequent circulation can be effectively prevented or recovered by the self-recovery function of the binding agent, so that the stability of an electrode structure is maintained.

Description

【Technical field】 [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a dynamic ion-crosslinked polyacrylic acid-polyethylene glycol hydrogel adhesive and a preparation method and application thereof. 【Background technique】 [0002] With the rapid development of human society, the demand for energy continues to increase. Today, the shortage of fossil energy and the energy crisis have become a huge challenge to society. As a new type of secondary battery, lithium-ion batteries have the advantages of large capacity, high working voltage, high energy density, low self-discharge rate, long cycle life, and no memory effect. capable device. [0003] Lithium-ion batteries are widely used in various fields due to their high energy density, high operating voltage, low self-discharge, and good cycle performance. Graphite has a wide range of sources and low prices, and is one of the ideal lithium-ion battery anode materials, but l...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525C08F120/06
CPCY02E60/10
Inventor 宋江选焦星星
Owner XI AN JIAOTONG UNIV
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