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Graphene doped ws 2 Preparation method and application in lithium/sodium ion battery

A graphene, WS2 technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficulty in obtaining nanostructures, battery performance does not reach expected results, etc., achieve excellent mechanical properties, inhibit volume expansion, and large specific surface area. Effect

Active Publication Date: 2021-11-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Preparation of graphene and WS 2 Composite materials and using them as electrode materials have become a recent research hotspot, but the battery performance obtained in these researches has not reached the expected results. The main reason should be attributed to the difficulty in obtaining nanostructures by conventional hydrothermal methods.

Method used

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  • Graphene doped ws <sub>2</sub> Preparation method and application in lithium/sodium ion battery
  • Graphene doped ws <sub>2</sub> Preparation method and application in lithium/sodium ion battery
  • Graphene doped ws <sub>2</sub> Preparation method and application in lithium/sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A graphene-doped WS 2 The preparation method is characterized in that, comprises the following steps:

[0045] Step 1. Add 150mg of graphene oxide and 0.18g of CTAB into 40ml of deionized water, and sonicate in an ice bath for 1 hour to obtain a mixed solution of graphene oxide;

[0046] Step 2. Add 1.983g tungsten hexachloride and 3.757g thioacetamide to the graphene oxide mixed solution obtained in step 1 to obtain mixed solution A; then use ammonia or hydrochloric acid to adjust the pH of mixed solution A to 7, and Ultrasound in an ice bath for 30 minutes to mix evenly to obtain a mixture B;

[0047] Step 3. Transfer the mixed solution B obtained in step 2 to a polytetrafluoroethylene-lined autoclave for hydrothermal reaction. The reaction temperature is 180°C, and the reaction time is 24h. After the reaction, cool naturally to room temperature and take out , separated, and the product obtained was washed and dried;

[0048] Step 4. Put the powder obtained after w...

Embodiment 2

[0053] A nanoporous microspherical WS 2 The preparation method comprises the following steps:

[0054] Step 1. Add 0.18g CTAB to 40ml deionized water, and sonicate in an ice bath for 1 hour to obtain a CTAB solution;

[0055] Step 2. Add 1.983g of tungsten hexachloride and 3.757g of thioacetamide to the CTAB solution obtained in step 1 to obtain a mixed solution A; then use ammonia or hydrochloric acid to adjust the pH of the mixed solution A to 7, and place in an ice bath Ultrasound for 30 minutes to mix evenly to obtain mixed solution B;

[0056] Step 3. Transfer the mixed solution B obtained in step 2 to a polytetrafluoroethylene-lined autoclave for hydrothermal reaction. The reaction temperature is 180°C, and the reaction time is 24h. After the reaction, cool naturally to room temperature and take out , separated, and the product obtained was washed and dried;

[0057] Step 4. Put the powder obtained after washing and drying in step 3 into an annealing furnace for gradi...

Embodiment 3

[0062] The difference between this example and Example 1 is: the CTAB added in step 1 is 0.08 g, and the pH of the mixed liquid A is adjusted to 5 in step 2; the rest of the steps are the same as in Example 1.

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Abstract

A Planar Nanohoneycomb Graphene-doped WS 2 The preparation method and the application in lithium or sodium ion battery negative electrode belong to the technical field of functional materials. The present invention obtains regular microspherical WS composed of nanopores by optimizing parameters such as the reactant and the amount of cetyltrimethylammonium bromide added. 2 ; On this basis, by graphene doping WS 2 , WS of spherical morphology 2 Improved to planar nano-honeycomb morphology, the obtained graphene-doped WS 2 It has the characteristics of large specific surface area, strong conductivity, excellent mechanical properties and stable structure. It is an excellent negative electrode material when used in lithium-ion or sodium-ion batteries, which greatly improves the performance of the batteries.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to a graphene-doped WS 2 The preparation method and the application in lithium or sodium ion battery negative electrode. Background technique [0002] WS 2 It is a typical transition metal disulfide, with S-W-S covalent bonding force in the layer, van der Waals force between layers, and large interplanar spacing, which is conducive to the diffusion of metal ions in the matrix. It is an excellent choice for lithium-ion batteries and sodium-ion batteries. ideal anode material. Studies have shown that theoretically 1mol WS 2 It can accommodate 4mol electrons, and the lithium storage capacity can reach 433mAhg -1 , higher than graphite's 372mAhg -1 . However, pure WS 2 As an electrode material, there are defects such as easy agglomeration, poor conductivity, and volume expansion. Therefore, doping carbon materials with good electrical conductivity and high mechanica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525H01M10/054B82Y30/00
CPCB82Y30/00H01M4/362H01M4/5815H01M4/625H01M4/628H01M10/0525H01M10/054Y02E60/10
Inventor 廖家轩吴孟强徐自强宋尧琛巩峰冯婷婷王思哲陈诚
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA