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Porous carbon material and preparation method thereof, lithium-sulfur battery modified diaphragm and preparation method thereof, and lithium-sulfur battery

A porous carbon material, lithium-sulfur battery technology, applied in lithium storage batteries, carbon preparation/purification, battery pack components, etc., can solve the problems of poor sulfur electrochemical activity, complex composite process, difficult size control, etc. The operation is simple and easy, the preparation method is simple, and the production cost is low.

Active Publication Date: 2022-03-25
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] Although lithium-sulfur batteries have many advantages, their practical application still faces many challenges.
Poor ionic and electronic conductivity of sulfur (at room temperature, the conductivity of sulfur is 5.0×10 -30 S / cm), leading to problems such as poor electrochemical activity and low utilization rate of sulfur in the electrode
The polysulfides produced during charging and discharging will dissolve in the electrolyte, shuttle to the negative electrode side due to the concentration difference, and react with metal lithium, resulting in the loss of positive and negative active materials, poor cycle performance, and serious capacity attenuation
In order to solve the problems existing in lithium-sulfur batteries, researchers have developed new sulfur cathode materials to limit the dissolution and shuttle of polysulfides from two aspects of adsorption and catalytic conversion. However, sulfur host materials with better effects often require a more tedious manufacturing process. , and usually sacrifices the sulfur content in the positive electrode, reducing the energy density of lithium-sulfur batteries; another effective solution is to modify the separator, that is, to coat a layer of functional materials on the surface of the separator facing the positive electrode , to inhibit the shuttling of polysulfides
Carbon materials have unique physical and chemical properties (high specific surface area, high conductivity, high pore volume, high chemical stability, etc.), which dominate the reported interlayers, but carbon materials are The weak adsorption of polysulfides is not conducive to the anchoring of sulfur species, so researchers compound carbon materials with more polar materials, such as various metal compounds, but metal compounds usually have high cost, difficult size control, and conductive Poor stability and complex recombination process are not conducive to the commercialization of lithium-sulfur batteries

Method used

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  • Porous carbon material and preparation method thereof, lithium-sulfur battery modified diaphragm and preparation method thereof, and lithium-sulfur battery
  • Porous carbon material and preparation method thereof, lithium-sulfur battery modified diaphragm and preparation method thereof, and lithium-sulfur battery
  • Porous carbon material and preparation method thereof, lithium-sulfur battery modified diaphragm and preparation method thereof, and lithium-sulfur battery

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preparation example Construction

[0052] According to a first aspect of the present invention, a method for preparing a porous carbon material is provided, comprising the following steps:

[0053] (a) providing the mixed colloid formed by carbon source, templating agent and water;

[0054] Wherein, the carbon source is gelatin, and the template includes a transition metal salt template;

[0055] (b) coating the mixed colloid on the substrate, then drying to obtain a film;

[0056] (c) using CO 2 The laser performs laser direct writing processing on the thin film on the substrate, and separates the material obtained after the direct writing processing from the substrate, washes, separates and dries to obtain a porous carbon material.

[0057] Specifically, in step (a), the present invention uses a specific type of carbon source so that it can form a colloid after being mixed with a template agent and water, thereby facilitating film formation in the later stage, while ensuring the generation of porous carbon ...

Embodiment approach

[0082] As an optional embodiment of the present invention, the binder includes polyvinylidene fluoride or carboxymethyl cellulose.

[0083] As an optional embodiment of the present invention, the solvent includes 1-methyl-2-pyrrolidone or water.

[0084] As an optional embodiment of the present invention, the mass ratio of the porous carbon material to the binder is (2-4):1, preferably 3:1. Typical but non-limiting mass ratios of porous carbon material and binder are 2:1, 2.5:1, 3:1, 3.5:1 or 4:1.

[0085] The modified layer has good adhesion and flexibility by further limiting the binder, the type of solvent, and the relative amounts of the porous carbon material and the binder.

[0086] As an optional embodiment of the present invention, the drying is vacuum drying.

[0087] As an optional embodiment of the present invention, the vacuum drying temperature is 60-80° C., and the vacuum drying time is 12-24 hours. A typical but non-limiting temperature for vacuum drying is 6...

Embodiment 1

[0094] This embodiment provides a method for preparing a porous carbon material, comprising the following steps:

[0095] (a) Add 2 g of carbon source gelatin to 10 mL of deionized water, heat and stir at 65°C for 60 min to form a colloid, then add 4 g of template agent zinc nitrate hexahydrate and continue stirring for 5 h to obtain a mixed colloid;

[0096] The mixed colloid was coated on the copper foil (substrate) to form a thin film with a uniform thickness of 400 μm, and then the film was dried in an oven at 60°C.

[0097] (b) Using 10.6μm wavelength CO 2 The laser performs direct writing processing on the thin film, the laser power is 3.6W, and the laser scanning speed is 343mm / s. The materials obtained after laser direct writing processing are as follows: figure 1 shown. The black powder on the surface of the material was scraped off and pickled in 2mol / L hydrochloric acid for 8 hours, and the pickling temperature was set at 60°C. After the pickling, it was washed w...

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Abstract

The invention provides a porous carbon material and a preparation method thereof, a lithium-sulfur battery modified diaphragm and a preparation method thereof, and a lithium-sulfur battery, and relates to the technical field of lithium-sulfur batteries. According to the preparation method of the porous carbon material, the colloid formed by the carbon source, the template agent and the water is coated to form the film, then the CO2 laser is adopted to carry out laser direct writing processing on the film on the substrate to prepare the porous carbon material, and the preparation method is simple in process, low in production cost, short in experimental period, simple and easy to operate and suitable for industrial production. And the prepared porous carbon material has a multi-stage pore structure and is rich in intrinsic defects. The invention also provides a lithium-sulfur battery modified diaphragm which is prepared from the porous carbon material, and due to the advantages of the porous carbon material, the lithium-sulfur battery modified diaphragm can effectively inhibit the shuttling phenomenon of polysulfide in the charging and discharging process of the lithium-sulfur battery, the utilization rate of active substances of the lithium-sulfur battery is improved, and the service life of the lithium-sulfur battery is prolonged. Therefore, the specific capacity and the cycling stability of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a porous carbon material and a preparation method thereof, a lithium-sulfur battery modified diaphragm and a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] With the large-scale development and utilization of green and renewable new energy, and the rapid development of electric vehicles and portable electronic devices, it is particularly urgent to develop clean and high-energy new energy storage systems. The low energy density of current commercial lithium-ion batteries has been unable to meet market requirements. Lithium-sulfur battery is an emerging battery energy system. Due to its high energy density (mass specific energy and theoretical specific capacity reach 2600Wh / kg and 1675mAh / g, respectively), in addition, elemental sulfur has abundant resources, low price, and environmental protection. friendly advantage, so it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M10/052H01M50/403H01M50/449
CPCC01B32/05H01M50/403H01M50/449H01M10/052Y02E60/10
Inventor 张梦迪郭世伟胡涵吴明铂董志亮牟佳伟尹天洢
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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