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Preparation method of lithium carboxymethyl cellulose for lithium battery

A technology of carboxymethyl cellulose and sodium carboxymethyl cellulose, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of high price and environmental pollution of lithium-ion battery binders, and achieve low price and high efficiency. Cycle stability, discharge capacity, and high purity

Inactive Publication Date: 2011-10-05
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of carboxymethylcellulose lithium for lithium batteries in order to solve the problems of lithium ion battery binders such as environmental pollution and high price

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of carboxymethyl cellulose acid (CMC-H): The performance indicators of the slurry method are: the degree of substitution measured by the conductivity method is DS=1.45, the viscosity of 2% aqueous solution measured by the Brookfield viscometer is 120cP, and the purity 98.3% sodium carboxymethyl cellulose sodium carboxymethyl cellulose. Disperse 50g of sodium carboxymethylcellulose in 95% ethanol water system, the bath ratio is 15:1, add 111.6g of HCl aqueous solution with a mass concentration of 18%; react at 30°C for 2h, filter and deliquify to obtain carboxy methylcellulose acid. Then wash with ethanol with a concentration of 95%; filter and deliquify, dry, and pulverize for use;

[0026] (2) Preparation of carboxymethylcellulose lithium (CMC-Li): disperse 37g CMC-H in 95% ethanol water system, the bath ratio is 12:1, add 149.3g mass fraction of 12% LiOH·H 2 O aqueous solution, LiOH·H 2 The molar ratio of O to CMC-H is 2:1; the above mixed solution ...

Embodiment 2

[0029] (1) Preparation of carboxymethyl cellulose acid (CMC-H): The performance indicators of the slurry method are: the degree of substitution measured by the conductivity method is DS=1.12, the viscosity of 2% aqueous solution measured by the Brookfield viscometer is 550cP, and the purity 98.5% sodium carboxymethylcellulose. Disperse 50 g of sodium carboxymethylcellulose in 93% isopropanol water system, the bath ratio is 14:1, add 93 g of HCl aqueous solution with a mass concentration of 20%; maintain the temperature at 20 ° C for 3 h, centrifuge and deliquify, The obtained carboxymethyl cellulose acid is washed with 90% isopropanol; centrifuged, dried, and pulverized for use;

[0030] (2) Preparation of carboxymethylcellulose lithium (CMC-Li): disperse 29.5g CMC-H in 93% isopropanol water system, the bath ratio is 15:1, add 138.7g mass fraction of 7% LiOH ·H 2 O aqueous solution, LiOH·H 2 The molar ratio of O to CMC-H is 2:1; the above mixed solution was reacted at 40°C ...

Embodiment 3

[0033] (1) Preparation of carboxymethyl cellulose acid (CMC-H): The performance indicators of the slurry method are: the degree of substitution measured by the conductivity method is DS=0.95, the viscosity of 2% aqueous solution measured by the Brookfield viscometer is 1900cP, and the purity 98.8% sodium carboxymethylcellulose. Disperse 50 g of sodium carboxymethyl cellulose in 95% acetone-water system with a bath ratio of 12:1, add 83.7 g of HCl aqueous solution with a mass concentration of 25%; maintain the temperature at 35° C. for 2 h, and centrifuge to obtain The carboxymethyl cellulose acid is washed with methanol at a concentration of 85%; filtered to remove liquid, dried, and pulverized for later use;

[0034] (2) Preparation of carboxymethylcellulose lithium (CMC-Li): Disperse 41g of CMC-H in 95% acetone water system with a liquor ratio of 12:1, add 113.1g of 8% LiOH·H 2 O aqueous solution, LiOH·H 2 The molar ratio of O to CMC-H is 2:1; the above mixture was reacted...

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Abstract

The invention relates to a preparation method of lithium carboxymethyl cellulose for a lithium battery, belonging to the field of natural high-polymer chemical modification. The preparation method provided by the invention comprises the following steps: dispersing sodium carboxymethyl cellulose prepared by a slurry process into an organic solvent, adding a hydrochloric acid water solution, mixing, reacting at 20-50 DEG C, removing the liquid, washing with an 80-95 vol% organic solvent, removing the liquid, baking, and pulverizing to obtain carboxymethyl cellulose acid; and dispersing the carboxymethyl cellulose acid in an organic solvent, adding an LiOH.H2O water solution, reacting at 40-60 DEG C, neutralizing with glacial acetic acid until the pH value is 6-8, washing with a 75-85% organic solvent, removing the liquid, baking, and pulverizing to obtain the lithium carboxymethyl cellulose. The preparation method can be used for obtaining lithium carboxymethyl cellulose with different degrees of substitution, different viscosities and excellent water solubility, and provides a novel water-soluble binder with low price and excellent properties, thereby enhancing the cyclical stability and discharge capacity of the lithium battery.

Description

technical field [0001] The invention relates to a preparation method of carboxymethyl cellulose lithium for lithium batteries, belonging to the field of chemical modification of natural polymers. Background technique [0002] With the increasing shortage of chemical fuel resources worldwide, people are forced to look for new alternative clean energy sources. Batteries have become an ideal alternative energy source due to their convenient use, low price, light weight, long cycle storage life, stable working voltage, and benefits to the environment. In chemical batteries, lithium (ion) batteries have incomparable advantages over traditional lead-acid, nickel-cadmium, and nickel-metal hydride batteries because lithium metal is the lightest of all metals, has the lowest oxidation-reduction potential, and has the largest mass energy density. [0003] Lithium-ion battery is a high-performance secondary battery, which has the advantages of high working voltage, high volume and wei...

Claims

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Application Information

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IPC IPC(8): C08B11/12H01M4/62
CPCY02E60/12Y02E60/10
Inventor 邵自强李友琦万君玲吕少一郭鸿雁陈静王飞俊王霞
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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