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Lignin-based aqueous adhesive applied to negative electrode of lithium ion battery, electrode plate based on adhesive and lithium ion battery

A lithium-ion battery, water-based binder technology, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of improving coating uniformity, improving high-rate performance, and reducing resistance

Active Publication Date: 2016-10-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, no studies have reported the use of water-soluble lignin for the dispersion and bonding of lithium-ion battery electrode materials.

Method used

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  • Lignin-based aqueous adhesive applied to negative electrode of lithium ion battery, electrode plate based on adhesive and lithium ion battery
  • Lignin-based aqueous adhesive applied to negative electrode of lithium ion battery, electrode plate based on adhesive and lithium ion battery
  • Lignin-based aqueous adhesive applied to negative electrode of lithium ion battery, electrode plate based on adhesive and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. Preparation of test electrodes:

[0043]The mass ratio of graphite, conductive carbon black (Super P) and lignin-based water-based binder is 85:6:9. The mass ratio of water-soluble lignin (sodium lignosulfonate) to SBR in the lignin-based water-based binder is 2:1. Add the water-soluble lignin in the lignin-based water-based binder to an appropriate amount of deionized water, and stir to fully dissolve it; add the conductive carbon black to the water-soluble lignin aqueous solution obtained in the previous step, and stir until it is uniformly dispersed; the graphite Add it to the mixture obtained in the previous step, and stir until uniformly dispersed; add the SBR in the lignin-based water-based binder to the mixture obtained in the previous step, and stir until uniformly dispersed to obtain an electrode slurry (solid content: 60%); The obtained electrode slurry is evenly coated on the Cu foil, dried in vacuum at 100° C., and rolled to obtain the graphite negative ...

Embodiment 2

[0055] 1. Preparation of test electrodes:

[0056] The difference between this example and Example 1 is that the test electrode also uses a lignin-based water-based binder as a binder, but uses activated carbon as an active material. The mass ratio of activated carbon, conductive carbon black (Super P) and lignin-based water-based binder is 75:15:10. The mass ratio of water-soluble lignin (a binary mixture of calcium lignosulfonate and sulfonated alkali lignin) to SBR in the lignin-based water-based binder is 3:1. Add the water-soluble lignin in the lignin-based water-based binder to an appropriate amount of deionized water, and stir to fully dissolve it; add conductive carbon black to the lignin aqueous solution obtained in the previous step, and stir until it is evenly dispersed; add activated carbon to the In the mixture obtained in the previous step, stir until uniformly dispersed; add the SBR in the lignin-based water-based binder to the mixture obtained in the previous ...

Embodiment 3

[0062] 1. Preparation of test electrodes:

[0063] The difference between this example and Example 1 is that the test electrode also uses a lignin-based water-based binder as a binder, but uses mesocarbon microspheres as an active material. The mass ratio of mesophase carbon microspheres, conductive carbon black (Super P) and lignin-based water-based binder is 80:10:10. The mass ratio of water-soluble lignin (a ternary mixture of sodium lignosulfonate, sulfonated enzymatic lignin and carboxylated alkali lignin) to SBR in the lignin-based water-based binder was 1:3. Add the water-soluble lignin in the lignin-based water-based binder to an appropriate amount of deionization, and stir to fully dissolve it; add conductive carbon black to the lignin aqueous solution obtained in the previous step, and stir until it is evenly dispersed; the mesophase carbon Add the microspheres to the mixture obtained in the previous step, and stir until uniformly dispersed; add the SBR in the ligni...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses a lignin-based aqueous adhesive applied to a negative electrode of a lithium ion battery, an electrode plate based on the adhesive and a lithium ion battery. The lignin-based aqueous adhesive comprises the following components in parts by weight: 100 parts of water-soluble lignin, and 20-1,000 parts of butadiene styrene rubber. The invention further provides an electrode plate of the negative electrode of the lithium ion battery based on the adhesive and the lithium ion battery thereof. The lignin-based aqueous adhesive is applied to the negative electrode of the lithium ion battery, so that the dispersity and the binding power of an electrode material is improved, agglomeration of active materials is effectively overcome, the uniformity of coating electrode slurry on a Cu foil is improved, the toughness of the electrode material is good, interface impedance can be reduced, the resistance of the negative electrode plate is reduced, and the high rate performance of the material is greatly improved; in the other aspect, the lignin provided by the invention is widely from natural plants, and therefore, is green and environment-friendly, and when the lignin is applied to the aqueous adhesive, the costs of batteries can be remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lignin-based water-based binder for lithium-ion battery negative electrodes, lithium-ion battery negative electrode sheets and lithium-ion batteries based thereon. Background technique [0002] Although the binder is an inactive component in lithium-ion battery electrode sheets, it is one of the important materials that must be used in the preparation of lithium-ion battery electrode sheets. In the electrode, the binder not only plays the role of bonding between the active material layers, but also serves as the bonding between the active material layer and the current collector. In addition to cohesiveness, binders need to be flexible, insoluble in electrolytes, dense, chemically and electrochemically stable, and easy to coat electrodes. Adding an optimal amount of binder can obtain larger capacity, longer cycle life and lower internal resistance, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525H01M4/139
CPCH01M4/139H01M4/621H01M10/0525Y02E60/10
Inventor 邱学青熊文龙杨东杰李常青邓永红钱勇易聪华黄锦浩
Owner SOUTH CHINA UNIV OF TECH
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