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Preparation method of cobalt oxide-modified carbon-doped tin-manganese composite oxide nanofibers

A composite oxide and nanofiber technology, applied in the field of material chemistry, can solve the problems of insufficient cycle times and unsatisfactory charge-discharge curves, reducing volume expansion effect, improving electrochemical performance, improving electrical conductivity and cycle performance. Effect

Active Publication Date: 2020-02-28
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the introduction of transition metals has greatly improved the charge and discharge capacity of the battery, there are still problems in application such as insufficient cycle times and unsatisfactory charge and discharge curves.

Method used

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  • Preparation method of cobalt oxide-modified carbon-doped tin-manganese composite oxide nanofibers
  • Preparation method of cobalt oxide-modified carbon-doped tin-manganese composite oxide nanofibers
  • Preparation method of cobalt oxide-modified carbon-doped tin-manganese composite oxide nanofibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 1.0mmol (0.245g) of manganese acetate tetrahydrate (Mn(CH 3 COO) 2 4H 2 O), 1.0mmol (0.351g) dibutyltin oxalate (C 12 h 24 o 4 Sn) was dissolved in 10mL of N,N-dimethylformamide (DMF), then 2.0g of PAN (polyacrylonitrile) was added and stirred for 5h to obtain a light yellow mixture solution precursor; the above light yellow mixture The solution precursor was electrospun at a voltage of 17kV, a flow rate of 0.8mL / h, and an atmosphere with a relative humidity of 30%; the electrospun product obtained above was dried at 120°C;

[0030] Weigh 1.0mmol (0.096g) of 1,2-dimethylimidazole and dissolve it in 10mL of methanol to make solution A; weigh 1.0mmol (0.249g) of cobalt acetate tetrahydrate and dissolve it in 10mL of methanol to make a solution B;

[0031] The dried electrospun product obtained above was soaked in a solution containing Co 2+ Take it out after 30 minutes in methanol solution B containing ions, then take it out after soaking in methanol solution...

Embodiment 2

[0034] Weigh 1.0mmol (0.245g) of manganese acetate tetrahydrate (Mn(CH 3 COO) 2 4H 2 O), 1.0mmol (0.351g) dibutyltin oxalate (C 12 h 24 o 4 Sn) was dissolved in 10mL of N,N-dimethylformamide (DMF), then 2.0g of PAN (polyacrylonitrile) was added and stirred for 5h to obtain a light yellow mixture solution precursor; the above light yellow mixture The solution precursor was electrospun at a voltage of 19kV, a flow rate of 1.0mL / h, and an atmosphere with a relative humidity of 45%; the electrospun product obtained above was dried at 120°C;

[0035] Weigh 1.0mmol (0.096g) of 1,2-dimethylimidazole and dissolve it in 10mL of methanol to make solution A; weigh 2.0mmol (0.498g) of cobalt acetate tetrahydrate and dissolve it in 10mL of methanol to make a solution B;

[0036] The dried electrospun product obtained above was soaked in a solution containing Co 2+ Take it out after 30 minutes in methanol solution B containing ions, then take it out after soaking in methanol solution...

Embodiment 3

[0038] Weigh 1.0mmol (0.245g) of manganese acetate tetrahydrate (Mn(CH 3 COO) 2· 4H 2 O), 1.0mmol (0.351g) dibutyltin oxalate (C 12 h 24 o 4 Sn) was dissolved in 10mL of N,N-dimethylformamide (DMF), then 2.0g of PAN (polyacrylonitrile) was added and stirred for 5h to obtain a light yellow mixture solution precursor; the above light yellow mixture The solution precursor was electrospun at a voltage of 18kV, a flow rate of 0.9mL / h, and an atmosphere with a relative humidity of 40%; the electrospun product obtained above was dried at 120°C;

[0039] Weigh 1.0mmol (0.096g) of 1,2-dimethylimidazole and dissolve it in 10mL of methanol to make solution A; weigh 3.0mmol (0.747g) of cobalt acetate tetrahydrate and dissolve it in 10mL of methanol to make a solution B;

[0040] The dried electrospun product obtained above was soaked in a solution containing Co 2+ Take it out after 30 minutes in methanol solution B containing ions, then take it out after soaking in methanol solutio...

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Abstract

The invention discloses a preparation method of cobalt oxide-modified carbon-doped tin-manganese composite oxide nanofibers, which comprises the steps of dissolving a certain amount of manganese acetate tetrahydrate and di-butyltin oxalate and a proper amount of polyacrylonitrile in a certain volume of N,N-dimethylformamide to obtain a faint yellow mixture solution precursor; then carrying out electrostatic spinning under the atmosphere of certain voltage, flow rate and certain relative humidity, sequentially soaking dried spinning products in a methanol solution containing Co<2+> ions, then soaking the spinning products in a methanol solution containing 1,2-dimethylimidazole, sintering in a nitrogen atmosphere in a tubular furnace to obtain the cobalt oxide modified carbon-doped tin-manganese composite oxide nanofibers. The nanofiber material has good electrochemical performance when being used as a lithium ion battery negative electrode material. In the whole preparation process ofthe material, the operation is simple, the cost of raw materials is low, the equipment investment is low, and batch production is facilitated.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a method for preparing cobalt oxide-modified carbon-doped tin-manganese composite oxide nanofibers. Background technique [0002] The negative electrode material is one of the key elements that determine the performance of lithium-ion batteries, accounting for about 30% of the battery cost. The anode material that has been commercially developed at present is carbon material (such as: graphite), which has high electrochemical stability, but has a low specific capacity (theoretical capacity is only 372mAh g -1 ), low initial charge-discharge efficiency, serious co-embedding of organic solvents, etc., cannot meet the practical requirements of high-capacity batteries. Therefore, the development of new non-carbon high-performance anode materials is particularly important (Scrosati B et al., J Power Sources, 2010, 195, 2419-2430; Nishi Y et al., Chem Rec, 2001, 1, 406-41...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/505H01M4/525H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/387H01M4/505H01M4/525H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 李星舒苗
Owner NINGBO UNIV
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