A kind of lithium battery negative electrode binder and its preparation method and application

A technology for the preparation of binders and lithium batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reduced negative active material content, large difference in the impedance of negative electrode sheets, and easy cracking of negative electrode sheets. Processing is not easy to break, the effect of excellent hydrophilicity

Active Publication Date: 2022-03-29
FULLYMAX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method to reduce the impedance of the negative electrode sheet is mainly to increase the content of the negative electrode conductive agent, but this method will lead to a corresponding decrease in the content of the negative electrode active material, thereby reducing the capacity of the battery
Under the premise of not reducing the battery capacity, the impedance of the negative electrode sheet prepared by using different negative electrode binders is quite different. For example, the impedance of the negative electrode sheet prepared by using polyacrylonitrile emulsion as the binder is small, but the disadvantage is: the negative electrode sheet is coated It is easy to crack in the cloth process, brittle in the rolling and bending process, and easy to drop powder in the electrode sheet cutting process; the negative electrode sheet prepared with styrene-butadiene rubber as the binder has a large impedance, but it has the property of coating without cracking , the pole piece is soft and so on

Method used

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  • A kind of lithium battery negative electrode binder and its preparation method and application
  • A kind of lithium battery negative electrode binder and its preparation method and application
  • A kind of lithium battery negative electrode binder and its preparation method and application

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a negative electrode binder for lithium batteries and its preparation method and application. The advantages of the styrene-butadiene rubber binder, using the binder to prepare a negative electrode sheet with small impedance and excellent processability, and using the negative electrode sheet to manufacture lithium batteries, to solve the existing technical problems: when the lithium battery is discharged at a large rate, the surface of the battery The temperature rises sharply, which is manifested as an undercut in the initial stage of the discharge curve, which has a great potential safety hazard.

[0031] Calculated in parts by mass, the raw materials for the preparation of the binder in this embodiment include the following components: 41.0 parts of polyacrylonitrile emulsion, 10.0 parts of butadiene and 10.0 parts of styrene.

[0032] The preparation method of the lithium battery negative electrode binder specifically includes the following...

Embodiment 2

[0052] This example provides a lithium battery negative electrode binder and its preparation method and application. Compared with Example 1, the binder in this example has adjusted the composition and proportion of the raw materials for preparation, as well as the process of the preparation method parameter. Calculated in parts by mass, the raw materials for the preparation of the binder in this embodiment include the following components: 51.0 parts of polyacrylonitrile derivative emulsion, 20.0 parts of butadiene derivative and 20.0 parts of styrene.

[0053] The structural formula of polyacrylonitrile derivatives is as follows:

[0054]

[0055] Wherein, R1 is an amino group.

[0056] The structural formula of butadiene derivatives is as follows:

[0057]

[0058] Wherein, R2 is amino.

[0059] The preparation method of the lithium battery negative electrode binder specifically includes the following steps:

[0060] S1. Prepare each component according to the raw...

Embodiment 3

[0068] This example provides a lithium battery negative electrode binder and its preparation method and application. Compared with Example 1, the binder in this example has adjusted the composition and proportion of the raw materials for preparation, as well as the process of the preparation method parameter. Calculated in parts by mass, the raw materials for the preparation of the binder in this embodiment include the following components: 44.0 parts of polyacrylonitrile derivative emulsion, 13.5 parts of butadiene derivative and 13.5 parts of α-methylstyrene.

[0069] The structural formula of polyacrylonitrile derivatives is as follows:

[0070]

[0071] Wherein, R1 is an ester group.

[0072] The structural formula of butadiene derivatives is as follows:

[0073]

[0074] Wherein, R2 is an ester group.

[0075] The preparation method of the lithium battery negative electrode binder specifically includes the following steps:

[0076] S1. Prepare each component acc...

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Abstract

The invention provides a lithium battery negative electrode binder and its preparation method and application. The lithium battery negative electrode binder is calculated in parts by mass, and the preparation raw materials include the following components: 40.0-55.0 parts of polyacrylonitrile compounds, 5.0-20.0 parts of butadiene compounds and 5.0-20.0 parts of styrene compounds; the polyacrylonitrile compounds are polyacrylonitrile and / or polyacrylonitrile derivatives, and the butadiene compounds is butadiene and / or butadiene derivatives, and the styrene compound is styrene and / or styrene derivatives. The preparation method of the binder includes an ultrasonic polymerization step and a homogeneous mixing step, and is easy to operate without adding initiator and plasticizer. The negative electrode sheet prepared by using the binder has the advantages of small impedance and not easy to break during processing, which further improves the safety performance of the lithium battery.

Description

technical field [0001] The invention belongs to the technical field of lithium battery processing, and in particular relates to a lithium battery negative electrode binder and a preparation method and application thereof. Background technique [0002] In recent years, with the vigorous development of the drone market, high-rate polymer lithium batteries have gradually become known to people. When the lithium battery is discharged at a high rate, due to the sharp rise in the surface temperature of the battery, an undercut will generally appear in the initial stage of the discharge curve. In order to solve this problem, the high-rate polymer lithium battery needs to reduce the impedance of the positive and negative plates as much as possible. The conductivity of the electrolyte can be increased under the condition of constant viscosity, and the porosity of the separator can also be appropriately increased to make the lithium battery discharge. Polarization in the process is m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M4/621H01M10/0525Y02E60/10
Inventor 程琛王满邱云珍麦敬辉刘长昊
Owner FULLYMAX BATTERY CO LTD
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