Preparation method of lithium-ion battery negative electrode molybdenum disulfide and application thereof

A lithium-ion battery, molybdenum disulfide technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as reducing the efficiency of molybdenum disulfide, and achieve the effects of short time, multiple electron propagation channels, and strong practicability

Inactive Publication Date: 2018-01-12
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the van der Waals force between MoS2 layers and its high surface energy, the two-dimensional nanosheet structure of MoS2 will irreversibly overlap when it is put into practical application, thus greatly reducing the The efficiency of molybdenum disulfide in many fields

Method used

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  • Preparation method of lithium-ion battery negative electrode molybdenum disulfide and application thereof
  • Preparation method of lithium-ion battery negative electrode molybdenum disulfide and application thereof
  • Preparation method of lithium-ion battery negative electrode molybdenum disulfide and application thereof

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Experimental program
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Effect test

Embodiment 1

[0040] (1) Add 15 mL of deionized water to 0.3 g of sodium molybdate dihydrate and 0.6 g of thiourea. After the dissolution is complete, add 45 mL of diethylene glycol quickly, and stir vigorously in a water bath at 70°C until a homogeneous mixed solution is formed. Then, the mixed solution was put into a 100mL hydrothermal reactor, and the hydrothermal reaction was carried out at 200° C. for 24 hours;

[0041] (2) the above-mentioned hydrothermal reaction product is taken out and centrifuged, after removing the liquid part, centrifugal cleaning with deionized water and ethanol is used for 2 to 3 times, vacuum drying at 70 ° C for 12 hours, then in argon-hydrogen mixed gas (argon and hydrogen gas) A volume ratio of 95:5) was calcined at 400° C. for 2 hours to obtain molybdenum disulfide, a negative electrode for lithium ion batteries.

Embodiment 2

[0043] (1) Add 25 mL of deionized water to 0.3 g of sodium molybdate dihydrate and 0.6 g of thiourea, quickly add 35 mL of diethylene glycol after the dissolution is complete, and stir vigorously in a 70°C water bath until a homogeneous mixed solution is formed. Then, the mixed solution was put into a 100 mL hydrothermal reactor, and the hydrothermal reaction was carried out at 200° C. for 24 hours.

[0044] (2) the above-mentioned hydrothermal reaction product is taken out and centrifuged, after removing the liquid part, centrifugal cleaning with deionized water and ethanol is used for 2 to 3 times, vacuum drying at 70 ° C for 12 hours, then in argon-hydrogen mixed gas (argon and hydrogen gas) A volume ratio of 95:5) was calcined at 400° C. for 2 hours to obtain molybdenum disulfide, a negative electrode for lithium ion batteries.

Embodiment 3

[0046] (1) Add 30 mL of deionized water to 0.3 g of sodium molybdate dihydrate and 0.6 g of thiourea, quickly add 30 mL of diethylene glycol after complete dissolution, and stir vigorously in a 70°C water bath until a homogeneous mixed solution is formed. Then, the mixed solution was put into a 100 mL hydrothermal reactor, and the hydrothermal reaction was carried out at 200° C. for 24 hours.

[0047](2) the above-mentioned hydrothermal reaction product is taken out and centrifuged, after removing the liquid part, centrifugal cleaning with deionized water and ethanol is used for 2 to 3 times, vacuum drying at 70 ° C for 12 hours, then in argon-hydrogen mixed gas (argon and hydrogen gas) A volume ratio of 95:5) was calcined at 400° C. for 2 hours to obtain molybdenum disulfide, a negative electrode for lithium ion batteries.

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Abstract

The invention discloses a preparation method of lithium-ion battery negative electrode molybdenum disulfide and the application thereof. The preparation method comprises the following steps: mixing sodium molybdate dehydrate, thiourea, water and diethylene glycol to carry out a hydrothermal reaction, separating the product after the hydrothermal reaction, performing calcination treatment on the separated solids in argon-hydrogen mixed gas, and finally cooling to a room temperature, so as to obtain the lithium-ion battery negative electrode material molybdenum disulfide. According to the preparation method disclosed by the invention, the hydrolysis rate of the thiourea is reduced by adding the diethylene glycol, so that the aim of controlling the reaction rate of sodium molybdate is achieved. Two-dimensional molybdenum disulfide nanosheets are assembled into a three-dimensional layered flower structure, so that the specific advantages of the molybdenum disulfide can be preserved, the condition that the molybdenum disulfide is irreversibly overlapped can be avoided, and a larger contact area is provided.

Description

technical field [0001] The invention relates to the technical field of electrode material preparation, in particular to a preparation method and application of molybdenum disulfide as a negative electrode of a lithium ion battery. Background technique [0002] Lithium-ion batteries have many advantages, such as high energy density, high specific power, and long cycle life. With the depletion of fossil energy and the intensification of the global greenhouse effect, many problems and challenges follow, and people's demand for clean and non-polluting clean energy is gradually increasing, and the use of nano-functional materials to build storage devices to meet more efficient energy conversion has profound meaning. [0003] The performance of electrochemical energy devices mainly depends on the efficient insertion of electrons and ions. Therefore, a large number of researches are now devoted to designing a simple nanomaterial to improve the electrochemical response. With the a...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/136H01M4/1397H01M4/04H01M10/0525
CPCY02E60/10
Inventor 刘钰旻夏宇江云
Owner JIANGHAN UNIVERSITY
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