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Preparation method and application of carbon nanofiber/metal-phase molybdenum disulfide/sulphur composite material having multi-stage structure

A carbon nanofiber, molybdenum disulfide technology, applied in structural parts, active material electrodes, electrode carriers/current collectors, etc., can solve problems such as unfavorable large-scale preparation, high energy consumption, cumbersome and lengthy, and avoid the preparation process. Cumbersome and the use of binders, simple production process, and the effect of improving the overall conductivity

Inactive Publication Date: 2018-03-02
HARBIN INST OF TECH
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  • Summary
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  • Claims
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Problems solved by technology

At the same time, multi-level structure materials are widely used in the fields of electrocatalysis and energy. However, the traditional methods of constructing multi-level structures are mostly cumbersome and tedious, consume a lot of energy, and are not conducive to large-scale preparation. The preparation of polar materials with multi-level structures can effectively improve lithium-sulfur batteries. performance of

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  • Preparation method and application of carbon nanofiber/metal-phase molybdenum disulfide/sulphur composite material having multi-stage structure
  • Preparation method and application of carbon nanofiber/metal-phase molybdenum disulfide/sulphur composite material having multi-stage structure

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specific Embodiment approach 1

[0021] Specific Embodiment 1: This embodiment records a method for preparing carbon nanofibers with a multi-level structure, metal phase molybdenum disulfide and sulfur composite materials. The steps of the method are as follows:

[0022] Step 1: Dissolve 182 mg ammonium molybdate, 304 mg L-cysteine, and 113 ~452 mg sodium borohydride in 70 mL of mixed solution, ultrasonically dissolve for 30 min, put carbon nanofibers in and continue ultrasonication for 30 min, and then place the The mixed solution of carbon nanofibers was transferred to a polytetrafluoroethylene reactor, heated in water at 180°C for 24 hours, cooled to room temperature naturally, the carbon nanofibers were taken out, washed with water and ethanol in turn, and dried overnight in an oven at 70°C to obtain Carbon nanofiber and metal phase molybdenum disulfide composites with multi-level structure;

[0023] Step 2: Weigh 200-400mg of sulfur powder and dissolve it in 5mL of carbon disulfide, and impregnate the ca...

specific Embodiment approach 2

[0024] Specific embodiment two: the preparation method of a kind of carbon nanofiber with multi-level structure, metal phase molybdenum disulfide and sulfur composite material described in specific embodiment one, in step one, described mixed solution is made of DMF and water according to 1.5:1 volume ratio composition.

specific Embodiment approach 3

[0025] Specific embodiment three: the preparation method of a kind of carbon nanofiber with multi-level structure, metal phase molybdenum disulfide and sulfur composite material described in specific embodiment one, in step one, described carbon nanofiber and metal phase two The morphology of the molybdenum sulfide composite is a multi-level structure of nanosheets with smooth surface.

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Abstract

A preparation method and an application of a carbon nanofiber / metal-phase molybdenum disulfide / sulphur composite material having a multi-stage structure. The invention belongs to the technical field of energy materials. The method includes steps of: 1) dissolving ammonium molybdate, L-cysteine and sodium borohydride in a mixed solution, adding carbon nanofibers, moving the mixture to a polytetrafluoroethylene reaction kettle, performing hydrothermal reaction, natural cooling the product to room temperature and drying the product in a drying box overnight; 2) weighing 200-400 mg of sulphur powder and dissolving the sulphur powder in 5 ml of carbon disulfide, impregnating the product in the step 1) into the sulphur solution, taking the product out, vacuum-drying the product, and heating andcalcining the product to prepare the carbon nanofiber / metal-phase molybdenum disulfide / sulphur composite material having the multi-stage structure. The material can achieve high-effective utilizationof sulphur and produce a lithium-sulphur battery having stable cycle performance. A carbon nanofiber / metal-phase molybdenum disulfide composite material is prepared through the simple hydrothermal method in one step, so that the preparation method is easy to carry out and can control the components in the final product.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a preparation method and application of carbon nanofibers with a multi-level structure, metal phase molybdenum disulfide and sulfur composite materials. Background technique [0002] With the development of the portable electronics industry, the demand for high specific energy batteries is more urgent, limited by the specific capacity of traditional materials such as lithium cobalt oxide and lithium manganese oxide, lithium ion batteries can no longer meet the current demand. It is imperative to seek a secondary battery with higher specific capacity. Lithium-sulfur batteries have attracted the attention of researchers in recent years. Due to their high specific capacity (1675mAh / g), low cost, wide source of elemental sulfur, and non-toxicity, they are expected to become the next generation of high specific energy secondary battery systems. . [0003] Howeve...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/66H01M10/052
CPCH01M4/362H01M4/38H01M4/62H01M4/624H01M4/663H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 孙克宁王茂旭范立双张乃庆
Owner HARBIN INST OF TECH
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