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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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current methods of constructing heterostructures generally adopt the strategy of using one material as a base and growing anothe

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

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[0031] Example 1

[0032] Fe 2 O 3 / ZnO precursor preparation: Dissolve 16g anhydrous ferric chloride and 14g anhydrous zinc chloride in a mixture of 500ml deionized water and 100ml alcohol, then pour 5g lithium hydroxide monohydrate and slowly drop 40ml The hydrogen peroxide solution is continuously stirred for 2h. After separation, washing and drying, a multi-element mixture is obtained. Take 10g of the mixture, mix with 4.5g of anhydrous lithium chloride and 5.5g of anhydrous potassium chloride and grind it evenly, then transfer it to a muffle furnace, and heat-treat it at 450°C for 2 h under air conditions to make 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 and 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 The / ZnO precursor powder was ultrasonically dispersed in 200 mL of Tris solutio...

Example Embodiment

[0036] Example 2

[0037] SnO 2 / ZnO precursor preparation: Take 10g of anhydrous stannous chloride and 20g of anhydrous zinc chloride and dissolve them in a mixture of 500ml of deionized water and 100ml of alcohol, then pour 5g of monohydrate sodium hydroxide and add slowly 40mL of hydrogen peroxide, continue to stir for 2h. After separation, washing and drying, a multi-element mixture is obtained. Take 10g of the mixture, mix with 6g of anhydrous sodium chloride and 4g of anhydrous potassium chloride and grind it evenly, then transfer to a muffle furnace, heat treatment at 450°C for 2 h under air conditions to make 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 and filtered and dried to obtain SnO 2 / ZnO precursor powder.

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

Example Embodiment

[0040] Example 3

[0041] MoO 3 / Fe 2 O 3 Precursor preparation: Dissolve 15g anhydrous ferric chloride and 15g ammonium molybdate tetrahydrate in a mixture of 500ml deionized water and 100ml alcohol, and then pour 5g lithium hydroxide monohydrate and slowly drop 40ml hydrogen peroxide , Continue to stir for 2h. After separation, washing and drying, a multi-element mixture is obtained. Take 10g of the mixture, mix with 7.5g of anhydrous sodium chloride and 2.5g of anhydrous calcium chloride and grind it evenly, then transfer it to a muffle furnace and heat it for 4h at 350°C under air conditions to make Fe 2 O 3 And MoO 3 Mix well in molten salt environment. Finally, the soluble salt is removed by washing with water. The salt can be recycled and 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 in 200 mL of aqueous solution,...

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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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