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A kind of composite binder and its preparation method and application

A binder and compound technology, applied in the field of composite binder and its preparation, to achieve the effects of low binder impedance, increased energy density, and strong ion transmission

Active Publication Date: 2022-04-01
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above solutions all have the problem of energy density and low-temperature cycle performance of the battery that need to be further improved.

Method used

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  • A kind of composite binder and its preparation method and application
  • A kind of composite binder and its preparation method and application
  • A kind of composite binder and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a composite binder, which is composed of styrene-butadiene rubber, acrylonitrile copolymer (LA type binder LA133) and sodium carboxymethyl cellulose. Wherein, the mass ratio of styrene-butadiene rubber to acrylonitrile copolymer is 6:25, and the mass fraction of sodium carboxymethyl cellulose in the composite binder is 8.8%.

[0051] This embodiment also provides a negative electrode sheet, which includes a copper foil current collector and a negative electrode coating coated on the current collector. The negative electrode coating is composed of the composite binder and conductive agent (SP) provided by this embodiment. ) and the negative active material. The negative electrode active material is composed of graphite negative electrode material and silicon-oxygen material, and the mass fraction of silicon-oxygen material in the negative electrode active material is 5%.

[0052] In the negative electrode coating, the mass fraction of the compos...

Embodiment 2

[0057] This embodiment provides a composite binder, which is composed of styrene-butadiene rubber, acrylonitrile copolymer (LA type binder LA133) and sodium carboxymethyl cellulose. Wherein, the mass ratio of styrene-butadiene rubber to acrylonitrile copolymer is 1:3.5, and the mass fraction of sodium carboxymethyl cellulose in the composite binder is 8%.

[0058] This embodiment also provides a negative electrode sheet, which includes a copper foil current collector and a negative electrode coating coated on the current collector. The negative electrode coating is composed of the composite binder and conductive agent (SP) provided by this embodiment. ) and the negative active material. The negative electrode active material is composed of graphite negative electrode material and silicon-oxygen material, and the mass fraction of silicon-oxygen material in the negative electrode active material is 4.8%.

[0059] In the negative electrode coating, the mass fraction of the compo...

Embodiment 3

[0062] This embodiment provides a composite binder, which is composed of styrene-butadiene rubber, acrylonitrile copolymer (LA type binder LA133) and sodium carboxymethyl cellulose. Wherein, the mass ratio of styrene-butadiene rubber to acrylonitrile copolymer is 1:4.5, and the mass fraction of sodium carboxymethyl cellulose in the composite binder is 10%.

[0063] This embodiment also provides a negative electrode sheet, which includes a copper foil current collector and a negative electrode coating coated on the current collector. The negative electrode coating is composed of the composite binder and conductive agent (SP) provided by this embodiment. ) and the negative active material. The negative electrode active material is composed of graphite negative electrode material and silicon-oxygen material, and the mass fraction of silicon-oxygen material in the negative electrode active material is 4.9%.

[0064] In the negative electrode coating, the mass fraction of the comp...

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Abstract

The invention provides a composite binder and its preparation method and application. The binder includes rubber and nitrile compounds, and the mass ratio of the rubber to nitrile compounds is 1:2-1:10. The negative electrode sheet includes a current collector and a negative electrode coating coated on the current collector, the negative electrode coating includes the composite binder, a conductive agent and a negative active material, and the negative active material includes a silicon oxide material . The composite binder provided by the invention is especially suitable for the silicon-oxygen system, and can significantly improve the low-temperature cycle performance of the battery while increasing the energy density.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a binder and its preparation method and application, in particular to a composite binder and its preparation method and application. Background technique [0002] With the development of the battery industry, the energy density of the battery cell is required to increase. Due to the obvious advantages of high gram capacity, silicon-oxygen materials (SiOx, where 0<x<2) have been added to negative electrode graphite as additives in small amounts to increase the energy density of the battery cell. Provide ideas; however, the dynamic performance of silicon-oxygen materials is significantly worse in low-temperature environments, so adding a small amount of silicon-oxygen materials will also make the low-temperature performance of the battery worse, and lithium will be precipitated during low-temperature cycling. [0003] Traditional lithium-ion battery negative electrodes often ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/04H01M10/0525
CPCH01M4/622H01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/0404H01M10/0525Y02E60/10
Inventor 刘颖支岩辉姚洋洋窦洋娄帅宾
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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