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Vanadium disulfide-vanadium tetrasulfide nano material with lamellar self-assembly structure, preparation method thereof and rechargeable battery with excellent rate capability

A nanomaterial, vanadium disulfide technology, applied in the field of making rechargeable batteries, can solve the problems that the active material cannot be fully contacted with the electrolyte, the performance cannot be fully utilized, and the discharge capacity is unstable. Low cost and the effect of improving charge and discharge efficiency

Pending Publication Date: 2022-06-24
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are still some problems in Al-ion batteries, such as the active material cannot fully contact with the electrolyte, capacitive behavior without a stable discharge voltage plateau, very low discharge voltage, poor reversibility and thus low Coulombic efficiency, after several cycles The post-sharp attenuation, low, unstable discharge capacity, limited cycle life, and structural decomposition and volume expansion due to the intercalation of large-sized intercalation products, all of these factors lead to poor electrochemical performance, and its performance cannot be fully utilized

Method used

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  • Vanadium disulfide-vanadium tetrasulfide nano material with lamellar self-assembly structure, preparation method thereof and rechargeable battery with excellent rate capability
  • Vanadium disulfide-vanadium tetrasulfide nano material with lamellar self-assembly structure, preparation method thereof and rechargeable battery with excellent rate capability
  • Vanadium disulfide-vanadium tetrasulfide nano material with lamellar self-assembly structure, preparation method thereof and rechargeable battery with excellent rate capability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] A lamellar self-assembled structure VS 2 @VS 4 The method for preparing nanomaterials includes the following steps:

[0124] 1) Put 0.4212g NH 4 VO 3 Disperse in 30 mL of water in a 60°C hot water bath, stir vigorously, with a stirring speed of 800 rpm and a time of 0.5 h, to dissolve it to form a mixed solution;

[0125]2) Add 0.03mol of thioacetamide (TAA) into step 1), stir, the stirring speed is 600rpm, and the time is 1h to form a mixed solution, and 3.6mL of concentrated ammonia water with a mass concentration of 25% is transferred into the mixed solution. Stir, the stirring time is 1h under the condition of 800rpm, the solution is transferred to a 50mL polytetrafluoroethylene reaction kettle for hydrothermal reaction, the reaction is 180°C, the reaction time is 8h, the reaction is over, and the centrifugal washing is performed at 8000r and the time is 1min; Washed 6 times with water and 2 times with ethanol, and dried at 60 °C for 12 h to obtain VS 2 Nanoshe...

Embodiment 2

[0130] A rechargeable battery with excellent rate performance, using the above-mentioned lamellar self-assembly structure VS 2 @VS 4 Nanomaterials are used as active materials to prepare aluminum-ion battery cathodes, and then to prepare rechargeable aluminum-ion batteries.

[0131] Specifically: the lamella self-assembled structure VS prepared based on Example 1 2 @VS 4 Nanomaterials are used as active substances, and the rose-shaped VS prepared based on Example 1 will be 2 The nanosheet material is used as the active material of the comparative material. The above two active materials are uniformly mixed with conductive carbon black and PVDF according to the ratio of 7:2:1, and magnetically stirred for 8 hours to uniformly disperse them in NMP. The slurry was coated on carbon paper with a coater, placed in a vacuum drying oven at 80 °C, dried for 24 hours, and pressed with a tablet machine, and then cut into a small circular shape with a tablet machine. electrode sheet; ...

Embodiment 3

[0136] A lamellar self-assembled structure VS 2 @VS 4 The method for preparing nanomaterials includes the following steps:

[0137] 1) Put 0.4212g NH 4 VO 3 Disperse in 30 mL of water in a 60°C hot water bath, stir vigorously with a stirring speed of 800 rpm and a time of 0.5 h to dissolve to form a mixed solution;

[0138] 2) Add 0.03mol of thioacetamide (TAA) into step 1), stir, the stirring speed is 600rpm, and the time is 1h to form a mixed solution, and 3.6mL of concentrated ammonia water with a mass concentration of 25% is transferred into the mixed solution. Stir, conduct magnetic stirring at 800 rpm for 1 h; transfer the solution to a 50 mL polytetrafluoroethylene reaction kettle for hydrothermal reaction, react at 180 ° C, the reaction time is 12 h, the reaction is over, centrifugal washing, the rotation speed is 8000 r and the time is 1 min; first wash with water 6 times, washed with ethanol twice, drying temperature 60 ℃, time 12h, to obtain rose-shaped VS 2 Na...

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Abstract

The invention provides a vanadium disulfide and vanadium tetrasulfide nanometer material with a lamellar self-assembly structure, a preparation method thereof and a rechargeable battery with excellent rate capability, firstly, rose-shaped VS2 nanosheets are prepared from raw materials with low price, and a VS2 and VS4 lamellar self-assembly structure nanometer material is obtained through a secondary hydrothermal method; the lamellar self-assembly structure VS2 (at) VS4 is a nanometer material with the thickness of a single layer of 100-400 nm, and the lamellar self-assembly structure VS2 (at) VS4 nanometer material is safe, environmentally friendly and low in price. According to the present invention, the product sheet layer self-assembly structure VS2atVS4 nanometer material provides more active sites during the charge-discharge process, the sheet layer structure has a large specific surface area, the formed three-dimensional laminated structure effectively solves the problem of large material volume change during the charge-discharge process, and the cycle capacity, the stability and the coulombic efficiency of the battery are improved;

Description

technical field [0001] The invention belongs to the technical field of battery positive electrode materials, and in particular relates to a lamellar self-assembled structure vanadium disulfide@vanadium tetrasulfide nanomaterial and a preparation method thereof, a rechargeable battery with excellent rate performance, and the prepared lamellar self-assembled structure VS 2 @VS 4 Nanomaterials are used as anode materials for aluminum-ion batteries to make rechargeable batteries. Background technique [0002] The growing energy crisis and environmental problems caused by the depletion of fossil fuels have greatly promoted the development of renewable energy and storage devices. Today, renewable energy devices, especially state-of-the-art lithium-ion batteries, are widely used in portable electronic devices, including cell phones, laptops, and wearables. Lithium-ion batteries are also considered to be the first choice for growing large-scale energy storage systems such as smart...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/054C01G31/00B82Y30/00B82Y40/00
CPCH01M4/366H01M4/5815H01M10/054C01G31/003B82Y30/00B82Y40/00H01M2004/028Y02E60/10
Inventor 韩阗俐王艳陈中和胡芸菲张雅雯刘金云
Owner ANHUI NORMAL UNIV
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