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Preparation method of graphene/molybdenum disulfide nanosphere/carbon black composite material

A technology of molybdenum disulfide and composite materials, which is applied in the field of nanomaterials and energy storage, can solve the problems of not fully utilizing the conductivity of graphene, poor conductivity of molybdenum disulfide, and no stable structure, and achieves excellent cycle stability and low cost. Inexpensive, performance-boosting effects

Active Publication Date: 2019-09-06
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As pointed out in CN201610602167.4 "A Method for Preparation of Molybdenum Disulfide Nanosheet / Graphene Lithium Battery Negative Material", the method of uniformly dispersing molybdenum disulfide powder and graphene powder by liquid phase physical method can overcome the poor conductivity of molybdenum disulfide , easy to push the shortcomings of stacking, but this method just physically mixes the two together, no stable structure is formed between the two, and the conductivity of graphene is not fully utilized
And David L et al. in "MoS 2 / graphene composite paper for sodium-ionbattery electrodes" (Acs Nano, 2014, 8(2): 1759-1770) used the suction filtration method to prepare molybdenum disulfide / graphene composite paper as a battery material, but this method is expensive and cannot Large-scale preparation

Method used

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  • Preparation method of graphene/molybdenum disulfide nanosphere/carbon black composite material
  • Preparation method of graphene/molybdenum disulfide nanosphere/carbon black composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Dissolve the graphene oxide powder in DMF according to the final mass concentration of 5wt%, mechanically stir for 30 minutes, and ultrasonicate for 100 minutes to uniformly disperse the graphene oxide to obtain liquid A;

[0032] 2. Mix ammonium tetrathiomolybdate and conductive carbon black according to the mass ratio of 3:1, mix them, place them in an agate ball mill jar, and mill them on a planetary ball mill at a speed of 1000 rpm for 1 hour to obtain powder B;

[0033]3. According to the mass ratio of powder B to graphene oxide powder being 1:0.05, powder B is added to liquid A, and the powder B is completely dissolved by stirring ultrasonically to obtain graphene / molybdenum disulfide nanospheres / Precursor solution C of carbon black composite material;

[0034] 4. Pour the precursor solution C into a three-necked flask, insert a thermometer into the mouth of the left end of the flask, connect the mouth of the middle of the flask to a condensing device, connect...

Embodiment 2

[0039] 1. Dissolve the graphene oxide powder in the mixed solution of NMP and DMAc (the mass ratio of NMP and DMAc is 2:1) according to the final mass concentration of 10wt%. After mechanical stirring for 5 minutes, ultrasonication for 50 minutes makes the graphene oxide evenly dispersed After that, liquid A is obtained;

[0040] 2. Mix ammonium tetrathiomolybdate and conductive carbon black according to the mass ratio of 4:1, mix them, place them in an agate ball mill jar, and mill them on a planetary ball mill at a speed of 1000 rpm for 30 minutes to obtain powder B;

[0041] 3. According to the mass ratio of powder B to graphene oxide powder being 1:0.3, powder B is added to liquid A, and the powder B is completely dissolved by stirring ultrasonically to obtain graphene / molybdenum disulfide nanospheres / Precursor solution C of carbon black composite material;

[0042] 4. Pour the precursor solution C into a three-necked flask, insert a thermometer into the mouth of the lef...

Embodiment 3

[0046] 1. Dissolve the graphene oxide powder in DMSO at a final mass concentration of 7.5wt%, mechanically stir for 18 minutes, and ultrasonicate for 60 minutes to uniformly disperse the graphene oxide to obtain Liquid A;

[0047] 2. Mix ammonium tetrathiomolybdate and conductive carbon black according to the mass ratio of 3.5:1, mix them, place them in an agate ball mill jar, and mill them on a planetary ball mill at a speed of 1000 rpm for 45 minutes to obtain powder B;

[0048] 3. According to the mass ratio of powder B to graphene oxide powder being 1:0.2, powder B is added to liquid A, and the powder B is completely dissolved by stirring ultrasonically to obtain graphene / molybdenum disulfide nanospheres / Precursor solution C of carbon black composite material;

[0049] 4. Pour the precursor solution C into a three-necked flask, insert a thermometer at the mouth of the left end of the flask, connect the condensing device to the mouth of the middle of the flask, connect the...

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Abstract

The invention relates to the technical field of nano-material and energy storage and is to provide a preparation method of a graphene / molybdenum disulfide nanosphere / carbon black composite material. The method comprises the following steps: mixing and ball milling ammonium tetrathiomolybdate and conductive carbon black, then, adding the obtained powders into polar organic solvent dispersion liquidof graphene oxide powders, and carrying out ultrasonic treatment while stirring to obtain a precursor solution; dropping a reductant into the precursor solution under constant-temperature heating andstirring, and after reaction, separating and collecting solid products; and carrying out washing and drying, and then, carrying out calcination in an inert atmosphere to obtain the graphene / molybdenum disulfide nanosphere / carbon black composite material finally. Through reductant reduction and heat treatment, high-quality graphene is obtained; the graphene is dispersed evenly in the composite material, so that the specific surface area of the final product is large, and conductivity is high; the composite material has the advantages of high specific capacity, excellent cycling stability and good rate capability; and the method is high in preparation efficiency, simple in process, low in cost and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and energy storage, in particular to a method for preparing a graphene / molybdenum disulfide nanosphere / carbon black composite material. Background technique [0002] With the continuous development of science and technology, more and more technology products require portable, safe and green energy storage batteries, and lithium-ion batteries have many advantages such as stable cycle, high energy density, low self-discharge rate, clean and pollution-free. Features, are widely used in mobile phones, notebook computers, power tools, electric vehicles and many other technological products. At present, the energy ratio of lithium-ion batteries has reached 200Wh / kg, which is 6-7 times that of lead-acid batteries. The operating temperature range is -20-60°C, and the charging efficiency is as high as 100%. able equipment. In the past ten years, in order to meet the increasing high-performance requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/362H01M4/5815H01M4/625H01M4/62H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 暴宁钟王顺何大方沈丽明
Owner NANJING UNIV OF TECH