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Graphene coated p@sno 2 Core-shell quantum dot electrode material and its preparation method and application

A core-shell quantum dot and graphene-coated technology, which is applied in the field of nanomaterials and electrochemistry, can solve the problems of low lithium ion conductivity and damage cycle performance, achieve good cycle stability, reduce diffusion paths, and ensure stability sexual effect

Active Publication Date: 2017-08-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, SnO 2 Due to the low conductivity of lithium ions, there will be volume expansion during charging and discharging, which will cause damage to the junction and result in poor cycle performance, which limits its application.

Method used

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  • Graphene coated p@sno <sub>2</sub> Core-shell quantum dot electrode material and its preparation method and application
  • Graphene coated p@sno <sub>2</sub> Core-shell quantum dot electrode material and its preparation method and application
  • Graphene coated p@sno <sub>2</sub> Core-shell quantum dot electrode material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Graphene-coated P@SnO 2 The preparation method of core-shell quantum dot electrode material, it comprises the steps:

[0028] 1) Prepare graphene (GO, ~2mg / mL) by the Hummer method;

[0029] 2) Add 0.379g of anhydrous stannous chloride to ethanolamine and stir to dissolve to obtain a solution; then sequentially add 0.0465g of red phosphorus and 5mL of graphene to obtain a black solution in an ultrasonic machine with a power of 80Hz for 1h;

[0030] 3) Transfer the black solution to the reaction kettle and heat it in an oven at 200°C for 12 hours, wash it with alcohol for 5 times after cooling, and dry the final graphene-coated P@SnO 2 Core-shell quantum dot electrode materials.

[0031] as attached figure 1 The shown TEM image shows amorphous P-coated SnO 2 The quantum dots become a core-shell structure, these quantum dots are evenly distributed on the graphene, and the size of the core-shell structure is 2-10nm;

[0032] Coated P@SnO with graphene in this example ...

Embodiment 2

[0037] 1) Prepare graphene (GO, ~2mg / mL) by the Hummer method;

[0038] 2) Add 0.379g of anhydrous stannous chloride to ethanolamine and stir to dissolve to obtain a solution; then sequentially add 0.0465g of red phosphorus and 5mL of graphene to obtain a black solution in an ultrasonic machine with a power of 80Hz for 1h;

[0039] 3) Transfer the black solution to the reactor and heat it in an oven at 200°C for 6 hours, wash it with alcohol for 5 times after cooling, and dry the final graphene-coated P@SnO 2 Core-shell quantum dot negative electrode material.

[0040] Coating P@SnO with the graphene obtained in this example 2Core-shell quantum dots as an example, at a current density of 1000mAh / g, graphene-coated P@SnO 2 The second discharge specific capacity of the core-shell quantum dots can reach 399mAh / g, after 700 cycles the discharge specific capacity is 300mAh / g, and the capacity retention rate is 75.1%.

Embodiment 3

[0042] 1) Prepare graphene (GO, ~2mg / mL) by the Hummer method;

[0043] 2) Add 0.379g of anhydrous stannous chloride to ethanolamine and stir to dissolve to obtain a solution; then sequentially add 0.0465g of red phosphorus and 2mL of graphene to obtain a black solution in an ultrasonic machine with a power of 80Hz for 1h;

[0044] 3) Transfer the black solution to the reaction kettle and heat it in an oven at 200°C for 12 hours, wash it with alcohol for 5 times after cooling, and dry the final graphene-coated P@SnO 2 Core-shell quantum dot electrode materials.

[0045] Coating P@SnO with the graphene obtained in this example 2 Core-shell quantum dots as an example, at a current density of 1000mAh / g, graphene-coated P@SnO 2 The second discharge specific capacity of the core-shell quantum dots can reach 405mAh / g, after 700 cycles the discharge specific capacity is 280mAh / g, and the capacity retention rate is 69.1%.

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Abstract

The invention relates to a graphene-coated P@SnO2 core-shell quantum dot electrode material and a preparation method and an application thereof. The method comprises the following steps: (1) preparing graphene through a Hummer method; (2) adding anhydrous stannous chloride to ethanolamine, stirring and dissolving the anhydrous stannous chloride to obtain a solution, then sequentially adding red phosphorus and graphene and carrying out ultrasonic mixing to obtain a black solution; and (3) transferring the black solution into a reaction kettle for hydrothermal reaction in an oven, cooling and washing the black solution with ethyl alcohol, and drying the black solution to obtain the electrode material finally. The graphene-coated P@SnO2 core-shell quantum dot electrode material has the beneficial effects that the ion / electron transport capacity of the material is improved; the diffusion path of the material is lowered; the cycling stability of the electrode material is effectively improved; the graphene-coated P@SnO2 core-shell quantum dot anode material is prepared through a hydrothermal method; and the graphene-coated P@SnO2 core-shell quantum dot anode material demonstrates the characteristics of high discharge capacity, high power and good cycling stability when taken as an anode active material of a lithium-ion battery, is high in feasibility and easy to amplify, and conforms to the characteristics of green chemistry.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, in particular to graphene-coated P@SnO 2 Core-shell quantum dot electrode material and its preparation method and application. Background technique [0002] Today, out of consideration for environmental protection, the country is vigorously developing pure electric vehicles and hybrid vehicles. The development of these electric vehicles has put forward new requirements for power lithium-ion batteries, which need to have the characteristics of high capacity, high power, long cycle life and low cost. The traditional carbon-based anode material graphite has a low capacity (theoretical capacity is 372mA h g -1 ). However, while SnO 2 As an anode material for lithium-ion batteries, it has a higher theoretical capacity than graphite currently used, and it has great potential as an anode material for lithium-ion batteries. However, SnO 2 Due to the low conductivity of li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/625H01M10/0525Y02E60/10
Inventor 麦立强余若瀚夏睿张磊
Owner WUHAN UNIV OF TECH
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