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Synthesis method of lithium battery binder carboxymethyl cellulose salt

A technology of carboxymethyl cellulose and sodium carboxymethyl cellulose, which is applied in the direction of battery electrodes, circuits, structural parts, etc., can solve the problems of difficult etherification production, insufficient flexibility of alkali fibers, and low elongation at break. Achieve the effects of extremely low residue, complete cellulose reaction and stable product quality

Active Publication Date: 2020-07-17
眉山晶瑞电子材料有限公司
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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 how to solve the problem that the elongation at break is low in the existing kneader technology in the background technology, the flexibility is insufficient and the one-step method that directly adopts lithium hydroxide as an alkalizing agent is difficult to form alkali fiber and is difficult to etherify to produce CMCLi

Method used

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  • Synthesis method of lithium battery binder carboxymethyl cellulose salt
  • Synthesis method of lithium battery binder carboxymethyl cellulose salt
  • Synthesis method of lithium battery binder carboxymethyl cellulose salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In a vertical 5L reactor (vertical reactor), add 220g of cotton, then add 600ml of 10% sodium hydroxide solution and 36g of lithium hydroxide solid, add 2500ml of solvent ethanol, add 89.7ml of chloroacetic acid, React at low temperature for 180 minutes, then raise the temperature to 60°C and react for 180 minutes. After the reaction is over, lower the temperature to 25°C and start centrifuging to discharge the material. After washing, drying, crushing, and screening, the finished product is bagged.

Embodiment 2

[0045] In the vertical 5L reactor (vertical reactor), add cotton 220g, then add 10% sodium hydroxide solution 720ml and lithium hydroxide solid 33.6g, add solvent ethanol 2500ml, add chloroacetic acid 107.6ml, first in 20 React at ℃ for 180min, then raise the temperature to 60℃ and react for 180min, when the reaction is over, lower the temperature to 25℃, start centrifugal discharge, wash, dry, pulverize, sieve, and get the finished product for bagging.

Embodiment 3

[0047] In the vertical 5L reactor (vertical reactor), add cotton 220g, then add 20% sodium hydroxide solution 240ml and lithium hydroxide solid 38.4g, add solvent ethanol 2500ml, add chloroacetic acid 107.6ml, first in 20 React at ℃ for 150 minutes, then raise the temperature to 70℃ and react for 150 minutes. After the reaction is over, lower the temperature to 30℃ and start centrifuging to discharge the material. After washing, drying, crushing and sieving, the finished product is bagged.

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Abstract

The invention belongs to the field of natural polymer chemical modification, and discloses a synthesis method of a lithium battery binder carboxymethyl cellulose salt. Raw materials such as cotton orcellulose powder, 10%-40% of a sodium hydroxide solution and lithium hydroxide a solvent and chloroacetic acid and the lick are subjected to strict condition control in a reaction kettle, so that a mixture product of sodium carboxymethyl cellulose and lithium carboxymethyl cellulose is prepared, and the ratio of sodium carboxymethyl cellulose to lithium carboxymethyl cellulose randomly ranges from10% to 90%. A slurry method is adopted for preparation, so the product flexibility is better, substituent distribution more uniform; in the pulping and coating process of the lithium battery, the flexibility of the binder is improved, the processability of the electrode plate is better, and a certain amount of lithium ions are doped in the binder, so that the total amount of the lithium ions in the whole lithium battery system can be additionally increased, the electrochemical performance of the lithium battery is improved, and the performances are incomparable better to those of sodium carboxymethyl cellulose produced by a kneading machine method.

Description

technical field [0001] The invention relates to the field of chemical modification of natural macromolecules, in particular to a new synthesis method of carboxymethyl cellulose salt, a lithium battery binder. Background technique [0002] Carboxymethylcellulose salt (sodium carboxymethylcellulose CMC, lithium carboxymethylcellulose CMC-Li, ammonium carboxymethylcellulose CMC-NH 4 etc.) can be used as aqueous binder materials in Li-ion batteries. Traditional water-based binders usually use sodium carboxymethylcellulose (CMC or CMC-Na) to disperse, suspend, and pulp anode materials, but in the current production process of CMC-Na for lithium batteries, mainly use The kneader method with low liquor ratio (solvent: cellulose<4:1) uses cotton or cellulose powder as raw material, and adds sodium hydroxide solution for alkalization. Due to the high solubility and high alkalinity of sodium hydroxide, the resulting Alkali cellulose is better, and it is easy to produce CMC-Na by ...

Claims

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Application Information

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IPC IPC(8): C08B11/12C08B1/08H01M4/62
CPCC08B11/12C08B1/08H01M4/622Y02E60/10
Inventor 于倩邱磊
Owner 眉山晶瑞电子材料有限公司
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