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
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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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