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Negative electrode dispersing agent and lithium ion battery containing dispersing agent

A dispersant and molecular weight technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problem of low viscosity of negative electrode dispersant

Pending Publication Date: 2021-06-29
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the problem that the viscosity of the existing negative electrode dispersant is not high, the invention provides a negative electrode dispersant and a lithium ion battery containing the dispersant, the lithium ion battery includes a positive electrode sheet and a negative electrode sheet, and the negative electrode sheet is obtained by Prepared by the method of coating the negative electrode slurry on the surface of the negative electrode current collector

Method used

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  • Negative electrode dispersing agent and lithium ion battery containing dispersing agent
  • Negative electrode dispersing agent and lithium ion battery containing dispersing agent
  • Negative electrode dispersing agent and lithium ion battery containing dispersing agent

Examples

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preparation example Construction

[0088] [Preparation method of dispersant]

[0089] The present invention also provides the preparation method of above-mentioned dispersant, described method comprises the steps:

[0090] (1) sodium carboxymethyl cellulose is dissolved in a solvent to obtain a uniform sodium carboxymethyl cellulose solution;

[0091] (2) in the sodium carboxymethyl cellulose solution of step (1), add the first pH regulator, react, obtain the sodium carboxymethyl cellulose solution of hydroxyl protonation;

[0092] (3) continue to add the compound shown in formula a, react, add the second pH adjuster to prepare the dispersant; or,

[0093] (1) sodium carboxymethyl cellulose is dissolved in a solvent to obtain a uniform sodium carboxymethyl cellulose solution;

[0094] (2') in the sodium carboxymethyl cellulose solution of step (1), add the second pH regulator, react, obtain the sodium carboxymethyl cellulose solution of hydroxyl deprotonation;

[0095] (3') continue to add at least one of th...

Embodiment approach

[0147] According to an embodiment of the present invention, the preparation method of the negative electrode sheet includes the following steps:

[0148] (1) Negative electrode active material, conductive agent, binding agent and above-mentioned dispersant are mixed uniformly, obtain negative electrode slurry;

[0149] (2) Coating the negative electrode slurry on the surface of the negative electrode current collector, and obtaining the negative electrode sheet after baking.

[0150] [Application of Negative Electrode]

[0151] The present invention also provides the application of the above-mentioned negative electrode sheet in a lithium ion battery.

[0152] [Lithium Ion Battery]

[0153] As mentioned above, the present invention provides a lithium-ion battery, which includes the above-mentioned negative electrode sheet.

[0154] According to an embodiment of the present invention, the lithium ion battery further includes a positive pole piece, a separator and an electrol...

Embodiment 1

[0171] Preparation of cross-linked CMC:

[0172] 1) Weigh 10 parts by mass of CMC (1) with a degree of substitution of 0.82, add it to a reaction flask, then add 250 parts by mass of deionized water, and mechanically stir for 4 hours at a rotation speed of 500 rpm to obtain a uniform CMC solution;

[0173] 2) Add 0.1mol / L hydrochloric acid to the above CMC solution, adjust the pH to 5, stir at 500rpm, and react at 25°C for 1h to obtain the CMC solution;

[0174] 3) Add 0.02 parts by mass of glutaraldehyde to the CMC solution in step 2), stir, react at 40°C for 3 hours, then lower to room temperature, add 0.5mol / L sodium carbonate to adjust the pH to 7, and obtain a cross-linked CMC solution;

[0175] 4) Add 400 parts by mass of ethanol to the cross-linked CMC solution obtained in step 3 to separate out the modified CMC molecules, filter with suction, and dry the filter cake at 60° C. for 12 hours in a blast drying oven, and then in a vacuum drying oven for 50 Dry at ℃ for 10 ...

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Abstract

The invention belongs to the field of lithium ion batteries, particularly belongs to the technical field of dispersing agents for lithium ion batteries, and particularly relates to a negative electrode dispersing agent and a lithium ion battery containing the dispersing agent. Conventional CMC contains abundant hydroxyl groups and a small amount of carboxyl groups, and has certain solubility in water. According to the invention, hydroxyl groups on CMC react with some bifunctional organic matters which react with the hydroxyl groups, so linear CMC becomes CMC with a three-dimensional network structure, and the viscosity of the CMC in water is improved. Compared with CMC before modification, the high-viscosity CMC glue solution obtained by dissolving in water is not changed in dispersing performance when being used in the lithium ion battery, and is reduced in use amount; namely, the proportion of active substances can be increased, and the energy density of the lithium ion battery can be improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to the technical field of dispersants for lithium ion batteries, in particular to a negative electrode dispersant and a lithium ion battery containing the dispersant. Background technique [0002] Lithium-ion batteries have high energy density, high working voltage, environmental friendliness, and strong manufacturability, and are currently widely used in mobile phones, notebook computers, electric vehicles, and energy storage fields. With the acceleration of people's life rhythm and the popularization of intelligent communication equipment such as mobile phones, the demand for high energy density batteries is increasing. In the preparation process of the negative electrode slurry, sodium carboxymethylcellulose (CMC) usually needs to be added as a dispersant, which can thicken and stabilize the slurry to prevent the negative electrode active material from settling. In the actua...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08L1/28C08K5/07H01M4/62H01M10/0525
CPCC08J3/24H01M4/622H01M10/0525C08J2301/28C08K5/07Y02E60/10
Inventor 储霖郭盼龙陈伟平李素丽李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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