Lithium-ion battery composite negative electrode material vanadium trioxide/graphene and preparation method

A vanadium trioxide, lithium-ion battery technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problem that the lithium storage and sodium storage properties of nanoparticles cannot be well used, and graphene cannot be fully used. Inhibition, material agglomeration and conductivity, etc., to achieve the effects of stable Coulomb efficiency, good cycle stability and wide applicability

Active Publication Date: 2021-06-18
CENT SOUTH UNIV
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Problems solved by technology

However, V 2 o 3 There are also certain defects in the material: although the V in the nano state 2 o 3 The material has a high specific surface area, which is beneficial to improve the electrochemical performance of the material, however, the nano-state V 2 o 3 The material is easy to agglomerate and has poor conductivity, which is not conducive to industrial application
At the same time, it is vulnerable to structural damage caused by the stress generated during the lithium ion deintercalation process during the electrochemical cycle.
[0004] CN 104009215 A and CN 107916066 A disclose the preparation and research of vanadium dioxide / graphene composites. Graphene is used to improve the conductivity of vanadium dioxide, although it can inhibit the material from charging and discharging to a certain extent. The volume expansion of the material, however, due to the incomplete coating of the material by graphene, the inhibition effect of graphene on the volume expansion of the material cannot be perfectly exerted
[0005] CN 107658454 A discloses vanadium diselenide / graphene nanosheets, a negative electrode material for sodium-ion batteries, and a preparation method thereof. Although the graphene therein has a good coating on vanadium diselenide, due to the particles formed in the hydrothermal process Larger, unable to better play the good lithium and sodium storage properties of nanoparticles

Method used

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  • Lithium-ion battery composite negative electrode material vanadium trioxide/graphene and preparation method
  • Lithium-ion battery composite negative electrode material vanadium trioxide/graphene and preparation method
  • Lithium-ion battery composite negative electrode material vanadium trioxide/graphene and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040](1) Add 3mmol of ammonium metavanadate (350.94mg) into 40mL of a mixed solution of water and ethylene glycol (the volume ratio of water and ethylene glycol is 1:35), heat to 60°C, and turn at 500 rpm , keep stirring until dissolved to obtain solution A;

[0041] (2) Add 80 mg of graphene oxide into the solution A obtained in step (1), and then ultrasonicate for 4 hours at 300W until the graphene oxide is uniformly dispersed to obtain liquid B;

[0042] (3) Heat the liquid B obtained in step (2), conduct a hydrothermal reaction at 180°C for 4 hours, wash with absolute ethanol for 3 times, centrifuge at 8000 rpm, and dry at 80°C for 18 hours to obtain Precursor;

[0043] (4) Heat the precursor obtained in step (3) to 400°C at a speed of 5°C / min in a hydrogen / argon gas mixture (the volume fraction of hydrogen is 5%), and keep it warm for 4 hours to obtain a lithium-ion battery composite negative electrode material Vanadium trioxide / graphene.

[0044] Such as figure 1 As...

Embodiment 2

[0052] (1) Add 2 mmol of vanadyl acetylacetonate (530.30 mg) into 50 mL of a mixed solution of water and ethylene glycol (the volume ratio of water and ethylene glycol is 1:30), heat to 70 ° C, and turn at 430 rpm , keep stirring until dissolved to obtain solution A;

[0053] (2) Add 53mg of graphene oxide into the solution A obtained in step (1), and then ultrasonicate for 4.5 hours at 350W until the graphene oxide is uniformly dispersed to obtain liquid B;

[0054] (3) Heat the liquid B obtained in step (2), conduct a hydrothermal reaction at 200°C for 10 hours, wash with absolute ethanol for 4 times, centrifuge at 6300 rpm, and dry at 70°C for 12 hours to obtain Precursor;

[0055] (4) Heat the precursor obtained in step (3) to 500°C at a rate of 6°C / min in hydrogen / nitrogen mixed gas (the volume fraction of hydrogen is 6%), and keep it warm for 6 hours to obtain a lithium-ion battery composite negative electrode material Vanadium trioxide / graphene.

[0056] After testin...

Embodiment 3

[0064] (1) Add 6mmol of vanadium acetylacetonate (2089.62mg) into 70mL of a mixed solution of water and ethylene glycol (the volume ratio of water and ethylene glycol is 1:40), heat to 80°C, and at 800 rpm, Stir continuously until dissolved to obtain solution A;

[0065] (2) Add 626.8 mg of graphene oxide into the solution A obtained in step (1), and then ultrasonicate for 5 hours at 500W until the graphene oxide is uniformly dispersed to obtain liquid B;

[0066] (3) Heat the liquid B obtained in step (2), conduct a hydrothermal reaction at 220°C for 10 hours, wash with absolute ethanol 4 times, centrifuge at 6500 rpm, and dry at 75°C for 18.5 hours, get the precursor;

[0067] (4) Heat the precursor obtained in step (3) to 550°C at a speed of 7°C / min in hydrogen / nitrogen mixed gas (the volume fraction of hydrogen is 7%), and keep it warm for 6.5 hours to obtain a lithium-ion battery composite negative electrode Materials Vanadium trioxide / graphene.

[0068] After testing,...

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Abstract

Lithium-ion battery composite negative electrode material vanadium trioxide / graphene and its preparation method. The vanadium trioxide / graphene is made by the following method: (1) adding vanadium source into an oxidation solvent, heating and stirring continuously until dissolved , to obtain solution A; (2) Add graphene oxide into solution A, and then ultrasonically disperse graphene oxide uniformly to obtain liquid B; (3) heat, perform hydrothermal reaction, wash, centrifuge, and dry to obtain a precursor; (4) Carry out heat treatment under reducing atmosphere, and it is ready. In the vanadium trioxide / graphene composite negative electrode material of the lithium ion battery of the present invention, the vanadium trioxide is a nano particle with a particle diameter of 100 to 200 nm anchored on the surface of the graphene, and the vanadium trioxide is a pure phase; the assembled lithium The ion battery has high specific capacity and excellent cycle stability, and has remarkable economic value; the method of the invention is simple in operation, low in cost, strong in controllability and good in repeatability, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to a lithium ion battery composite negative electrode material and a preparation method thereof, in particular to a lithium ion battery composite negative electrode material vanadium trioxide / graphene and a preparation method thereof. Background technique [0002] As an efficient energy storage device, lithium-ion batteries have been applied to many small portable devices (such as mobile phones, digital cameras, notebook computers, etc.), electric vehicles, hybrid vehicles, aviation, aerospace and other fields, and to intelligent Grid and renewable energy large-scale energy storage system expansion. However, with the increasing demand for lithium-ion batteries, it is imminent to develop low-cost, high-capacity lithium-ion battery systems. Since the energy storage and conversion in lithium-ion batteries occur in the positive and negative electrode materials, only by developing electrode materials with stable detachment / intercalati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/48H01M4/583H01M10/0525Y02E60/10
Inventor 郑俊超肖彬汤林波安长胜贺振江
Owner CENT SOUTH UNIV
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