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Molybdenum disulfide/carbon composite material and preparation method and application thereof

A carbon composite material, molybdenum disulfide technology, applied in the direction of secondary batteries, electrochemical generators, active material electrodes, etc., can solve the problems of poor cycle stability, limited commercial development, and does not consider the impact of C shell, etc., to achieve Realize the effect of the number of layers

Inactive Publication Date: 2018-05-29
BEIJING EURO & AMERICAN INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simple MoS prepared by conventional hydrothermal method 2 The lithium storage capacity can reach 900mAh / g, but it has extremely poor cycle stability. It will be reduced to less than 300mAh / g after 20 cycles at a current density of 0.1A / g, which greatly limits MoS. 2 Commercial development in the field of lithium-ion batteries
However, this invention also does not consider the impact of the number of layers of the C shell on the performance of the composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] Electrode preparation:

[0048] Mix the molybdenum disulfide / carbon composite material obtained in the example with carbon black and polyvinylidene fluoride in a weight ratio of 7:1.5:1.5, and then mix it with nitrogen methyl pyrrolidone solution, and use nitrogen methyl pyrrolidone to adjust the viscosity of the slurry , and then evenly smear the slurry on the alcohol-cleaned copper foil with a spatula, vacuum-dry it at 120°C for 12 hours, and then press and cut it to prepare the research electrode.

[0049] Electrode performance test

[0050] Performance testing was performed in a coin cell lithium-ion battery. The battery assembly method is as follows:

[0051] Lithium sheet is used as the counter electrode, Celgard2300 is used as the diaphragm, and the electrolyte contains 1M LiPF 6 EC-DEC-EMC (1:1:1) solution, LiPF 6 is lithium hexafluorophosphate, EC is ethylene carbonate, and EMC is methyl ethyl carbonate. During the test, the temperature is room temperature...

Embodiment 1

[0053] Add 0.1 g of 3-AP, 0.1 mL of formaldehyde and aqueous ammonia to 30 mL of H 2 O, stir well. After stirring for 0.5 h, 20 mL of acetone was added to the obtained solution, then centrifuged, washed, dried, ground, and calcined at 1200 °C for 2 h in Ar gas to obtain single-layer C hollow sphere powder.

[0054] Take 0.2 g of the prepared single-layer C hollow sphere powder and disperse it in 40 mL of deionized water to obtain a uniform suspension. Add 0.2 g of ammonium molybdate and 0.2 g of thiourea to the obtained suspension, stir for 1 h, and then ultrasonically disperse for 0.5 h. After the suspension was transferred to the reactor, it was placed in a thermostat at 200°C for a hydrothermal reaction for 24 hours; the suspension after the hydrothermal reaction was centrifuged, washed, dried, and ground to obtain MoS 2 / C powder.

[0055] After testing, the first lithium intercalation capacity of the obtained product is 1035mAh / g, the reversible delithiation capacity is...

Embodiment 2

[0058] Add 0.15g 3-AP, 0.15mL formaldehyde and ammonia water to 45mLH 2 O, stir well. After stirring for 0.5 h, 30 mL of acetone was added to the obtained solution, then centrifuged, washed, dried, ground, and calcined at 1200 °C for 2 h in Ar gas to obtain double-layer C hollow sphere powder.

[0059] Take 0.2 g of the prepared double-layer C hollow sphere powder and disperse it in 40 mL of deionized water to obtain a uniform suspension. Add 0.2 g of ammonium molybdate and 0.2 g of thiourea to the obtained suspension, stir for 1 h, and then ultrasonically disperse for 0.5 h. After the suspension was transferred to the reactor, it was placed in a thermostat at 200°C for a hydrothermal reaction for 24 hours; the suspension after the hydrothermal reaction was centrifuged, washed, dried, and ground to obtain MoS 2 / C powder.

[0060] After testing, the first lithium intercalation capacity of the obtained product is 1045mAh / g, the reversible delithiation capacity is 892mAh / g, an...

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PUM

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Abstract

The invention provides a molybdenum disulfide / carbon composite material and a preparation method and application thereof. The preparation method comprises the following steps: taking water as a solvent at first; adding p-aminophenol, formaldehyde and ammonia water to prepare multilayered C hollow balls; regulating the amount of the water, 3-AP, the formaldehyde and the ammonia water to regulate and control the number of the layers of the C hollow balls; taking the synthesized C hollow balls as a framework, taking ammonium molybdate as a molybdenum source, taking thiourea as a sulfur source, and using a hydrothermal method to obtain a MoS2 / C composite material. The preparation method is simple, safe in preparation process, low in energy consumption and high in operability.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a molybdenum disulfide / carbon composite material and its preparation method and application. Background technique [0002] Lithium-ion batteries (LIBs) are considered to be the most promising energy storage devices in portable electronics and electric vehicles, where electrode materials have a significant impact on their performance. Although the conventional graphite anode has been commercialized, its capacity is very low (372mA h g -1 ), which largely limits its practical application in portable electronics and electric vehicles. In addition, due to the severe volume expansion of LIB anode materials during the long-term charge-discharge process, the material is severely broken, resulting in irreversible capacity loss and reduced cycle stability. Therefore, the cycle performance, rate performance, and safety performance of LIBs need to be further improved. [0...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/0525
CPCH01M4/366H01M4/5815H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 张成如
Owner BEIJING EURO & AMERICAN INST OF SCI & TECH
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