Method for improving charge-discharge cycling capacity of molybdenum disulfide by doping graphene and titanium dioxide

A technology of titanium dioxide and molybdenum disulfide, which is applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems that the discharge specific capacity needs to be further improved and needs to be further improved, and achieve improved cycle performance, volume change suppression, and contact area. big effect

Active Publication Date: 2015-12-16
JILIN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

As in the prior art ""Facilesynthesisofcarbon-coatedMoS 2 nanorodswithenhancedlithiumstorageproperties", Chaofeng Zhangetal., Electrochem.Commun.20 (2012) 7-10" mentioned that "the discharge specific capacity of molybdenum disulfide after carbon coating has been significantly improved, and it can be cycled for 80 cycles at a current density of 200 milliamperes per gram After that, it can provide a specific discharge capacity of 621 mAh per gram, but the cycle stability needs to be further improved.
As in prior art ""CTAB-assistedsynthesisofsingle-layerMoS 2 -graphenecompositesasanodematerialsofLi-ionbatteries", ZhenWang etal., JMater.Chem.1 (2013) 2202-2210 ", publication number is mentioned in the Chinese patent of CN103904334A " in molybdenum disulfide / graphene composite material, graphene reduces contact resistance, promotes the electron transfer in the electrode reaction", however, the discharge specific capacity needs to be further improved

Method used

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  • Method for improving charge-discharge cycling capacity of molybdenum disulfide by doping graphene and titanium dioxide
  • Method for improving charge-discharge cycling capacity of molybdenum disulfide by doping graphene and titanium dioxide
  • Method for improving charge-discharge cycling capacity of molybdenum disulfide by doping graphene and titanium dioxide

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Embodiment 1

[0023] (1) Preparation of fibrous titanium dioxide by electrospinning: 3 ml of titanium tetraisopropoxide, 2 ml of acetic acid, 0.3 g of polyvinylpyrrolidone and absolute ethanol were mixed, and the oscillator oscillated for 1440 minutes; 1. Spinning under the condition of 1 milliliter of advancing speed per hour and 10 centimeters of receiving distance; standing for 1440 minutes, then roasting for 360 minutes at 510 degrees centigrade in an air atmosphere to obtain fibrous titanium dioxide;

[0024] The polyvinylpyrrolidone can be replaced by polyethylene glycol, cetyltrimethylammonium bromide or sodium dodecylbenzenesulfonate.

[0025] (2) Dissolve 0.024 g of graphite oxide in 30 ml of deionized water, ultrasonicate for 30 minutes, add titanium dioxide and sodium molybdate or ammonium molybdate, stir for 5 minutes, then add thiourea, and stir for 5 minutes.

[0026] (3) Transfer the above solution to a reaction kettle for hydrothermal reaction at 200 degrees Celsius for 1440...

Embodiment 2

[0030] (1) Preparation of fibrous titanium dioxide by electrospinning: 0.5 ml of titanium tetraisopropoxide, 0.4 ml of acetic acid, 0.05 g of polyvinylpyrrolidone and absolute ethanol were mixed, and the oscillator oscillated for 720 minutes; , 0.1 milliliters of per hour advancing speed and spinning under the condition of 4 centimeters of receiving distances; Stand still for 720 minutes, then roast under 400 degrees centigrade air atmosphere for 120 minutes, obtain fibrous titanium dioxide;

[0031] The polyvinylpyrrolidone can be replaced by polyethylene glycol, cetyltrimethylammonium bromide or sodium dodecylbenzenesulfonate.

[0032] (2) Dissolve 0.01 g of graphite oxide in 10 ml of deionized water, ultrasonicate for 15 minutes, add titanium dioxide and sodium molybdate or ammonium molybdate, stir for 2 minutes, then add thiourea, and stir for 2 minutes.

[0033] (3) Transfer the above solution to a reaction kettle for hydrothermal reaction at 150 degrees Celsius for 720 m...

Embodiment 3

[0036] (1) Preparation of fibrous titanium dioxide by electrospinning: 1 ml of titanium tetraisopropoxide, 0.8 ml of acetic acid, 0.1 g of polyvinylpyrrolidone and absolute ethanol were mixed, and the oscillator oscillated for 960 minutes; , 0.4 milliliters of per hour advancing speed and spinning under the condition of 6 centimeters of receiving distances; Stand still for 960 minutes, then roast 180 minutes under 450 degrees centigrade air atmosphere, obtain fibrous titanium dioxide;

[0037] The polyvinylpyrrolidone can be replaced by polyethylene glycol, cetyltrimethylammonium bromide or sodium dodecylbenzenesulfonate.

[0038] (2) Dissolve 0.015 g of graphite oxide in 15 ml of deionized water, ultrasonicate for 20 minutes, add titanium dioxide and molybdenum or sodium ammonium molybdate or ammonium molybdate, stir for 3 minutes, then add thiourea, and stir for 3 minutes.

[0039] (3) Transfer the above solution to a reaction kettle for hydrothermal reaction at 160 degrees ...

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Abstract

The invention discloses a method for improving the charge-discharge cycling capacity of molybdenum disulfide by doping graphene and titanium dioxide. According to a molybdenum disulfide / titanium dioxide / graphene composite, graphene is adopted as a conductive modified phase, and titanium dioxide is adopted as a support and collaborative phase, so that the charge-discharge cycling performance of the composite is enhanced. Sodium molybdate, thiourea, graphite oxide, titanium tetraisopropoxide, absolute ethyl alcohol, acetic acid, polyvinylpyrrolidone and deionized water are selected, and after electrostatic spinning and a hydrothermal reaction, the molybdenum disulfide / titanium dioxide / graphene composite is obtained through vacuum drying. The production process is simple, cost is low, and the prepared molybdenum disulfide / titanium dioxide / graphene composite has excellent electrochemical performance.

Description

technical field [0001] The invention relates to a method for preparing a nanocomposite material, in particular to a method for improving the charge-discharge cycle capability of molybdenum disulfide by doping graphene and titanium dioxide, and belongs to the technical field of advanced nanocomposite material preparation technology. Background technique [0002] Since Japan's Sony Corporation commercialized lithium-ion batteries in the 1990s, lithium-ion batteries have become popular in mobile phones, notebook computers, Ideal power supply for digital cameras, video cameras, electric vehicles, hybrid vehicles and various portable instruments. In lithium-ion batteries, the positive electrode material and negative electrode material, which are lithium storage materials, are the main components of the battery and play a decisive role in its electrochemical performance. [0003] At present, graphite is widely used as an anode material for commercial lithium-ion batteries, thanks...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/139
CPCH01M4/139H01M4/362H01M4/5815H01M4/625Y02E60/10
Inventor 金波钟晓斌郎兴友朱永福高旺杨春成文子李建忱赵明于开锋蒋青
Owner JILIN UNIV
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