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Carbon-coated polysulfide heterojunction material, preparation method and application

A technology of sulfide and heterojunction, applied in the direction of electrical components, structural parts, electrochemical generators, etc., can solve the problems of complex preparation methods, limited heterogeneous interface, and inability to express, and achieve the effect of simple process

Active Publication Date: 2019-06-25
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current methods of constructing heterostructures generally adopt the strategy of using one material as a base and growing another material on it (such as: CN201811100693.6, CN201811267252.5). Limited interface, unable to exhibit excellent heterogeneous interface effect

Method used

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  • Carbon-coated polysulfide heterojunction material, preparation method and application
  • Carbon-coated polysulfide heterojunction material, preparation method and application
  • Carbon-coated polysulfide heterojunction material, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Fe 2 o 3 / ZnO precursor preparation: Dissolve 16g of anhydrous ferric chloride and 14g of anhydrous zinc chloride in a mixture of 500ml deionized water and 100ml alcohol, then pour 5g of lithium hydroxide monohydrate and slowly drop 40mL Hydrogen peroxide, stirring continuously for 2h. After separation, washing and drying, a multivariate mixture is obtained. Get 10g of the mixture, mix and grind it evenly with 4.5g of anhydrous lithium chloride and 5.5g of anhydrous potassium chloride, then transfer it to a muffle furnace, and heat it at 450°C for 2 h under air conditions, so that Fe 2 o 3 Mix well with ZnO in molten salt environment. Finally, the soluble salt is removed by washing with water. The salt can be recycled, filtered and dried to obtain Fe 2 o 3 / ZnO precursor powder.

[0033] Carbon coated Fe 9 S 10 / ZnS heterojunction preparation: take 6g Fe 2 o 3 / ZnO precursor powder was ultrasonically dispersed in 200mL Tris solution with pH=8.5, and 2g of dop...

Embodiment 2

[0037] SnO 2 / ZnO precursor preparation: Dissolve 10g of anhydrous stannous chloride and 20g of anhydrous zinc chloride in a mixture of 500ml deionized water and 100ml alcohol, then pour 5g of sodium hydroxide monohydrate and slowly drop 40mL of hydrogen peroxide, stirring continuously for 2h. After separation, washing and drying, a multivariate mixture is obtained. Take 10g of the mixture and mix it with 6g of anhydrous sodium chloride and 4g of anhydrous potassium chloride and grind it evenly, then transfer it to a muffle furnace, and heat it at 450°C for 2 h under air conditions, so that the SnO 2 Mix well with ZnO in molten salt environment. Finally, the soluble salt is removed by washing with water. The salt can be recycled, filtered and dried to obtain SnO 2 / ZnO precursor powder.

[0038] Carbon coated Sn 2 S 3 / ZnS heterojunction preparation: take 6g SnO 2 / ZnO precursor powder was ultrasonically dispersed in 200mL aqueous solution, and 2g glucose was added unde...

Embodiment 3

[0041] MoO 3 / Fe 2 o 3 Preparation of the precursor: Dissolve 15g of anhydrous ferric chloride and 15g of ammonium molybdate tetrahydrate in a mixture of 500ml of deionized water and 100ml of alcohol, then pour in 5g of lithium hydroxide monohydrate and slowly dropwise add 40mL of hydrogen peroxide , and continued stirring for 2h. After separation, washing and drying, a multivariate mixture is obtained. Get 10g of mixture and 7.5g of anhydrous sodium chloride and 2.5g of anhydrous calcium chloride, mix and grind evenly, then transfer to the muffle furnace, heat treatment at 350°C for 4h under air conditions, so that Fe 2 o 3 and MoO 3 Mix well in a molten salt environment. Finally, the soluble salt is removed by washing with water. The salt can be recycled, filtered and dried to obtain MoO 3 / Fe 2 o 3 Precursor powder.

[0042] Carbon-coated MoS 2 / Fe 9 S 10 Preparation of heterojunction: Take 6g MoO 3 / Fe 2 o 3 The precursor powder was ultrasonically dispersed...

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Abstract

The invention relates to the technical field of preparation of electrochemical cell electrode materials, and provides a carbon-coated polysulfide heterojunction material, which is composed of a core body and a shell body coating the outer side of the core body, wherein the core body is a polysulfide heterojunction and the shell body is a carbon layer. The polysulfide heterojunction is a mixture oftwo or more transition metal sulfides. The method for preparing the polysulfide heterojunction material is easy to operate, low in processing cost, good in treatment effect, wide in application range, recyclable and friendly to environment. The material is coated with carbon and is used as an electrochemical cell electrode material to solve the technical problem of low ion and electron transmission speed in the electrode material in the prior art, thereby achieving a high reversible capacity and good rate performance.

Description

technical field [0001] The invention relates to the technical field of preparation of electrochemical cell electrode materials, in particular to a carbon-coated polysulfide heterojunction material, a preparation method and an application. Background technique [0002] Whether it is the development of the world's power grid and the efficient use of renewable energy (solar, wind, tidal energy), or the demand for future clean transportation based on electric vehicles, it needs the support of cheap and efficient electrochemical energy storage technology. The carrier of electrochemical energy storage is a battery. In the existing energy storage battery system, lithium-ion batteries have conquered the portable electronics market due to their advantages such as high working voltage, high capacity, small self-discharge and long cycle life, and have become the mainstay of electric vehicles. (including EV and HEV, etc.) and the primary choice of power supply for large-scale energy sto...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCY02E60/10
Inventor 韩飞张成智刘金水张福全王飞
Owner HUNAN UNIV
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