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Lithium-ion battery negative electrode slurry and lithium-ion battery

A lithium-ion battery, negative electrode slurry technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as abnormal coating and difficult batching, reduce slurry viscosity, improve contact interface, and reduce dispersion. effect of time

Active Publication Date: 2019-12-17
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lithium ion battery negative electrode slurry and a lithium ion battery that can improve the matching between the thickener and the binder or the thickener and the active material, thereby solving the problems of difficult ingredients and abnormal coating

Method used

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  • Lithium-ion battery negative electrode slurry and lithium-ion battery
  • Lithium-ion battery negative electrode slurry and lithium-ion battery
  • Lithium-ion battery negative electrode slurry and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Prepare the negative electrode sheet: configure the negative electrode active material, conductive agent, thickener, binder, and silicone polymer into the negative electrode slurry in the following mass percentages: 97.8%: 0.5%: 0.5%: 1.0%: 0.2%, This ratio is the ratio of dry material mass, and the negative electrode active material of the present embodiment is artificial graphite, and conductive agent is conductive carbon black (Super P), and thickener is sodium carboxymethyl cellulose, and binding agent is water emulsion Styrene rubber (SBR), the silicone polymer is a methoxy polyether-modified silicone polymer containing a nitrile group;

[0044] Add deionized water and methoxy polyether-modified silicone polymer containing nitrile group to the double planetary mixer, add the ground conductive agent during the stirring process, and disperse for 20 minutes; first add 0.2% sodium carboxymethyl cellulose , stirred for 20 minutes; after mixing evenly, add graphite, thic...

Embodiment 2

[0056] The difference between this example and Example 1 is that the organosilicon polymer is a polyether-modified organosilicon polymer containing phenyl-terminated methoxy groups, and the ratio of the materials and the stirring process remain unchanged to prepare the negative electrode slurry; The negative electrode slurry is coated on the negative electrode current collector to prepare the negative electrode sheet. The positive electrode sheet and separator are the same as in Example 1.

[0057] The negative electrode sheet prepared in this example was processed by a roller press, and the compacted density of the active material layer was 1.73 g / cm 3 .

Embodiment 3

[0059] The difference between this example and Example 1 is that the silicone polymer is a modified silicone polymer containing epoxy-terminated methoxy polyether, and the ratio of materials and the stirring process remain unchanged to prepare the negative electrode slurry; The negative electrode slurry is coated on the negative electrode current collector to prepare the negative electrode sheet. The positive electrode sheet and separator are the same as in Example 1.

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Abstract

Negative electrode paste of a lithium ion battery is formed by stirring a negative electrode material and a solvent, the negative electrode material comprises a negative electrode active substance, a conductive agent, a thickening agent and a binding agent and also comprises a polyether modified organic silicon polymer, the polyether modified organic silicon polymer accounts for 0.2-0.5% of the total weight of the negative electrode material, and the mass ratio of the polyether modified organic silicon polymer to the thickening agent is 1:(1.5-3). An organic silicon polymer is introduced into a negative electrode paste formula system so as to improve paste stability; the addition quantity of the water-soluble thickening agent is reduced, so that the energy density of the lithium ion battery is improved; and meanwhile, due to the flexibility of a Si-C structure in the organic silicon polymer, the compaction density of a pole plate is improved, the negative electrode paste is good in high-temperature resistant performance, the high-temperature cycle property and the high-temperature storage performance of various materials can be improved, and the problems of ingredient preparation difficulty, coating abnormality and the like caused by poor matching of main materials such as the water-soluble thickening agent and the water-based binding agent or the water-soluble thickening agent and graphite can also be remarkably solved.

Description

technical field [0001] The invention belongs to the technical field of polymer lithium ion batteries, and in particular relates to a lithium ion negative electrode slurry containing an organosilicon polymer and a lithium ion battery. Background technique [0002] In recent years, with the continuous expansion of the industrial scale of lithium-ion batteries and the continuous development of related technologies, lithium-ion batteries have become energy storage devices for mainstream electronic products, and the uses of lithium-ion batteries have been greatly expanded. At the same time, people's performance requirements for lithium-ion batteries have also been further improved, especially the high energy density and long cycle life of lithium-ion batteries. [0003] As people have higher and higher requirements for the lightness and portability of mobile electronic and electrical equipment, correspondingly, higher requirements have been put forward for the high capacity of li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/62
CPCH01M4/13H01M4/62H01M4/621H01M4/624Y02E60/10
Inventor 李俊义付东兴徐延铭李素丽刘春洋
Owner ZHUHAI COSMX BATTERY CO LTD
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