Red phosphorus/nitrogen-doped graphene composite negative electrode material, method for preparing same and application of red phosphorus/nitrogen-doped graphene composite negative electrode material

A nitrogen-doped graphene, negative electrode material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of large volume change, low electronic conductivity, low specific capacity, etc., to increase the contact area, High mechanical properties and the effect of improving electrical conductivity

Active Publication Date: 2018-08-07
咸阳瞪羚谷新材料科技有限公司
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Problems solved by technology

However, red phosphorus has a large volume change during cycling and a low electronic conductivity (10 -14 S/cm) leads to a low act

Method used

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  • Red phosphorus/nitrogen-doped graphene composite negative electrode material, method for preparing same and application of red phosphorus/nitrogen-doped graphene composite negative electrode material
  • Red phosphorus/nitrogen-doped graphene composite negative electrode material, method for preparing same and application of red phosphorus/nitrogen-doped graphene composite negative electrode material
  • Red phosphorus/nitrogen-doped graphene composite negative electrode material, method for preparing same and application of red phosphorus/nitrogen-doped graphene composite negative electrode material

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preparation example Construction

[0025] The preparation method of the present invention comprises the following steps:

[0026] (1) Mix GO (graphene oxide) solution with cyanamide solution, heat at 60-80°C for 1-4 hours under stirring, then evaporate the water to obtain dark gray GO-cyanamide powder, mix GO- The cyanamide powder is put into a tube furnace, heated to 800-1000°C for 0.5-5h after feeding nitrogen gas, and nitrogen-doped graphene is obtained, wherein the mass ratio of GO and cyanamide is (1-2):( 1~50), make nitrogen-doped graphene.

[0027] (2) Mix a certain amount of nitrogen-doped graphene and red phosphorus evenly, put them into a ball mill jar, pass in argon protective gas, and then perform ball milling for 2 to 40 hours to prepare a red phosphorus / nitrogen-doped graphene composite negative electrode Material. The mass ratio of nitrogen-doped graphene to red phosphorus is (2-4): (8-6).

[0028] The present invention also provides a potassium ion battery, which is composed of a negative ele...

Embodiment 1

[0031] The GO solution was mixed with the cyanamide solution, heated at 70 °C for 2 hours under stirring, and then the water was evaporated to obtain dark gray GO-cyanamide powder, which was put into a tube furnace and passed into After nitrogen, the temperature was raised to 900°C and heated for 2 hours to prepare nitrogen-doped graphene, wherein the mass ratio of graphene oxide and cyanamide was 1:1; After the mass ratio is mixed evenly, it is put into a ball mill jar, and ball milled for 40 hours to obtain a red phosphorus / nitrogen-doped graphene composite negative electrode material.

[0032] figure 1 The scanning electron microscope picture of the nitrogen-doped graphene prepared for this embodiment, from figure 1 As can be seen in , nitrogen-doped graphene is gauze-like, with sheets folded over each other and curled at the edges.

[0033] figure 2 The XRD figure of the red phosphorus / nitrogen-doped graphene composite material prepared for the present embodiment, from...

Embodiment 2

[0037] The GO solution was mixed with the cyanamide solution, heated at 60 °C for 1 hour under stirring, and then the water was evaporated to obtain dark gray GO-cyanamide powder, which was put into a tube furnace and passed into After nitrogen, the temperature was raised to 800 °C and heated for 5 hours to prepare nitrogen-doped graphene, wherein the mass ratio of graphene oxide and cyanamide was 1:50; the prepared nitrogen-doped graphene and red phosphorus were mixed in a ratio of 4:6 After the mass ratio is mixed evenly, it is put into a ball mill jar and ball milled for 20 hours to obtain a red phosphorus / nitrogen-doped graphene composite negative electrode material with an average particle size of about 60 nanometers.

[0038] The prepared red phosphorus and nitrogen-doped graphene were mixed with a conductive agent and a binder to make a slurry, and then coated on a copper foil. After vacuum drying and cutting, a phosphorus-carbon electrode was prepared. The phosphorus-ca...

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Abstract

The invention relates to a red phosphorus/nitrogen-doped graphene composite negative electrode material, a method for preparing the same and application of the red phosphorus/nitrogen-doped graphene composite negative electrode material. The method includes uniformly mixing nitrogen-doped graphene and red phosphorus with each other according to a mass ratio of (2-4): (8-6) to obtain mixtures; carrying out ball-milling on the obtained mixtures in protective atmosphere to obtain the red phosphorus/nitrogen-doped graphene composite negative electrode material. The red phosphorus/nitrogen-doped graphene composite negative electrode material, the method and the application have the advantages that nitrogen-doped graphene materials with good electronic conductivity are used as substrate materials, ball-milling is carried out on the nitrogen-doped graphene materials and the red phosphorus, accordingly, insulation red phosphorus particles can be effectively dispersed in the conductive nitrogen-doped graphene materials in ball-milling procedures, the red phosphorus/nitrogen-doped graphene composite negative electrode material which is a composition has large specific surface areas, the integral conductivity can be improved, the contact areas between the red phosphorus/nitrogen-doped graphene composite negative electrode material and electrolyte solution can be increased, the problems ofstructural collapse and pulverization due to volumetric expansion of phosphorus-based material in potassium ion de-intercalation procedures can be solved, and the potassium ion diffusion speeds can be increased; the red phosphorus/nitrogen-doped graphene composite negative electrode material can be used as a negative electrode material for potassium ion batteries and is high in reversible capacity and excellent in rate capability and cycle stability.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a red phosphorus / nitrogen-doped graphene composite negative electrode material and its preparation method and application. Background technique [0002] In the 21st century, the most serious problems are energy and the environment. However, non-renewable energy sources can cause large-scale environmental pollution, as smoggy weather in many areas illustrates this situation. Therefore, it is particularly necessary to develop new types of renewable energy. In recent years, lithium-ion batteries are the most widely used in industrial production, but with the in-depth development of lithium-ion batteries, the shortage of lithium resources has become more and more serious. Lithium accounts for only 0.007% of the earth's crust and is a rare metal. Not only makes the cost of lithium-ion batteries remain high, but also limits the development and application of lithium-ion batteries in the long...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525H01M10/054
CPCH01M4/362H01M4/38H01M4/62H01M4/625H01M4/628H01M10/0525H01M10/054Y02E60/10
Inventor 宋江选焦星星
Owner 咸阳瞪羚谷新材料科技有限公司
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