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K1.28Ti8O16, composite carbon nanofiber, preparation method of composite carbon nanofiber and application of composite carbon nanofiber in sodium-ion battery

A k1.28ti8o16, nanofiber technology, applied in the chemical characteristics of fibers, circuits, negative electrodes, etc., can solve the problems of lack of negative active materials, long-term cycle stability of electrochemical performance, etc., to achieve excellent long-term cycle stability, The effect of excellent crystal phase stability

Active Publication Date: 2021-01-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortage of negative electrode active materials for existing sodium ion batteries, the electrochemical performance, especially the long-term cycle stability under high current needs to be improved, the first purpose of the present invention is to provide a new K 1.28 Ti 8 o 16 Compound (the present invention is also referred to as K 1.28 Ti 8 o 16 negative active material)

Method used

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  • K1.28Ti8O16, composite carbon nanofiber, preparation method of composite carbon nanofiber and application of composite carbon nanofiber in sodium-ion battery
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  • K1.28Ti8O16, composite carbon nanofiber, preparation method of composite carbon nanofiber and application of composite carbon nanofiber in sodium-ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] 1) Preparation of precursor solution: Mix 8g ethanol, 2.4g acetic acid, and 2.85g tetrabutyl titanate at 20-25°C to obtain a mixed solvent, and add an appropriate amount of CH 3 COOK (K / Ti molar ratio is 1:3.0), magnetic stirring at 500rpm at room temperature for 30min to make CH 3 COOK was completely dissolved; then 1 g of polyvinylpyrrolidone was added, and magnetically stirred at the same rotational speed for 12 hours to obtain an electrospinning precursor solution.

[0072] 2) Electrospinning: extract 15ml of precursor solution with a medical syringe, and use a No. 20 flat-mouth stainless steel needle to spin on an electrospinning device. The nanofibers obtained by spinning are received by aluminum foil; the distance between the needle and the receiving plate is 22cm , the spinning voltage is 20KV, the ambient temperature is 25°C, the humidity is 30%, and the feeding speed is 0.8ml / h.

[0073] 3) The nanofibers obtained by spinning were pre-carbonized in a muffle f...

Embodiment 2

[0079] 1) Preparation of precursor solution: Mix 8g ethanol, 2.4g acetic acid, and 2.85g tetrabutyl titanate at 20-25°C to obtain a mixed solvent, and add an appropriate amount of CH 3 COOK (K / Ti molar ratio is 1:2.5), magnetic stirring at 500rpm for 30min to make CH 3 COOK was completely dissolved; then 1 g of polyvinylpyrrolidone was added, and magnetically stirred at the same rotational speed for 12 hours to obtain an electrospinning precursor solution.

[0080] 2) Electrospinning: extract 15ml of precursor solution with a medical syringe, and use a No. 20 flat-mouth stainless steel needle to spin on an electrospinning device. The nanofibers obtained by spinning are received by aluminum foil; the distance between the needle and the receiving plate is 22cm , the spinning voltage is 20KV, the ambient temperature is 25°C, the humidity is 30%, and the feeding speed is 0.8ml / h.

[0081] 3) The nanofibers obtained by spinning were pre-carbonized in a muffle furnace (air atmosphe...

Embodiment 3

[0087] 1) Preparation of precursor solution: Mix 8g ethanol, 2.4g acetic acid, and 2.85g tetrabutyl titanate at 20-25°C to obtain a mixed solvent, and add an appropriate amount of CH 3 COOK (K / Ti molar ratio is 1:3.5), magnetic stirring at 500rpm for 30min to make CH 3 COOK was completely dissolved; then 1 g of polyvinylpyrrolidone was added, and magnetically stirred at the same rotational speed for 12 hours to obtain an electrospinning precursor solution.

[0088] 2) Electrospinning: extract 15ml of precursor solution with a medical syringe, and use a No. 20 flat-mouth stainless steel needle to spin on an electrospinning device. The nanofibers obtained by spinning are received by aluminum foil; the distance between the needle and the receiving plate is 22cm , the spinning voltage is 20KV, the ambient temperature is 25°C, the humidity is 30%, and the feeding speed is 0.8ml / h.

[0089] 3) The nanofibers obtained by spinning were pre-carbonized in a muffle furnace (air atmosphe...

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Abstract

The invention belongs to the technical field of battery negative electrode materials, and particularly discloses a K1.28Ti8O16 active negative electrode material and a preparation method and application of a K1.28Ti8O16@C nanofiber sodium ion battery negative electrode material. The brand-new material can be obtained through the cooperation of the raw materials,utilization of the electrostatic spinning technology and cooperation of the combined control of the pre-carbonization process and the annealing process. The battery negative electrode material disclosed by the invention has the advantages that a nano one-dimensional skeleton formed by compounding the carbon fiber and K1.28Ti8O16 has good structural stability, so that the cycle performance of the material is improved; and meanwhile,electronic conductivity in an electrode is promoted, the diffusion distance of sodium ions is shortened, the volume expansion of the battery in the charging and discharging process is slowed down, andthe safety of a sodium ion battery is improved. The preparation process is simple, large-scale production is easy, and good application prospects are achieved.

Description

technical field [0001] The invention relates to the field of electrode materials for sodium ion batteries, in particular to a K 1.28 Ti 8 o 16 Preparation method and application of @C nanofiber sodium ion battery anode material. Background technique [0002] Energy and environmental issues are two major challenges facing human society today. The depletion of non-renewable energy sources and increasingly serious environmental pollution force people to research and discover cleaner and renewable energy technologies. Na-ion batteries have the advantages of low cost, abundant raw materials, and environmental friendliness, and are considered to be a secondary energy storage technology that is expected to replace lithium-ion batteries. [0003] Although sodium-ion batteries and lithium-ion batteries are only different in intercalation ions on the surface, sodium ions are about 55% larger than lithium ions, and the difficulty of intercalation and diffusion is doubled compared wi...

Claims

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Application Information

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IPC IPC(8): D01F9/21D01F9/22D01F1/10H01M4/36H01M4/485H01M4/62H01M10/054
CPCD01F9/21D01F9/22D01F1/10H01M4/366H01M4/485H01M4/625H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 刘赛男陈鑫祥蔡圳阳刘会群章海敏胡东阳郑巧莲
Owner CENT SOUTH UNIV
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