Convenient method for preparing binder-free stannic oxide/carbon fibrofelt for negative pole of high-performance lithium ion battery

Abstract

The invention discloses a convenient method for preparing binder-free stannic oxide / carbon fibrofelt for a negative pole of a high-performance lithium ion battery. The method disclosed by the invention comprises the following steps: dissolving polyacrylonitrile and stannous chloride which have certain concentrations to a N'N-dimethyl formamide solution, magnetically stirring the solution of polyacrylonitrile, the stannous chloride and the N'N-dimethyl formamide solution until the solution is clarified, electrostatically spinning the solution, and finally annealing the obtained solution which is obtained at a high temperature twice to obtain Sn-SnOx uniformly loaded nanometer composite materials of the carbon fibrofelt. For a compound which is prepared by the method disclosed by the invention, since the electrostatic spinning method is adopted, nanometer particles of metal-metallic oxide are uniformly dispersed into buffer substrate carbon fiber, and the circulation specific capacity and the stability of materials for the negative pole of the lithium ion battery are effectively improved. The preparation technology disclosed by the invention has the advantages that the operation is simple, the cost is low, the efficiency is high, the large-scale and industrial production is easy to realize, and the application range is broad.

Description

technical field

[0001] The invention relates to the technical field of preparation of lithium-ion battery negative electrode materials, in particular to a method for preparing tin-based / carbon fiber mat high-performance lithium-ion battery negative electrode materials without binders by an electrospinning method. Background technique

[0002] With the rapid development of information technology, a variety of portable electronic products have emerged. Lithium-ion batteries have become the preferred power source for various electronic products due to their advantages such as high voltage, high specific energy, long life, and low pollution. At the same time, lithium-ion batteries also have good application prospects and development space in the fields of national defense industry, space technology, and electric vehicles. At present, commercial lithium-ion batteries mainly use carbon materials as negative electrode active materials. Scientific researchers have done a lot of res...

Examples

Embodiment 1

[0022] First take the GO suspension; then take PAN (polyacrylonitrile), dihydrate tin dichloride dissolved in DMF, the concentration is 6.5% and 2.5% respectively, and mix the graphene oxide suspension as the precursor solution; the precursor solution At 60°C, stir magnetically until the mixture turns into a clear solution, and the color changes from transparent light brown to black (graphene color); the precursor solution is transferred to a 10ml syringe with a 0.7mm inner diameter stainless steel needle, and the syringe pump Control the flow rate of the precursor solution, which is about 0.1-0.8ML / h; the aluminum foil heat sink is used as the collecting plate, the needle is perpendicular to the collecting plate, and the distance is 8-15cm, and the DC high voltage source is selected as a high voltage of 8-15KV; Dry in a vacuum oven at 80°C overnight, pre-oxidize in air at 230°C for 4 hours (1°C / min), then cut into pieces, and then carbonize in argon at 700°C (5°C / min) for 2 ho...

Embodiment 2

[0025] First take the GO suspension; then take PAN (polyacrylonitrile), dihydrate tin dichloride dissolved in DMF, the concentration is 5.5% and 1.5% respectively, and mix the graphene oxide suspension as the precursor solution; the precursor solution At 60°C, stir magnetically until the mixture turns into a clear solution, and the color changes from transparent light brown to black (graphene color); the precursor solution is transferred to a 10ml syringe with a 0.7mm inner diameter stainless steel needle, and the syringe pump Control the flow rate of the precursor solution, which is about 0.1-0.8mL / h; the aluminum foil heat sink is used as the collecting plate, the needle is perpendicular to the collecting plate, and the distance is 8-15cm, and the DC high voltage source is selected as a high voltage of 8-15KV; Dry in a vacuum oven at 80°C overnight, pre-oxidize in air at 220°C for 4 hours (1°C / min), then cut into pieces, and then carbonize at 600°C (5°C / min) in argon for 2 ho...

