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Sulfur/copper sulfide/MXene positive electrode material and preparation method and application thereof

A positive electrode material, copper sulfide technology, applied in the field of nanomaterials, can solve the problems of unsatisfactory firmness, cumbersome steps, and unsuitability for large-scale production, and achieve good adsorption, increased specific capacity, and small size.

Inactive Publication Date: 2020-11-06
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has certain requirements on equipment, and the steps are cumbersome and not suitable for large-scale production. In addition, there is another method to mix sublimated sulfur with mesoporous silica, and after secondary calcination, sulfur element is embedded in the pore diameter by capillary force to obtain silica sulfur complex
This method completes sulfur fixation by capillary force, but its firmness is still unsatisfactory

Method used

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  • Sulfur/copper sulfide/MXene positive electrode material and preparation method and application thereof
  • Sulfur/copper sulfide/MXene positive electrode material and preparation method and application thereof
  • Sulfur/copper sulfide/MXene positive electrode material and preparation method and application thereof

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preparation example Construction

[0039] The invention provides a method for preparing a sulfur / copper sulfide / MXene positive electrode material, which can solve the technical problems of low sulfur loading, poor conductivity, low specific capacity, and poor cycle stability of lithium-sulfur batteries.

[0040] The technical solution is:

[0041] A preparation method of sulfur / copper sulfide / MXene cathode material, comprising the following steps:

[0042] Disperse MXene, copper salt and sulfur source in a solvent to obtain a mixed solution;

[0043] The mixed solution is placed in a closed pressure system, and the solvothermal reaction is carried out at 100°C to 180°C for 18h to 24h to prepare a copper sulfide / MXene nanocomposite material;

[0044] Mixing the copper sulfide / MXene nanocomposite material with elemental sulfur, and after grinding, place it at 155°C-180°C for 10h-18h to prepare the sulfur / copper sulfide / MXene positive electrode material;

[0045] The MXene is Ti 3 C 2 .

[0046] In some preferr...

Embodiment 1

[0076] This embodiment provides a sulfur / copper sulfide / MXene positive electrode material and a preparation method thereof, the specific steps are as follows:

[0077] Preparation of few-layer MXene(Ti 3 C 2 ): Weigh 2g of lithium fluoride with an electronic balance, measure 40ml of HCl aqueous solution with a concentration of 9mol / L in a graduated cylinder, place them in plastic beakers at a constant temperature of 35°C, stir and dissolve for 30min, and then use an electronic balance to weigh the titanium-based MAX ( Ti 3 AlC 2 ) phase precursor 2g, slowly put into a plastic beaker at a constant temperature of 35°C and continue to stir for 24 hours; then use distilled water to wash centrifugally and ultrasonically for several times, until the pH value is close to 7, collect the supernatant, which is the final product of few-layer MXene(Ti 3 C 2 ), and finally freeze-dry the suspension to obtain graphene-like few-layer MXene (Ti 3 C 2 ) solid powder.

[0078] Preparatio...

Embodiment 2

[0086] This embodiment provides a sulfur / copper sulfide / MXene positive electrode material and a preparation method thereof, the specific steps are as follows:

[0087] Preparation of few-layer MXene(Ti 3 C 2 ): use a graduated cylinder to measure 40ml of HF aqueous solution with a mass fraction of 40%, pour it into a plastic beaker, and then use an electronic balance to weigh the titanium series MAX (Ti 3 AlC 2 ) phase precursor 2g, slowly put it into a plastic beaker with a constant temperature of 35°C under magnetic stirring and continue to react for 24h; then use distilled water to wash centrifugally and ultrasonically for several times, until the pH value is close to 7, collect the supernatant which is the final product few-layer MXene ( Ti 3 C 2 ), and finally freeze and freeze-dry the suspension to obtain graphene-like few-layer MXene (Ti 3 C 2 ) solid powder.

[0088] Preparation of copper sulfide / MXene(Ti 3 C 2 ) nanocomposite material: the above-mentioned MXe...

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Abstract

The invention relates to a sulfur / copper sulfide / MXene positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: dispersing MXene, copper salt and a sulfur source in a solvent to obtain a mixed solution; placing the mixed solution in a closed pressure system, and carrying out solvothermal reaction at 100-180 DEG C for 18-24hours to prepare a copper sulfide / MXene nano composite material; mixing the copper sulphide / MXene nano composite material with elemental sulfur, grinding, and standing at 155-180 DEG C for 10-18 hoursto prepare a sulfur / copper sulphide / MXene positive electrode material; and the MXene is Ti3C2. The positive electrode material prepared by the method can improve the electrochemical performance of the lithium-sulfur battery.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a sulfur / copper sulfide / MXene positive electrode material and a preparation method and application thereof. Background technique [0002] Nowadays, in order to meet the increasing demand for large-scale energy storage and sustainable use, it is imminent to develop new electrochemical energy storage systems. In the new energy storage system, the theoretical specific energy of a lithium-sulfur battery with metallic lithium as the negative electrode and elemental sulfur as the positive electrode can reach 2600Wh / kg (the theoretical specific capacities of lithium and sulfur are 3860mAh / g and 1675mAh / g, respectively). Much larger than the commercial secondary batteries used at this stage. Moreover, lithium-sulfur batteries have attracted extensive attention due to their outstanding advantages of high specific energy, low raw material cost, and environmental friendliness, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/028Y02E60/10
Inventor 黄国家李露水许贤顺杨波李茂东翟伟徐青永
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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