Method for preparing lithium-sulfur battery composite positive electrode material by electrostatic spinning method and application of lithium-sulfur battery composite positive electrode material

A composite cathode material, electrospinning technology, applied in the field of electrochemical energy storage, can solve the problems of low utilization rate of active materials, poor cycle stability, low specific capacity, etc., and achieve excellent electrochemical performance, good lithium storage performance, The effect of simplifying the preparation process

Inactive Publication Date: 2019-05-17
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

At the same time, lithium-sulfur batteries are also facing some problems: simple substance S and the poor conductivity of the final discharge product lead to low utilization of active materials and low specific capacity; II) the intermediate discharge product Li 2 S x (4
Combining the sulfur cathode with a highly conductive material to improve conductivity and combinin

Method used

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  • Method for preparing lithium-sulfur battery composite positive electrode material by electrostatic spinning method and application of lithium-sulfur battery composite positive electrode material
  • Method for preparing lithium-sulfur battery composite positive electrode material by electrostatic spinning method and application of lithium-sulfur battery composite positive electrode material
  • Method for preparing lithium-sulfur battery composite positive electrode material by electrostatic spinning method and application of lithium-sulfur battery composite positive electrode material

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Embodiment 1

[0031] Example 1 Manganous Oxide / Nitrogen Doped Porous Carbon Fiber Composite Material Prepared by Electrospinning

[0032] 1) Dissolve 1g of polyacrylonitrile, 1g of polystyrene and 0.2g of manganese acetylacetonate in 10g of DMF, and stir well to form a uniform solution.

[0033] 2) Electrospinning: put the solution prepared in step 1) into a syringe, connect the syringe to a stainless steel needle through a catheter, and use a syringe pump to control the flow rate of 4mL / h to spray the solution through the needle. Aluminum foil was used as the nanofiber collector, and the vertical distance from the needle was 15 cm, and it was grounded at the same time. Connect the needle tube and the aluminum foil to the two poles of the high-voltage generator respectively, the voltage is 15kv, and under the conditions of the temperature of 40°C and the humidity of 60%, the organic nanofibers are started to be obtained on the aluminum foil.

[0034] 3) Preoxidizing the obtained organic na...

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Abstract

The invention discloses a method for preparing a lithium-sulfur battery composite positive electrode material by an electrostatic spinning method and application of the lithium-sulfur battery composite positive electrode material. The method comprises the steps of 1) synthesizing a PAN/PS/acetylacetone manganese nanofiber used as a precursor by an electrostatic spinning technology; and 2) obtaining a MnO nanoparticle composite nitrogen-doped porous carbon nanofiber composite material by the pre-oxidization and subsequent high-temperature carbonization process according to the characteristics of high-temperature decomposition of PS. The composite material is simple in preparation process and low in cost, is easy to process and can be used for production on a large scale. The nitrogen-dopedcarbon fiber framework of the material has a stable three-dimensional space structure, the conduction of lithium ion and electron is facilitated, and the conductivity of the sulfur composite positiveelectrode is improved; and meanwhile, MnO particles are grown in the nitrogen-doped porous carbon fibers in an in-situ way by the electrostatic spinning method, enough storage space is provided for elemental sulfur, lithium polysulfide can be effectively absorbed, and the shuttle effect of the lithium-sulfur battery is prevented.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a method and application of an electrospinning method for preparing a lithium-sulfur battery composite cathode material. Background technique [0002] Among all kinds of new secondary batteries, lithium-sulfur batteries have high theoretical specific capacity (1675mA h g -1 ), high specific energy density (2600Wh kg -1 ) and high volume specific energy density (2199W h L -1 ) advantages, it is considered to have great application prospects in high energy density energy storage systems (such as electric vehicles). In addition to appealing advantages, lithium-sulfur batteries are considered to be the development direction of the next-generation high-energy-density secondary battery system due to their abundant reserves, environmental friendliness, and low price, and have attracted extensive attention from new energy researchers. At the same time, lithium-sulfur batt...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/052B82Y30/00
CPCY02E60/10
Inventor 张磊李巍毕然田亚西刘国学
Owner SOUTH CHINA UNIV OF TECH
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