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Conductive polymer/carbon-sulfur composite electrode and preparation method

A conductive polymer, carbon-sulfur composite technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as uncontrollable coating uniformity and thickness, poor solubility of conductive polymers, and inability to fully reflect the advantages. , to achieve the effect of inhibiting the dissolution of sulfur, improving stability, and improving electrochemical utilization.

Inactive Publication Date: 2015-01-28
NANJING ZHONGCHU NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned preparation method uses direct chemical oxidation to synthesize conductive polymers, and the coated conductive polymers have poor solubility and low molecular weight, and cannot control the coating uniformity and thickness, and the conjugated structure is incomplete, and the conductivity Not high; solution impregnation is used to compound sulfur in the preparation, sulfur and conductive polymer are only physically combined, the binding force between the two is weak, and the binding of sulfur is weak; in addition, the conductive polymer in the structure of the composite material is only the The form of covering on the outer layer cannot fully reflect the advantages of the polymer-graphene-sulfur three-system composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of graphene airgel: Use graphene oxide powder and deionized water to prepare an aqueous solution with a concentration of 10mg / ml, ultrasonically oscillate for 5 hours, then add 100ml of the prepared graphene oxide aqueous solution into the hydrothermal reactor, and heat at 150°C The graphene oxide hydrogel was prepared by reacting at low temperature for 24 hours, and then the graphene oxide hydrogel was put into ammonia water, soaked at 150°C for 24 hours, and freeze-dried for 24 hours to obtain the graphene oxide airgel.

[0035] (2) Composite polypyrrole: configure 0.2mol / L potassium chloride solution, add 0.1mol / L pyrrole monomer to the solution, adjust the acidity of the solution to pH=3.0 with hydrochloric acid, and place the graphene airgel in Soak in this mixed solution for 20min, then use graphene airgel as working electrode, saturated calomel electrode as reference electrode, platinum electrode as counter electrode, adopt cyclic voltammetry to pr...

Embodiment 2

[0038] The preparation of graphene airgel is the same as that in Example 1. Steps (2) and (3) in Example 1 are reversed. First, compound sulfur on the surface of graphene airgel, and then compound polypyrrole to coat the outermost layer. The polypyrrole / carbon-sulfur composite electrode 2 was obtained.

Embodiment 3

[0040] (1) The preparation of graphene airgel is the same as in Example 1.

[0041](2) Composite polyaniline: Prepare a sulfuric acid solution with a proton concentration of 0.7mol / L, add 0.1mol / L aniline monomer to it, soak the graphene airgel in the mixed solution for 20min, and then The gel is used as the working electrode, the saturated calomel electrode is used as the reference electrode, and the platinum electrode is used as the counter electrode. Polyaniline is prepared by cyclic voltammetry, the electrodeposition voltage is 0.8V, and the reaction time is 0.5~1h; finally the product is taken out and washed with distilled water , and drying to obtain a polyaniline / graphene airgel composite material.

[0042] (3) Composite sulfur: heat the elemental sulfur to a molten state, put the prepared polyaniline / graphene airgel composite into it under the protection of argon, keep it for 5~10h, take it out and dry it in an oven to form Polyaniline / carbon-sulfur composite electrod...

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Abstract

The invention discloses a conductive polymer / carbon-sulfur composite electrode and a preparation method. The composite electrode consists of graphene aerogel, a conductive polymer and sulfur. The preparation method is characterized by comprising the steps of firstly preparing the graphene aerogel serving as a three-dimensional conductive framework, and then loading an active substance in the graphene aerogel to obtain the conductive polymer / carbon-sulfur composite electrode, wherein the active substance is the conductive polymer and elemental sulfur. The composite electrode prepared by the preparation method disclosed by the invention is easy to prepare and light in mass, has the advantages of large specific surface area, high conductivity, high energy density and the like and can be widely applied to the field of secondary batteries and capacitors, and the shape and the size of the composite electrode can be adjusted optionally.

Description

technical field [0001] The invention belongs to the field of battery material science, and relates to an electrode and a preparation method thereof, in particular to a composite electrode for a secondary battery. Background technique [0002] With the rapid development of mobile electronic and communication devices, the demand for secondary batteries is more urgent, and more and more tends to develop dense, thin, small, light and high energy density batteries. Sulfur electrodes are widely used in secondary batteries, but due to the non-conductive nature of elemental sulfur and the dissolution of discharge intermediate products in organic electrolytes, it is easy to cause low utilization of active materials, passivation of electrodes, and decrease in battery capacity. , poor cycle performance and other issues, the current solution is to compound elemental sulfur with a conductive carrier. [0003] Graphene airgel is a new type of carbon material with ultra-light weight, ultr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139
CPCH01M4/13H01M4/139Y02E60/10
Inventor 赵宇光钟毓娟
Owner NANJING ZHONGCHU NEW ENERGY
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