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Porous nano carbon fiber material, lithium battery cathode material and cathode plate

A technology of carbon nanofibers and composite cathode materials, applied in the field of electrochemistry, can solve problems such as rapid capacity decay, and achieve the effects of reducing solvent solubility, uniform distribution, and less demanding operation and environmental requirements.

Active Publication Date: 2011-07-20
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the rapid capacity decay is currently the biggest problem encountered by sulfur cathode materials in lithium battery applications, due to their electronic ion insulation and the dissolution of materials or lithium intercalation products in organic solvents.

Method used

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  • Porous nano carbon fiber material, lithium battery cathode material and cathode plate
  • Porous nano carbon fiber material, lithium battery cathode material and cathode plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The preparation of embodiment 1 high surface area carbon nanofiber material

[0054] Dissolve 8% by mass of polyacrylonitrile (PAN) / polymethyl methacrylate (PMMA) (7:3, mass ratio) powder in 92% by mass of N-N dimethylformamide (DMF) , Stir vigorously at 60°C for 24h to obtain a homogeneous polymer solution. The solution is subjected to electrospinning under the action of a high-voltage direct current power supply with a voltage of 20kV. The electrospinning obtained above was pre-oxidized at 280°C for 2 hours, and the heating rate was controlled at 10°C / min. The pre-oxidized electrospinning was carbonized at a high temperature in a tube furnace with nitrogen as a protective gas, and carbonized at 1200°C for 1 hour. Finally, Porous nano-carbon fiber material: the length is about 8μm, the diameter is 200nm, and the interior contains a microporous structure with a pore size of about 10nm.

Embodiment 2

[0055] The preparation of embodiment 2 high surface area carbon nanofiber material

[0056] Dissolve 10% by mass of poly(acrylonitrile-styrene) P(AN-St) (AN:St=8:2, molar ratio) powder in 90% by mass of N-N dimethylformamide (DMF ), vigorously stirred at 60°C for 24h to obtain a homogeneous polymer solution. The solution is subjected to electrospinning under the action of a high voltage DC power supply with a voltage of 10kV. The electrospinning obtained above was pre-oxidized at 160°C for 4 hours, and the heating rate was controlled at 10°C / min. The pre-oxidized electrospinning was carbonized at a high temperature in a tube furnace with nitrogen as a protective gas, and carbonized at 600°C for 3 hours. Finally, Porous nano-carbon fiber material: the length is about 6 μm, the diameter is 150 nm, and the interior contains a microporous structure with a pore size of about 8 nm.

Embodiment 3

[0057] Example 3 Preparation of Elemental Sulfur / Porous Nano-Carbon Fiber Composite Positive Electrode Material for Lithium Batteries

[0058] The porous nano-carbon fiber material of Example 1 was used to prepare elemental sulfur / porous nano-carbon fiber composite cathode material.

[0059] Dissolve 1 g of sodium sulfide in 20 mL of deionized water to prepare a sodium sulfide solution. Add 1.23g of sublimated sulfur powder to the above sodium sulfide solution for reaction, stir at 25°C for 3 hours until the sulfur powder is completely dissolved, and brown-red sodium polysulfide (Na 2 S x ) solution, and filtered. Dissolve 0.182g of the surfactant cetyltrimethylammonium bromide (CTAB) in 100mL of deionized water, adjust to pH>8 with 0.1mol / L NaOH solution, and mix the filtered sodium polysulfide solution with 0.3 g porous nano-carbon fiber material was simultaneously added to deionized water containing surfactant CTAB, and then ultrasonically stirred for 60 minutes to obtai...

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Abstract

The invention discloses a porous nano carbon fiber material, a lithium battery elemental sulfur / porous nano carbon fiber composite anode material and an anode plate which are prepared from the porous nano carbon fiber material. The lithium battery elemental sulfur / porous nano carbon fiber composite anode plate is prepared by using the method: (1) mixing lithium battery elemental sulfur / porous nano carbon fiber composite anode material shown by the right requirements 3 with acetylene black and an adhesive and uniformly stirring to obtain a mixture; and (2) adding an N-methyl pyrrolidone solution to the mixture obtained in the step (1), proportioning into paste and scraping the paste on a carbon-coated aluminum foil as a current collector and drying to obtain an elemental sulfur / porous nano carbon fiber composite anode plate. Lithium sulphur batteries made by utilizing the anode plate of the invention have greatly-improved cycle performance.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a material for preparing a lithium battery, in particular to a porous nano-carbon fiber material, a lithium battery elemental sulfur / porous nano-carbon fiber composite positive electrode material prepared from the porous nano-carbon fiber material and Positive sheet. Background technique [0002] Energy shortage and environmental pollution are the two most concerned problems in the world today. The energy shortage and environmental pollution problems caused by the application of fuel-powered transportation tools are particularly prominent. The long-term solution is to use hydrogen energy. It will take some time to solve the problem. In the medium and long term, using secondary batteries as pure power or hybrid power is an inevitable choice to solve energy shortages and environmental pollution. [0003] Due to the advantages of high energy density, small self-discharge, no memory...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D01F9/21D01F9/26D01D5/00H01M4/62H01M4/13H01M4/139H01M10/0525
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 饶睦敏廖友好李小平李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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