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A kind of preparation method of tungsten trioxide/graphene composite negative electrode material

A technology of negative electrode material and mixed solution, which is applied in the field of preparation of WO3/RGO composite negative electrode materials, can solve the problems of large particle size of composite materials, great influence on electrochemical performance, and low content of tungsten in composite materials, and achieve uniform and fine particles , good electrochemical performance, and less volume change

Active Publication Date: 2020-08-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are also WO in the relevant literature records 3 / RGO composite material synthesis method, they use relatively expensive tungsten chloride and graphene oxide to react, but the cost of the composite material prepared by this method is relatively high, and the hexavalent tungsten in tungsten chloride is not easy to adsorb to graphite On the surface of olefin, the adsorption force is relatively poor, and it is easy to fall off. The obtained composite material has a relatively small tungsten content and poor electrochemical performance; in addition, the particle size of the composite material obtained by this method is relatively large, and the volume change is relatively large during the charging and discharging process. , it is easy to cause the collapse of the structure, which has a great influence on the electrochemical performance, so it cannot be used as a negative electrode material

Method used

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  • A kind of preparation method of tungsten trioxide/graphene composite negative electrode material
  • A kind of preparation method of tungsten trioxide/graphene composite negative electrode material
  • A kind of preparation method of tungsten trioxide/graphene composite negative electrode material

Examples

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Effect test

Embodiment 1

[0024] WO described in this example 3 The preparation method of / RGO composite negative electrode material specifically comprises the following steps:

[0025] (1) Mix 200mg of ammonium metatungstate and 20mg of RGO (mass ratio is 10:1), then add it to 10mL of 1mol / L dilute hydrochloric acid and 60mL of diethylene glycol to prepare a mixed solution, and use ultrasonic vibration (oscillation frequency 40KHZ) to disperse the solution for 50 minutes, transfer the solution to a reaction kettle with a polytetrafluoroethylene liner, heat it to 140°C for 18 hours, and cool it down to room temperature naturally.

[0026] (2) Pour out the mixture in the reaction kettle, filter it, wash the precipitate several times with deionized water and alcohol, and dry it in a drying oven at 40°C for 24 hours.

[0027] (3) Place the dried powder in step (2) in a microwave oven, rapidly heat it up to 400°C at a heating rate of 5°C / min, keep it warm for 100 minutes, and cool it down to room tempera...

Embodiment 2

[0033] WO described in this example 3 The preparation method of / RGO composite negative electrode material specifically comprises the following steps:

[0034] (1) Take 300mg of ammonium metatungstate and mix 20mg of RGO (mass ratio is 15:1), then add it to 10mL of 1mol / L dilute hydrochloric acid and 100mL of diethylene glycol to prepare a mixed solution, and use ultrasonic vibration (oscillation frequency 40KHZ) to disperse the solution for 30 minutes, transfer the solution to a reaction kettle with a polytetrafluoroethylene liner, heat it to 180°C for 24 hours, and cool it down to room temperature naturally.

[0035] (2) Pour out the mixture in the reaction kettle, filter, wash the precipitate several times with deionized water and alcohol, and dry it in a drying oven at 45°C for 24 hours.

[0036] (3) Place the dried powder in step (2) in a microwave oven, rapidly heat it up to 500°C at a heating rate of 9°C / min, keep it warm for 120 minutes, and cool it down to room temp...

Embodiment 3

[0042] WO described in this example 3 The preparation method of / RGO composite negative electrode material specifically comprises the following steps:

[0043] (1) Take 400mg of ammonium metatungstate and mix 20mg of RGO (mass ratio is 20:1), then add it to 10mL of 1mol / L dilute hydrochloric acid and 120mL of diethylene glycol to prepare a mixed solution, and use ultrasonic vibration (oscillation frequency 40KHZ) to disperse the solution for 30 minutes, transfer the solution to a reaction kettle with a polytetrafluoroethylene liner, heat it to 180°C for 30 hours, and cool it down to room temperature naturally.

[0044] (2) Pour out the mixture in the reaction kettle, filter, wash the precipitate several times with deionized water and alcohol, and dry it in a drying oven at 45°C for 24 hours.

[0045] (3) Put the dried powder in step (2) in a microwave oven, rapidly heat it up to 550°C at a heating rate of 10°C / min, keep it warm for 120 minutes, and cool it down to room tempe...

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Abstract

The invention discloses a preparation method for a WO3 / RGO composite anode material and belongs to the technical field of a lithium ion battery. According to the method provided by the invention, ammonium metatungstate, RGO and diluted hydrochloric acid are added to diethylene glycol to prepare mixed solution, and vibration and dispersion are carried out through utilization of an ultrasonic generator; the obtained mixed solution is transferred to a reactor with a polytetrafluoroethylene liner, then the mixed solution is naturally cooled to room temperature, the mixed solution is taken out forfiltering, washing and drying, and then black powder is obtained; and the black powder is calcined for certain period of time, and then the black powder is naturally cooled to the room temperature toobtain the black WO3 / RGO composite material. The WO3 / RGO composite material prepared by the method has the advantages of low granularity, uniformity and the like. In an electrochemical test, the WO3 / RGO composite material shows excellent electrochemical performance.

Description

technical field [0001] The present invention relates to a WO 3 The invention discloses a method for preparing a / RGO composite negative electrode material, belonging to the technical field of lithium ion batteries. Background technique [0002] In recent years, batteries have played an increasingly important role in modern society. As a clean and environmentally friendly electrochemical energy storage device, the development and application of lithium-ion batteries play a pivotal role in alleviating the current problems of fossil energy depletion and environmental pollution. However, looking at the development of lithium-ion batteries in the past few decades, the research hotspot is still to explore and develop high-performance, high-safety, and low-cost electrode materials. So far, the positive electrode materials that have been industrialized include LiCoO 2 , LiMn 2 o 4 、LiFePO 4 Wait. However, although the current graphite materials can no longer meet the needs of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525
CPCH01M4/362H01M4/48H01M4/583H01M10/0525Y02E60/10
Inventor 张正富任艳昆刘警峰范苏晓徐嘉辉
Owner KUNMING UNIV OF SCI & TECH
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