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A kind of vulcanized polymer composite material and its preparation method and application

A technology of composite materials and mixtures, applied in the direction of active material electrodes, positive electrodes, structural parts, etc., can solve the problems of carbonate-based electrolyte application obstacles, capacity fading, etc., and achieve improved electronic conductivity, low cost, and controllability strong effect

Active Publication Date: 2020-08-28
HENAN INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

due to S 8 When the molecules and their complexes are used as positive electrodes, the long-chain lithium polysulfides produced during the discharge process will undergo nucleophilic addition or substitution reactions with carbonate-based electrolytes, resulting in a significant loss of capacity, making carbonate-based electrolytes more effective in lithium-sulfur batteries. Apps in are blocked

Method used

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  • A kind of vulcanized polymer composite material and its preparation method and application
  • A kind of vulcanized polymer composite material and its preparation method and application
  • A kind of vulcanized polymer composite material and its preparation method and application

Examples

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Embodiment 1

[0026] A preparation method of a vulcanized polyaniline composite material, comprising the following steps: sublimed sulfur and polyaniline are mixed and ball-milled for 1 hour at a mass ratio of 6:1 to obtain a mixture (ethanol is added during ball milling, and the amount of ethanol is equal to the total amount of sublimated sulfur and polyaniline The liquid-solid ratio by weight is 1mL:1g). The mixture was placed in a tube furnace, heated to 320 °C at a rate of 5 °C / min under an Ar gas atmosphere, and reacted at 320 °C for 10 h to obtain a vulcanized polyaniline composite.

[0027] During co-heat treatment, sublimated sulfur (S 8 ) molecules are heated and broken into small molecules of sulfur (S 2-4 ), part of the small molecular sulfur reacts with polyaniline molecules and cross-links to form a three-dimensional network structure, and the remaining small molecular sulfur diffuses and embeds between the layers and pores of the network structure. The structure diagram of th...

Embodiment 2

[0031] A preparation method of vulcanized polypyrrole composite material, comprising the following steps: sublimated sulfur and polypyrrole are mixed and ball-milled for 1 hour at a mass ratio of 20:1 to obtain a mixture (during ball milling, N-N-dimethylformyl, N-N-dimethyl The liquid-solid ratio of the amount of formyl added to the total weight of sublimated sulfur and polypyrrole is 1mL:1g), the mixture is placed in a tube furnace, and the temperature is raised to 150°C at a rate of 20°C / min under a nitrogen atmosphere. And react at 150°C for 2 h to obtain the vulcanized polypyrrole composite material. The schematic diagram of the prepared vulcanized polypyrrole composite is shown below:

[0032] .

[0033] During heat treatment, sublimated sulfur (S 8 ) molecules are heated and broken into small molecules of sulfur (S 2-4 ), part of the small molecular sulfur reacts with polypyrrole molecules and cross-links to form a three-dimensional network structure, and the remai...

Embodiment 3

[0036] A method for preparing a vulcanized poly(3,4-ethylenedioxythiophene) composite material, comprising the following steps: sublimated sulfur and poly(3,4-ethylenedioxythiophene) are mixed and ball-milled for 12 hours at a mass ratio of 6:1 to obtain The mixture (N-methylpyrrolidone was added during ball milling, and the liquid-solid ratio of the amount of N-methylpyrrolidone added to the total weight of sublimated sulfur and poly(3,4-ethylenedioxythiophene) was 5mL:1g), and the mixture was placed In a tube furnace, under a nitrogen atmosphere, the temperature was raised to 280 °C at a rate of 2 °C / min, and reacted at 280 °C for 12 h to obtain vulcanized poly(3,4-ethylenedioxythiophene) composites. During heat treatment, sublimated sulfur (S 8 ) molecules are heated and broken into small molecules of sulfur (S 2-4 ), part of the small molecular sulfur reacts with polythiophene molecules and cross-links to form a three-dimensional network structure, and the remaining small...

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Abstract

The invention belongs to the field of electrochemical energy storage materials and their preparation, and discloses a vulcanized polymer composite material and its preparation method and application. The preparation method of the vulcanized polymer composite material comprises the following steps: uniformly mixing the sublimated sulfur and the conductive polymer, placing them in a tube furnace, and undergoing co-heating reaction under an inert atmosphere to prepare the vulcanized polymer composite material. In this material, the small molecular sulfur is firmly bound between the conductive polymer molecules under the action of physical constraints and chemical bonding, so that the "shuttle effect" caused by the dissolution of polysulfides is effectively controlled, and the polymer has excellent conductivity. It also effectively modifies the electronic conductivity of small sulfur molecules. The material has good compatibility with the carbonate-based electrolyte, and can obtain relatively excellent electrochemical performance. The sulfurized polypyrrole lithium-sulfur battery cathode material prepared by the invention exhibits excellent reversibility and cycle stability.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage materials and their preparation, in particular to a vulcanized polymer composite material and its preparation method and application. Background technique [0002] Facing the vigorous development of new energy technology, the continuous upgrading of electric energy storage technology and equipment has become an inevitable trend of social development. Lithium-ion batteries have become the preferred power source for various electronic products due to their high operating voltage, high energy density (light weight), no memory effect, long cycle life, and no pollution. However, in the traditional lithium-ion battery system, the capacity of the cathode material is low (LiFePO 4 and LiCoO 2 The theoretical specific capacities are 170 mAh / g and 274 mAh / g respectively), which restricts its application development in smart devices and electric vehicles. For this reason, people turn their at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/364H01M4/38H01M4/624H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 马晶晶李元超许光日
Owner HENAN INST OF SCI & TECH
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