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Sodium carboxymethyl cellulose and preparation method thereof, and battery negative electrode slurry and preparation method thereof

A technology of sodium carboxymethyl cellulose and negative electrode slurry, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems such as scratches, affecting battery safety, blocking filter elements, etc., achieves stable coating surface density and saves production cost, effect of rapid viscosity release

Active Publication Date: 2022-04-05
CHONGQING LIHONG FINE CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the invention provides a kind of sodium carboxymethylcellulose and its preparation method and a kind of battery negative electrode slurry and its preparation method, can effectively solve The existing instant sodium carboxymethyl cellulose contains a lot of insoluble matter, and it is easy to block the filter element during the preparation of the negative electrode slurry, scratches appear during the coating process, and the density of the coating surface is unstable, which ultimately affects the battery life. core performance, and even affect technical issues such as battery safety

Method used

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  • Sodium carboxymethyl cellulose and preparation method thereof, and battery negative electrode slurry and preparation method thereof

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preparation example Construction

[0024] The invention provides a kind of preparation method of sodium carboxymethyl cellulose, comprising the following steps:

[0025] The crude product of sodium carboxymethyl cellulose is obtained through alkalization and etherification of natural cellulose in sequence, and sodium carboxymethyl cellulose is prepared through the processes of neutralization, washing, stripping, drying and pulverization in sequence;

[0026] Among them, in one or more processes of neutralization, washing, steam stripping, drying, and pulverization, or in sodium carboxymethyl cellulose, fast solvent is added for reaction; preferably in the three processes of neutralization, washing, and steam stripping Add fast solvent to carry out the reaction.

[0027] Preferably, in parts by weight, alkalization: 1 part of cellulose, 0.7-3 parts of liquid caustic soda and 1-10 parts of alcohol mixture in a reaction kettle, alkalized at 10-55°C for 0.5-3 hours to form alkali fibers white.

[0028] Etherifica...

Embodiment 1

[0050] In parts by weight, alkalization: 1 part of cellulose, 2 parts of potassium hydroxide solution and 7 parts of alcohol mixture in a reaction kettle, alkalized at 45 ° C for 2 hours to form alkali cellulose;

[0051] Etherification: Add 2 parts of the mixture of chloroacetic acid and alcohol after alkalization, and control the temperature at 40°C for 0.5 hours in the initial stage of etherification; in the middle stage of etherification, control the temperature at 50°C for 1 hour; in the later stage of etherification, the temperature Control at 70°C for 1 hour to obtain a crude product of sodium carboxymethylcellulose.

[0052] Neutralization: Add 80 parts of alcohol-water mixture to the crude product after the reaction, and stir for 1.5 hours, during which a pH regulator is added to neutralize the residual alkali.

[0053] Washing: The neutralized crude sodium carboxymethyl cellulose product is washed three times with a mixture of alcohol and water to remove reaction by-pr...

Embodiment 2

[0059] The processes of alkalization, etherification, neutralization, washing, stripping, drying and pulverization are the same as in Example 1.

[0060] The crude product of sodium carboxymethyl cellulose is obtained through alkalization and etherification of natural cellulose in sequence, and then sodium carboxymethyl cellulose is prepared through the processes of neutralization, washing, stripping, drying and pulverization in sequence. Among them, the first-stage fast solvent (oxalic acid) is added in the neutralization process to adjust the pH to neutral; the second-stage fast solvent (glyoxal and polyethylene oxide) is added during the stripping process.

[0061] Wherein, the first-stage fast solvent addition quality is 5% of the crude product of sodium carboxymethyl cellulose, and reacts at 30° C. for 20 min; the second-stage quick solvent addition quality is 14% of the crude product of sodium carboxymethyl cellulose, and (The mass ratio of glyoxal to polyethylene oxide ...

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Abstract

The invention belongs to the technical field of sodium carboxymethyl cellulose, and discloses a preparation method of sodium carboxymethyl cellulose, which comprises the following steps: alkalizing and etherifying natural cellulose in sequence to obtain a sodium carboxymethyl cellulose crude product, and then neutralizing, washing, stripping, drying and crushing in sequence to prepare the sodium carboxymethyl cellulose. Wherein in one or more processes of neutralization, washing, steam stripping, drying and crushing or in the sodium carboxymethyl cellulose, an accelerating solvent is added for reaction, and the prepared sodium carboxymethyl cellulose has the advantages of rapid dispersion and rapid viscosity release. The invention also discloses a battery negative electrode slurry which comprises the following components in parts by weight: 96-98 parts of graphite, 0.5-2 parts of conductive carbon ink, 0.6-2 parts of sodium carboxymethyl cellulose, 0.4-2 parts of styrene-butadiene latex and 90-150 parts of water, and the negative electrode slurry does not block a filter element in the preparation process, is free of scratches during coating and is stable in surface density.

Description

technical field [0001] The invention relates to the technical field of sodium carboxymethyl cellulose, and more specifically relates to sodium carboxymethyl cellulose and a preparation method thereof, and a battery negative electrode slurry and a preparation method thereof. Background technique [0002] With the increasing demand for new energy vehicles and energy storage, lithium-ion battery manufacturers have also begun to build new production lines to expand production capacity to meet market demand. Sodium carboxycellulose is used as a suspension stabilizer and binder in lithium-ion batteries to stabilize slurry, disperse active substances, and assist bonding. Sodium carboxymethyl cellulose is a hydrophilic polymer compound, and it is easy to form groups during the process of dissolving in water, forming large white "fish-eye-shaped" particles. Once such large particles are formed, it takes a long time to dissolve and disperse. Therefore, most of the negative electrode ...

Claims

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Application Information

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IPC IPC(8): C08B11/12H01M4/133H01M4/1393H01M4/62
CPCY02E60/10
Inventor 杜琨聂桢桢夏银凤李友琦周子来余庆郭禹辰
Owner CHONGQING LIHONG FINE CHEM
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