Titanate and titanium dioxide composite nanowire and preparation method thereof

A technology of titanium dioxide and nanowires, which is applied in the field of material chemistry, can solve problems that restrict the development and application of carbon negative electrode materials, capacity fading, safety issues, etc., and achieve the effects of more active sites, growth inhibition, and high stability

Active Publication Date: 2019-08-02
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the carbon negative electrode material is discharged to a lower voltage, lithium dendrites will be generated, which will lead to a short circuit of the battery and easily cause serious safety problems; at the same time, in the continuous charge and discharge process, the surface of the carbon negative electrode inevitably forms a layer Stable electronically insulating solid electrolyte interfacial film (SEI), leading to rapid capacity decay and performance deterioration, restricts the development and application of carbon anode materials

Method used

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  • Titanate and titanium dioxide composite nanowire and preparation method thereof
  • Titanate and titanium dioxide composite nanowire and preparation method thereof
  • Titanate and titanium dioxide composite nanowire and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 5.0mL of N,N-dimethylformamide (DMF) to beaker A, then add 2.0mmoL (0.4982g) cobalt acetate tetrahydrate (C 4 h 6 CoO 4 4H 2 O), stirred for 0.5h, and cobalt acetate tetrahydrate was completely dissolved to obtain solution A, and the concentration of cobalt ions was 0.4mmol / mL; in beaker B, add 2.0mmoL (0.1320g) lithium acetate (C 2 h 3 LiO 2 ), and then add 2.0mL tetrabutyl titanate (C 16 h 36 o 4 Ti), 5.0mL absolute ethanol, 2.0mL acetic acid, stir for 0.5h to completely dissolve lithium acetate to obtain solution B, the concentration of lithium ions is about 0.22mmol / mL; slowly pour the solution in beaker B into beaker A , stirred for 0.5h, A and B solutions were mixed completely, added 1.40g of PVP (K-120, polyvinylpyrrolidone), stirred for 6h to form a clear spinning precursor solution C, and adjusted the pH of solution C to 2 with glacial acetic acid; Draw clear solution C into the syringe at a voltage of 15 kV, a receiving distance of 15 cm, and a flo...

Embodiment 2

[0028] Add 5.0mL of N,N-dimethylformamide (DMF) to beaker A, then add 2.00mmoL (0.4982g) cobalt acetate tetrahydrate (C 4 h 6 CoO 4 4H 2 O), stirred for 0.5h to completely dissolve cobalt acetate tetrahydrate to obtain solution A; add 2.0mmoL (0.1320g) lithium acetate (C 2 h 3 LiO 2 ), and then add 2.0mL tetrabutyl titanate (C 16 h 36 o 4 Ti), 5.0mL absolute ethanol, 2.0mL acetic acid, stir for 0.5h to completely dissolve lithium acetate to obtain solution B; slowly pour the solution in the B beaker into the A beaker, stir for 0.5h, and mix the A and B solutions Completely, add 1.40g of PVP (K-120, polyvinylpyrrolidone), stir for 6h to form a clear spinning precursor solution C, use glacial acetic acid to adjust the pH of solution C to 3.5; suck the clear solution C into the syringe, at 19kV The voltage, the receiving distance is 20cm, the flow rate is 0.6mL h -1 At a temperature of 35°C and a relative humidity of 30%, electrospinning was carried out; the obtained ele...

Embodiment 3

[0030] Add 5.0mL of N,N-dimethylformamide (DMF) to beaker A, then add 2.0mmoL (0.4982g) cobalt acetate tetrahydrate (C 4 h 6 CoO 4 4H 2 O), stirred for 0.5h to completely dissolve cobalt acetate tetrahydrate to obtain solution A; add 2.0mmoL (0.1320g) lithium acetate (C 2 h 3 LiO 2 ), and then add 2.0mL tetrabutyl titanate (C 16 h 36 o 4 Ti), 5.0mL absolute ethanol, 2.0mL acetic acid, stir for 0.5h to completely dissolve lithium acetate to obtain solution B; slowly pour the solution in the B beaker into the A beaker, stir for 0.5h, and mix the A and B solutions Completely, add 1.40g of PVP (K-120, polyvinylpyrrolidone), stir for 6h to form a clear spinning precursor solution C, use glacial acetic acid to adjust the pH of solution C to 2.5; suck the clear solution C into a syringe, The voltage, the receiving distance is 17.5cm, the flow rate is 0.4mL h -1 At a temperature of 30°C and a relative humidity of 25%, electrospinning was carried out; the obtained electrospinn...

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Abstract

The invention discloses a titanate and titanium dioxide composite nanowire and a preparation method thereof. The preparation method provided by the invention comprises the following steps: dissolvingtetrabutyl titanate, cobalt acetate tetrahydrate and lithium acetate in a mixed solvent of N, N-dimethylformamide, ethanol and acetic acid by using an electrospinning technology; adding polyvinylpyrrolidone and stirring to obtain a precursor mixture solution; electrospinning under a certain voltage, flow rate, temperature and certain relative humidity atmosphere; collecting and sintering electrospinning products in a muffle furnace under an air atmosphere to obtain the titanate and titanium dioxide composite nanowire provided by the invention. The composite nanowire is excellent in electrochemical performance, applicable to electrode materials of lithium ion batteries, and simple to operate, low in raw material and low in equipment investment in the whole preparation process, and suitablefor mass production.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a composite nanowire of titanate and titanium dioxide and a preparation method thereof. Background technique [0002] Electrospinning technology refers to a technology that sprays and stretches a polymer solution or melt under the action of a high-voltage electrostatic field, and obtains ultrafine fibers through solvent volatilization or melt solidification. This technology originated in the 1930s , with low manufacturing cost, simple process, super large specific surface area and extremely high porosity, and controllable structure, size and shape, can quickly obtain ultrafine fibers with a diameter distribution of several nanometers to several micrometers, so it has been favored by scientists. extensive attention. At present, nanofibers prepared by electrospinning technology include organic nanofibers, organic / inorganic hybrid composite nanofibers, inorganic nanofi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08
CPCD01F9/08
Inventor 刘语舟李星黄水平
Owner NINGBO UNIV
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