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Method for preparing titanium dioxide nanosheet coated graphene anode material of lithium ion battery

A graphene anode and lithium ion battery technology, applied in the field of electrochemical materials, can solve the problems of titanium dioxide electrochemical performance not reaching an ideal level, slow lithium ion diffusion rate, poor conductivity, etc., achieve good application development prospects, improve lithium storage. Specific capacity, the effect of preventing agglomeration

Inactive Publication Date: 2016-05-11
MCNAIR TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conductivity of titanium dioxide is poor, the diffusion rate of lithium ions is slow, and the particles of titanium dioxide are easy to agglomerate
Therefore, the electrochemical performance of titanium dioxide has not reached the ideal level.

Method used

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  • Method for preparing titanium dioxide nanosheet coated graphene anode material of lithium ion battery
  • Method for preparing titanium dioxide nanosheet coated graphene anode material of lithium ion battery
  • Method for preparing titanium dioxide nanosheet coated graphene anode material of lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1, the preparation method of titanium dioxide nanosheet coated graphene negative electrode material, comprises the following steps:

[0030] Graphite oxide was prepared by the hummer method, 30 mg of graphite oxide was sonicated in 30 mL of isopropanol for 4 hours with a 250 W ultrasonic instrument to form a graphene oxide suspension, then 0.02 mL of diethylenetriamine was added, stirred evenly, and 1.0 mL of titanic acid was added dropwise Butyl ester, stirred evenly, put into a 50mL reaction kettle, reacted at 180°C for 24 hours, washed the solvothermal reaction product with de-ethanol, dried, and treated at 500°C for 2 hours under a nitrogen atmosphere to obtain titanium dioxide nanosheet-coated graphite vinyl material.

[0031] The electrochemical performance test of the titanium dioxide nanosheet coated graphene material prepared in embodiment 1:

[0032] Mix the titanium dioxide nanosheet-coated graphene material prepared in Example 1 with conductive c...

Embodiment 2

[0038] Embodiment 2, the preparation method of titanium dioxide nanosheet coated graphene negative electrode material, comprises the following steps:

[0039]Graphite oxide was prepared by the hummer method, 25 mg of graphite oxide was sonicated in 30 mL of isopropanol for 4 hours with a 250 W ultrasonic instrument to form a graphene oxide suspension, then 0.025 mL of diethylenetriamine was added, stirred evenly, and 1.2 mL of titanic acid was added dropwise Butyl ester, stirred evenly, put into a 50mL reaction kettle, reacted at 180°C for 24 hours, washed the solvothermal reaction product with de-ethanol, dried, and treated at 500°C for 2 hours under a nitrogen atmosphere to obtain titanium dioxide nanosheet-coated graphite vinyl material.

[0040] The electrochemical performance test method of the titanium dioxide nanosheet coated graphene material prepared by embodiment 2 is the same as embodiment 1:

[0041] The XRD pattern of the material ( image 3 ) is attributed to t...

Embodiment 3

[0042] Embodiment 3, the preparation method of titanium dioxide nanosheet coated graphene negative electrode material, comprises the following steps:

[0043] Graphite oxide was prepared by the hummer method, 20 mg of graphite oxide was sonicated in 30 mL of isopropanol for 4 hours with a 250 W ultrasonic instrument to form a graphene oxide suspension, then 0.015 mL of diethylenetriamine was added, stirred evenly, and 1.0 mL of titanic acid was added dropwise Butyl ester, stirred evenly, put it into a 50mL reactor, reacted at 180°C for 24 hours, washed the solvothermal reaction product with ethanol, dried, and treated at 600°C for 2 hours under a nitrogen atmosphere to obtain titanium dioxide nanosheet-coated graphite vinyl material.

[0044] The electrochemical performance test of the titanium dioxide nanosheet coated graphene material prepared in embodiment 3:

[0045] Test method is identical with embodiment 1:

[0046] from Image 6 It can be seen that the material has ...

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Abstract

The invention provides a method for preparing a titanium dioxide nanosheet coated graphene anode material of a lithium ion battery. The method comprises the following steps: a, preparing graphene oxide suspension: preparing graphite oxide by adopting a hummer method, and ultrasonically peeling graphite oxide in isopropanol to form graphene oxide suspension; and b, preparing the titanium dioxide nanosheet coated graphene material: adding a certain amount of diethylenetriamine into the graphene oxide suspension, uniformly stirring, adding butyl titanate, uniformly stirring, putting in a closed reaction kettle to perform solvothermal reaction, washing a solvothermal reaction product by using ethanol, drying, and processing at high temperature under the protective atmosphere so as to obtain the titanium dioxide nanosheet coated graphene anode material. By means of the preparation method disclosed by the invention, aggregation and overlapping in the reducing process of graphene can be effectively prevented; therefore, the electronic conductivity of the titanium dioxide nanosheet coated graphene anode material of the lithium ion battery is increased; and a research thought is provided for seeking the novel anode material of the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of electrochemical materials, and in particular relates to a preparation method of a titanium dioxide nanosheet-coated graphene negative electrode material for a lithium ion battery. Background technique [0002] Rechargeable lithium-ion batteries have been widely used in electronic devices and hybrid vehicles, but their performance still lags behind the requirements for them in emerging fields. Advanced lithium-ion electrode materials must have high specific capacity, high safety and long cycle life. These are the basic requirements for high-performance lithium-ion batteries. Titanium dioxide has a high theoretical capacity, and the volume expansion of titanium dioxide is very small (3-4%) during the lithium intercalation / delithiation process, so titanium dioxide is a potential lithium-ion battery negative electrode material. However, titanium dioxide has poor electrical conductivity, slow diffusion rate of lithium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/362H01M4/483H01M4/625H01M10/0525H01M2004/021H01M2004/027H01M2220/20H01M2220/30Y02E60/10
Inventor 周训富袁杰林赵付双常嵩宋晓娜邓耀明屈德扬夏南南
Owner MCNAIR TECH
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