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A kind of self-supporting lithium-sulfur positive electrode material of network polymer containing N and O atoms and preparation method thereof

A positive electrode material and polymer technology, applied in the field of self-supporting lithium-sulfur positive electrode materials and their preparation, can solve the difficulties in meeting the commercialization requirements of lithium-sulfur batteries, the lack of polar sites, heteroatoms and pore structures in the capacity of multi-carbon materials Uncontrollable and other problems, to achieve the effect of inhibiting the shuttle effect, accelerating the redox reaction speed, and good conductivity

Active Publication Date: 2021-07-02
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although lithium-sulfur batteries have great advantages in energy density and cost, there are still many intractable fatal problems that prevent their practical application.
According to the above-mentioned reaction mechanism of lithium-sulfur batteries and a large number of research results, there are mainly the following problems in the charging and discharging process of lithium-sulfur batteries: (1) The electronic insulation of solid elemental sulfur and discharge products
However, the capacity of prepared multi-carbon materials generally lacks polar sites, heteroatoms and pore structures are uncontrollable. These problems lead to low initial specific capacity, poor cycle stability and poor rate performance when traditional porous carbon materials are used as lithium-sulfur battery cathodes. and other problems, it is difficult to meet the requirements of commercialization of lithium-sulfur batteries

Method used

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  • A kind of self-supporting lithium-sulfur positive electrode material of network polymer containing N and O atoms and preparation method thereof
  • A kind of self-supporting lithium-sulfur positive electrode material of network polymer containing N and O atoms and preparation method thereof
  • A kind of self-supporting lithium-sulfur positive electrode material of network polymer containing N and O atoms and preparation method thereof

Examples

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Embodiment 1

[0055] A method for preparing a self-supporting lithium-sulfur positive electrode material of a network polymer containing N and O atoms, comprising the following steps:

[0056] (1) Prepare dinitrile monomers containing N and O, and vacuum-dry the obtained dinitrile monomers at 100° C. for 24 hours; the dinitrile monomers are monomer 1 described in the Summary of the Invention, wherein Ar1 is benzene Ring, Ar Be benzene ring; Monomer 1 described in the present embodiment is OPDN, and wherein, the concrete preparation process of OPDN is as follows: in the there-necked flask, add the bromine (structural formula is as follows i shown), 3g potassium ferrocyanide, 3.5g sodium carbonate, 0.1g palladium acetate, add the N-methylpyrrolidone NMP of 100ml in the there-necked flask again, stir and under agitation vacuumize then fill with nitrogen, be warming up to React at 120°C for 12h; pour the obtained reaction solution into 500mL of ethanol, stand for 25h, filter with suction and co...

Embodiment 2

[0064] A method for preparing a self-supporting lithium-sulfur cathode material of a network polymer containing N and O atoms. Include the following steps:

[0065] (1) Prepare a dinitrile monomer containing N and O, and vacuum-dry the obtained dinitrile monomer at 100° C. for 24 hours; the dinitrile monomer is the monomer 1 described in the Summary of the Invention, wherein Ar1 is a Benzene, Ar3 is a benzene ring. (The dinitrile monomer described in this example is OPBN)

[0066] (2) with the prepared N, O dinitrile monomer and anhydrous zinc chloride prepared in step (1) in a molar ratio of 1:5, place in a quartz ampoule after mixing in a glove box, and vacuumize seal.

[0067] (3) The ampoule obtained in step (2) was placed in a muffle furnace for reaction: the temperature was raised to 400°C at a rate of 5°C / min, and the temperature was maintained for 10 hours; then the temperature was raised to 600°C at a rate of 1°C / min, and Incubate for 24h.

[0068] (4) Grind the ...

Embodiment 3

[0074] A method for preparing a self-supporting lithium-sulfur positive electrode material of a network polymer containing N and O atoms, comprising the following steps:

[0075] (1) Prepare dinitrile monomers containing N and O, and vacuum-dry the obtained dinitrile monomers at 100° C. for 24 hours; the dinitrile monomers are monomer 1 described in the Summary of the Invention, wherein Ar1 is benzene ring, and Ar3 is a benzene ring. For the specific preparation method, see step (1) of Example 1.

[0076] (2) with the prepared N, O dinitrile monomer of step (1) and anhydrous zinc chloride in a molar ratio of 1:5, in the glove box (water and oxygen content are less than 0.01ppm) after mixing Place in a quartz ampoule and vacuum seal.

[0077] (3) The ampoule obtained in step (2) was placed in a muffle furnace for reaction: the temperature was raised to 400°C at a rate of 5°C / min, and the temperature was maintained for 10 hours; then the temperature was raised to 800°C at a rat...

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Abstract

The invention discloses a self-supporting lithium-sulfur cathode material of a network polymer containing N and O atoms and a preparation method thereof. The preparation method comprises: step 1, preparing a dinitrile monomer containing N and O; 2. Mix the obtained dinitrile monomer with a catalyst to obtain a mixture; step 3, heat the mixture to obtain a polymer; step 4, grind the polymer into powder, and then carry out acid Washing and washing with water to obtain powder materials; Step 5, mixing the powder materials with sulfur, and then performing melting treatment to obtain a composite material of network polymer and sulfur Step 6, mixing the composite material of network polymer and sulfur Add carbon nanotubes into water, perform ultrasonic treatment and filter to obtain. The lithium-sulfur battery in which the network polymer containing N and O atoms is used as the cathode material has good stability.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium-sulfur secondary batteries, and in particular relates to a self-supporting lithium-sulfur positive electrode material of a network polymer containing N and O atoms and a preparation method thereof. Background technique [0002] Since the beginning of the 21st century, with the growth of the global population, the rapid development of industry, the overuse of fossil fuels, environmental pollution, and energy shortages, a series of problems have become increasingly serious, gradually threatening the survival and development of human beings. At present, the development and utilization of cheap, green, safe and renewable clean energy has become an important link to achieve sustainable development. However, new renewable energy sources such as wind energy, solar energy, and tidal energy are all intermittent energy sources, which are seriously affected by geographical en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/052C08G73/06
CPCC08G73/0677H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 蹇锡高胡方圆刘程张守海王锦艳翁志焕
Owner DALIAN UNIV OF TECH
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