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Lithium ion battery binding agent and preparation method and application thereof

A lithium-ion battery and binder technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle performance, pole piece cracks, insufficient toughness, etc., and achieve low cost, simple operation, and easy industrialization. production effect

Active Publication Date: 2019-05-21
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a lithium-ion battery binder, which aims to solve the problem of insufficient toughness of the existing polyacrylic linear binder due to its relatively regular molecular chain, and the brittleness of the binder itself during battery cycles. And lead to technical problems such as cracks and peeling of the pole piece that lead to poor cycle performance

Method used

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  • Lithium ion battery binding agent and preparation method and application thereof
  • Lithium ion battery binding agent and preparation method and application thereof
  • Lithium ion battery binding agent and preparation method and application thereof

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preparation example Construction

[0045] The embodiment of the present invention provides a kind of preparation method of lithium ion battery binder, comprises the following steps:

[0046] S10. Obtain multi-component small molecules, initiators and monomers, wherein the monomers are selected from acrylic monomers or non-acrylic monomers;

[0047] S20. Mixing and dissolving the multi-component small molecules, initiators and monomers in a liquid medium, and performing a polymerization reaction to obtain a crude product;

[0048] S30. When the monomer is an acrylic monomer, purify the crude product to obtain a non-linear lithium ion battery binder; when the monomer is a non-acrylic monomer, purify the crude product After purification, it is converted and purified again to obtain a non-linear lithium ion battery binder.

[0049] The preparation method of the lithium-ion battery binder provided in the embodiment of the present invention takes the multi-component small molecule as the core, and under the action o...

Embodiment 1

[0077] S10. 10mM trimethylolpropane bromide, PEMTA / CuBr (pentamethyldiethylenetriamine / copper bromide) (30mM / 30mM) initiator and 5M tert-butyl methacrylate monomer were dried Under an inert gas atmosphere, use the solvent DMF in the reaction kettle to stir and dissolve at a stirring speed of 300-500rpm to obtain a solution;

[0078] S20. Raise the reaction temperature to 80° C. with a stirring speed of 300 rpm under a dry inert gas atmosphere, and react the solution for 24 hours. After cooling, a crude product is obtained;

[0079] S30. The crude product is repeatedly dissolved and precipitated with good and bad solvents for purification; then the purified multi-arm (3-arm) poly-tert-butyl methacrylate is hydrolyzed under the action of trifluoroacetic acid; finally, the product is dialyzed and freeze-dried Obtain the nonlinear lithium ion battery binder 1, the molecular structure is as attached figure 1 mentioned.

Embodiment 2

[0081] S10. Dissolve 10mM pentaerythritol, 40M cerium ammonium nitrate initiator and 20M acrylonitrile monomer in a reaction kettle with solvent water 5 times the volume of the monomer at a stirring speed of 300-500rpm to obtain a solution;

[0082] S20. Raise the reaction temperature of the solution to 40° C., the stirring speed is 300 rpm, and react for 24 hours. After cooling, a crude product is obtained;

[0083] S30. The crude product is repeatedly dissolved, precipitated and purified with good and bad solvents; then the purified multi-arm (4-arm) polyacrylonitrile is hydrolyzed with 1M LiOH; finally, the product is dialyzed and freeze-dried to obtain a non-linear lithium ion battery. Binder 2, molecular structure as attached figure 2 shown.

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Abstract

The invention belongs to the technical field of the lithium ion battery, and especially relates to a lithium ion battery. The lithium ion battery comprises a nonlinear multi-arm homopolymer composed of multi-element small-molecular nuclear parent and polyacrylic acid or polyacrylate branch arm connected to the multi-element small-molecular nuclear parent; the flexibility of the binding agent is increased due to the nonlinear polyacrylic acid or polyacrylate multi-arm structure, and the nonlinear structure has the advantages of multi-dimension efficient binding and water solubility. Relative tothe linear polyacrylic acid type binding agent, the defect that the molecule is fragile is improved to a certain degree. The problem that the cycle performance is bad since the pole plate produces the cracking and peeling and like phenomena due to the own fragility of the binding agent in the battery cycle is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery binder and a preparation method and application thereof. Background technique [0002] Lithium-ion battery, as a green and environment-friendly energy storage technology, is in line with people's pursuit of protecting the environment and alleviating the energy crisis, and has been widely researched, produced and applied. Improving the energy density of lithium-ion batteries has always been a hot and difficult point in the research of lithium-ion battery technology. Because of its theoretical capacity of 4200mAh / g, silicon-based negative electrode materials have more room for research in improving the energy density of lithium-ion batteries compared to traditional graphite carbon-based negative electrode materials (theoretical capacity (372mAh / g), which is currently the most researched It is also one of the most promising new high e...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCY02E60/10
Inventor 邓永红罗超吴秀芬王朝阳
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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