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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
  • Application Information

AI Technical Summary

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 electrode sheet, which limits the energy density of the battery
In addition, the binder has poor conductivity and is prone to failure during the battery cycle, which will cause a decline in battery performance.

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

Examples

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Embodiment 1

[0036] An oxide-modified flexible composite sulfur positive electrode, the specific steps are

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

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

Embodiment 2

[0044] An oxide-modified flexible composite sulfur positive electrode, the specific steps are

[0045] 1) Get 0.14g of graphene oxide and 0.02g of carbon nanotubes and put them in a beaker, then add the mixed solution of 80ml of ethanol and water (V 乙醇 :V 水 =3:1), at room temperature, the graphene oxide and carbon nanotubes were uniformly dispersed by ultrasonication for 24 hours to obtain a GO / CNTs dispersion. Add 0.5g of zinc dioxide powder, and stir the solution evenly by magnetic stirring;

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

[0047] 4) The composite material obtained in 3) was formed by vacuum suction filtration, and the filter cake was dried in a blast oven at 70°C for 5 hours to obtain TiO 2 / rGO / CNTs composite material; combining sublimated sulfur with ZnO 2 / rGO / CNTs composite materials were mixed, heated to 155 °C for 12 h in a closed container, ...

Embodiment 3

[0050] An oxide-modified flexible composite sulfur positive electrode, the specific steps are

[0051] 1) Put 0.06g of graphene oxide and 0.06g of carbon fiber in a beaker, add 80ml of propanol, and ultrasonically disperse the graphene oxide and carbon fiber at room temperature to obtain a graphene / carbon fiber dispersion. Add 0.6g of titanium dioxide, and stir the solution evenly by magnetic stirring;

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

[0053] 4) The composite material obtained in 3) is formed by vacuum suction filtration, and the filter cake is dried in a blast oven at 80° C. for 2 hours to obtain a titanium dioxide / graphene / carbon fiber composite material;

[0054] 5) Soak the composite in CS dissolved in the active substance sulfur 2 solution, ultrasonic vibration at room temperature for 2 hours to prepare a titanium dioxide / graphene / carbon fiber / sulf...

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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...

Claims

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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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