Preparation method of nitrogen-doped, boron-doped or phosphorus-doped graphitized carbon nitride material

A graphitization and carbon nitride technology, applied in active material electrodes, non-aqueous electrolyte battery electrodes, electrical components, etc., to achieve the effect of simple and easy preparation method, good electrical conductivity, and reduction of internal charge transfer resistance

Inactive Publication Date: 2020-10-02
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of the shuttle effect in lithium-sulfur batteries, and to provide a method for preparing nitrogen-doped, boron-doped or phosphorus-doped graphitized carbon nitride materials, which is between the sulfur positive electrode and the diaphragm Embedding composite membranes to block the shuttle effect of polysulfide anions through physical and chemical adsorption, thereby improving the cycle performance of lithium-sulfur batteries

Method used

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  • Preparation method of nitrogen-doped, boron-doped or phosphorus-doped graphitized carbon nitride material
  • Preparation method of nitrogen-doped, boron-doped or phosphorus-doped graphitized carbon nitride material
  • Preparation method of nitrogen-doped, boron-doped or phosphorus-doped graphitized carbon nitride material

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specific Embodiment approach 1

[0028] Specific implementation mode 1: This implementation mode records a method for preparing a nitrogen-doped graphitized carbon nitride material, and the method is specifically:

[0029] Take 5g ~ 10g of dicyandiamide and grind it fully in a mortar, then transfer it to a corundum crucible, cover the crucible with a lid to leave a hole of 1 / 8-1 / 7 lid length, put it into a muffle furnace at 300 ~ 400 Calcining at ℃ for 2h, then raising the temperature to 450-550℃ for 2h, the heating rate is 5℃min -1 , that is, a yellow powder is obtained, which is a nitrogen-doped graphitized carbon nitride material (g-C 3 N 4 ). g-C 3 N 4 The material contains a relatively high content of pyridine nitrogen, which can form a strong chemical bond with lithium polysulfide.

specific Embodiment approach 2

[0030] Embodiment 2: A method for preparing a conductive composite film using the nitrogen-doped graphitized carbon nitride material prepared in Embodiment 1. The method specifically includes: weighing nitrogen according to a mass ratio of 4:2:4 Doped graphitized carbon nitride material (g-C 3 N 4), conductive carbon black (BP2000) and PTFE emulsion (60wt.%), mix the three evenly (first put the nitrogen-doped graphitized carbon nitride material into a mortar and grind it fully, and then add conductive carbon black ( BP2000) to grind evenly, and finally add PTFE emulsion), and add 2~5mL deionized water to mix evenly, fully grind for 20min, remove water, roll press, die cut, dry, and control the thickness to 30~60mm. Specifically, put it into a blast oven to dry until there is no moisture on the surface, then transfer it to a small roller press for rolling into a film, and finally punch it into a pole piece with a diameter of 16mm, and dry it in vacuum at 60°C for 24h. Use a m...

specific Embodiment approach 3

[0031] Specific embodiment three: the application of the conductive composite film prepared in specific embodiment two in lithium-sulfur batteries, the conductive composite film is embedded between the sulfur positive electrode and the separator, which can effectively block the soluble polysulfide from the lithium negative electrode diffusion and migration. in figure 1 From top to bottom, respectively represent the lithium anode, the separator, the g-C 3 N 4 The composite membrane intercalation and the battery structure of the composite sulfur cathode.

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Abstract

The invention discloses a preparation method of a nitrogen-doped, boron-doped or phosphorus-doped graphitized carbon nitride material, and belongs to the technical field of lithium-sulfur batteries. In order to solve the problem that a shuttle effect exists in a lithium-sulfur battery, the method is characterized by fully grinding dicyandiamide and then transferring into a corundum crucible, wherein pores are reserved in the crucible; calcining for 2h at the temperature of 300-400 DEG C, then increasing the temperature to 450-550 DEG C to calcine for 2h so as to obtain the nitrogen-doped graphitized carbon nitride material; uniformly mixing the conductive carbon black and PTFE emulsion, adding deionized water, uniformly mixing, fully grinding for 20 minutes, removing moisture, rolling, punching, drying, and embedding a prepared conductive composite membrane between a sulfur positive electrode and a diaphragm. The preparation method disclosed by the invention is simple and easy to implement, the prepared composite membrane intercalation has good electrical conductivity and does not cause negative effects on the sulfur positive electrode, and the composite membrane intercalation is embedded between the sulfur positive electrode and the diaphragm to block the shuttling effect of polysulfide anions through physical and chemical adsorption, so that the cycle performance of the lithium-sulfur battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a method for preparing a nitrogen-doped, boron-doped or phosphorus-doped graphitized carbon nitride material. Background technique [0002] With the rapid development of the electric vehicle industry and portable electronic devices, energy storage systems with high energy density have received more and more attention and demand. Compared with traditional lithium-ion batteries, lithium-sulfur batteries have a higher theoretical capacity (1675mAh g -1 ) and theoretical energy density (2600Wh kg -1 ), and the sulfur element also has the advantages of low toxicity, rich natural content, and low cost, so it is considered to be a new generation of batteries that are widely favored besides lithium batteries. However, the commercialization of lithium-sulfur batteries still faces great challenges, such as the low conductivity of elemental sulfur and its disc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/052
CPCH01M4/13H01M4/625H01M4/628H01M10/052H01M2004/028Y02E60/10
Inventor 尹苗苗杨成徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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