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c 2 n/porous graphene composite material, preparation method thereof, and diaphragm comprising the same

A technology of porous graphene and composite materials, applied in the field of lithium-sulfur batteries, can solve the problems of poor cycle performance, inability to effectively suppress the shuttle effect, low energy density of lithium-sulfur batteries, etc. The effect of conductivity

Active Publication Date: 2022-02-15
INST OF FLEXIBLE ELECTRONICS TECH OF THU ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commercial PP separators, due to their large pore size, allow polysulfides to pass through relatively easily, so they cannot effectively suppress the shuttle effect, resulting in problems such as low actual energy density and poor cycle performance of lithium-sulfur batteries.

Method used

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  • c <sub>2</sub> n/porous graphene composite material, preparation method thereof, and diaphragm comprising the same
  • c <sub>2</sub> n/porous graphene composite material, preparation method thereof, and diaphragm comprising the same
  • c <sub>2</sub> n/porous graphene composite material, preparation method thereof, and diaphragm comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 Preparation C 2 N / porous graphene composites

[0044] In the first step, graphene oxide was oxidized by hydrogen peroxide to form pores, and 5 mL of 30% hydrogen peroxide (H 2 o 2 ) solution was dropped into 50 mL graphene oxide (GO) aqueous solution (2 mg / mL), then heated at 95 °C for 4 h with continuous stirring, cooled to room temperature, and the product was collected by centrifugation at a speed of 10000 r / min , washed with deionized water to remove residual H 2 o 2 , and finally redispersed in deionized water to obtain a 2 mg / mL porous graphene oxide (HGO) suspension, and then freeze-dried to obtain a porous graphene oxide (HGO) aerogel.

[0045] In the second step, 100 mg of HGO was weighed, added to 100 mL of deoxygenated NMP for ultrasonic dispersion for 4 h, poured into a three-necked flask under a nitrogen atmosphere, and placed in an ice-water bath. 300 mg of hexaaminobenzene (HAB) was dissolved in 30 mL of deoxygenated N-methylpyrrolidone (NM...

Embodiment 2

[0048] Example 2 Preparation of diaphragm

[0049] With the C that embodiment 1 makes 2 N-HG was ultrasonically dispersed in ethanol solution, ultrasonicated for 1 h, and prepared into a uniform dispersion with a concentration of 0.1 mg / mL. Using a glass sand core funnel, the C 2 N-HG was suction-filtered on a PP membrane, then dried naturally, and then dried under reduced pressure at room temperature to obtain single-sided modified C 2 N / porous graphene modified PP separator, C 2 The loading capacity of N / porous graphene is 0.05mg / cm 2 , denoted as C 2 N-HG-P-0.05.

[0050] C prepared in this example 2 See the SEM picture of N-HG-PP-0.05 image 3 .

[0051] Adopt the C that this embodiment makes 2 The performance diagram of the lithium-sulfur battery made of N-HG-PP-0.05 separator cycled at 1 C rate for 300 cycles is shown in Figure 4 .

Embodiment 3

[0053] The same as the method of Example 2, the difference is that the obtained single-sided modified C 2 C in N / porous graphene modified PP separator 2 The loading of N / porous graphene is 0.1 mg / cm 2 , denoted as C 2 N-HG-P-0.1.

[0054] C prepared in this example 2 See the SEM picture of N-HG-PP-0.1 image 3 .

[0055] Adopt the C that this embodiment makes 2 The performance diagram of the lithium-sulfur battery made of N-HG-PP-0.1 separator at 1 C rate for 300 cycles is shown in Figure 4 .

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Abstract

The invention discloses a C 2 N / porous graphene composite material, method for preparing same, and separator comprising same. C 2 The preparation method of N / porous graphene composite material comprises the following steps: a, making holes to graphene oxide, obtains porous graphene oxide airgel; b, the porous graphene oxide airgel that described step a makes, Hexaaminobenzene and cyclohexanone are mixed, heated and reacted to produce C 2 N / porous graphene composites. Wherein, the mass ratio of the porous graphene oxide airgel, hexaaminobenzene and cyclohexanone is 1:(2-5):(2-5). C prepared by the present invention 2 N / porous graphene composite materials can be used to modify the separator of lithium-sulfur batteries, effectively inhibit the shuttle effect, enable lithium-sulfur batteries to maintain high energy density, and improve the cycle performance of batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, in particular to a C 2 The N / porous graphene composite material and its preparation method further relate to a diaphragm comprising the composite material and its preparation method. Background technique [0002] With the rapid development of electric vehicles and electronic mobile devices, energy storage devices with higher energy density have become a research hotspot. Although the current specific energy of lithium-ion batteries has reached 250 Wh / kg, it is difficult to increase the specific energy due to the limitation of the specific capacity of the positive electrode material. At the same time, there is a huge security in increasing the specific energy by increasing the charging voltage Therefore, it is imminent to develop a new type of electrochemical energy storage system. Lithium-sulfur batteries are a new type of energy storage system that uses elemental sulfur or sul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/194C01B21/06H01M10/052H01M50/403H01M50/431
CPCC01B32/194C01B21/0605H01M50/431H01M50/403H01M10/052C01P2004/80C01B2204/22Y02E60/10
Inventor 陈鹏宋远强揭斌勇付际
Owner INST OF FLEXIBLE ELECTRONICS TECH OF THU ZHEJIANG
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