Preparation method of flexible self-supporting iron-doped porous carbon nanofiber lithium metal negative electrode framework material

A lithium metal negative electrode and nanofiber technology is applied in the field of preparation of flexible self-supporting iron-doped porous carbon nanofiber lithium metal negative electrode skeleton materials, which can solve the problems of increasing battery internal resistance, battery short circuit, safety problems, etc. The method is simple, easy to scale production, and the effect of good practical prospects

Pending Publication Date: 2022-01-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the dendrite pierces the separator and contacts the positive electrode, it will cause a short circuit in the battery, causing safety problems
A reaction occurs between lithium metal and the electrolyte, which irreversibly consumes the active lithium metal material and electrolyte, drastically reducing the Coulombic efficiency
During the cycle, the dendritic lithium will fall off from the lithium sheet to form a "dead lithium" layer, which will not only reduce the Coulombic efficiency, but also increase the internal resistance of the battery and affect the cycle performance

Method used

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  • Preparation method of flexible self-supporting iron-doped porous carbon nanofiber lithium metal negative electrode framework material
  • Preparation method of flexible self-supporting iron-doped porous carbon nanofiber lithium metal negative electrode framework material
  • Preparation method of flexible self-supporting iron-doped porous carbon nanofiber lithium metal negative electrode framework material

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Experimental program
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Effect test

Embodiment 1

[0017] (1) Weigh 0.4g of iron acetylacetonate (Fe(C 5 h 7 o 2 ) 3 ), dissolved in 4.4g of N,N-dimethylformamide (DMF), then added 0.6g of polyacrylonitrile (PAN), 0.04g of polymethylmethacrylate (PMMA), and placed the resulting solution Stir magnetically in a water bath at 50° C. for 12 hours to form a uniform spinning solution.

[0018] (2) Using the method of solution electrospinning, suck the prepared spinning solution into a medical syringe, connect the rotating receiver to a positive pressure of 10kV, and the needle to a negative pressure of 8kV, turn on the micro-syringe pump to propel the spinning solution at a speed of 0.5ml / h. The silk solution advances, the spinning solution is stretched under the action of the electric field force, the solvent is volatilized, and the precursor nanofiber film is obtained on the rotating receiver with a rotation speed of 900r / min, and the distance between the needle and the rotating receiver is 12cm. Wherein, the environmental par...

Embodiment 2

[0021] (1) Weigh 0.6g of iron acetylacetonate (Fe(C 5 h 7 o 2 ) 3 ), dissolved in 4.4g of N,N-dimethylformamide (DMF), then added 0.6g of polyacrylonitrile (PAN), 0.04g of polymethylmethacrylate (PMMA), and placed the resulting solution Stir magnetically in a water bath at 50° C. for 12 hours to form a uniform spinning solution.

[0022] (2) Using the method of solution electrospinning, suck the prepared spinning solution into a medical syringe, connect the rotating receiver to a positive pressure of 10kV, and the needle to a negative pressure of 8kV, turn on the micro-syringe pump to propel the spinning solution at a speed of 0.5ml / h. The silk solution advances, the spinning solution is stretched under the action of the electric field force, the solvent is volatilized, and the precursor nanofiber film is obtained on the rotating receiver with a rotation speed of 900r / min, and the distance between the needle and the rotating receiver is 12cm. Wherein, the environmental par...

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Abstract

The invention discloses a preparation method of a flexible self-supporting iron-doped porous carbon nanofiber lithium metal negative electrode framework material, and belongs to the field of lithium metal battery materials. The nanofiber is prepared by taking cheap ferric acetylacetonate, polyacrylonitrile and polymethyl methacrylate as raw materials through electrostatic spinning and high-temperature heat treatment. The lithium metal negative electrode framework prepared by the preparation method has a relatively large specific surface area, an electric field can be uniform, and local current density can be reduced, so uniform lithium deposition is caused, and formation of lithium dendrites is effectively avoided; the three-dimensional porous main body can provide open pores so as to adapt to volume change and lithium ion transmission; the nitrogen and oxygen doped carbon main body can strongly interact with lithium atoms, so that lithium nucleation becomes easier and more uniform; meanwhile, the material is simple in preparation method, relatively low in cost, green and efficient, can be produced on a large scale, can be used as an ideal high-performance lithium metal negative electrode framework material, and has a very good practical prospect.

Description

technical field [0001] The invention relates to a preparation method of a flexible self-supporting iron-doped porous carbon nanofiber lithium metal negative electrode framework material, belonging to the field of lithium metal battery materials. Background technique [0002] With the rapid development of mobile phones, laptops, and electric vehicles, widely used lithium-ion batteries have encountered many difficulties in meeting the growing demand for energy storage systems with high energy density and long cycle life. Due to its high theoretical specific capacity (3860mAh g -1 ), low reaction potential (-3.04 V, compared to standard hydrogen electrodes), and light weight have long been considered the "holy grail" in electrode materials for next-generation lithium batteries. However, lithium metal batteries have a serious problem of lithium dendrite growth, which has delayed their industrialization. [0003] The growth of lithium dendrites is prone to cause a series of pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/583H01M10/052C01B32/15D01F8/08D01F8/10D01F1/10D04H1/43D04H1/4382D04H1/728D06C7/04B82Y40/00
CPCH01M4/583H01M4/1393H01M10/052C01B32/15D01F8/08D01F8/10D01F1/10D04H1/728D04H1/43825D06C7/04D04H1/43B82Y40/00H01M2004/027Y02E60/10
Inventor 刘勇余忠勋刘新华杨世春冯苏伟
Owner BEIJING UNIV OF CHEM TECH
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