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Molybdenum disulfide-carbon hollow ball hybrid material and preparation method thereof

A technology of molybdenum disulfide and hybrid materials, which is applied in the field of energy storage materials, can solve the problems of cumbersome preparation process, long synthesis cycle, loss of single/few layers of molybdenum disulfide, etc., and achieve simple process, improved rate performance, and easy The effect of industrial production

Inactive Publication Date: 2015-11-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the current single / few-layer molybdenum disulfide sheets are mainly prepared by the exfoliation method (G, D.Du, et.al., Chem.Commun, 2010, 46, 1106; J.Xiao, et.al., Chem .Mater., 2010,22,4522.), this method can peel off the bulk molybdenum disulfide into nano monolithic layer, but its synthesis period is long, the preparation process is loaded down with trivial details, and needs to add a large amount of organic reagents; In addition, because There is van der Waals force between the sheets, and the synthesized single / few-layer molybdenum disulfide sheets will reunite and re-accumulate during the charging and discharging process, making molybdenum disulfide lose the characteristics of single / few-layer molybdenum disulfide

Method used

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  • Molybdenum disulfide-carbon hollow ball hybrid material and preparation method thereof
  • Molybdenum disulfide-carbon hollow ball hybrid material and preparation method thereof
  • Molybdenum disulfide-carbon hollow ball hybrid material and preparation method thereof

Examples

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Embodiment 1

[0030] (1) Preparation of negative electrode material (molybdenum disulfide-carbon hollow sphere hybrid material):

[0031] Step 1. At room temperature, add 1g of silica nanospheres (particle size about 100nm) to 10ml of absolute ethanol, after ultrasonic treatment, then add 8ml of triaminopropyltriethoxysilane, and magnetically stir for 2 hours to form a suspension liquid; after the suspension is centrifuged to obtain the first reaction product, the first reaction product is washed with ethanol, and then the first reaction product is dried, and the dried first reaction product is Amino-modified silica particles.

[0032] Step 2: Add 1g of ammonium tetrathiomolybdate, 4g of glucose and 2g of the amino-modified silica particles obtained in step 1 into 30ml of N,N-dimethylformamide, stir vigorously for 2h and then pour it into a 50ml reaction kettle. Then the reaction kettle was heated from room temperature to 220°C, and the reaction kettle was kept at 220°C for 4h, and then th...

Embodiment 2

[0045] Preparation of negative electrode material (molybdenum disulfide-carbon hollow sphere hybrid material):

[0046] Step 1. At room temperature, add 0.5g of silica nanospheres (particle size about 250nm) to 25ml of absolute ethanol. After ultrasonic treatment, add 0.5ml of triaminopropyltriethoxysilane and stir magnetically for 0.5h Finally, a suspension is formed; the suspension is centrifuged to obtain a first reaction product, and the first reaction product is washed with ethanol, and then the first reaction product is dried, and the first reaction product after drying is The product is amino-modified silica particles.

[0047] Step 2. Add 0.2g ammonium tetrathiomolybdate, 2.5g glucose and 0.5g amino-modified silica particles obtained in step 1 into 10ml N,N-dimethylformamide, stir vigorously for 1h and pour into 20ml reaction Then, the reaction kettle was heated from room temperature to 180°C, and the reaction kettle was kept at 180°C for 10h, and then the product in ...

Embodiment 3

[0051] Preparation of negative electrode material (molybdenum disulfide-carbon hollow sphere hybrid material):

[0052] Step 1. At room temperature, add 5g of silica nanospheres (particle size about 50nm) to 70ml of absolute ethanol, after ultrasonic treatment, then add 30ml of triaminopropyltriethoxysilane, and magnetically stir for 1 hour to form a suspension liquid; after the suspension is centrifuged to obtain the first reaction product, the first reaction product is washed with ethanol, and then the first reaction product is dried, and the dried first reaction product is Amino-modified silica particles.

[0053] Step 2. Add 6g of ammonium tetrathiomolybdate, 25g of glucose and 3g of the amino-modified silica particles obtained in step 1 into 50ml of N, N-dimethylformamide, stir vigorously for 2 hours and then pour it into a 100ml reaction kettle. Then, the reaction kettle was heated from room temperature to 200°C, and the reaction kettle was kept at 200°C for 6h, and the...

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Abstract

The invention discloses a molybdenum disulfide-carbon hollow ball hybrid material. The molybdenum disulfide-carbon hollow ball hybrid material has a hollow ball structure; and the hybrid material formed by embedding a single layer of molybdenum disulfide nanosheet or a few of layers of molybdenum disulfide nanosheets into a carbon material is a shell layer of the hollow ball. The invention further discloses a preparation method of the molybdenum disulfide-carbon hollow ball hybrid material. The method comprises the following steps: with amino-modified silica particles as a template, coating the template with an organic pyrolytic carbon material and ammonium tetrathiomolybdate through solvothermal reaction; carrying out high-temperature treatment in an inert atmosphere; and finally removing a silicon dioxide template, so as to obtain the molybdenum disulfide-carbon hollow ball hybrid material disclosed by the invention. The initial lithium insertion capacity of the molybdenum disulfide-carbon hollow ball hybrid material disclosed by the invention is close to 1010mAh / g; and the specific capacity can still be kept at 662mAh / g after 40 repeated charge and discharge cycles.

Description

technical field [0001] The invention relates to the design of a molybdenum disulfide-carbon hollow sphere hybrid material for lithium ion batteries and a preparation method thereof, belonging to the technical field of energy storage materials. Background technique [0002] As a graphite-like material, molybdenum disulfide has been widely used in solid lubricants, catalysis, supercapacitors, lithium-ion battery materials and other fields. In terms of lithium-ion battery materials, compared with silicon, germanium, tin and other high-capacity lithium-ion battery anode materials, the advantages of molybdenum disulfide anode materials are reflected in the low volume change rate (5% change rate) before and after lithium intercalation. High stability, and high rate capacity determined by the rapid diffusion of lithium ions and good conductivity. [0003] However, the bulk molybdenum disulfide anode material has poor conductivity, and the cycle stability and reversibility are not ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5815H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 高濂孙壮宋雪峰张鹏姚钰宸
Owner SHANGHAI JIAO TONG UNIV
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