Oxide-modified flexible composite sulfur positive electrode material and preparation method thereof

A sulfur cathode material and cathode material technology, which are applied in the field of flexible composite sulfur cathode materials and preparation, can solve the problems of reducing the relative content of active substances in the pole piece, limiting the energy density of the battery, poor conductivity of the binder, etc., so as to suppress the shuttle effect. , The effect of improving the mechanical strength of the electrode and improving the overall conductivity

Inactive Publication Date: 2018-03-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The preparation process of traditional positive electrode materials is complicated, and additives such as binders and conductive agents reduce the relative content of active materials in the elect

Method used

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  • Oxide-modified flexible composite sulfur positive electrode material and preparation method thereof
  • Oxide-modified flexible composite sulfur positive electrode material and preparation method thereof
  • Oxide-modified flexible composite sulfur positive electrode material and preparation method thereof

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[0035] Example 1

[0036] An oxide modified flexible composite sulfur cathode, the specific steps are

[0037] 1) Through the improved Hummers method, 4.0g graphite, 2.0g sodium nitrate and 92ml concentrated sulfuric acid are mixed uniformly, and 6.0g potassium permanganate is slowly added at 0°C and stirred for 1h. Then slowly increase the temperature to 35℃ for 5h, add 1000ml of water to dilute, and keep at 98℃ for 15min, then add 400ml of 60℃ distilled water to dilute. Add 20ml of 30% hydrogen peroxide solution to turn it into bright yellow, stir for 10min, wash with 7% hydrochloric acid three times, wash with distilled water to neutral, dialyze for three days, centrifuge and wash to neutral, freeze-dry for 48h to obtain graphene oxide;

[0038] 2) Take 0.1 g step 1) Put graphene oxide in a beaker, add 80 ml of ethanol, and ultrasonically disperse the graphene oxide for 12 hours at room temperature to obtain a graphene oxide dispersion. Add 0.0852g of tetrabutyl titanate and sti...

Example Embodiment

[0043] Example 2

[0044] An oxide modified flexible composite sulfur cathode, the specific steps are

[0045] 1) Take 0.14g of graphene oxide and 0.02g of carbon nanotubes and put them in a beaker, then add 80ml of a mixture of ethanol and water (V Ethanol : V water =3:1), the graphene oxide and carbon nanotubes are uniformly dispersed by ultrasound for 24h at room temperature to obtain GO / CNTs dispersion. Add 0.5g of zinc dioxide powder and stir it with magnetic force to make the solution evenly dispersed;

[0046] 3) Transfer the solution obtained in 2) to a reactor lined with polytetrafluoroethylene, and react in a vacuum drying oven at 98°C for 2 hours;

[0047] 4) The composite material obtained in 3) was vacuum-filtered and molded, and the filter cake was dried in a blast oven at 70°C for 5 hours to obtain TiO 2 / rGO / CNTs composite material; will sublimate sulfur and ZnO 2 / rGO / CNTs composite material is mixed, heated to 155°C for 12 hours in a closed container, then heated ...

Example Embodiment

[0049] Example 3

[0050] An oxide modified flexible composite sulfur cathode, the specific steps are

[0051] 1) Take 0.06g of graphene oxide and 0.06g of carbon fiber and put them in a beaker, add 80ml of propanol, and ultrasonically disperse the graphene oxide and carbon fiber evenly at room temperature to obtain a graphene / carbon fiber dispersion. Add 0.6g of titanium dioxide and stir it with magnetic force to make the solution evenly dispersed;

[0052] 3) Transfer the solution obtained in 2) to a reactor lined with polytetrafluoroethylene, and react in a vacuum drying oven at 180°C for 24 hours;

[0053] 4) Vacuum filter the composite material obtained in 3), and dry the filter cake in a blast oven at 80°C for 2 hours to obtain a titanium dioxide / graphene / carbon fiber composite material;

[0054] 5) Immerse the composite material in CS with dissolved active substance sulfur 2 In the solution, ultrasonically oscillate for 2 hours at room temperature to prepare a titanium dioxide / g...

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Abstract

The invention relates to an oxide-modified flexible composite sulfur positive electrode material and a preparation method thereof, belonging to the field of lithium-sulfur batteries. The material comprises a nanocarbon material, a metallic oxide and active material sulfur, wherein the nanocarbon material serves as a skeleton of a flexible positive electrode material; a mass ratio of the nanocarbonmaterial to the metallic oxide to the active material sulfur is 1:(0.01-5):(0.05-10); and sulfur in the flexible positive electrode material is uniformly dispersed in a pore channel of the metallic oxide modified nanocarbon material skeleton. The nanocarbon material on the surface of which oxides are uniformly compounded serves as the skeleton of the flexible positive electrode material, the sulfur serves as the active positive electrode material, and an oxide/nanocarbon material/sulfur composite material which can be used for the lithium-sulfur battery positive electrode material is compounded. The composite positive electrode material prepared by the invention has high conductivity and excellent flexibility and achieves an inhibiting effect on a shuttle effect of polysulfides, and the specific capacity, cycling stability, rate capability, coulombic efficiency and other electrochemical performances of the lithium-sulfur battery positive electrode are improved.

Description

technical field [0001] The invention relates to an oxide-modified flexible composite sulfur cathode material and a preparation method, belonging to the technical field of lithium-sulfur batteries. Background technique [0002] With the consumption of energy and the deterioration of the ecological environment, the need to find environmentally friendly and efficient energy storage devices is becoming more and more urgent. Rechargeable lithium-ion batteries have the advantages of high open circuit voltage, good cycle stability, and high energy density, making them widely used in digital products, electric vehicles, aerospace and other fields, but traditional lithium-ion batteries are limited by their theoretical capacity. , can no longer meet the needs of electronic products for high specific energy of batteries. Therefore, the development of alternative battery materials has long been the general trend. [0003] Lithium-sulfur batteries have broad application prospects as th...

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/583H01M4/04H01M10/052B82Y30/00
CPCB82Y30/00H01M4/043H01M4/364H01M4/38H01M4/48H01M4/583H01M10/052Y02E60/10
Inventor 穆道斌吴逸洲吴伯荣李纯莉姜颖丁银赵志坤刘北元
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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