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Carbon nano tube-containing sulfur-based composite cathode material and preparation method thereof

A composite positive electrode material and nanotube technology, which is applied in the field of sulfur-based composite positive electrode material and its preparation, can solve the problems of poor power characteristics and low electronic conductivity of lithium secondary batteries, achieve good cycle stability, simple synthesis method, Effect of Improving Power Characteristics

Active Publication Date: 2010-11-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Since elemental sulfur is an electronic insulating material, traditional sulfur-based cathode materials have significant disadvantages such as low electronic conductivity and poor power characteristics of lithium secondary batteries.

Method used

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  • Carbon nano tube-containing sulfur-based composite cathode material and preparation method thereof
  • Carbon nano tube-containing sulfur-based composite cathode material and preparation method thereof
  • Carbon nano tube-containing sulfur-based composite cathode material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0025] Disperse 0.7g of multi-walled carbon nanotubes in 100g of dimethyl sulfoxide and water in a mixed solvent with a mass ratio of 1:1, then add 20g of acrylonitrile, 0.3g of initiator ammonium persulfate, and continue stirring under nitrogen protection The temperature was raised to 50° C., kept for 3 hours, washed and filtered to obtain polyacrylonitrile coated on the surface of carbon nanotubes. figure 1 It is a TEM photo of polyacrylonitrile coated on the surface of multi-walled carbon nanotubes. It can be seen that acrylonitrile is more uniformly coated on the surface of multi-walled carbon nanotubes by in-situ polymers, with a thickness between 10-100nm. Mix elemental sulfur with polyacrylonitrile coated on the surface of carbon nanotubes at a mass ratio of 16:1, heat to 400°C under nitrogen protection and keep it warm for 1 hour to obtain a sulfur-based composite positive electrode material containing carbon nanotubes. Wherein the content of carbon nanotubes is 10wt%,...

Embodiment 2

[0027] Disperse 0.5g of multi-walled carbon nanotubes in 100g of dimethyl sulfoxide and water in a mixed solvent with a mass ratio of 1:1, then add 20g of acrylonitrile, 1g of itaconic acid, and 0.5g of initiator azobisisobutyrocyanide , under the protection of nitrogen, the temperature was increased to 65° C. under continuous stirring, kept for 2 hours, washed and filtered to obtain an acrylonitrile-itaconic acid copolymer coated on the surface of carbon nanotubes, wherein the content of itaconic acid was 4 wt%. Mix elemental sulfur with acrylonitrile-itaconic acid copolymer coated on the surface of carbon nanotubes in a mass ratio of 8:1, heat to 300°C under nitrogen protection and keep it warm for 4 hours to obtain a sulfur compound containing carbon nanotubes. matrix composite cathode material, wherein the content of carbon nanotubes is 6wt%, and the content of elemental sulfur is 42wt%.

[0028] figure 2It is a TEM photo of a sulfur-based composite positive electrode ma...

Embodiment 3

[0030] 0.3g multi-walled carbon nanotubes are dispersed in 100g dimethyl sulfoxide and the mixed solvent that water mass ratio is 1: 1, then add 25g acrylonitrile, 5g ammonium itaconate, 0.4g initiator ammonium chlorate, in Under the protection of nitrogen, the temperature was raised to 80° C. under continuous stirring, and kept for 8 hours, washed and filtered to obtain an acrylonitrile-ammonium itaconate copolymer coated on the surface of carbon nanotubes, wherein the content of ammonium itaconate was 10 wt%. Mix elemental sulfur with acrylonitrile-ammonium itaconate copolymer coated on the surface of carbon nanotubes in a mass ratio of 4:1, heat to 350°C under the protection of argon and keep it warm for 2 hours to obtain a carbon nanotube-containing The sulfur-based composite cathode material, wherein the content of carbon nanotubes is 3wt%, and the content of elemental sulfur is 50wt%.

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Abstract

The invention discloses a carbon nano tube-containing sulfur-based composite cathode material and a preparation method thereof. The sulfur-based composite cathode material is a ternary composite material AxByCz, wherein A is a dehydrocyclization product of an acrylonitrile-itaconic acid copolymer; B is elemental sulfur; C is a carbon nano tube; x is more than or equal to 30 weight percent and less than or equal to 60 weight percent; y is more than or equal to 30 weight percent and less than or equal to 60 weight percent; and z is more than or equal to 1 weight percent and less than or equal to 20 weight percent. The preparation method comprises the following steps of: in-situ polymerizing an acrylonitrile-itaconic acid monomer on the surface of the multi-wall carbon nano tube, and performing thermal treatment on both of the acrylonitrile-itaconic acid copolymer and the elemental sulfur, so that the sulfur is uniformly dispersed in a substrate formed by the dehydrocyclization of the acrylonitrile-itaconic acid copolymer. The carbon nano tube-containing sulfur-based composite cathode material and a lithium cathode form a secondary lithium-sulfur battery which is charged and discharged at the room temperature. The carbon nano tube-containing sulfur-based composite cathode material has the reversible specific capacity of 697 mAh / g and high cyclical stability.

Description

technical field [0001] The invention relates to a positive electrode material for batteries and a preparation method thereof, in particular to a sulfur-based composite positive electrode material containing carbon nanotubes and a preparation method thereof. Background technique [0002] Batteries are an indispensable device in contemporary society. From portable electronic products such as airplanes, to electric vehicles and aerospace vehicles, to the utilization of renewable energy, batteries are playing an irreplaceable role as energy storage and conversion devices. Compared with other commonly used secondary batteries, lithium-ion batteries have attracted extensive attention because of their high mass-specific energy and volume-specific energy. Low cost, high energy density, high safety, long cycle life, and green secondary batteries are the hotspots in the development of next-generation lithium batteries. [0003] The current commercial positive electrode materials are...

Claims

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Application Information

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IPC IPC(8): C08L33/20C08K7/00C08K3/04C08K3/06C08F120/44C08F220/46H01M4/13H01M4/139H01M4/38
CPCY02E60/122Y02E60/10
Inventor 王久林尹利超杨军努丽燕娜
Owner SHANGHAI JIAO TONG UNIV
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