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Preparation method of flexible self-supporting Li3VO4/C nanofiber lithium ion battery negative electrode material

A technology of lithium ion battery and negative electrode material, applied in the field of electrochemical power supply, can solve the problems of low electronic conductivity and ionic conductivity of negative electrode material, large polarization, poor electrochemical reaction kinetics, etc. The effect of high capacity, excellent cycle stability

Pending Publication Date: 2021-12-07
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Li 3 VO 4 The electronic and ionic conductivity of the anode material is relatively low, which may lead to large polarization during charge / discharge, making the electrochemical reaction kinetics poor
In addition, there is currently no information about Li 3 VO 4 Reports on Flexible Electrodes

Method used

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  • Preparation method of flexible self-supporting Li3VO4/C nanofiber lithium ion battery negative electrode material
  • Preparation method of flexible self-supporting Li3VO4/C nanofiber lithium ion battery negative electrode material
  • Preparation method of flexible self-supporting Li3VO4/C nanofiber lithium ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]Accurately weigh 3.75 mmol of lithium nitrate, 3.75 mmol of oxalic acid, and 1.25 mmol of ammonium metavanadate according to stoichiometry, add them to 5 mL of N,N-dimethylformamide and stir in a water bath at a constant temperature of 60°C for 1 hour to obtain a uniform blue color Solution A; at the same time, take 0.65 g of polyacrylonitrile and add it to 5 mL N,N-dimethylformamide and stir for 30 minutes until a colorless and transparent solution is formed as solution B, then slowly drop solution A into solution B and stir for 12 hours to obtain a uniform blue electrospinning viscous solution ( Figure 5 a). Then the homogeneous solution obtained was transferred to an electrospinning syringe, and spun at a voltage of 15 kV and a temperature of 40 °C for 8 hours. After spinning, the fiber membrane was quickly transferred to an 80 °C blast drying oven for 12 hours, dried and placed in N 2 In the environment, at a heating rate of 3 °C / min, pre-calcined at 250 °C for 3 ...

Embodiment 2

[0028] The procedure of this example is exactly the same as that of Example 1, except that oxalic acid is not added, and 3.75 mmol of lithium nitrate and 1.25 mmol of ammonium metavanadate are weighed and added to 5 mL of N,N-dimethylformamide and kept in a water bath at a constant temperature of 60°C Stir at low temperature for 1 hour to obtain suspension A; at the same time, take 0.65 g of polyacrylonitrile and add it to 5 mL of N,N-dimethylformamide and stir for 30 minutes until a colorless and transparent solution is formed as solution B, then slowly dissolve solution A Drop in solution B and stir 12 hours, can't obtain homogeneous solution ( Figure 5 b), so electrospinning cannot be performed.

Embodiment 3

[0030] The procedure of this example is exactly the same as that of Example 1, the molar ratio of oxalic acid and ammonium metavanadate is increased to 5:1, and 3.75 mmol of lithium nitrate, 6.25 mmol of oxalic acid, and 1.25 mmol of ammonium metavanadate are added to 5 mL of N, N-dimethylformamide and stirred at a constant temperature of 60°C in a water bath for 1 hour to obtain a uniform green solution A; at the same time, 0.65 g of polyacrylonitrile was added to 5 mL of N,N-dimethylformamide and stirred for 30 minutes to Form a colorless transparent solution as solution B, then slowly drop solution A into solution B and stir for 12 hours to obtain a uniform green electrospinning viscous solution ( Figure 5 c). Then the mixed solution obtained was transferred to an electrospinning syringe, and spun at a voltage of 15 kV and a temperature of 40°C for 8 hours. hours, dried and placed in N 2 In the environment, at a heating rate of 3 °C / min, pre-calcined at 250 °C for 3 hour...

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Abstract

The invention provides a preparation method of a flexible self-supporting Li3VO4 / C nanofiber lithium ion battery negative electrode material, which comprises the following steps: adding lithium nitrate, ammonium metavanadate and oxalic acid into a proper amount of N, N-dimethylformamide, and stirring in a water bath at a constant temperature; meanwhile, taking polyacrylonitrile to be added into N, N-dimethylformamide and stirred, then slowly dropping the mixture into the solution, and obtaining a precursor fiber membrane through electrostatic spinning; and when the spinning process is finished, removing the precursor fiber membrane from the steel roller, drying, and calcining to obtain the flexible Li3VO4 / C nanofiber. The flexible self-supporting Li3VO4 / C composite nanofibers are prepared by combining the electrostatic spinning technology with high-temperature solid-phase sintering for the first time to serve as the negative electrode material of the lithium ion battery, the synthesis process method is simple, convenient and easy to operate, a prepared sample does not need an additional binder, a conductive agent and a current collector and can be directly cut to serve as an electrode plate for use, and the material has good mechanical flexibility and shows excellent electrochemical performance.

Description

technical field [0001] The invention relates to a novel lithium-ion battery anode material, in particular to a flexible self-supporting Li electrode prepared by electrospinning. 3 VO 4 The invention discloses a method for negative electrode materials of C / C nanofiber lithium ion batteries, which belongs to the field of electrochemical power sources. Background technique [0002] With the development of modern science and technology, flexible wearable electronic devices such as curved flexible displays, chemical and biological sensors, and thin-film solar panels have broad application prospects in the fields of defense technology, energy, medical care, and information technology. More and more electronic devices are developing in the direction of thinner, lighter, more flexible and wearable. At present, the biggest difficulty facing flexible electronic devices is to find suitable flexible energy storage devices. However, suitable flexible functional electrode materials are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36B82Y40/00
CPCH01M4/362B82Y40/00Y02E60/10
Inventor 倪世兵李道波许真张冬梅
Owner CHINA THREE GORGES UNIV
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