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Porous polymer-sulfur composite material, preparation method and application thereof

A porous polymer and polymer technology, applied in the direction of active material electrodes, structural parts, positive electrodes, etc., can solve the problems of increasing material and battery costs, increasing battery energy density, complex post-processing, etc., and achieve excellent cycle stability, Effect of suppressing shuttling and high Coulombic efficiency

Active Publication Date: 2021-11-16
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of such composite materials requires either high-temperature conversion (such as carbonization) above 300 °C, or complex post-treatment (removal of templates), and the proportion of these matrix materials (such as metal oxides) in the positive electrode of lithium-sulfur batteries The ratio is large, which increases the cost of materials and battery manufacturing, and limits the improvement of battery energy density

Method used

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  • Porous polymer-sulfur composite material, preparation method and application thereof
  • Porous polymer-sulfur composite material, preparation method and application thereof
  • Porous polymer-sulfur composite material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] (1) Preparation of porous polymer

[0092] Monomer I is an aldehyde monomer, R 1 with R 2 All are H, n=1

[0093] Monomer II is an amine monomer, R 3 for H, R 4 for-SO 3 H,n=1

[0094] The monomer I and the monomer II are weighed according to the molar ratio of 1:1, dispersed in the mixed solvent of butanol, dichlorobenzene and acetic acid with a volume ratio of 2:4:1, sealed tube and vacuumized 5℃min -1 The temperature was raised to 120° C., and the insulation reaction was carried out for 72 hours to obtain a porous polymer ( figure 1 ). Combined with the infrared spectrum ( figure 2 ) analysis, it is not difficult to find that monomer I reacts with monomer II to form an imine bond to obtain a porous polymer. The specific surface area of ​​the resulting porous polymer is 500 m 2 g -1 , with a pore volume of 0.9 cm 3 g -1 , the pore size is 1.4nm.

[0095] (2) Preparation of porous polymer-sulfur composites

[0096] The above-mentioned porous poly...

Embodiment 2

[0103] Other is identical with embodiment 1, difference is:

[0104] R in monomer I 1 for R 2 for H, n=1

[0105] R in monomer II 3 for H, R 4 for-SO 3 H,n=1

[0106] The specific surface area of ​​the obtained porous polymer is 620m 2 g -1 , the pore volume is 0.85cm 3 g -1 , the pore size is 1.2nm; the mass percentage of sulfur in the porous polymer-sulfur composite material is about 70%.

[0107] The obtained lithium-sulfur battery is subjected to the same test method as in Example 1, and the 0.1C discharge specific capacity is 1608mAh g -1 , the discharge specific capacity after 50 cycles is 882mA h g -1 .

Embodiment 3

[0109] Others are the same as Example 1, the difference is:

[0110] Monomer IR 1 for R 2 for H, n=1

[0111] R in monomer II 3 for H, R 4 for-SO 3 H, n=2

[0112] The specific surface area of ​​the resulting porous polymer is 570 m 2 g -1 , the pore volume is 0.96cm 3 g -1 , the pore size is 1.3nm; the mass percentage of sulfur in the porous polymer-sulfur composite is about 77%.

[0113] The obtained lithium-sulfur battery is subjected to the same test method as in Example 1, and the 0.1C discharge specific capacity is 1614mAh g -1 , the discharge specific capacity after 50 cycles is 896mA h g -1 .

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Abstract

The invention discloses a porous polymer-sulfur composite material, a preparation method and application thereof. According to the method, a porous polymer is obtained through reaction of aldehyde monomers and amine monomers, and sulfur dissolved in a solvent is poured into the porous polymer to obtain a porous polymer-sulfur composite material, wherein sulfur in the porous polymer-sulfur composite material is uniformly dispersed in the pore channels and the surface of the polymer. The invention provides an application of the porous polymer-sulfur composite material as a positive electrode of a lithium-sulfur battery, wherein the porous polymer shows high sulfur loading capacity and strong ion adsorption effect, and the positive electrode based on the porous polymer-sulfur composite material and the corresponding battery have high specific discharge capacity and excellent cycle stability. The porous polymer-sulfur composite material provided by the invention has the advantages of simple preparation method, easily available raw materials, suitability for large-scale production and high practical degree.

Description

technical field [0001] The invention belongs to the field of polymer material preparation and electrochemical power supply, and specifically relates to a porous polymer-sulfur composite material and its preparation method and application. Background technique [0002] Lithium-sulfur batteries are a type of secondary batteries that use sulfur or sulfur-containing compound positive electrodes to match metal lithium negative electrodes and electrolytes. The high theoretical specific capacity of the battery is achieved through the two-electron electrochemical reaction between sulfur and lithium. Compared with other metal or metal oxide positive electrodes, sulfur or sulfur-containing compounds as the positive electrode has the advantages of abundant reserves, low cost, and environmental friendliness. The metal lithium secondary battery constructed on this basis has very important scientific research value and broad application prospects. [0003] Despite the above-mentioned out...

Claims

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Application Information

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IPC IPC(8): C08G12/08C08L61/22C08K3/06H01M4/36H01M4/38H01M4/60H01M10/052
CPCC08G12/08C08K3/06H01M4/362H01M4/38H01M4/602H01M10/052H01M2004/028C08L2203/20C08L61/22H01M4/36H01M4/60H01M4/13C07C65/30C08G12/40C08G12/00Y02E60/10
Inventor 曾宪祥李江玉张淑
Owner HUNAN AGRICULTURAL UNIV
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