Carbon-coated Na2Li2Ti6O14 nanofiber and preparation method thereof

A nanofiber and carbon coating technology, applied in the direction of nanotechnology, nanotechnology, fiber chemical characteristics, etc., can solve the problems of poor electrical conductivity, restricted application, electrical conductivity needs to be improved, etc., to achieve excellent performance, high initial discharge specific capacity Effect

Active Publication Date: 2017-09-01
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2016, Li Xing, Wu Xianzong and others disclosed lithium sodium titanate nanowires and its preparation method (application number: 201610281086.9). The electrochemical performance of this material has been improved, but its electrical conductivity still needs to be improved. its application in practical engineering
At present, the relevant carbon-coated Na 2 Li 2 Ti 6 o 14 The research on nano one-dimensional materials has not been reported yet

Method used

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  • Carbon-coated Na2Li2Ti6O14 nanofiber and preparation method thereof
  • Carbon-coated Na2Li2Ti6O14 nanofiber and preparation method thereof
  • Carbon-coated Na2Li2Ti6O14 nanofiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 0.5mmol of Na 2 CO 3 and 3.0mmol of isopropyl titanate were dissolved in 20mL of N,N-dimethylformamide (DMF) to form solution A; 1.0mmol of LiCH 3 Dissolve COO in a mixed solvent of 10mL absolute ethanol and 3mL glacial acetic acid to form solution B; mix solutions A and B evenly, add 0.6g polyvinylpyrrolidone (PVP), stir for 10h, and form a clear mixed solution. The molar ratio of Na, Li and Ti is 1:1:3, and the concentration of polyvinylpyrrolidone (PVP) is 0.018g / mL; % atmosphere for electrospinning; put the obtained electrospun product in a 60°C oven for 24 hours; transfer the dried electrospun product to a muffle furnace and sinter at 800°C for 3 hours in an air atmosphere to obtain Na 2 Li 2 Ti 6 o 14 nanofibers; the sintered Na 2 Li 2 Ti 6 o 14 Nanofibers and sucrose were placed in two corundum boats respectively, and then sequentially placed in a tube furnace, at N 2 Sintered at 500°C for 8 hours in the atmosphere, N 2 It enters from the end of the co...

Embodiment 2

[0032] 3.0mmol of NaCH 3 COO and 9.0 mmol of tetrabutyl titanate were dissolved in 40 mL of N,N-dimethylformamide (DMF) to form solution A; 1.5 mmol of Li 2 CO 3 Dissolve in a mixed solvent of 10mL absolute ethanol and 4mL glacial acetic acid to form solution B; mix solutions A and B evenly, add 0.8g polyvinylpyrrolidone (PVP), and stir for 24h to form a clear mixed solution. Na in the solution , the molar ratio of Li to Ti element is 3:3:9, the concentration of polyvinylpyrrolidone (PVP) is 0.015g / mL; The clear solution is 70% under voltage 20kV and flow rate 1.0mL / h, relative humidity Electrospinning was carried out under an atmosphere; the obtained electrospun products were dried in an oven at 90 °C for 6 h; the dried electrospun products were transferred to a muffle furnace and sintered at 600 °C for 8 h in an air atmosphere to obtain Na 2 Li 2 Ti 6 o 14 nanofibers; the sintered Na 2 Li 2 Ti 6 o 14 Nanofibers and glucose were placed in two corundum porcelain boats...

Embodiment 3

[0034] 2.0mmol of NaCH 3 COO and 6.0 mmol of tetrabutyl titanate were dissolved in 30 mL of N,N-dimethylformamide (DMF) to form solution A; 1.0 mmol of Li 2 CO 3 Dissolve in a mixed solvent of 10mL absolute ethanol and 4mL glacial acetic acid to form solution B; mix solutions A and B evenly, add 0.7g polyvinylpyrrolidone (PVP), stir for 12h, and form a clear mixed solution. Na in the solution , the molar ratio of Li to Ti element is 2:2:6, the concentration of polyvinylpyrrolidone (PVP) is 0.016g / mL; The clarified solution is 60% under voltage 15kV and flow rate 0.5mL / h, relative humidity Electrospinning was carried out under an atmosphere; the obtained electrospun product was dried in an oven at 80 °C for 12 h; the dried electrospun product was transferred to a muffle furnace and sintered at 700 °C for 5 h in an air atmosphere to obtain Na 2 Li 2 Ti 6 o 14 nanofibers; the sintered Na 2 Li 2 Ti 6 o 14 Nanofibers and cellulose were placed in two corundum porcelain boat...

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Abstract

The invention discloses carbon-coated Na2Li2Ti6O14 nanofiber and a preparation method thereof. Sodium salt and titanium salt are dissolved in N,N-dimethylformamide; lithium salt is dissolved in a mixed solvent of ethyl alcohol and glacial acetic acid; then, two solutions are mixed; macromolecule polyvinylpyrrolidone is added; stirring is performed so that a clear solution is formed; the clear solution is subjected to electrostatic spinning under certain voltage, certain volume flow rate and certain relative humidity; an electrostatic spinning product is dried at constant temperature; then, high-temperature sintering is performed and corresponding Na2Li2Ti6O14 nanofiber is obtained; then, carbon coating is performed. The preparation of the carbon-coated Na2Li2Ti6O14 nanofiber is successfully realized; when the prepared nanofiber is used as a lithium ion battery negative electrode material to perform performance test representation, a result shows that the nanofiber has excellent physical and chemical properties, and has wide application prospects when being used as the lithium ion battery negative electrode material. In the whole preparation process, the operation is simple; the raw material cost is low; the equipment investment is low; the nanofiber is suitable for batch production.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, in particular to a carbon-coated Na 2 Li 2 Ti 6 o 14 Nanofibers and methods for their preparation. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries. Since they were commercialized by Sony Corporation in 1990, they have been widely used in power supplies for mobile devices, notebook computers, electric vehicles and energy storage devices. Because of its advantages such as high open circuit voltage, high energy density, long service life, no memory effect, no pollution, and low self-discharge rate, it has become the most mainstream and important chemical power source at present. The negative electrode material is one of the main components of the lithium-ion battery, and the performance of the negative electrode directly affects the performance of the lithium-ion battery. [0003] Na 2 Li 2 Ti 6 o 14 As a potential negative electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F11/12H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00D01F11/125H01M4/366H01M4/485H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 孙陈李星
Owner NINGBO UNIV
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