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

3 Cites 18 Cited by

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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

With Fe9S10/ZnS@C heterojunction material as sodium ion battery negative electrode material, as shown in Figure 3, charge and discharge with large current density 500 mA g-1, the first effect is up to 85%, after 100 cycles Fe9S10 The /ZnS@C heterojunction still maintains an ultrahigh capacity close ...

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.

Application Domain

Cell electrodesSecondary cells

Technology Topic

IonElectron transmission +10

Image

Examples

Experimental program(5)
Comparison scheme(2)
Effect test(1)

Example Embodiment

[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 solution with pH=8.5, and 2 g of dopamine was added under stirring. Then, stirring was continued for 24 hours at 30°C under water bath conditions, and the polydopamine-coated precursor was obtained after filtration, washing and drying. The sample is transferred to the tube furnace, at N 2 Heat to 450°C for 2h in an atmosphere. Finally, the temperature of the sample is increased to 550°C, with N 2 For carrier gas, pass into CS 2 Gas, in CS 2 Treated in the atmosphere for 2h to obtain carbon-coated Fe 9 S 10 /ZnS heterojunction material.

[0034] Attached figure 1 In the XRD, it can be clearly seen that Fe 9 S 10 /ZnS has significant Fe in heterojunction 9 S 10 And characteristic peaks of ZnS components. in figure 2 Clear Fe 9 S 10 Heterogeneous interface with ZnS, indicating the formation of good Fe 9 S 10 /ZnS heterostructure.

[0035] Take Fe 9 S 10 /ZnS@C heterojunction materials are used as anode materials for sodium ion batteries, such as image 3 As shown, with a high current density of 500 mA g -1 Charge and discharge, the first effect is as high as 85%, Fe after 100 cycles 9 S 10 /ZnS@C heterojunction still remains close to 600mAh g -1 The ultra-high capacity. In addition, the material has excellent rate performance ( Figure 4 ), when the current density reaches 10 and 20 A g -1 The reversible capacity can be maintained at 408 and 339 mAh g -1 Around, it further proves that the material has super electron ion transport ability.

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 g of glucose was added under stirring. Then the suspension was transferred to a hydrothermal kettle at 170°C for continuous heating treatment for 24 hours, filtered, washed, and dried to obtain a polysaccharide-coated precursor. The sample is transferred to the tube furnace, at N 2 Heat to 450°C for 2h in an atmosphere. Finally, the temperature of the sample is increased to 550°C, with N 2 For carrier gas, pass into CS 2 Gas, in CS 2 Treated under the atmosphere for 2h to obtain carbon-coated Sn 2 S 3 /ZnS heterojunction material.

[0039] Attached Figure 5 XRD shows Sn 2 S 3 /ZnS heterojunction has significant Sn 2 S 3 And the characteristic peaks of ZnS components, indicating the successful construction of Sn 2 S 3 /ZnS heterojunction. Sn 2 S 3 /ZnS@C heterojunction material is used as the anode material of sodium ion battery, at a high current density of 500 mA g -1 Charge and discharge, the first effect is as high as 80%, after 100 cycles, the reversible capacity remains at 500 mAh g -1 about.

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, and 1.1 g of resorcinol, 10 mL of ammonia and 1.5 mL of formaldehyde solution were added in sequence while stirring. Then, stirring was continued for 5 hours at 60°C under water bath conditions, and a phenolic resin coated precursor was obtained after filtration, washing, and drying. The sample is transferred to the tube furnace, at N 2 Heat to 550°C for 2h in an atmosphere. Finally, the sample was mixed with sulfur, placed in the heater again, and the temperature was raised to 300°C for 5 hours to obtain carbon-coated MoS 2 /Fe 9 S 10 Heterojunction material.

PUM

Property	Measurement	Unit
Inverse capacity	339.0 ~ 408.0	mahg-1
Inverse capacity	500.0	mahg-1

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Carbon-coated polysulfide heterojunction material, preparation method and application

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Problems solved by technology

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Description & Claims & Application Information

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