Embodiment 3

[0028] First take the GO suspension; then take PAN (polyacrylonitrile), dihydrate tin dichloride dissolved in DMF, the concentration is 7.5% and 1.5%, respectively, mixed graphene oxide suspension, as the precursor solution; the precursor solution At 60°C, stir magnetically until the mixture turns into a clear solution, and the color changes from transparent light brown to black (graphene color); the precursor solution is transferred to a 10ml syringe with a 0.7mm inner diameter stainless steel needle, and the syringe pump Control the flow rate of the precursor solution, which is about 0.1-0.8mL / h; the aluminum foil heat sink is used as the collecting plate, the needle is perpendicular to the collecting plate, and the distance is 8-15cm, and the DC high voltage source is selected as a high voltage of 8-15KV; Dry in a vacuum oven at 80°C overnight, pre-oxidize in air at 210°C for 4 hours (1°C / min), then cut into pieces, and then carbonize at 500°C (5°C / min) in argon for 2 hours....

technical field

[0001] The invention relates to the technical field of preparation of lithium-ion battery negative electrode materials, in particular to a method for preparing tin-based / carbon fiber mat high-performance lithium-ion battery negative electrode materials without binders by an electrospinning method. Background technique

[0002] With the rapid development of information technology, a variety of portable electronic products have emerged. Lithium-ion batteries have become the preferred power source for various electronic products due to their advantages such as high voltage, high specific energy, long life, and low pollution. At the same time, lithium-ion batteries also have good application prospects and development space in the fields of national defense industry, space technology, and electric vehicles. At present, commercial lithium-ion batteries mainly use carbon materials as negative electrode active materials. Scientific researchers have done a lot of res...

Examples

Embodiment 1

[0022] First take the GO suspension; then take PAN (polyacrylonitrile), dihydrate tin dichloride dissolved in DMF, the concentration is 6.5% and 2.5% respectively, and mix the graphene oxide suspension as the precursor solution; the precursor solution At 60°C, stir magnetically until the mixture turns into a clear solution, and the color changes from transparent light brown to black (graphene color); the precursor solution is transferred to a 10ml syringe with a 0.7mm inner diameter stainless steel needle, and the syringe pump Control the flow rate of the precursor solution, which is about 0.1-0.8ML / h; the aluminum foil heat sink is used as the collecting plate, the needle is perpendicular to the collecting plate, and the distance is 8-15cm, and the DC high voltage source is selected as a high voltage of 8-15KV; Dry in a vacuum oven at 80°C overnight, pre-oxidize in air at 230°C for 4 hours (1°C / min), then cut into pieces, and then carbonize in argon at 700°C (5°C / min) for 2 ho...

Embodiment 2

[0025] First take the GO suspension; then take PAN (polyacrylonitrile), dihydrate tin dichloride dissolved in DMF, the concentration is 5.5% and 1.5% respectively, and mix the graphene oxide suspension as the precursor solution; the precursor solution At 60°C, stir magnetically until the mixture turns into a clear solution, and the color changes from transparent light brown to black (graphene color); the precursor solution is transferred to a 10ml syringe with a 0.7mm inner diameter stainless steel needle, and the syringe pump Control the flow rate of the precursor solution, which is about 0.1-0.8mL / h; the aluminum foil heat sink is used as the collecting plate, the needle is perpendicular to the collecting plate, and the distance is 8-15cm, and the DC high voltage source is selected as a high voltage of 8-15KV; Dry in a vacuum oven at 80°C overnight, pre-oxidize in air at 220°C for 4 hours (1°C / min), then cut into pieces, and then carbonize at 600°C (5°C / min) in argon for 2 ho...

Embodiment 3

[0028] First take the GO suspension; then take PAN (polyacrylonitrile), dihydrate tin dichloride dissolved in DMF, the concentration is 7.5% and 1.5%, respectively, mixed graphene oxide suspension, as the precursor solution; the precursor solution At 60°C, stir magnetically until the mixture turns into a clear solution, and the color changes from transparent light brown to black (graphene color); the precursor solution is transferred to a 10ml syringe with a 0.7mm inner diameter stainless steel needle, and the syringe pump Control the flow rate of the precursor solution, which is about 0.1-0.8mL / h; the aluminum foil heat sink is used as the collecting plate, the needle is perpendicular to the collecting plate, and the distance is 8-15cm, and the DC high voltage source is selected as a high voltage of 8-15KV; Dry in a vacuum oven at 80°C overnight, pre-oxidize in air at 210°C for 4 hours (1°C / min), then cut into pieces, and then carbonize at 500°C (5°C / min) in argon for 2 hours....

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